MNK / Mallinckrodt PLC - SEC Filings, Annual Report, Proxy Statement

Mallinckrodt PLC
US ˙ OTCPK ˙ US0G5890A102
THIS SYMBOL IS NO LONGER ACTIVE

Basic Stats
LEI 549300LMDE3RUP8Z3L60
CIK 1567892
SEC Filings
All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to Mallinckrodt PLC
SEC Filings (Chronological Order)
This page provides a complete, chronological list of SEC Filings, excluding ownership filings which we provide elsewhere.
August 25, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d)  of the Securities Exchange Act of 1934 August 19, 2025 Date of Report (Date of Earliest Event Reported) Mallinckrodt plc

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d)  of the Securities Exchange Act of 1934 August 19, 2025 Date of Report (Date of Earliest Event Reported) Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation) (Commission File Nu

August 20, 2025 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☒ Defi

August 14, 2025 S-8

As filed with the Securities and Exchange Commission on August 14, 2025

As filed with the Securities and Exchange Commission on August 14, 2025 Registration No.

August 14, 2025 EX-10.4

Mallinckrodt Pharmaceuticals 2025 Stock and Incentive Plan (“Plan”) Terms and Conditions Restricted Unit Award

Exhibit 10.4 [Director Form] Mallinckrodt Pharmaceuticals 2025 Stock and Incentive Plan (“Plan”) Terms and Conditions of Restricted Unit Award RESTRICTED UNIT AWARD (“Award”) granted on , 202 (the “Grant Date”). 1.            Grant of Restricted Units. Mallinckrodt plc (the “Company”) has granted you [] Restricted Units subject to the provisions of these Terms and Conditions and the Plan. The Comp

August 14, 2025 EX-FILING FEES

Table 1: Newly Registered Securities

Calculation of Filing Fee Tables S-8 Mallinckrodt plc Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee 1 Equity Ordinary Shares, $0.

August 14, 2025 EX-10.3

Mallinckrodt Pharmaceuticals 2025 Stock and Incentive Plan (“Plan”) Terms and Conditions Restricted Unit Award

Exhibit 10.3 [Employee and Executive Form] Mallinckrodt Pharmaceuticals 2025 Stock and Incentive Plan (“Plan”) Terms and Conditions of Restricted Unit Award RESTRICTED UNIT AWARD (“Award”) granted on , 202 (the “Grant Date”). 1.            Grant of Restricted Units. Mallinckrodt plc (the “Company”) has granted you [] Restricted Units subject to the provisions of these Terms and Conditions and the

August 14, 2025 EX-10.2

Mallinckrodt Pharmaceuticals 2025 Stock and Incentive Plan (“Plan”) Terms and Conditions Restricted Unit Award

Exhibit 10.2 [CEO Inducement Grant] Mallinckrodt Pharmaceuticals 2025 Stock and Incentive Plan (“Plan”) Terms and Conditions of Restricted Unit Award RESTRICTED UNIT AWARD (“Award”) granted on August , 2025 (the “Grant Date”). 1.            Grant of Restricted Units. Mallinckrodt plc (the “Company”) has granted you [] Restricted Units subject to the provisions of these Terms and Conditions and the

August 14, 2025 EX-4.3

MALLINCKRODT PHARMACEUTICALS 2025 STOCK AND INCENTIVE PLAN Effective August 13, 2025 Article I PURPOSE

Exhibit 4.3 MALLINCKRODT PHARMACEUTICALS 2025 STOCK AND INCENTIVE PLAN Effective August 13, 2025 Article I PURPOSE 1.1            Purpose. The purposes of this Plan are to promote the interests of the Company by (i) aiding in the recruitment and retention of Directors, Employees and Consultants, (ii) providing incentives to Directors, Employees and Consultants by means of performance-related incen

August 14, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d)  of the Securities Exchange Act of 1934 August 13, 2025 Date of Report (Date of Earliest Event Reported) Mallinckrodt plc

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d)  of the Securities Exchange Act of 1934 August 13, 2025 Date of Report (Date of Earliest Event Reported) Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation) (Commission File Nu

August 6, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d)  of the Securities Exchange Act of 1934 July 31, 2025 Date of Report (Date of Earliest Event Reported) Mallinckrodt plc (E

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d)  of the Securities Exchange Act of 1934 July 31, 2025 Date of Report (Date of Earliest Event Reported) Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation) (Commission File Numb

August 6, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 6, 2025 Mallinckrodt plc (

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 6, 2025 Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation) (Commission File Num

August 6, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 27, 2025

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 27, 2025 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-35803 Mallinckrodt plc (Exa

August 6, 2025 S-8 POS

As filed with the Securities and Exchange Commission on August 6, 2025

As filed with the Securities and Exchange Commission on August 6, 2025 Registration No.

August 6, 2025 EX-10.2

Form of Deed of Indemnification Agreement by and between Mallinckrodt plc and Officers.

Exhibit 10.2 MNK PLC FORM FOR MALLINCKRODT PLC OFFICERS DEED OF INDEMNIFICATION THIS DEED OF INDEMNIFICATION (this “Agreement”), dated as of , 20, is made by and between Mallinckrodt plc, a public limited company incorporated in Ireland, and (“Indemnitee”). WHEREAS, it is essential to Mallinckrodt plc to retain and attract as personnel the most capable persons available; WHEREAS, Indemnitee is an

August 6, 2025 EX-10.2

Amendment No. 1 to Form of Second Amended and Restated Restricted Unit Award for Directors under the Mallinckrodt Pharmaceuticals 2024 Stock and Incentive Plan.

Exhibit 10.2 [Director Form] Mallinckrodt Pharmaceuticals 2024 Stock and Incentive Plan (“Plan”) TERMS AND CONDITIONS OF Second Amended and Restated RESTRICTED UNIT AWARD AMENDMENT #1 RESTRICTED UNIT AWARD (“Award”) granted on February 19, 2024 (the “Grant Date”) as amended and restated as of August 5, 2024, and as further amended and restated as of December 2, 2024, is hereby further amended as o

August 6, 2025 EX-24.1

Power of Attorney.*

Exhibit 24.1 POWER OF ATTORNEY KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below hereby constitutes and appoints Mark Tyndall as his or her true and lawful attorney-in-fact and agent with full power of substitution, for him or her in any and all capacities, to sign (i) one or more Registration Statements including on Form S-8 (and any and all amendments thereto, in

August 6, 2025 EX-99.3

Exhibit 99.3 Management’s Discussion and Analysis of Financial Condition and Results of Operations The following Management’s Discussion and Analysis of Financial Condition and Results of Operations describes the principal factors affecting our finan

endo993 Exhibit 99.3 Management’s Discussion and Analysis of Financial Condition and Results of Operations The following Management’s Discussion and Analysis of Financial Condition and Results of Operations describes the principal factors affecting our financial condition at June 30, 2025 and results of operations for the Successor three and six months ended June 30, 2025 and 2024, the Predecessor

August 6, 2025 EX-10.1

Amendment No. 1 to Form of Second Amended and Restated Restricted Unit Award for Executive Officers under the Mallinckrodt Pharmaceuticals 2024 Stock and Incentive Plan.

Exhibit 10.1 [EC other than CEO Form] Mallinckrodt Pharmaceuticals 2024 Stock and Incentive Plan (“Plan”) TERMS AND CONDITIONS OF Second Amended and Restated RESTRICTED UNIT AWARD AMENDMENT #1 RESTRICTED UNIT AWARD (“Award”) granted on February 2, 2024 (the “Grant Date”), as amended and restated as of August 5, 2024, and as further amended and restated as of December 2, 2024, is hereby further ame

August 6, 2025 EX-99.1

Mallinckrodt plc Reports Financial Results for Second Quarter 2025 and Provides Guidance Legacy Mallinckrodt Second Quarter 2025 Results Delivers Second Quarter Net Sales of $485.1 Million, Reflecting a 5.7% Year-Over-Year Decrease on a Reported Basi

Exhibit 99.1 Mallinckrodt plc Reports Financial Results for Second Quarter 2025 and Provides Guidance Legacy Mallinckrodt Second Quarter 2025 Results Delivers Second Quarter Net Sales of $485.1 Million, Reflecting a 5.7% Year-Over-Year Decrease on a Reported Basis; Excluding Impact of Therakos® Divestiture, Net Sales Grew 8.5% Reports Net Income of $2.4 Million and Adjusted EBITDA of $137.2 Millio

August 6, 2025 EX-99.2

Exhibit 99.2 ENDO, INC. INDEX Condensed Consolidated Balance Sheets as of June 30, 2025 (Successor) and December 31, 2024 (Successor) (Unaudited) 2 Condensed Consolidated Statements of Operations for the three and six months ended June 30, 2025 (Succ

endo992 Exhibit 99.2 ENDO, INC. INDEX Condensed Consolidated Balance Sheets as of June 30, 2025 (Successor) and December 31, 2024 (Successor) (Unaudited) 2 Condensed Consolidated Statements of Operations for the three and six months ended June 30, 2025 (Successor), the three and six months ended June 30, 2024 (Successor), the period April 1, 2024 to April 23, 2024 (Predecessor) and the period Janu

August 6, 2025 EX-10.1

Employment Agreement, by and between ST Shared Services LLC and Christiana Stamoulis, dated as of August 1, 2025.

Exhibit 10.1 EMPLOYMENT AGREEMENT This EMPLOYMENT AGREEMENT (this “Agreement”) is entered into on August 1, 2025 (the “Effective Date”) by and between ST Shared Services LLC, a Delaware limited liability company, or any successor thereto (the “Company”), and Christiana Stamoulis (the “Executive”) (collectively referred to as “Parties” or individually referred to as a “Party”). WHEREAS, the Company

August 1, 2025 EX-99.3

Par Health Deal - basis financial information presentation

Exhibit 99.3 Par Health Deal - basis financial information presentation Table of contents 2 July 2025 | Par Health Page 2 Summary of findings Business overview Quality of earnings Recast income statement Working capital Appendix 1 2 3 4 5 6 3 10 16 48 69 78 Summary of findings Standalone and synergies Diligence adjusted gross profit Diligence adjusted net sales Diligence EBITDA $(35.0)m $728.5m $1

August 1, 2025 EX-10.1

Credit Agreement, dated as of July 31, 2025, by and among ST 2020, Inc., as Parent, MEH, Inc., as Borrower, the lenders named therein and Wilmington Savings Fund Society, FSB, as Administrative Agent and Collateral Agent.

  Exhibit 10.1   EXECUTION VERSION   $1,350,000,000    CREDIT AGREEMENT   Dated as of July 31, 2025   among   MEH, INC., as the Borrower,   ST 2020, INC., as the Parent,   WILMINGTON SAVINGS FUND SOCIETY, FSB, as Administrative Agent,   WILMINGTON SAVINGS FUND SOCIETY, FSB, as Collateral Agent,   THE LENDERS PARTY HERETO,   GOLDMAN SACHS BANK USA, as Arranger and Bookrunner,   and   OPY CREDIT COR

August 1, 2025 EX-10.1

Form of Deed of Indemnification by and between Mallinckrodt plc and Directors and Secretary.

Exhibit 10.1   PLC FORM FOR MALLINCKRODT PLC DIRECTORS/SECRETARY   DEED OF INDEMNIFICATION   THIS DEED OF INDEMNIFICATION (this “Agreement”), dated as of , 20, is made by and between Mallinckrodt plc, a public limited company incorporated in Ireland, and (“Indemnitee”).   WHEREAS, it is essential to Mallinckrodt plc to retain and attract as directors and secretary the most capable persons availabl

August 1, 2025 EX-10.2

Form of Indemnification Agreement by and between Sucampo Pharmaceuticals LLC and Directors and Secretary.

Exhibit 10.2   SUCAMPO FORM FOR MALLINCKRODT PLC DIRECTORS/SECRETARY   INDEMNIFICATION AGREEMENT   THIS INDEMNIFICATION AGREEMENT (this “Agreement”), dated as of , 20, is made by and between Sucampo Pharmaceuticals LLC, a Delaware limited liability company (“Sucampo”), and (“Indemnitee”).   WHEREAS, Sucampo is a wholly owned subsidiary of Mallinckrodt plc, a public limited company incorporated in

August 1, 2025 EX-99.5

AMENDED AND RESTATED REGISTRATION RIGHTS AGREEMENT

Exhibit 99.5 EXECUTION VERSION AMENDED AND RESTATED REGISTRATION RIGHTS AGREEMENT This Amended and Restated Registration Rights Agreement (including all exhibits hereto and as may be amended, supplemented or restated from time to time in accordance with the terms hereof, this “Agreement”) is made and entered into as of the Effective Date, by and among Mallinckrodt plc, an Irish public limited comp

August 1, 2025 EX-99.4

Certain Preliminary Financial Information

Exhibit 99.4 Certain Preliminary Financial Information The following preliminary financial information for the 2nd quarter of fiscal year 2025 was provided to certain shareholders on July 10, 2025. · Consolidated Revenue is favorable to the model with all segments above or at forecast · Consolidated PF Adj. EBITDA is ~$5-6mm off model forecast with favorability from MNK Gx being offset by Endo Si

August 1, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d)  of the Securities Exchange Act of 1934 July 31, 2025 Date of Report (Date of Earliest Event Reported) Mallinckrodt plc (E

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d)  of the Securities Exchange Act of 1934 July 31, 2025 Date of Report (Date of Earliest Event Reported) Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation) (Commission File Numb

August 1, 2025 EX-3.1

Amended and Restated Memorandum and Articles of Association of Mallinckrodt plc.

Exhibit 3.1 Companies Act 2014 A PUBLIC COMPANY LIMITED BY SHARES MEMORANDUM and ARTICLES OF ASSOCIATION of MALLINCKRODT PUBLIC LIMITED COMPANY (as amended by Special Resolution passed on 13 June 2025 with effect from 31 July 2025) DUBLIN Cert. No.: 522227 Companies Act 2014 A PUBLIC COMPANY LIMITED BY SHARES CONSTITUTION of MALLINCKRODT PUBLIC LIMITED COMPANY MEMORANDUM OF ASSOCIATION 1. The name

August 1, 2025 8-K/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A (Amendment No. 1) CURRENT REPORT Pursuant to Section 13 OR 15(d)  of the Securities Exchange Act of 1934 July 31, 2025 Date of Report (Date of Earliest Event Reported)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A (Amendment No. 1) CURRENT REPORT Pursuant to Section 13 OR 15(d)  of the Securities Exchange Act of 1934 July 31, 2025 Date of Report (Date of Earliest Event Reported) Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation) (

August 1, 2025 EX-99.2

Confidential and subject to change Par Health Confidential and subject to change Par Health Transaction Overview Confidential and subject to change Par Health Confidential and subject to change Transaction Summary Confidential and subject to change P

Exhibit 99.2 Confidential and subject to change Par Health Confidential and subject to change Par Health Transaction Overview Confidential and subject to change Par Health Confidential and subject to change Transaction Summary Confidential and subject to change Par Health 1. PF. Adj. EBITDA burdened by $35mm of forecasted annual net dissynergies Transaction Summary 1 Sources New $200mm Revolver $

August 1, 2025 EX-99.1

Mallinckrodt, Endo Complete Merger to Create Global, Scaled, Diversified Therapeutics Leader Highly Complementary Companies to Advance Therapies to Address Unmet Patient Needs Respective Generics Businesses and Endo’s Sterile Injectables Business to

Exhibit 99.1 Mallinckrodt, Endo Complete Merger to Create Global, Scaled, Diversified Therapeutics Leader Highly Complementary Companies to Advance Therapies to Address Unmet Patient Needs Respective Generics Businesses and Endo’s Sterile Injectables Business to be Combined and Spun Off as an Independent Company with Target Date in the Fourth Quarter of 2025 New York Stock Exchange (NYSE) Listing

July 31, 2025 PRE 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☒ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Defi

July 7, 2025 EX-10.1

Third Amended and Restated Employment Agreement, by and between ST Shared Services LLC and Sigurdur Olafsson, dated July 7, 2025.

Exhibit 10.1 THIRD AMENDED AND RESTATED EMPLOYMENT AGREEMENT This THIRD AMENDED AND RESTATED EMPLOYMENT AGREEMENT (this “Agreement”), is entered into on July 7, 2025 and shall be effective on the Effective Date, as defined below, by and between ST Shared Services LLC, a Delaware limited liability company, or any successor thereto (the “Company”), and Sigurdur Olafsson (the “Executive”). WHEREAS, t

July 7, 2025 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 7, 2025 Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation) (Commission File Numb

June 13, 2025 EX-99.1

Mallinckrodt and Endo Shareholders Approve Combination to Create a Global, Scaled, Diversified Pharmaceuticals Leader Mallinckrodt to Apply to Irish High Court for Approval of Scheme of Arrangement

Exhibit 99.1 Mallinckrodt and Endo Shareholders Approve Combination to Create a Global, Scaled, Diversified Pharmaceuticals Leader Mallinckrodt to Apply to Irish High Court for Approval of Scheme of Arrangement DUBLIN and MALVERN, Pa., June 13, 2025 /PRNewswire/ – Mallinckrodt plc (“Mallinckrodt”) and Endo, Inc. (OTCQX: NDOI) (“Endo”) today announced that their respective shareholders have provide

June 13, 2025 8-K

Financial Statements and Exhibits, Other Events, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d)  of the Securities Exchange Act of 1934 June 13, 2025 Date of Report (Date of Earliest Event Reported) Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation) (Commission File Numb

June 9, 2025 EX-99.1

Mallinckrodt, Endo Announce Planned Leadership Team for Merged Company Experienced and Highly Capable Senior Executives to Lead both the Branded Specialty Pharmaceutical and Generics & Sterile Injectables Businesses Generics & Sterile Injectables Spi

Exhibit 99.1 Mallinckrodt, Endo Announce Planned Leadership Team for Merged Company Experienced and Highly Capable Senior Executives to Lead both the Branded Specialty Pharmaceutical and Generics & Sterile Injectables Businesses Generics & Sterile Injectables Spin-Off to be Called Par Health DUBLIN and MALVERN, Pa., June 9, 2025 – Mallinckrodt plc (“Mallinckrodt”) and Endo, Inc. (OTCQX: NDOI) (“En

June 9, 2025 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d)  of the Securities Exchange Act of 1934 June 9, 2025 Date of Report (Date of Earliest Event Reported) Mallinckrodt plc (Ex

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d)  of the Securities Exchange Act of 1934 June 9, 2025 Date of Report (Date of Earliest Event Reported) Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation) (Commission File Numbe

June 9, 2025 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d)  of the Securities Exchange Act of 1934 June 9, 2025 Date of Report (Date of Earliest Event Reported) Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation) (Commission File Numbe

June 9, 2025 EX-99.1

Mallinckrodt, Endo Announce Planned Leadership Team for Merged Company Experienced and Highly Capable Senior Executives to Lead both the Branded Specialty Pharmaceutical and Generics & Sterile Injectables Businesses Generics & Sterile Injectables Spi

Exhibit 99.1 Mallinckrodt, Endo Announce Planned Leadership Team for Merged Company Experienced and Highly Capable Senior Executives to Lead both the Branded Specialty Pharmaceutical and Generics & Sterile Injectables Businesses Generics & Sterile Injectables Spin-Off to be Called Par Health DUBLIN and MALVERN, Pa., June 9, 2025 – Mallinckrodt plc (“Mallinckrodt”) and Endo, Inc. (OTCQX: NDOI) (“En

May 30, 2025 EX-1.01

Exhibit 1.01

Exhibit 1.01 Conflict Minerals Report Introduction Mallinckrodt plc is a global business consisting of multiple wholly owned subsidiaries (collectively, “Mallinckrodt” or “the Company”) that develops, manufactures, markets and distributes specialty pharmaceutical products and therapies. The Company’s Specialty Brands reportable segment’s areas of focus include autoimmune and rare diseases in speci

May 30, 2025 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 (State or other jurisdiction of incorporation) (Co

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 (State or other jurisdiction of incorporation) (Commission File Number) College Business & Technology Park, Cruiserath, Blanchardstown, Dublin 15, Ireland (Address of principal executive offices) (Zip

May 16, 2025 425

Filed by Mallinckrodt plc (Commission File No. 001-35803)

Filed by Mallinckrodt plc (Commission File No. 001-35803) Pursuant to Rule 425 of the Securities Act of 1933 and deemed filed Pursuant to Rule 14a-6(b) of the Securities Exchange Act of 1934 Form S-4 No. 333-286694 Subject Company: Endo, Inc. (Commission File No. 333-280767) P22993 - EPB ALL VOTES MATTER PLEASE VOTE FOR BOTH THE COURT MEETING AND THE EGM TODAY! GO VOTE BUSINESS COMBINATION WITH EN

May 16, 2025 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 15, 2025 Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation) (Commission File Numb

May 16, 2025 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 14, 2025 Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation) (Commission File Numb

May 13, 2025 425

Mallinckrodt and Endo Announce Significant Progress in Proposed Merger S-4 Registration Statement Effective; HSR Waiting Period Expired Irish High Court Approves Convening of Shareholder Meetings Shareholder Vote Scheduled for June 13

Filed by Mallinckrodt plc (Commission File No. 001-35803) Pursuant to Rule 425 of the Securities Act of 1933 and deemed filed Pursuant to Rule 14a-6(b) of the Securities Exchange Act of 1934 Form S-4 No. 333-286694 Subject Company: Endo, Inc. (Commission File No. 333-280767) Mallinckrodt and Endo Announce Significant Progress in Proposed Merger S-4 Registration Statement Effective; HSR Waiting Per

May 13, 2025 425

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Filed by Mallinckrodt plc (Commission File No. 001-35803) Pursuant to Rule 425 of the Securities Act of 1933 and deemed filed Pursuant to Rule 14a-6(b) of the Securities Exchange Act of 1934 Form S-4 No. 333-286694 Subject Company: Endo, Inc. (Commission File No. 333-280767) Dear Colleagues, I’m pleased to report today exciting news regarding our planned merger with Endo to create a global, scaled

May 12, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 28, 2025

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 28, 2025 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-35803 Mallinckrodt plc (Ex

May 12, 2025 424B3

Endo, Inc. 9 Great Valley Parkway Malvern, Pennsylvania 19355

TABLE OF CONTENTS  Filed Pursuant to Rule 424(b)(3)  Registration File No. 333-286694 Endo, Inc. 9 Great Valley Parkway Malvern, Pennsylvania 19355 May 12, 2025 Dear Endo Stockholder: You are cordially invited to attend a special meeting of the stockholders (the “Endo special meeting”) of Endo, Inc. (“Endo”), to be held on June 13, 2025 at 9.00 a.m., Eastern Time, at 9 Great Valley Parkway, Malver

May 9, 2025 425

Filed by Mallinckrodt plc (Commission File No. 001-35803)

Filed by Mallinckrodt plc (Commission File No. 001-35803) Pursuant to Rule 425 of the Securities Act of 1933 and deemed filed Pursuant to Rule 14a-6(b) of the Securities Exchange Act of 1934 Form S-4 No. 333-286694 Subject Company: Endo, Inc. (Commission File No. 333-280767) Mallinckrodt (Q1 2025) May 6, 2025 Corporate Speakers: · Siggi Olafsson; Mallinckrodt PLC; Chief Executive Officer · Bryan R

May 8, 2025 EX-99.1

Form of Proxy Card of Mallinckrodt, plc Court Meetings.**

Exhibit 99.1 Signature [PLEASE SIGN WITHIN BOX] Date Signature (Joint Owners) Date TO VOTE, MARK BLOCKS BELOW IN BLUE OR BLACK INK AS FOLLOWS: KEEP THIS PORTION FOR YOUR RECORDS DETACH AND RETURN THIS PORTION ONLY THIS PROXY CARD IS VALID ONLY WHEN SIGNED AND DATED. C/O MALLINCKRODT PLC COMPANY SECRETARY COLLEGE BUSINESS & TECHNOLOGY PARK CRUISERATH, BLANCHARDSTOWN DUBLIN 15, IRELAND VOTE BY INTER

May 8, 2025 EX-99.7

Consent of Goldman Sachs.**

Exhibit 99.7 200 West Street | New York, NY 10282-2198 Tel: 212-902-1000 | Fax: 212-902-3000 May 8, 2025 Board of Directors Endo, Inc. 1400 Atwater Drive Malvern, PA 19355 Re: Amendment No. 2 (the “Amendment”) to Registration Statement on Form S-4 of Mallinckrodt plc (File No. 333-286694) (the “Registration Statement”) Ladies and Gentlemen: Reference is made to our opinion letter, dated March 13,

May 8, 2025 S-4/A

As filed with the Securities and Exchange Commission on May 8, 2025

TABLE OF CONTENTS As filed with the Securities and Exchange Commission on May 8, 2025 Registration No.

May 8, 2025 EX-99.6

Consent of Lazard Frères & Co. LLC**

Exhibit 99.6 The Board of Directors Mallinckrodt plc College Business & Technology Park, Cruiserath Blanchardstown, Dublin 15, Ireland The Board of Directors: We hereby consent to the inclusion of our opinion letter, dated March 13, 2025, to the Board of Directors of Mallinckrodt plc (“Mallinckrodt”) as Annex F to, and reference thereto under the headings “SUMMARY — Opinion of Mallinckrodt’s Finan

May 8, 2025 CORRESP

[Letterhead of Mallinckrodt plc] May 8, 2025

[Letterhead of Mallinckrodt plc] May 8, 2025 VIA EDGAR Division of Corporation Finance Office of Life Sciences U.

May 8, 2025 EX-99.3

Form of Proxy Card of Endo, Inc.**

Exhibit 99.3 Signature [PLEASE SIGN WITHIN BOX] Date Signature (Joint Owners) Date TO VOTE, MARK BLOCKS BELOW IN BLUE OR BLACK INK AS FOLLOWS: KEEP THIS PORTION FOR YOUR RECORDS DETACH AND RETURN THIS PORTION ONLY THIS PROXY CARD IS VALID ONLY WHEN SIGNED AND DATED. V75347-Z90334 ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ENDO, INC. 9 GREAT VALLEY PARKWAY MALVERN, PA. 19355 ! ! ! ! ! ! ! ! ! ! ! ! 1. The

May 6, 2025 EX-99.1

Form of Proxy Card of Mallinckrodt, plc Court Meeting.**

Exhibit 99.1 Signature [PLEASE SIGN WITHIN BOX] Date Signature (Joint Owners) Date TO VOTE, MARK BLOCKS BELOW IN BLUE OR BLACK INK AS FOLLOWS: KEEP THIS PORTION FOR YOUR RECORDS DETACH AND RETURN THIS PORTION ONLY THIS PROXY CARD IS VALID ONLY WHEN SIGNED AND DATED. C/O MALLINCKRODT PLC COMPANY SECRETARY COLLEGE BUSINESS & TECHNOLOGY PARK CRUISERATH, BLANCHARDSTOWN DUBLIN 15, IRELAND VOTE BY INTER

May 6, 2025 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 6, 2025 Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation) (Commission File Number

May 6, 2025 EX-99.2

Form of Proxy Card of Mallinckrodt, plc Extraordinary General Meeting.*

Exhibit 99.2 Signature [PLEASE SIGN WITHIN BOX] Date Signature [PLEASE SIGN WITHIN BOX] Date TO VOTE, MARK BLOCKS BELOW IN BLUE OR BLACK INK AS FOLLOWS: The Board of Directors recommends you vote FOR each of the following proposals at the Extraordinary General Meeting: Extraordinary General Meeting Proxy Card Please date and sign name exactly as it appears hereon. Executors, administrators, truste

May 6, 2025 EX-99.1

Mallinckrodt plc Reports First Quarter 2025 Financial Results and Reaffirms Full-Year Guidance Delivers First Quarter Net Sales of $419.9 Million, Reflecting a 10%Year-Over-Year Decrease on a Reported Basis; Excluding Impact of Therakos® Divestiture,

Exhibit 99.1 Mallinckrodt plc Reports First Quarter 2025 Financial Results and Reaffirms Full-Year Guidance Delivers First Quarter Net Sales of $419.9 Million, Reflecting a 10%Year-Over-Year Decrease on a Reported Basis; Excluding Impact of Therakos® Divestiture, Net Sales Grew 2.5% Reports Net Loss of $27.7 Million and Adjusted EBITDA of $102.3 Million Acthar® Gel (repository corticotropin inject

May 6, 2025 EX-99.6

Consent of Lazard Frères & Co. LLC**

Exhibit 99.6 The Board of Directors Mallinckrodt plc College Business & Technology Park, Cruiserath Blanchardstown, Dublin 15, Ireland The Board of Directors: We hereby consent to the inclusion of our opinion letter, dated March 13, 2025, to the Board of Directors of Mallinckrodt plc (“Mallinckrodt”) as Annex F to, and reference thereto under the headings “SUMMARY — Opinion of Mallinckrodt’s Finan

May 6, 2025 EX-99.7

Consent of Goldman Sachs.**

Exhibit 99.7 200 West Street | New York, NY 10282-2198 Tel: 212-902-1000 | Fax: 212-902-3000 May 6, 2025 Board of Directors Endo, Inc. 1400 Atwater Drive Malvern, PA 19355 Re: Amendment No. 1 (the “Amendment”) to Registration Statement on Form S-4 of Mallinckrodt plc (File No. 333-286694) (the “Registration Statement”) Ladies and Gentlemen: Reference is made to our opinion letter, dated March 13,

May 6, 2025 EX-21.2

Subsidiaries of Endo, Inc.*

Exhibit 21.2 SUBSIDIARIES OF ENDO, INC. The following is a list of the subsidiaries of Endo, Inc. as of December 31, 2024. Subsidiary Jurisdiction of Incorporation or Organization Ownership by Endo, Inc. Endo Finance Holdings, Inc. Delaware Direct Endo Enterprise, Inc. Delaware Indirect Paladin Pharma Inc. Canada Indirect Endo USA, Inc. Delaware Indirect Endo US Holdings Luxembourg I S.a.r.l. Luxe

May 6, 2025 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 6, 2025 Mallinckrodt plc (Exa

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 6, 2025 Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation) (Commission File Number

May 6, 2025 EX-99.1

Mallinckrodt plc Reports First Quarter 2025 Financial Results and Reaffirms Full-Year Guidance Delivers First Quarter Net Sales of $419.9 Million, Reflecting a 10%Year-Over-Year Decrease on a Reported Basis; Excluding Impact of Therakos® Divestiture,

Exhibit 99.1 Mallinckrodt plc Reports First Quarter 2025 Financial Results and Reaffirms Full-Year Guidance Delivers First Quarter Net Sales of $419.9 Million, Reflecting a 10%Year-Over-Year Decrease on a Reported Basis; Excluding Impact of Therakos® Divestiture, Net Sales Grew 2.5% Reports Net Loss of $27.7 Million and Adjusted EBITDA of $102.3 Million Acthar® Gel (repository corticotropin inject

May 6, 2025 EX-99.10

Consent of Sophia Langlois.*

Exhibit 99.10 Consent of Prospective Director Pursuant to Rule 438 promulgated under the Securities Act of 1933, as amended, the undersigned hereby consents to being named in the Registration Statement on Form S-4 of Mallinckrodt plc (the “Registrant”), and all amendment or supplements thereto (the “Registration Statement”), as a person who is to become a director of the Registrant effective as of

May 6, 2025 EX-99.9

Consent of Scott Hirsch.*

Exhibit 99.9 Consent of Prospective Director Pursuant to Rule 438 promulgated under the Securities Act of 1933, as amended, the undersigned hereby consents to being named in the Registration Statement on Form S-4 of Mallinckrodt plc (the “Registrant”), and all amendment or supplements thereto (the “Registration Statement”), as a person who is to become a director of the Registrant effective as of

May 6, 2025 EX-99.11

Consent of Marc Yoskowitz.*

Exhibit 99.11 Consent of Prospective Director Pursuant to Rule 438 promulgated under the Securities Act of 1933, as amended, the undersigned hereby consents to being named in the Registration Statement on Form S-4 of Mallinckrodt plc (the “Registrant”), and all amendment or supplements thereto (the “Registration Statement”), as a person who is to become a director of the Registrant effective as of

May 6, 2025 S-4/A

As filed with the Securities and Exchange Commission on May 6, 2025

TABLE OF CONTENTS As filed with the Securities and Exchange Commission on May 6, 2025 Registration No.

May 6, 2025 EX-99.3

Form of Proxy Card of Endo, Inc.**

Exhibit 99.3 Signature [PLEASE SIGN WITHIN BOX] Date Signature (Joint Owners) Date TO VOTE, MARK BLOCKS BELOW IN BLUE OR BLACK INK AS FOLLOWS: KEEP THIS PORTION FOR YOUR RECORDS DETACH AND RETURN THIS PORTION ONLY THIS PROXY CARD IS VALID ONLY WHEN SIGNED AND DATED. V75347-Z90334 ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ENDO, INC. 9 GREAT VALLEY PARKWAY MALVERN, PA. 19355 ! ! ! ! ! ! ! ! ! ! ! ! 1. The

May 6, 2025 CORRESP

[Letterhead of Wachtell, Lipton, Rosen & Katz]

[Letterhead of Wachtell, Lipton, Rosen & Katz] May 6, 2025 VIA EDGAR Division of Corporation Finance Office of Life Sciences U.

April 23, 2025 EX-99.8

Consent of Paul S. Efron.*

Exhibit 99.8 Consent of Prospective Director Pursuant to Rule 438 promulgated under the Securities Act of 1933, as amended, the undersigned hereby consents to being named in the Registration Statement on Form S-4 of Mallinckrodt plc (the “Registrant”), and all amendment or supplements thereto (the “Registration Statement”), as a person who is to become a director of the Registrant effective as of

April 23, 2025 425

###

Filed by Mallinckrodt plc (Commission File No. 001-35803) Pursuant to Rule 425 of the Securities Act of 1933 and deemed filed Pursuant to Rule 14a-6(b) of the Securities Exchange Act of 1934 Form S-4 No. 333-286694 Subject Company: Endo, Inc. (Commission File No. 333-280767) Dear Colleagues, When we announced the exciting news last month of our planned merger with Endo, we committed to keeping the

April 23, 2025 EX-FILING FEES

Filing Fee Table*

Exhibit 107 Calculation of Filing Fee Tables Form S-4 (Form Type) Mallinckrodt plc (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title(1) Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Newly Registered Securities Fees to Be Paid Equity Ordinary shares, par value $0.

April 23, 2025 EX-99.7

Consent of Goldman Sachs.

Exhibit 99.7 200 West Street | New York, NY 10282-2198 Tel: 212-902-1000 | Fax: 212-902-3000 April 23, 2025 Board of Directors Endo, Inc. 1400 Atwater Drive Malvern, PA 19355 Re: Registration Statement on Form S-4 of Mallinckrodt plc, filed April 23, 2025 (the “Registration Statement”) Ladies and Gentlemen: Reference is made to our opinion letter, dated March 13, 2025 (“Opinion Letter”), with resp

April 23, 2025 S-4

As filed with the Securities and Exchange Commission on April 23, 2025

TABLE OF CONTENTS As filed with the Securities and Exchange Commission on April 23, 2025 Registration No.

April 23, 2025 EX-99.6

Consent of Lazard Frères & Co. LLC

Exhibit 99.6 The Board of Directors Mallinckrodt plc College Business & Technology Park, Cruiserath Blanchardstown, Dublin 15, Ireland The Board of Directors: We hereby consent to the inclusion of our opinion letter, dated March 13, 2025, to the Board of Directors of Mallinckrodt plc (“Mallinckrodt”) as Annex F to, and reference thereto under the headings “SUMMARY — Opinion of Mallinckrodt’s Finan

April 3, 2025 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

April 3, 2025 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

March 24, 2025 425

Filed by Mallinckrodt plc (Commission File No. 001-35803)

Filed by Mallinckrodt plc (Commission File No. 001-35803) Pursuant to Rule 425 of the Securities Act of 1933 and deemed filed Pursuant to Rule 14a-12 of the Securities Exchange Act of 1934 Subject Company: Endo, Inc. (Commission File No. 333-280767) Mallinckrodt(March 18 Town Hall) March 19, 2025* Corporate Speakers: · Joyce Pearl; Director Commercial Communications · Sigurdur Olafsson; Mallinckro

March 18, 2025 425

Filed by Mallinckrodt plc (Commission File No. 001-35803)

Filed by Mallinckrodt plc (Commission File No. 001-35803) Pursuant to Rule 425 of the Securities Act of 1933 and deemed filed Pursuant to Rule 14a-12 of the Securities Exchange Act of 1934 Subject Company: Endo, Inc. (Commission File No. 333-280767) Mallinckrodt (Town Hall) March 13, 2025* Corporate Speakers: · Sigurdur Olafsson; Mallinckrodt Pharmaceuticals; Chief Executive Officer, President PRE

March 18, 2025 425

Filed by Mallinckrodt plc (Commission File No. 001-35803)

Filed by Mallinckrodt plc (Commission File No. 001-35803) Pursuant to Rule 425 of the Securities Act of 1933 and deemed filed Pursuant to Rule 14a-12 of the Securities Exchange Act of 1934 Subject Company: Endo, Inc. (Commission File No. 333-280767) Dear Valued Mallinckrodt Partner, I am reaching out to share some exciting news regarding Mallinckrodt. We recently announced that we have agreed to c

March 14, 2025 425

Filed by Mallinckrodt plc (Commission File No. 001-35803)

Filed by Mallinckrodt plc (Commission File No. 001-35803) Pursuant to Rule 425 of the Securities Act of 1933 and deemed filed Pursuant to Rule 14a-12 of the Securities Exchange Act of 1934 Subject Company: Endo, Inc. (Commission File No. 333-280767) Mallinckrodt and Endo Q4 2024 Earnings and Joint Transaction Call Transcript March 13, 2025 Companies’ Participants: Laure E. Park - Senior Vice Presi

March 13, 2025 EX-99.1

Mallinckrodt plc Reports Fourth Quarter and Fiscal Year 2024 Financial Results and Provides 2025 Guidance Achieved High End of Full-Year Net Sales Guidance Range and Midpoint of Adjusted EBITDA Guidance Range Grew Full-Year Net Sales by 6.1% to $2.0

Exhibit 99.1 Mallinckrodt plc Reports Fourth Quarter and Fiscal Year 2024 Financial Results and Provides 2025 Guidance Achieved High End of Full-Year Net Sales Guidance Range and Midpoint of Adjusted EBITDA Guidance Range Grew Full-Year Net Sales by 6.1% to $2.0 Billion, with 14.2% Growth in Acthar® Gel (repository corticotropin injection) and 15.4% Growth in Specialty Generics; Reduced Total Debt

March 13, 2025 425

Filed by Mallinckrodt plc (Commission File No. 001-35803)

Filed by Mallinckrodt plc (Commission File No. 001-35803) Pursuant to Rule 425 of the Securities Act of 1933 and deemed filed Pursuant to Rule 14a-12 of the Securities Exchange Act of 1934 Subject Company: Endo, Inc. (Commission File No. 333-280767) Dear Valued Mallinckrodt Partner, I am pleased to share some exciting news regarding Mallinckrodt. We just announced that we have agreed to combine wi

March 13, 2025 8-K/A

Regulation FD Disclosure, Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A (Amendment No. 2) CURRENT REPORT Pursuant to Section 13 OR 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of Earliest Event Reported): March 13, 2025 Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation)

March 13, 2025 EX-99.3

CONFIDENTIAL Project Salvare DISCUSSION MATERIALS FEBRUARY 2025 CONFIDENTIAL Table of Contents PROJECT SALVARE Preliminary Value Creation Analysis of a Potential Transaction Overview of a Potential Generics Separation 4 Appendix Strategic Perspective

Exhibit 99.3 CONFIDENTIAL Project Salvare DISCUSSION MATERIALS FEBRUARY 2025 CONFIDENTIAL Table of Contents PROJECT SALVARE Preliminary Value Creation Analysis of a Potential Transaction Overview of a Potential Generics Separation 4 Appendix Strategic Perspectives on a Potential Transaction 2 3 1 Executive Summary PROJECT SALVARE 3 Preliminary and Illustrative • Given the clear alignment of the Ma

March 13, 2025 EX-99.2

Creating a Global, Scaled, Diversified Pharmaceuticals Leader 1 March 13, 2025 Disclosures There are a number of important factors that could cause actual events to differ materially from those suggested or indicated by such forward-looking statement

Exhibit 99.2 Creating a Global, Scaled, Diversified Pharmaceuticals Leader 1 March 13, 2025 Disclosures No Offer or Solicitation This communication is not intended to and shall not constitute an offer to buy or sell or the solicitation of an offer to buy or sell any securities, or a solicitation of any vote or approval, nor shall there be any sale of securities in any jurisdiction in which such of

March 13, 2025 EX-99.1

FORM OF VOTING AND SUPPORT AGREEMENT

Exhibit 99.1 FORM OF VOTING AND SUPPORT AGREEMENT This Voting and Support Agreement (this “Agreement”) is made and entered into as of March 13, 2025 (the “Agreement Date”), by and among (i) Mallinckrodt plc, a public limited company incorporated in Ireland (hereinafter called “Macaw”), (ii) Endo, Inc., a Delaware corporation (hereinafter called “Eagle”), and (iii) [     ], a shareholder of Eagle (

March 13, 2025 EX-99.1

FORM OF VOTING AND SUPPORT AGREEMENT

Exhibit 99.1 FORM OF VOTING AND SUPPORT AGREEMENT This Voting and Support Agreement (this “Agreement”) is made and entered into as of March 13, 2025 (the “Agreement Date”), by and among (i) Mallinckrodt plc, a public limited company incorporated in Ireland (hereinafter called “Macaw”), (ii) Endo, Inc., a Delaware corporation (hereinafter called “Eagle”), and (iii) [     ], a shareholder of Eagle (

March 13, 2025 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 13, 2025 Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation) (Commission File Num

March 13, 2025 EX-2.1

Transaction Agreement, dated as of March 13, 2025, by and among the Company, Endo and Merger Sub. (filed under Item 1.01).

Exhibit 2.1 EXECUTION VERSION TRANSACTION AGREEMENT by and among Mallinckrodt plc, Endo, Inc., and Salvare Merger Sub LLC, dated as of March 13, 2025 TABLE OF CONTENTS 1. INTERPRETATION 2 1.1 Certain Definitions 2 1.2 Terms Defined Elsewhere 22 1.3 Construction 24 1.4 Captions 25 1.5 Time 25 2. SCHEME 25 2.1 Scheme 25 2.2 Change in Shares 25 3. IMPLEMENTATION OF THE SCHEME; COURT MEETINGs AND EGM

March 13, 2025 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of Earliest Event Reported): March 13, 2025 Mallinckrodt plc

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of Earliest Event Reported): March 13, 2025 Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation) (Commission File Nu

March 13, 2025 425

Filed by Mallinckrodt plc (Commission File No. 001-35803)

Filed by Mallinckrodt plc (Commission File No. 001-35803) Pursuant to Rule 425 of the Securities Act of 1933 and deemed filed Pursuant to Rule 14a-12 of the Securities Exchange Act of 1934 Subject Company: Endo, Inc. (Commission File No. 333-280767) Dear Colleagues, We just announced that we are embarking on the next exciting stage in our evolution by combining with Endo, Inc. This transaction is

March 13, 2025 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A (Amendment No. 1) CURRENT REPORT Pursuant to Section 13 OR 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of Earliest Event Reported): March 13, 20

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A (Amendment No. 1) CURRENT REPORT Pursuant to Section 13 OR 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of Earliest Event Reported): March 13, 2025 Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation)

March 13, 2025 425

Filed by Mallinckrodt plc (Commission File No. 001-35803)

Filed by Mallinckrodt plc (Commission File No. 001-35803) Pursuant to Rule 425 of the Securities Act of 1933 and deemed filed Pursuant to Rule 14a-12 of the Securities Exchange Act of 1934 Subject Company: Endo, Inc. (Commission File No. 333-280767) Dear Mallinckrodt R&D Partner, I’m reaching out to share some exciting news regarding Mallinckrodt. We just announced that we have agreed to combine w

March 13, 2025 425

Employee FAQ

Filed by Mallinckrodt plc (Commission File No. 001-35803) Pursuant to Rule 425 of the Securities Act of 1933 and deemed filed Pursuant to Rule 14a-12 of the Securities Exchange Act of 1934 Subject Company: Endo, Inc. (Commission File No. 333-280767) Employee FAQ 1. What did Mallinckrodt announce? · We announced that Mallinckrodt has agreed to combine with Endo, Inc. · Endo is a diversified pharmac

March 13, 2025 EX-99.2

Creating a Global, Scaled, Diversified Pharmaceuticals Leader 0 March 13, 2025 Today’s Speakers & Agenda 3 Siggi Olafsson Mallinckrodt President & CEO Bryan Reasons Mallinckrodt CFO Mark Bradley Endo CFO Scott Hirsch Endo Interim CEO 1 Strategic Rati

Exhibit 99.2 Creating a Global, Scaled, Diversified Pharmaceuticals Leader 0 March 13, 2025 Disclosures No Offer or Solicitation This communication is not intended to and shall not constitute an offer to buy or sell or the solicitation of an offer to buy or sell any securities, or a solicitation of any vote or approval, nor shall there be any sale of securities in any jurisdiction in which such of

March 13, 2025 EX-99.1

Mallinckrodt and Endo to Combine to Create a Global, Scaled, Diversified Pharmaceuticals Leader Transaction Brings Together Two Highly Complementary Businesses to Broaden Patient Access and Develop New Therapies to Address Unmet Patient Needs Combine

Exhibit 99.1 Mallinckrodt and Endo to Combine to Create a Global, Scaled, Diversified Pharmaceuticals Leader Transaction Brings Together Two Highly Complementary Businesses to Broaden Patient Access and Develop New Therapies to Address Unmet Patient Needs Combined Company Expected to Benefit from Immediate Scale, Robust Cash Flow and Enhanced Financial Flexibility to Invest in Internal and Externa

March 13, 2025 EX-10.18

Form of Second Amended and Restated Restricted Unit Award for Directors under the Mallinckrodt Pharmaceuticals 2024 Stock and Incentive Plan (incorporated by reference to Exhibit 10.18 to Mallinckrodt’s Annual Report on Form 10-K filed March 13, 2025).

Exhibit 10.18 CERTAIN INFORMATION CONTAINED IN THIS EXHIBIT HAS BEEN OMITTED BY MEANS OF REDACTING A PORTION OF THE TEXT AND REPLACING IT WITH [***] BECAUSE IT IS BOTH: (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. [Director Form] Mallinckrodt Pharmaceuticals 2024 Stock and Incentive Plan (“Plan”) TERMS AND CONDITIONS OF SECOND AMENDED AND RESTATED RESTR

March 13, 2025 EX-99.3

CONFIDENTIAL Project Salvare DISCUSSION MATERIALS FEBRUARY 2025 CONFIDENTIAL Table of Contents PROJECT SALVARE Preliminary Value Creation Analysis of a Potential Transaction Overview of a Potential Generics Separation 4 Appendix Strategic Perspective

Exhibit 99.3 CONFIDENTIAL Project Salvare DISCUSSION MATERIALS FEBRUARY 2025 CONFIDENTIAL Table of Contents PROJECT SALVARE Preliminary Value Creation Analysis of a Potential Transaction Overview of a Potential Generics Separation 4 Appendix Strategic Perspectives on a Potential Transaction 2 3 1 Executive Summary PROJECT SALVARE 3 Preliminary and Illustrative • Given the clear alignment of the Ma

March 13, 2025 EX-4.5

Supplemental Indenture No. 2, dated November 29, 2024, to the Indenture, dated as of November 14, 2023, by and among the Issuers, the Guarantors, Wilmington Savings Fund Society, FSB, as First Lien Trustee and Acquiom Agency Services LLC, as Collateral Agent (incorporated by reference to Exhibit 4.5 to the Company’s Annual Report on Form 10-K filed March 13, 2025).

Exhibit 4.5 EXECUTION VERSION SUPPLEMENTAL INDENTURE NO. 2 SUPPLEMENTAL INDENTURE NO. 2 (this “Supplemental Indenture”) dated as of November 29, 2024, among each THERAKOS LLC, a Florida limited liability company (the “Released Guarantor”), MALLINCKRODT INTERNATIONAL FINANCE S.A., a public limited liability company (société anonyme) organized under the laws of the Grand Duchy of Luxembourg, having

March 13, 2025 EX-10.23

Form of Award Forfeiture Agreement, by and between Mallinckrodt and the Grantee named therein (incorporated by reference to Exhibit 10.23 to Mallinckrodt’s Annual Report on Form 10-K filed March 13, 2025).

Exhibit 10.23 Form of Forfeiture Agreement AWARD FORFEITURE AGREEMENT This Award Forfeiture Agreement (this “Agreement”) is entered into on this [●] day of [●] 2024 by and between Mallinckrodt plc (the “Company”) and [●] (“Grantee”). RECITALS WHEREAS, in February 2024, the Company granted to Grantee [●] time-vesting restricted units (the “Award”) subject to the Mallinckrodt Pharmaceuticals 2024 St

March 13, 2025 8-K

Regulation FD Disclosure, Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of Earliest Event Reported): March 13, 2025 Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation) (Commission File Nu

March 13, 2025 425

Filed by Mallinckrodt plc (Commission File No. 001-35803)

Filed by Mallinckrodt plc (Commission File No. 001-35803) Pursuant to Rule 425 of the Securities Act of 1933 and deemed filed Pursuant to Rule 14a-12 of the Securities Exchange Act of 1934 Subject Company: Endo, Inc. (Commission File No. 333-280767) Dear Valued Mallinckrodt Partner, I am reaching out to share some exciting news regarding Mallinckrodt. We just announced that we have agreed to combi

March 13, 2025 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 27, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number : 001-35803 Mallinckrodt plc (Exact

March 13, 2025 EX-19.1

Global Insider Trading Policy.

Exhibit 19.1 Effective Date: January 31, 2025 Table of Contents Section 1 – Statement of Policy 3 Section 2 – Purpose of this Policy 3 Section 3 – Policy Owner and Statement of Responsibility 3 Section 4 – Procedures for all Covered Persons 3 Section 5 – Special Procedures for the Window Group 6 Section 6 – Post-Termination Transactions 7 Section 7 – Exceptions 7 Section 8 – Consequences of Violat

March 13, 2025 EX-99.1

Mallinckrodt and Endo to Combine to Create a Global, Scaled, Diversified Pharmaceuticals Leader Transaction Brings Together Two Highly Complementary Businesses to Broaden Patient Access and Develop New Therapies to Address Unmet Patient Needs Combine

Exhibit 99.1 Mallinckrodt and Endo to Combine to Create a Global, Scaled, Diversified Pharmaceuticals Leader Transaction Brings Together Two Highly Complementary Businesses to Broaden Patient Access and Develop New Therapies to Address Unmet Patient Needs Combined Company Expected to Benefit from Immediate Scale, Robust Cash Flow and Enhanced Financial Flexibility to Invest in Internal and Externa

March 13, 2025 EX-21.1

Subsidiaries of Mallinckrodt plc (incorporated by reference to Exhibit 21.1 to Mallinckrodt’s Annual Report on Form 10-K filed March 13, 2025).

Exhibit 21.1 SUBSIDIARIES OF MALLINCKRODT PLC The following is a list of subsidiaries of Mallinckrodt plc as of December 27, 2024. Name of Subsidiary Jurisdiction of Incorporation/Organization Cache Holdings Limited Bermuda Carnforth Limited Bermuda Dritte CORSA Verwaltungsgesellschaft GmbH Germany Ikaria Australia Pty Ltd Australia Ikaria Canada Inc. Canada IMC Exploration Company Maryland Infaca

March 13, 2025 EX-2.1

Transaction Agreement, dated as of March 13, 2025, by and among the Company, Endo and Merger Sub. (filed under Item 1.01).

Exhibit 2.1 EXECUTION VERSION TRANSACTION AGREEMENT by and among Mallinckrodt plc, Endo, Inc., and Salvare Merger Sub LLC, dated as of March 13, 2025 TABLE OF CONTENTS 1. INTERPRETATION 2 1.1 Certain Definitions 2 1.2 Terms Defined Elsewhere 22 1.3 Construction 24 1.4 Captions 25 1.5 Time 25 2. SCHEME 25 2.1 Scheme 25 2.2 Change in Shares 25 3. IMPLEMENTATION OF THE SCHEME; COURT MEETINGs AND EGM

March 13, 2025 EX-99.2

Creating a Global, Scaled, Diversified Pharmaceuticals Leader 0 March 13, 2025 Today’s Speakers & Agenda 3 Siggi Olafsson Mallinckrodt President & CEO Bryan Reasons Mallinckrodt CFO Mark Bradley Endo CFO Scott Hirsch Endo Interim CEO 1 Strategic Rati

Exhibit 99.2 Creating a Global, Scaled, Diversified Pharmaceuticals Leader 0 March 13, 2025 Disclosures No Offer or Solicitation This communication is not intended to and shall not constitute an offer to buy or sell or the solicitation of an offer to buy or sell any securities, or a solicitation of any vote or approval, nor shall there be any sale of securities in any jurisdiction in which such of

March 13, 2025 EX-10.1

Form of Voting Agreement, by and among, the Company, Endo and the Company’s shareholder(s) party thereto (filed under Item 1.01).

Exhibit 10.1 FORM OF VOTING AND SUPPORT AGREEMENT This Voting and Support Agreement (this “Agreement”) is made and entered into as of March 13, 2025 (the “Agreement Date”), by and among (i) Mallinckrodt plc,, a public limited company incorporated in Ireland (hereinafter called “Macaw”), (ii) Endo, Inc., a Delaware corporation (hereinafter called “Eagle”), and (iii) [        ], a shareholder of Mac

March 13, 2025 EX-10.15

Amendment No. 1 to the Mallinckrodt Pharmaceuticals 2024 Stock and Incentive Plan, dated as of December 2, 2024.

Exhibit 10.15 AMENDMENT NO. 1 TO THE MALLINCKRODT PHARMACEUTICALS 2024 STOCK AND INCENTIVE PLAN This Amendment No. 1 (“Amendment”) to the Mallinckrodt Pharmaceuticals 2024 Stock and Incentive Plan (the “Plan”) is adopted by the Board of Directors of Mallinckrodt public limited company (the “Company”), to be effective as of December 2, 2024. 1. Purpose. The purpose of this Amendment is to amend the

March 13, 2025 EX-10.16

Form of Second Amended and Restated Restricted Unit Award for the CEO under the Mallinckrodt Pharmaceuticals 2024 Stock and Incentive Plan (incorporated by reference to Exhibit 10.16 to Mallinckrodt’s Annual Report on Form 10-K filed March 13, 2025).

Exhibit 10.16 CERTAIN INFORMATION CONTAINED IN THIS EXHIBIT HAS BEEN OMITTED BY MEANS OF REDACTING A PORTION OF THE TEXT AND REPLACING IT WITH [***] BECAUSE IT IS BOTH: (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. [CEO Form] Mallinckrodt Pharmaceuticals 2024 Stock and Incentive Plan (“Plan”) TERMS AND CONDITIONS OF SECOND AMENDED AND RESTATED RESTRICTED

March 13, 2025 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A (Amendment No. 2) CURRENT REPORT Pursuant to Section 13 OR 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of Earliest Event Reported): March 13, 20

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A (Amendment No. 2) CURRENT REPORT Pursuant to Section 13 OR 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of Earliest Event Reported): March 13, 2025 Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation)

March 13, 2025 EX-10.1

Form of Voting Agreement, by and among, the Company, Endo and the Company’s shareholder(s) party thereto (filed under Item 1.01).

Exhibit 10.1 FORM OF VOTING AND SUPPORT AGREEMENT This Voting and Support Agreement (this “Agreement”) is made and entered into as of March 13, 2025 (the “Agreement Date”), by and among (i) Mallinckrodt plc,, a public limited company incorporated in Ireland (hereinafter called “Macaw”), (ii) Endo, Inc., a Delaware corporation (hereinafter called “Eagle”), and (iii) [        ], a shareholder of Mac

March 13, 2025 EX-4.4

Exhibit 4.4

Exhibit 4.4 DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 The following description of the share capital of Mallinckrodt plc (“Mallinckrodt” or the “Company”) is a summary. This summary does not purport to be complete and is qualified in its entirety by reference to the Irish Companies Act 2014 (the “Companies Act”) and the comp

March 13, 2025 EX-99.2

Creating a Global, Scaled, Diversified Pharmaceuticals Leader 1 March 13, 2025 Disclosures There are a number of important factors that could cause actual events to differ materially from those suggested or indicated by such forward-looking statement

Exhibit 99.2 Creating a Global, Scaled, Diversified Pharmaceuticals Leader 1 March 13, 2025 Disclosures No Offer or Solicitation This communication is not intended to and shall not constitute an offer to buy or sell or the solicitation of an offer to buy or sell any securities, or a solicitation of any vote or approval, nor shall there be any sale of securities in any jurisdiction in which such of

March 13, 2025 425

Filed by Mallinckrodt plc (Commission File No. 001-35803)

Filed by Mallinckrodt plc (Commission File No. 001-35803) Pursuant to Rule 425 of the Securities Act of 1933 and deemed filed Pursuant to Rule 14a-12 of the Securities Exchange Act of 1934 Subject Company: Endo, Inc. (Commission File No. 333-280767) Dear Valued Mallinckrodt Partner, I am reaching out to share some exciting news regarding Mallinckrodt. We just announced that we have agreed to combi

March 13, 2025 425

Filed by Mallinckrodt plc (Commission File No. 001-35803)

Filed by Mallinckrodt plc (Commission File No. 001-35803) Pursuant to Rule 425 of the Securities Act of 1933 and deemed filed Pursuant to Rule 14a-12 of the Securities Exchange Act of 1934 Subject Company: Endo, Inc. (Commission File No. 333-280767) Dear Valued Mallinckrodt Partner, I am reaching out to share some exciting news regarding Mallinckrodt. We just announced that we have agreed to combi

March 13, 2025 8-K/A

Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A (Amendment No. 1) CURRENT REPORT Pursuant to Section 13 OR 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of Earliest Event Reported): March 13, 2025 Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation)

March 13, 2025 425

Filed by Mallinckrodt plc (Commission File No. 001-35803)

Filed by Mallinckrodt plc (Commission File No. 001-35803) Pursuant to Rule 425 of the Securities Act of 1933 and deemed filed Pursuant to Rule 14a-12 of the Securities Exchange Act of 1934 Subject Company: Endo, Inc. (Commission File No. 333-280767) [Name] [Address] By email only RE: Mallinckrodt and Endo to Combine to Create a Global, Scaled, Diversified Pharmaceuticals Leader 13 March 2025 Dear

March 13, 2025 EX-10.17

Form of Second Amended and Restated Restricted Unit Award for Executive Officers under the Mallinckrodt Pharmaceuticals 2024 Stock and Incentive Plan (incorporated by reference to Exhibit 10.17 to Mallinckrodt’s Annual Report on Form 10-K filed March 13, 2025).

Exhibit 10.17 CERTAIN INFORMATION CONTAINED IN THIS EXHIBIT HAS BEEN OMITTED BY MEANS OF REDACTING A PORTION OF THE TEXT AND REPLACING IT WITH [***] BECAUSE IT IS BOTH: (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. [EC other than CEO Form] Mallinckrodt Pharmaceuticals 2024 Stock and Incentive Plan (“Plan”) TERMS AND CONDITIONS OF SECOND AMENDED AND RESTA

March 13, 2025 425

Filed by Mallinckrodt plc (Commission File No. 001-35803)

Filed by Mallinckrodt plc (Commission File No. 001-35803) Pursuant to Rule 425 of the Securities Act of 1933 and deemed filed Pursuant to Rule 14a-12 of the Securities Exchange Act of 1934 Subject Company: Endo Inc. (Commission File No. 333-280767) Social Media Posts LinkedIn X (Twitter)

December 5, 2024 EX-10.4

Form of Second Amended and Restated Performance Unit Award for Directors under the Mallinckrodt Pharmaceuticals 2024 Stock and Incentive Plan (incorporated by reference to Exhibit 10.4 to Mallinckrodt’s Current Report on Form 8-K filed December 5, 2024)

Exhibit 10.4 CERTAIN INFORMATION CONTAINED IN THIS EXHIBIT HAS BEEN OMITTED BY MEANS OF REDACTING A PORTION OF THE TEXT AND REPLACING IT WITH [***] BECAUSE IT IS BOTH: (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. [Director Form] Mallinckrodt Pharmaceuticals 2024 Stock and Incentive Plan (“Plan”) TERMS AND CONDITIONS OF SECOND AMENDED AND RESTATED PERFOR

December 5, 2024 EX-10.2

Form of Second Amended and Restated Performance Unit Award for the CEO under the Mallinckrodt Pharmaceuticals 2024 Stock and Incentive Plan (incorporated by reference to Exhibit 10.2 to Mallinckrodt’s Current Report on Form 8-K filed December 5, 2024)

Exhibit 10.2 CERTAIN INFORMATION CONTAINED IN THIS EXHIBIT HAS BEEN OMITTED BY MEANS OF REDACTING A PORTION OF THE TEXT AND REPLACING IT WITH [***] BECAUSE IT IS BOTH: (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. [CEO Form] Mallinckrodt Pharmaceuticals 2024 Stock and Incentive Plan (“Plan”) TERMS AND CONDITIONS OF SECOND AMENDED AND RESTATED PERFORMANCE

December 5, 2024 EX-10.3

Form of Second Amended and Restated Performance Unit Award for Executive Officers under the Mallinckrodt Pharmaceuticals 2024 Stock and Incentive Plan (incorporated by reference to Exhibit 10.3 to Mallinckrodt’s Current Report on Form 8-K filed December 5, 2024)

Exhibit 10.3 CERTAIN INFORMATION CONTAINED IN THIS EXHIBIT HAS BEEN OMITTED BY MEANS OF REDACTING A PORTION OF THE TEXT AND REPLACING IT WITH [***] BECAUSE IT IS BOTH: (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. [EC other than CEO Form] Mallinckrodt Pharmaceuticals 2024 Stock and Incentive Plan (“Plan”) TERMS AND CONDITIONS OF SECOND AMENDED AND RESTAT

December 5, 2024 EX-10.1

Mallinckrodt plc Second Amended and Restated Long-Term Transaction Incentive Plan, amended as of December 2, 2024 (incorporated by reference to Exhibit 10.1 to Mallinckrodt’s Current Report on Form 8-K filed December 5, 2024)

Exhibit 10.1 CERTAIN INFORMATION CONTAINED IN THIS EXHIBIT HAS BEEN OMITTED BY MEANS OF REDACTING A PORTION OF THE TEXT AND REPLACING IT WITH [***] BECAUSE IT IS BOTH: (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. MALLINCKRODT PLC SECOND AMENDED AND RESTATED LONG-TERM TRANSACTION INCENTIVE PLAN (“Transaction Incentive Plan”) AS AMENDED AND RESTATED ON DE

December 5, 2024 EX-2.2

Amendment No. 1 to Purchase and Sale Agreement, dated as of November 29, 2024, by and between the Company, Solaris Bidco Limited, Solaris IPCo Limited and Solaris US BidCo, LLC (incorporated by reference to Exhibit 2.2 to the Company’s Current Report on Form 8-K filed December 5, 2024).

Exhibit 2.2 CERTAIN INFORMATION CONTAINED IN THIS EXHIBIT HAS BEEN OMITTED BY MEANS OF REDACTING A PORTION OF THE TEXT AND REPLACING IT WITH [***] BECAUSE IT IS BOTH: (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. EXECUTION VERSION AMENDMENT NO. 1 TO PURCHASE AND SALE AGREEMENT This AMENDMENT NO. 1 (this “Amendment”), dated as of November 29, 2024, to the

December 5, 2024 EX-99.1

Mallinckrodt Completes Divestiture of Therakos® Business Net Proceeds to Reduce the Company’s Net Debt by More Than 60%

EXHIBIT 99.1 Mallinckrodt Completes Divestiture of Therakos® Business Net Proceeds to Reduce the Company’s Net Debt by More Than 60% DUBLIN, December 2, 2024 – Mallinckrodt plc (“Mallinckrodt” or the “Company”), a global specialty pharmaceutical company, today announced that it has completed the previously announced sale of its Therakos business to CVC Capital Partners Fund IX for a purchase price

December 5, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 29, 2024 Mallinckrodt pl

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 29, 2024 Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation) (Commission File

December 5, 2024 EX-99.2

UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION INTRODUCTORY NOTE

Exhibit 99.2 UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION INTRODUCTORY NOTE The following unaudited pro forma condensed combined financial information (“Pro Forma Financial Information”) is derived from the historical consolidated financial statements of Mallinckrodt plc (“Mallinckrodt” or the “Company”). The unaudited Pro Forma Financial Information is for informational and illust

November 21, 2024 SC 13D/A

MNK / Mallinckrodt Plc - New / Bracebridge Capital, LLC - SC 13D/A Activist Investment

SC 13D/A 1 d874622dsc13da.htm SC 13D/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 3)* Mallinckrodt plc (Name of Issuer) Ordinary Shares, par value $0.01 per share (Title of Class of Securities) G5890A102 (CUSIP Number) John N. Spinney, Jr Bracebridge Capital, LLC 888 Boylston Street, Suite 1500 Bosto

November 14, 2024 SC 13G/A

MNK / Mallinckrodt Plc - New / Flynn James E Passive Investment

SC 13G/A 1 e664008sc13ga-mallinckrodt.htm SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13G (Rule 13d-102) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13d-1(b)(c), AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(b) (Amendment No. 2)* Mallinckrodt plc (Name of Issuer) Ordinary Shares, par value $0.01 per share (Title of Class of Securities) G5890A

November 5, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 5, 2024 Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation) (Commission File N

November 5, 2024 EX-99.1

Mallinckrodt plc Reports Third Quarter 2024 Financial Results and Raises Full Year Guidance Achieves Third Quarter Net Sales of $505.5 Million, Reflecting 1.7% Year-Over-Year Growth Reaffirms Full Year Net Sales Guidance and Raises Full Year Adjusted

Exhibit 99.1 Mallinckrodt plc Reports Third Quarter 2024 Financial Results and Raises Full Year Guidance Achieves Third Quarter Net Sales of $505.5 Million, Reflecting 1.7% Year-Over-Year Growth Reaffirms Full Year Net Sales Guidance and Raises Full Year Adjusted EBITDA Guidance After Adjusting Both Metrics for the Therakos Transaction Delivers Third Consecutive Quarter of Acthar® Gel Growth, Unde

November 5, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 27, 2024

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 27, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-35803 Mallinckrodt plc

October 21, 2024 SC 13G/A

Hudson Bay Capital Management LP - MNKTQ 13GA

SC 13G/A 1 mnktq13ga.htm MNKTQ 13GA SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 2)* Mallinckrodt plc (Name of Issuer) Ordinary Shares, $0.01 par value (Title of Class of Securities) ** (CUSIP Number) May 31, 2024 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the ru

September 10, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 10, 2024 Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation) (Commission File

September 10, 2024 EX-99.1

MALLINCKRODT PLC SEGMENT OPERATING INCOME TO ADJUSTED EBITDA RECONCILIATIONS (unaudited, in millions) Successor Three Months Ended June 28, 2024 Three Months Ended March 29, 2024 Specialty Generics Segment Operating Income per SEC Filings 2 $ 62.4 $

EXHIBIT 99.1 MALLINCKRODT PLC SPECIALTY GENERICS SEGMENT ADJUSTED EBITDA (unaudited, in millions) Three Months Ended June 28, 2024 Three Months Ended March 29, 2024 Three Months Ended December 29, 2023 Three Months Ended September 29, 2023 Three Months Ended June 30, 2023 Three Months Ended March 31, 2023 Specialty Generics Adjusted EBITDA 1 $ 94.6 $ 67.6 $ 46.1 $ 64.8 $ 46.1 $ 43.1 MALLINCKRODT P

August 27, 2024 SC 13G/A

MNK / Mallinckrodt Plc - New / MARATHON ASSET MANAGEMENT LP - SC 13G/A Passive Investment

SC 13G/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1)* Mallinckrodt plc (Name of Issuer) Common Stock, par value $0.01 per share (Title of Class of Securities) G5890A102 (CUSIP Number) August 27, 2024 (Date of Event Which Requires Filing of This Statement) Check the appropriate box to designate the

August 6, 2024 EX-99.1

Mallinckrodt plc Reports Second Quarter 2024 Financial Results and Raises Full Year Guidance Achieves Second Quarter Net Sales of $514.3 Million, Reflecting 8.3% Year-Over-Year Growth on a Reported Basis and 8.4% on a Constant Currency Basis Reports

Exhibit 99.1 Mallinckrodt plc Reports Second Quarter 2024 Financial Results and Raises Full Year Guidance Achieves Second Quarter Net Sales of $514.3 Million, Reflecting 8.3% Year-Over-Year Growth on a Reported Basis and 8.4% on a Constant Currency Basis Reports Net Loss of $43.3 Million, Reflecting a 94.2% Year-Over-Year Improvement; Delivers Adjusted EBITDA of $174.0 Million, Reflecting 20.8% Ye

August 6, 2024 EX-10.7

Mallinckrodt plc Amended and Restated Long-Term Transaction Incentive Plan.*

Exhibit 10.7 CERTAIN INFORMATION CONTAINED IN THIS EXHIBIT HAS BEEN OMITTED BY MEANS OF REDACTING A PORTION OF THE TEXT AND REPLACING IT WITH [***] BECAUSE IT IS BOTH: (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. MALLINCKRODT PLC AMENDED AND RESTATED LONG-TERM TRANSACTION INCENTIVE PLAN (“Transaction Incentive Plan”) A.Purposes. The Board of Directors (

August 6, 2024 EX-10.3

Form of Amended and Restated Restricted Unit Award for Directors under the Mallinckrodt plc 2024 Stock and Incentive Plan.

Exhibit 10.3 CERTAIN INFORMATION CONTAINED IN THIS EXHIBIT HAS BEEN OMITTED BY MEANS OF REDACTING A PORTION OF THE TEXT AND REPLACING IT WITH [***] BECAUSE IT IS BOTH: (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. [Director Form] Mallinckrodt Pharmaceuticals 2024 Stock and Incentive Plan (“Plan”) TERMS AND CONDITIONS OF Amended and Restated RESTRICTED UN

August 6, 2024 EX-10.4

Form of Amended and Restated Performance Unit Award for Officers under the Mallinckrodt plc 2024 Stock and Incentive Plan.

Exhibit 10.4 CERTAIN INFORMATION CONTAINED IN THIS EXHIBIT HAS BEEN OMITTED BY MEANS OF REDACTING A PORTION OF THE TEXT AND REPLACING IT WITH [***] BECAUSE IT IS BOTH: (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. [EC other than CEO Form] Mallinckrodt Pharmaceuticals 2024 Stock and Incentive Plan (“Plan”) TERMS AND CONDITIONS OF Amended and Restated PERF

August 6, 2024 EX-10.2

Form of Amended and Restated Restricted Unit Award for the CEO under the Mallinckrodt plc 2024 Stock and Incentive Plan.

Exhibit 10.2 CERTAIN INFORMATION CONTAINED IN THIS EXHIBIT HAS BEEN OMITTED BY MEANS OF REDACTING A PORTION OF THE TEXT AND REPLACING IT WITH [***] BECAUSE IT IS BOTH: (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. [CEO Form] Mallinckrodt Pharmaceuticals 2024 Stock and Incentive Plan (“Plan”) TERMS AND CONDITIONS OF AMENDED AND RESTATED RESTRICTED UNIT AW

August 6, 2024 EX-4.3

Supplemental Indenture No. 1, dated as of May 1, 2024, to the Indenture, dated as of November 14, 2023, by and among the Issuers, the Guarantors, Wilmington Savings Fund Society, FSB, as First Lien Trustee and Acquiom Agency Services LLC, as Collateral Agent (incorporated by reference to Exhibit 4.3 to Mallinckrodt’s Quarterly Report on Form 10-Q filed August 6, 2024).

EXHIBIT 4.3 SUPPLEMENTAL INDENTURE NO. 1 SUPPLEMENTAL INDENTURE NO. 1 (this “Supplemental Indenture”) dated as of May 1, 2024, among each Subsidiary Guarantor listed on Schedule 1 hereto (the “Released Guarantors”), MALLINCKRODT INTERNATIONAL FINANCE S.A., a public limited liability company (société anonyme) organized under the laws of the Grand Duchy of Luxembourg, having its registered office at

August 6, 2024 EX-10.5

Form of Amended and Restated Performance Unit Award for the CEO under the Mallinckrodt plc 2024 Stock and Incentive Plan.

Exhibit 10.5 CERTAIN INFORMATION CONTAINED IN THIS EXHIBIT HAS BEEN OMITTED BY MEANS OF REDACTING A PORTION OF THE TEXT AND REPLACING IT WITH [***] BECAUSE IT IS BOTH: (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. [CEO Form] Mallinckrodt Pharmaceuticals 2024 Stock and Incentive Plan (“Plan”) Terms and Conditions OF Amended and Restated PERFORMANCE RESTRI

August 6, 2024 EX-10.1

Form of Amended and Restated Restricted Unit Award for Officers under the Mallinckrodt plc 2024 Stock and Incentive Plan.

Exhibit 10.1 CERTAIN INFORMATION CONTAINED IN THIS EXHIBIT HAS BEEN OMITTED BY MEANS OF REDACTING A PORTION OF THE TEXT AND REPLACING IT WITH [***] BECAUSE IT IS BOTH: (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. [EC other than CEO Form] Mallinckrodt Pharmaceuticals 2024 Stock and Incentive Plan (“Plan”) TERMS AND CONDITIONS OF Amended and Restated REST

August 6, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 28, 2024

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 28, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number : 001-35803 Mallinckrodt plc (Ex

August 6, 2024 EX-10.6

Form of Amended and Restated Performance Unit Award for Directors under the Mallinckrodt plc 2024 Stock and Incentive Plan.

Exhibit 10.6 CERTAIN INFORMATION CONTAINED IN THIS EXHIBIT HAS BEEN OMITTED BY MEANS OF REDACTING A PORTION OF THE TEXT AND REPLACING IT WITH [***] BECAUSE IT IS BOTH: (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. [Director Form] Mallinckrodt Pharmaceuticals 2024 Stock and Incentive Plan (“Plan”) TERMS AND CONDITIONS OF Amended and Restated PERFORMANCE R

August 6, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 6, 2024 Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation) (Commission File Num

August 5, 2024 EX-99.1

Mallinckrodt Reaches Agreement to Sell Therakos® Business to CVC for $925 Million Divestiture Advances Mallinckrodt’s Strategic Priorities to Optimize Capital Structure and Focus on Core Areas of Expertise Mallinckrodt to Use Net Proceeds to Reduce N

Exhibit 99.1 Mallinckrodt Reaches Agreement to Sell Therakos® Business to CVC for $925 Million Divestiture Advances Mallinckrodt’s Strategic Priorities to Optimize Capital Structure and Focus on Core Areas of Expertise Mallinckrodt to Use Net Proceeds to Reduce Net Debt by More Than 50% CVC Brings Resources and Expertise to Further Develop and Commercialize Therakos DUBLIN and LUXEMBOURG – August

August 5, 2024 EX-2.1

Purchase and Sale Agreement, dated as of August 3, 2024, by and between the Company, Solaris Bidco Limited, Solaris IPCo Limited and Solaris US BidCo LLC (incorporated by reference to Exhibit 2.1 to the Company’s Current Report on Form 8-K filed August 5, 2024).

Exhibit 2.1 EXECUTION VERSION PURCHASE AND SALE AGREEMENT BY AND BETWEEN MALLINCKRODT PLC SOLARIS BIDCO LIMITED SOLARIS IPCO LIMITED AND SOLARIS US BIDCO, LLC Dated as of August 3, 2024 EXECUTION VERSION Table of Contents Page Article I DEFINITIONS 5 Section 1.1 Definitions 5 Section 1.2 Other Defined Terms 31 Article II PURCHASE AND SALE; CLOSING; DEFERRED CLOSINGS 36 Section 2.1 Purchase and Sal

August 5, 2024 8-K

Regulation FD Disclosure, Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d)  of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 5, 2024 Mallinckrodt plc (Exact name of registrant as specified in its charter) Commission file number 001-35803 Ireland 98-1088325 (State or other jurisdiction of incorporati

July 8, 2024 SC 13D/A

MNK / Mallinckrodt Plc - New / Silver Point Capital L.P. - SC 13D/A Activist Investment

SC 13D/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 2)* Mallinckrodt plc (Name of Issuer) Common Stock, par value $0.01 per share (Title of Class of Securities) G5890A102 (CUSIP Number) James Kasmarcik Silver Point Capital, L.P. 2 Greenwich Plaza, Suite 1 Greenwich, CT 06830 203-542-4200 (Name, Addre

July 8, 2024 EX-99.1

AGREEMENT REGARDING THE JOINT FILING OF SCHEDULE 13D

EX-99.1 2 d851058dex991.htm EX-99.1 Exhibit 1 AGREEMENT REGARDING THE JOINT FILING OF SCHEDULE 13D The undersigned hereby agree as follows: (i) Each of them is individually eligible to use the Schedule 13D to which this Exhibit is attached, and such Schedule 13D is filed on behalf of each of them; and (ii) Each of them is responsible for the timely filing of such Schedule 13D and any amendments th

June 26, 2024 SC 13D/A

MNK / Mallinckrodt Plc - New / Hein Park Capital Management LP - SCHEDULE 13D/A, AMENDMENT #3 Activist Investment

SC 13D/A 1 h13da3.htm SCHEDULE 13D/A, AMENDMENT #3 SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D (Amendment No. 3)* Under the Securities Exchange Act of 1934 Mallinckrodt plc (Name of Issuer) Common Stock, par value $0.01 per share (Title of Class of Securities) G5890A102 (CUSIP Number) Jay Schoenfarber c/o Hein Park Capital Management LP 888 Seventh Avenue, 41st Floor, Ne

June 18, 2024 SC 13G/A

MNK / Mallinckrodt Plc - New / GOLDENTREE ASSET MANAGEMENT LP Passive Investment

United States Securities and Exchange Commission Washington, D.C. 20549 Schedule 13G (Rule 13d-102) Information to be Included in Statements Filed Pursuant to § 240.13d-1(b), (c) and (d) and Amendments Thereto Filed Pursuant to § 240.13d-2 UNDER THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 1)* Mallinckrodt plc (Name of Issuer) Ordinary Shares (Title of Class of Securities) G5890A102 (CUSIP N

May 28, 2024 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 (State or other jurisdiction of incorporation) (Co

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 (State or other jurisdiction of incorporation) (Commission File Number) College Business & Technology Park, Cruiserath, Blanchardstown, Dublin 15, Ireland (Address of principal executive offices) (Zip

May 28, 2024 EX-1.01

Exhibit 1.01

Exhibit 1.01 Conflict Minerals Report Introduction Mallinckrodt plc is a global business consisting of multiple wholly owned subsidiaries (collectively, “Mallinckrodt” or “the Company”) that develops, manufactures, markets and distributes specialty pharmaceutical products and therapies. The Company’s Specialty Brands reportable segment’s areas of focus include autoimmune and rare diseases in speci

May 10, 2024 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 9, 2024 Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation) (Commission File Numbe

May 9, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 29, 2024

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 29, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number : 001-35803 Mallinckrodt plc (E

May 9, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 9, 2024 Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation) (Commission File Number

May 9, 2024 EX-99.1

Mallinckrodt plc Reports First Quarter 2024 Financial Results and Reaffirms Full Year Guidance Achieves First Quarter Net Sales of $467.8 Million, Reflecting 10.2% Year-Over-Year Growth on a Reported and Constant Currency Basis Reports Net Loss of $6

Exhibit 99.1 Mallinckrodt plc Reports First Quarter 2024 Financial Results and Reaffirms Full Year Guidance Achieves First Quarter Net Sales of $467.8 Million, Reflecting 10.2% Year-Over-Year Growth on a Reported and Constant Currency Basis Reports Net Loss of $65.4 Million, Reflecting a 73.8% Year-Over-Year Improvement; Delivers Adjusted EBITDA of $144.9 Million, Reflecting 17.3% Year-Over-Year G

April 15, 2024 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

April 8, 2024 8-K

Regulation FD Disclosure

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 8, 2024 Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation) (Commission File Num

April 8, 2024 8-K

Financial Statements and Exhibits, Changes in Registrant's Certifying Accountant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 3, 2024 Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation) (Commission File Num

April 8, 2024 SC 13D/A

MNK / Mallinckrodt Plc - New / Hein Park Capital Management LP - SCHEDULE 13D (AMENDMENT NO. 2) Activist Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D (Amendment No. 2)* Under the Securities Exchange Act of 1934 Mallinckrodt plc (Name of Issuer) Common Stock, par value $0.01 per share (Title of Class of Securities) G5890A102 (CUSIP Number) Jay Schoenfarber c/o Hein Park Capital Management LP 888 Seventh Avenue, 41st Floor, New York, NY 10019 212-299-4785 (Name, Address and Te

April 8, 2024 EX-16.1

Letter from Deloitte & Touche LLP.

Exhibit 16.1 April 8, 2024 Securities and Exchange Commission 100 F Street, N.E. Washington, D.C. 20549-7561 Dear Sirs/Madams: We have read Item 4.01 of Mallinckrodt plc’s Form 8-K dated April 8, 2024, and have the following comments: 1. We agree with the statements made in (a) the second sentence of the first paragraph, (b) the second paragraph, (c) the third paragraph, and (d) the fourth paragra

March 26, 2024 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 29, 2023 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number : 001-35803 Mallinckrodt plc (Exact

March 26, 2024 EX-21.1

Subsidiaries of Mallinckrodt plc.

Exhibit 21.1 SUBSIDIARIES OF MALLINCKRODT PLC The following is a list of subsidiaries of Mallinckrodt plc as of December 29, 2023. Name of Subsidiary Jurisdiction of Incorporation/Organization Acthar IP Unlimited Company Ireland Cache Holdings Limited Bermuda Carnforth Limited Bermuda Dritte CORSA Verwaltungsgesellschaft GmbH Germany Ikaria Australia Pty Ltd Australia Ikaria Canada Inc. Canada IMC

March 26, 2024 EX-10.15

Form of Second Amended and Restated Employment Agreement for Executive Officers.

Exhibit 10.15 SECOND AMENDED AND RESTATED EMPLOYMENT AGREEMENT This SECOND AMENDED AND RESTATED EMPLOYMENT AGREEMENT (this “Agreement”) is entered into on February 2, 2024 (the “Effective Date”) by and between ST Shared Services LLC, a Delaware limited liability company, or any successor thereto (the “Company”), and [ ] (the “Executive”) (collectively referred to as “Parties” or individually refer

March 26, 2024 EX-10.16

First Amended and Restated Employment Agreement, dated as of February 28, 2024, between Mallinckrodt Pharmaceuticals Ireland, Ltd. and Paul O’Neill (incorporated by reference to Exhibit 10.16 to Mallinckrodt’s Annual Report on Form 10-K filed March 26, 2024).

EXHIBIT 10.16 FIRST AMENDED AND RESTATED EMPLOYMENT AGREEMENT This FIRST AMENDED AND RESTATED EMPLOYMENT AGREEMENT (this “Agreement”) is entered into on February 28, 2024 (the “Effective Date”) by and between Mallinckrodt Pharmaceuticals Ireland Ltd., an Irish limited liability company, or any successor thereto (the “Company”), and Paul O’Neill (the “Executive”) (collectively referred to as “Parti

March 26, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 26, 2024 Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation) (Commission File Num

March 26, 2024 EX-99.1

Mallinckrodt plc Reports Fourth Quarter and Fiscal Year 2023 Financial Results and Provides 2024 Guidance Exceeds High End of Guidance Range on Net Sales and Adjusted EBITDA for Fiscal Year Received U.S. Food and Drug Administration (FDA) Approval of

Exhibit 99.1 Mallinckrodt plc Reports Fourth Quarter and Fiscal Year 2023 Financial Results and Provides 2024 Guidance Exceeds High End of Guidance Range on Net Sales and Adjusted EBITDA for Fiscal Year Received U.S. Food and Drug Administration (FDA) Approval of Supplemental New Drug Application for Acthar® Gel (repository corticotropin injection) Single-Dose Pre-filled SelfJect™ Injector (SelfJe

March 26, 2024 EX-4.3

cription of Mallinckrodt's Registered Securities.

Exhibit 4.3 DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 The following description of the share capital of Mallinckrodt plc (“Mallinckrodt” or the “Company”) is a summary. This summary does not purport to be complete and is qualified in its entirety by reference to the Irish Companies Act 2014 (the “Companies Act”) and the comp

March 20, 2024 EX-99.1

MALLINCKRODT PLC Process for Transferring Shares

Exhibit 99.1 MALLINCKRODT PLC Process for Transferring Shares 1. Background 1.1 The Company emerged from Chapter 11 on 14 November 2023 (“Emergence”). Upon Emergence, the Company’s existing shares were cancelled and the Company issued new ordinary shares to certain holders of the Company’s debt. 1.2 The new shares are not listed on any stock exchange and are not held through DTC (the settlement an

March 20, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 20, 2024 Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation) (Commission File Nu

March 15, 2024 SC 13D/A

Squarepoint Ops LLC - AMENDMENT NO. 1

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 1)* Mallinckrodt plc (Name of Issuer) Ordinary Shares, par value US$0.01 per share (Title of Class of Securities) N/A (CUSIP Number) Ronald Veith Squarepoint Ops LLC 250 West 55th Street, 32nd Floor New York, NY 10019 (646) 979-1370 (Name, Address and Teleph

March 11, 2024 SC 13D/A

MNK / Mallinckrodt Plc - New / Hein Park Capital Management LP - SCHEDULE 13D/A, AMENDMENT #1 Activist Investment

SC 13D/A 1 h72224857.htm SCHEDULE 13D/A, AMENDMENT #1 SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D (Amendment No. 1)* Under the Securities Exchange Act of 1934 Mallinckrodt plc (Name of Issuer) Common Stock, par value $0.01 per share (Title of Class of Securities) G5890A102 (CUSIP Number) Jay Schoenfarber c/o Hein Park Capital Management LP 888 Seventh Avenue, 41st Floor,

February 14, 2024 SC 13G/A

MNK / Mallinckrodt Plc - New / Alta Fundamental Advisers LLC - SC 13G/A Passive Investment

SC 13G/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 1)* Mallinckrodt plc (Name of Issuer) Ordinary Shares, par value $0.01 per share (Title of Class of Securities) G5890A102 (CUSIP Number) December 31, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designa

February 14, 2024 SC 13G/A

MNK / Mallinckrodt Plc - New / Sculptor Capital LP - SC 13G/A Passive Investment

SC 13G/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1)* MALLINCKRODT PLC (Name of Issuer) Ordinary Shares, par value $0.01 per share (Title of Class of Securities) G5890A102 (CUSIP Number) December 31, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate

February 14, 2024 SC 13G/A

MNK / Mallinckrodt Plc - New / Sculptor Capital LP - SC 13G/A Passive Investment

SC 13G/A 1 d767652dsc13ga.htm SC 13G/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 2)* MALLINCKRODT PLC (Name of Issuer) Ordinary Shares, par value $0.01 per share (Title of Class of Securities) G5890A102 (CUSIP Number) December 31, 2023 (Date of Event Which Requires Filing of this Statement) Check th

February 14, 2024 SC 13G/A

MNK / Mallinckrodt Plc - New / CONTINENTAL GENERAL INSURANCE CO - AMENDMENT NO. 1 TO THE SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G (Rule 13d-102) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13d-1(b), (c), AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(b) (Amendment No. 1)1 Mallinckrodt plc (Name of Issuer) Ordinary Shares, par value $0.01 per share (Title of Class of Securities) G5890A102 (CUSIP Number) Decem

February 12, 2024 SC 13G/A

MNK / Mallinckrodt Plc - New / Flynn James E Passive Investment

SC 13G/A 1 e619246sc13ga-mallinckrodt.htm SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13G (Rule 13d-102) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13d-1(b)(c), AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(b) (Amendment No. 1)* Mallinckrodt plc (Name of Issuer) Ordinary Shares, par value $0.01 per share (Title of Class of Securities) G5890A

February 6, 2024 SC 13G/A

MNK / Mallinckrodt Plc - New / Hudson Bay Capital Management LP - MNKTQ 13GA Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 1)* Mallinckrodt plc (Name of Issuer) Ordinary Shares, $0.01 par value (Title of Class of Securities) G5890A102 (CUSIP Number) December 31, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which thi

February 6, 2024 SC 13G

MNK / Mallinckrodt Plc - New / MARATHON ASSET MANAGEMENT LP - SC 13G Passive Investment

SC 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No.  )* Mallinckrodt plc (Name of Issuer) Common Stock, par value $0.01 per share (Title of Class of Securities) G5890A102 (CUSIP Number) November 14, 2023 (Date of Event Which Requires Filing of This Statement) Check the appropriate box to designate the

February 6, 2024 EX-99.1

JOINT FILING AGREEMENT PURSUANT TO RULE 13D-1(K)

EX-99.1 2 d760480dex991.htm EX-99.1 Exhibit 99.1 JOINT FILING AGREEMENT PURSUANT TO RULE 13D-1(K) The undersigned acknowledge and agree that the foregoing Statement on Schedule 13G is filed on behalf of each of the undersigned and that all subsequent amendments to this Statement on Schedule 13G may be filed on behalf of each of the undersigned without the necessity of filing additional joint filin

February 2, 2024 EX-10.2

Form of Second Amended and Restated Employment Agreement for Executive Officers (incorporated by reference to Exhibit 10.2 to Mallinckrodt’s Current Report on Form 8-K filed February 2, 2024).

SECOND AMENDED AND RESTATED EMPLOYMENT AGREEMENT This SECOND AMENDED AND RESTATED EMPLOYMENT AGREEMENT (this “Agreement”) is entered into on [ · ] (the “Effective Date”) by and between [ST Shared Services LLC],1 a Delaware limited liability company, or any successor thereto (the “Company”), and [ · ] (the “Executive”) (collectively referred to as “Parties” or individually referred to as a “Party”).

February 2, 2024 EX-10.8

Form of Performance Stock Unit Award for the CEO under the Mallinckrodt plc 2024 Stock and Incentive Plan.*

Exhibit 10.8 CERTAIN INFORMATION CONTAINED IN THIS EXHIBIT HAS BEEN OMITTED BY MEANS OF REDACTING A PORTION OF THE TEXT AND REPLACING IT WITH [***] BECAUSE IT IS BOTH: (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. [CEO Form] Mallinckrodt Pharmaceuticals 2024 Stock and Incentive Plan (“Plan”) Terms and Conditions of Performance Restricted Unit Award Decem

February 2, 2024 EX-10.3

Amendment No. 1 to the Mallinckrodt Pharmaceuticals 2024 Stock and Incentive Plan, dated as of December 2, 2024 (incorporated by reference to Exhibit 10.3 to Mallinckrodt’s Current Report on Form 8-K filed February 2, 2024).

Exhibit 10.3 MALLINCKRODT PHARMACEUTICALS 2024 STOCK AND INCENTIVE PLAN Effective February 2, 2024 Article I PURPOSE 1.1 Purpose. The purposes of this Plan are to promote the interests of the Company by (i) aiding in the recruitment and retention of Directors, Employees and Consultants, (ii) providing incentives to Directors, Employees and Consultants by means of performance-related incentives to

February 2, 2024 EX-10.7

Form of Performance Stock Unit Award for Officers under the Mallinckrodt plc 2024 Stock and Incentive Plan.*

Exhibit 10.7 CERTAIN INFORMATION CONTAINED IN THIS EXHIBIT HAS BEEN OMITTED BY MEANS OF REDACTING A PORTION OF THE TEXT AND REPLACING IT WITH [***] BECAUSE IT IS BOTH: (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. [EC other than CEO Form] Mallinckrodt Pharmaceuticals 2024 Stock and Incentive Plan (“Plan”) Terms and Conditions of Performance Restricted Un

February 2, 2024 EX-10.6

Form of Restricted Stock Unit Award for Directors under the Mallinckrodt plc 2024 Stock and Incentive Plan (incorporated by reference to Exhibit 10.6 to the Company’s Current Report on Form 8-K filed February 2, 2024).

  Exhibit 10.6   [Director Form]   Mallinckrodt Pharmaceuticals 2024 Stock and Incentive Plan (“Plan”)   Terms and Conditions of Restricted Unit Award   RESTRICTED UNIT AWARD (“Award”) granted on [ · ], 2024 (the “Grant Date”).   1.            Grant of Restricted Units. Mallinckrodt plc (the “Company”) has granted you [ · ] Restricted Units subject to the provisions of these Terms and Conditions a

February 2, 2024 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 2, 2024 Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation) (Commission File

February 2, 2024 EX-10.5

Form of Restricted Stock Unit Award for the CEO under the Mallinckrodt plc 2024 Stock and Incentive Plan (incorporated by reference to Exhibit 10.5 to the Company’s Current Report on Form 8-K filed February 2, 2024).

  Exhibit 10.5   [CEO Form]   Mallinckrodt Pharmaceuticals 2024 Stock and Incentive Plan (“Plan”)   Terms and Conditions of Restricted Unit Award   RESTRICTED UNIT AWARD (“Award”) granted on [ · ], 2024 (the “Grant Date”).   1.            Grant of Restricted Units. Mallinckrodt plc (the “Company”) has granted you [ · ] Restricted Units subject to the provisions of these Terms and Conditions and th

February 2, 2024 EX-10.4

Form of Restricted Stock Unit Award for Officers under the Mallinckrodt plc 2024 Stock and Incentive Plan (incorporated by reference to Exhibit 10.4 to the Company’s Current Report on Form 8-K filed February 2, 2024).

Exhibit 10.4 [EC other than CEO Form] Mallinckrodt Pharmaceuticals 2024 Stock and Incentive Plan (“Plan”) Terms and Conditions of Restricted Unit Award RESTRICTED UNIT AWARD (“Award”) granted on [ · ], 2024 (the “Grant Date”). 1. Grant of Restricted Units. Mallinckrodt plc (the “Company”) has granted you [ · ] Restricted Units subject to the provisions of these Terms and Conditions and the Plan. T

February 2, 2024 EX-10.10

Mallinckrodt plc Transaction Incentive Plan.*

Exhibit 10.10 CERTAIN INFORMATION CONTAINED IN THIS EXHIBIT HAS BEEN OMITTED BY MEANS OF REDACTING A PORTION OF THE TEXT AND REPLACING IT WITH [***] BECAUSE IT IS BOTH: (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. MALLINCKRODT PLC TRANSACTION INCENTIVE PLAN A.            Purposes. The Board of Directors (the “Board”) of Mallinckrodt plc (the “Company”),

February 2, 2024 EX-10.9

Form of Performance Stock Unit Award for Directors under the Mallinckrodt plc 2024 Stock and Incentive Plan.*

Exhibit 10.9 CERTAIN INFORMATION CONTAINED IN THIS EXHIBIT HAS BEEN OMITTED BY MEANS OF REDACTING A PORTION OF THE TEXT AND REPLACING IT WITH [***] BECAUSE IT IS BOTH: (I) NOT MATERIAL AND (II) THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. [Director Form] Mallinckrodt Pharmaceuticals 2024 Stock and Incentive Plan (“Plan”) Terms and Conditions of Performance Restricted Unit Award

February 2, 2024 EX-10.1

Second Amended and Restated Employment Agreement, dated as of February 2, 2024, by and between ST Shared Services LLC and Sigurdur Olafsson (incorporated by reference to Exhibit 10.1 to Mallinckrodt’s Current Report on Form 8-K filed February 2, 2024).

Exhibit 10.1 SECOND AMENDED AND RESTATED EMPLOYMENT AGREEMENT This SECOND AMENDED AND RESTATED EMPLOYMENT AGREEMENT (this “Agreement”), is entered into on February 2, 2024 (the “Effective Date”) by and between ST Shared Services LLC, a Delaware limited liability company, or any successor thereto (the “Company”), and Sigurdur Olafsson (the “Executive”). WHEREAS, the Executive was previously party t

January 26, 2024 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d)  of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 25, 2024 Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation) (Commission File

January 26, 2024 EX-10.1

Employment Agreement Extension, by and between ST Shared Services LLC and Sigurdur Olafsson, dated January 25, 2024.

Exhibit 10.1 EXECUTION COPY ST SHARED SERVICES LLC January 25, 2024 Sigurdur Olafsson Dear Siggi, Reference is made to that certain Amended and Restated Employment Agreement by and between you and ST Shared Services LLC, dated as of February 22, 2023, as amended on June 22, 2023 and August 4, 2023 (the “Employment Agreement”) and that certain notice (the “Notice of Termination”) that you delivered

January 22, 2024 SC 13D/A

MNK / Mallinckrodt Plc - New / Silver Point Capital L.P. - SC 13D/A Activist Investment

SC 13D/A 1 d106987dsc13da.htm SC 13D/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 1)* Mallinckrodt plc (Name of Issuer) Common Stock, par value $0.01 per share (Title of Class of Securities) G5890A102 (CUSIP Number) James Kasmarcik Silver Point Capital, L.P. 2 Greenwich Plaza, Suite 1 Greenwich, CT 0

January 22, 2024 EX-99.1

AGREEMENT REGARDING THE JOINT FILING OF SCHEDULE 13D

EX-99.1 2 d106987dex991.htm EX-99.1 Exhibit 1 AGREEMENT REGARDING THE JOINT FILING OF SCHEDULE 13D The undersigned hereby agree as follows: (i) Each of them is individually eligible to use the Schedule 13D to which this Exhibit is attached, and such Schedule 13D is filed on behalf of each of them; and (ii) Each of them is responsible for the timely filing of such Schedule 13D and any amendments th

January 17, 2024 SC 13D

MNK / Mallinckrodt Plc - New / Hein Park Capital Management LP - SCHEDULE 13D Activist Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D (Amendment No. )* Under the Securities Exchange Act of 1934 Mallinckrodt plc (Name of Issuer) Common Stock, par value $0.01 per share (Title of Class of Securities) G5890A102 (CUSIP Number) Jay Schoenfarber c/o Hein Park Capital Management LP 888 Seventh Avenue, 41st Floor, New York, NY 10019 212-299-4785 (Name, Address and Tel

January 17, 2024 EX-3

December 3, 2023

EX-3 3 h70223967c.htm SIDE LETTER AGREEMENT Exhibit 3 Privileged & Confidential December 3, 2023 Ladies and Gentlemen: Reference is made herein to the Articles of Association, effective as of the 14th day of November 2023 (the “Constitution”, as may be amended from time to time) of Mallinckrodt plc (the “Company”). Capitalized terms used herein but not otherwise defined have the meanings ascribed

January 17, 2024 EX-1

JOINT FILING AGREEMENT

EX-1 2 h70223967b.htm JOINT FILING AGREEMENT EXHIBIT 1 JOINT FILING AGREEMENT THIS JOINT FILING AGREEMENT is entered into as of January 16, 2024 by and among the parties hereto. The undersigned hereby agree that the Statement on Schedule 13D with respect to the Common Stock, par value $0.01 per share, of Mallinckrodt plc, and any amendment thereafter signed by each of the undersigned shall be (unl

January 9, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 4, 2024 Mallinckrodt plc

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 4, 2024 Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation) (Commission File Nu

January 4, 2024 SC 13G/A

MNK / Mallinckrodt Plc - New / JPMORGAN CHASE & CO - FILING MALLINCKRODT PLC Passive Investment

Schedule 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 01)* Mallinckrodt plc (Name of Issuer) Ordinary shares, par value $0.01 per share (Title of Class of Securities) G5890A102 (CUSIP Number) December 29, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to desi

December 13, 2023 SC 13G

MNK / Mallinckrodt Plc - New / GOLDENTREE ASSET MANAGEMENT LP Passive Investment

SC 13G 1 formsc13g.htm UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G (Rule 13d-102) Information to be Included in Statements Filed Pursuant to § 240.13d-1(b), (c) and (d) and Amendments Thereto Filed Pursuant to § 240.13d-2 UNDER THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. )* Mallinckrodt plc (Name of Issuer) Ordinary Shares (Title of Class of Securiti

December 13, 2023 EX-99

Joint Filing Agreement.

Exhibit 99 JOINT FILING AGREEMENT In accordance with Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree that they are jointly filing this statement on Schedule 13G.

December 1, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 30, 2023 Mallinckrodt pl

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 30, 2023 Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation) (Commission File

November 24, 2023 SC 13D

MNK / Mallinckrodt Plc - New / Silver Point Capital L.P. - SC 13D Activist Investment

SC 13D 1 d721765dsc13d.htm SC 13D UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. )* Mallinckrodt plc (Name of Issuer) Common Stock, par value $0.01 per share (Title of Class of Securities) G5890A102 (CUSIP Number) James Kasmarcik Silver Point Capital, L.P. 2 Greenwich Plaza, Suite 1 Greenwich, CT 06830 2

November 24, 2023 EX-99.1

AGREEMENT REGARDING THE JOINT FILING OF SCHEDULE 13D

EX-99.1 2 d721765dex991.htm EXHIBIT 1 Exhibit 1 AGREEMENT REGARDING THE JOINT FILING OF SCHEDULE 13D The undersigned hereby agree as follows: (i) Each of them is individually eligible to use the Schedule 13D to which this Exhibit is attached, and such Schedule 13D is filed on behalf of each of them; and (ii) Each of them is responsible for the timely filing of such Schedule 13D and any amendments

November 24, 2023 EX-99.1

JOINT FILING AGREEMENT

EX-99.1 2 eh230423564ex9901.htm EXHIBIT 99.1 EXHIBIT 99.1 JOINT FILING AGREEMENT Pursuant to Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, each of the undersigned acknowledges and agrees that the foregoing statement on this Schedule 13D is filed on behalf of the undersigned and that all subsequent amendments to this statement on Schedule 13D shall be filed on

November 24, 2023 SC 13D

MNK / Mallinckrodt Plc - New / Squarepoint Ops LLC - SCHEDULE 13D Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. )* Mallinckrodt plc (Name of Issuer) Ordinary Shares, par value US$0.01 per share (Title of Class of Securities) N/A (CUSIP Number) Ronald Veith Squarepoint Ops LLC 250 West 55th Street, 32nd Floor New York, NY 10019 (646) 979-1370 (Name, Address and Telepho

November 20, 2023 SC 13G

MNK / Mallinckrodt Plc - New / Flynn James E Passive Investment

SC 13G 1 e619072sc13g-mallinckrodt.htm SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13G (Rule 13d-102) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13d-1(b)(c), AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(b) (Amendment No. )* Mallinckrodt plc (Name of Issuer) Ordinary Shares, par value $0.01 per share (Title of Class of Securities) G5890A102

November 17, 2023 SC 13D/A

MNK / Mallinckrodt Plc - New / Bracebridge Capital, LLC - SC 13D/A Activist Investment

SC 13D/A 1 d846461dsc13da.htm SC 13D/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 2)* Mallinckrodt plc (Name of Issuer) Shares of Common Stock, par value $0.01 per share (Title of Class of Securities) G5890A102 (CUSIP Number) John N. Spinney, Jr Bracebridge Capital, LLC 888 Boylston Street, Suite 150

November 15, 2023 EX-10.1

Contingent Value Right Agreement, dated as of November 14, 2023, between Mallinckrodt and the Opioid Master Disbursement Trust II (incorporated by reference to Exhibit 10.1 to Mallinckrodt’s Current Report on Form 8-K filed November 15, 2023).

Exhibit 10.1 CONTINGENT VALUE RIGHT AGREEMENT BETWEEN MALLINCKRODT PLC, AND OPIOID MASTER DISBURSEMENT TRUST II November 14, 2023 Table of Contents Page SECTION 1. Issuance of CVRs 1 SECTION 2. Nontransferable 1 SECTION 3. Duration and Exercise of CVRs 2 SECTION 4. Cancellation of CVRs 4 SECTION 5. Adjustments of Exercise Price and CVR Number 4 SECTION 6. Fractional CVR Shares 14 SECTION 7. Redemp

November 15, 2023 8-K

Regulation FD Disclosure, Changes in Control of Registrant, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Entry into a Material Definitive Agreement, Termination of a Material Definitive Agreement, Material Modification to Rights of Security Holders, Unregistered Sales of Equity Securities, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 14, 2023 Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation) (Commission File

November 15, 2023 EX-10.5

Form of First Lien Intercreditor Agreement, dated as of November 14, 2023, by and among the Issuers, Mallinckrodt, the other Grantors from time to time party thereto, Acquiom Agency Services LLC, as Collateral Agent and as Authorized Representative, Wilmington Savings Fund Society, FSB, as Initial Additional Authorized Representative, and each additional Authorized Representative from time to time party thereto (incorporated by reference to Exhibit 10.5 to Mallinckrodt’s Current Report on Form 8-K filed November 15, 2023).

Exhibit 10.5 FIRST LIEN INTERCREDITOR AGREEMENT among MALLINCKRODT PLC, as the Parent, MALLINCKRODT INTERNATIONAL FINANCE S.A., as the Lux Borrower, MALLINCKRODT CB LLC, as the Co-Borrower, the other Grantors from time to time party hereto, ACQUIOM AGENCY SERVICES LLC, as Collateral Agent for the Pari Passu Secured Parties and as the Authorized Representative for the Credit Agreement Secured Parti

November 15, 2023 EX-99.1

Mallinckrodt Completes Financial Restructuring and Irish Examinership Proceedings and Emerges From Chapter 11 Moving Forward as a Stronger Company With a Significantly Improved Balance Sheet and Increased Financial Flexibility David Stetson and Jon Z

Exhibit 99.1 Mallinckrodt Completes Financial Restructuring and Irish Examinership Proceedings and Emerges From Chapter 11 Moving Forward as a Stronger Company With a Significantly Improved Balance Sheet and Increased Financial Flexibility David Stetson and Jon Zinman Appointed to New Board of Directors DUBLIN – November 14, 2023 – Mallinckrodt plc (“Mallinckrodt” or the “Company”), a global speci

November 15, 2023 EX-10.3

Deed Poll Relating to the Information Rights of Members of Mallinckrodt plc, dated as of November 14, 2023 (incorporated by reference to Exhibit 10.3 to Mallinckrodt’s Current Report on Form 8-K filed November 15, 2023).

Exhibit 10.3 Dated November 14, 2023 MALLINCKRODT PLC Deed Poll relating to the Information Rights Members of Mallinckrodt plc THIS DEED POLL is made on November 14, 2023 by MALLINCKRODT PUBLIC LIMITED COMPANY (the “Company”), a company incorporated under the laws of Ireland with registration number 522227 and having its principal place of business at College Business and Technology Park, Cruisera

November 15, 2023 S-8 POS

As filed with the Securities and Exchange Commission on November 15, 2023

As filed with the Securities and Exchange Commission on November 15, 2023 No. 333-266012 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Post-Effective Amendment No. 1 to Form S-8 Registration Statement No. 333-266012 UNDER THE SECURITIES ACT OF 1933 Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 98-1088325 (State or other Jurisdiction of In

November 15, 2023 EX-3.1

Memorandum and Articles of Association of Mallinckrodt plc (incorporated by reference to Exhibit 3.1 to the Company's Current Report on Form 8-K filed November 15, 2023).

Exhibit 3.1 Companies Act 2014 A PUBLIC COMPANY LIMITED BY SHARES MEMORANDUM and ARTICLES OF ASSOCIATION of MALLINCKRODT PUBLIC LIMITED COMPANY (Adopted on 14 November 2023) Cert. No.: 522227 Companies Act 2014 A PUBLIC COMPANY LIMITED BY SHARES CONSTITUTION of MALLINCKRODT PUBLIC LIMITED COMPANY MEMORANDUM OF ASSOCIATION 1. The name of the Company is Mallinckrodt public limited company. 2. The Co

November 15, 2023 EX-10.4

Credit Agreement, dated as of November 14, 2023, by and among the Issuers, Mallinckrodt, the Lenders Party thereto from time to time, Acquiom Agency Services LLC and Seaport Loan Products LLC, as Co-Administrative Agents, and Acquiom Agency Services LLC, as Collateral Agent (incorporated by reference to Exhibit 10.4 to Mallinckrodt’s Current Report on Form 8-K filed November 15, 2023).

Exhibit 10.4 CREDIT AGREEMENT Dated as of November 14, 2023 among MALLINCKRODT PLC, as the Parent, MALLINCKRODT INTERNATIONAL FINANCE S.A., as Lux Borrower, MALLINCKRODT CB LLC, as Co-Borrower, THE LENDERS PARTY HERETO FROM TIME TO TIME, ACQUIOM AGENCY SERVICES LLC and SEAPORT LOAN PRODUCTS LLC, as Co-Administrative Agents, and ACQUIOM AGENCY SERVICES LLC, as Collateral Agent TABLE OF CONTENTS Pag

November 15, 2023 EX-10.2

Registration Rights Agreement, dated as of November 14, 2023, by and among Mallinckrodt and the initial holders identified therein (incorporated by reference to Exhibit 10.2 to Mallinckrodt’s Current Report on Form 8-K filed November 15, 2023).

Exhibit 10.2 REGISTRATION RIGHTS AGREEMENT This Registration Rights Agreement (including all exhibits hereto and as may be amended, supplemented or restated from time to time in accordance with the terms hereof, this “Agreement”) is made and entered into as of November 14, 2023, by and among Mallinckrodt plc, an Irish public limited company (the “Company”), and the Initial Holders (as defined belo

November 15, 2023 EX-4.1

Indenture, dated as of November 14, 2023, by and among the Issuers, the Guarantors, Wilmington Savings Fund Society, FSB, as first lien trustee and Acquiom Agency Services LLC, as Collateral Agent (incorporated by reference to Exhibit 4.1 to the Company’s Current Report on Form 8-K filed November 15, 2023).

Exhibit 4.1 MALLINCKRODT INTERNATIONAL FINANCE S.A. MALLINCKRODT CB LLC as Issuers the Guarantors party hereto from time to time 14.750% First Lien Senior Secured Notes due 2028 INDENTURE Dated as of November 14, 2023 Wilmington Savings Fund Society, FSB, as First Lien Trustee and Acquiom Agency Services LLC, as First Lien Collateral Agent TABLE OF CONTENTS Page Article I DEFINITIONS AND INCORPORA

November 13, 2023 EX-99.2

High Court of Ireland Confirms Mallinckrodt Scheme of Arrangement Company Expects to Complete Irish Examinership and Emerge from Chapter 11 in Coming Days

Exhibit 99.2 High Court of Ireland Confirms Mallinckrodt Scheme of Arrangement Company Expects to Complete Irish Examinership and Emerge from Chapter 11 in Coming Days DUBLIN – November 10, 2023 – Mallinckrodt plc (OTCMKTS: MNKTQ) (in examination under Part 10 of the Companies Act 2014 of Ireland, and hereinafter “Mallinckrodt” or the “Company”), a global specialty pharmaceutical company, today an

November 13, 2023 EX-99.1

SCHEDULE 1 THE PROPOSALS

  Exhibit 99.1     H.COS.20230000173   FRIDAY THE 10TH DAY OF NOVEMBER 2023 BEFORE MR JUSTICE MICHAEL QUINN IN THE MATTER OF MALLINCKRODT PUBLIC LIMITED COMPANY AND IN THE MATTER OF PART 10 OF THE COMPANIES ACT 2014   The application of Michael McAteer (the Examiner to Mallinckrodt Public Limited Company (the Company)) for the confirmation of the Examiner’s proposals for a scheme of arrangement in

November 13, 2023 EX-2.1

Scheme of Arrangement Between Mallinckrodt Public Limited Company and Its Members and Creditors (included as Schedule 1 to the Order of the High Court of Ireland, dated as of November 10, 2023).

Exhibit 2.1 SCHEDULE 1   THE PROPOSALS         THE HIGH COURT   H.COS.2023.0000173   IN THE MATTER OF   MALLINCKRODT PUBLIC LIMITED COMPANY   AND   IN THE MATTER OF THE COMPANIES ACTS 2014 TO 2020         PROPOSALS FOR A COMPROMISE AND SCHEME OF ARRANGEMENT   BETWEEN   MALLINCKRODT PUBLIC LIMITED COMPANY   AND   ITS MEMBERS AND CREDITORS   DATED 9 OCTOBER 2023             Michael McAteer Examiner

November 13, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Bankruptcy or Receivership

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 10, 2023 Mallinckrodt plc (in examination under Part 10 of the Companies Act 2014 of Ireland) (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088

November 7, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 29, 2023

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 29, 2023 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number : 001-35803 Mallinckrodt pl

November 7, 2023 EX-10.16

Final Amendment to the Opioid MDT II Cooperation Agreement, dated as of August 23, 2033, by and among Mallinckrodt Plc, its undersigned affiliates and the Opioid Master Disbursement Trust II.

EXHIBIT 10.16 AMENDMENT TO OPIOID MDT II COOPERATION AGREEMENT This AMENDMENT TO THE OPIOID MDT II COOPERATION AGREEMENT, dated as of August 23, 2023 (this “Amendment”), is entered into by and among MALLINCKRODT PLC and its undersigned affiliates (each individually a “Mallinckrodt Entity” and collectively “Mallinckrodt”), and the Opioid Master Disbursement Trust II (the “Trust”). Capitalized terms

November 7, 2023 EX-10.15

Final Amendment to Opioid Deferred Cash Payments Agreement, dated August 23, 2023, by and among Mallinckrodt Plc, Mallinckrodt LLC, SpecGX

EXHIBIT 10.15 FINAL AMENDMENT TO OPIOID DEFERRED CASH PAYMENTS AGREEMENT This final AMENDMENT TO THE OPIOID DEFERRED CASH PAYMENTS AGREEMENT, dated as of August 23, 2023 (this “Final Amendment”), is entered into by and among MALLINCKRODT PLC, a public limited company incorporated in Ireland with registered number 522227 (the “Parent”), MALLINCKRODT LLC, a Delaware limited liability company (“MLLC”

November 7, 2023 EX-99.1

Mallinckrodt plc (in Examinership) Reports Third Quarter 2023 Financial Results Third Quarter Net Sales of $497.0 Million Reflects 6.8% Growth Compared to the Prior Year Quarter Acthar® Gel (Repository Corticotropin Injection) Delivery Device Supplem

Exhibit 99.1 Mallinckrodt plc (in Examinership) Reports Third Quarter 2023 Financial Results Third Quarter Net Sales of $497.0 Million Reflects 6.8% Growth Compared to the Prior Year Quarter Acthar® Gel (Repository Corticotropin Injection) Delivery Device Supplemental New Drug Application Accepted by U.S. Food and Drug Administration Financial Restructuring Plan Approved by U.S. Bankruptcy Court;

November 7, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 7, 2023 Mallinckrodt plc

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 7, 2023 Mallinckrodt plc (in examination under Part 10 of the Companies Act 2014 of Ireland) (Exact name of registrant as specified in its charter) Ireland 001-35803 98-10883

October 10, 2023 EX-99.2

Mallinckrodt plc (in examinership) Receives U.S. Court Approval for Financial Restructuring Plan

Exhibit 99.2 Mallinckrodt plc (in examinership) Receives U.S. Court Approval for Financial Restructuring Plan DUBLIN, October 10, 2023 – Mallinckrodt plc (in examinership) (OTCMKTS: MNKTQ) (“Mallinckrodt” or the “Company”), a global specialty pharmaceutical company, today announced that its Plan of Reorganization (the “Plan”) has been confirmed by the U.S. Bankruptcy Court for the District of Dela

October 10, 2023 EX-99.1

IN THE UNITED STATES BANKRUPTCY COURT FOR THE DISTRICT OF DELAWARE

Exhibit 99.1 IN THE UNITED STATES BANKRUPTCY COURT FOR THE DISTRICT OF DELAWARE In re: MALLINCKRODT PLC, et al., Debtors.1 ) ) ) ) ) ) ) ) Chapter 11 Case No. 23-11258 (JTD) (Jointly Administered) ORDER APPROVING (I) THE DISCLOSURE STATEMENT AND (II) CONFIRMING THE FIRST AMENDED PREPACKAGED JOINT PLAN OF REORGANIZATION OF MALLINCKRODT PLC AND ITS DEBTOR AFFILIATES UNDER CHAPTER 11 OF THE BANKRUPTC

October 10, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 10, 2023 Mallinckrodt plc

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 10, 2023 Mallinckrodt plc (in examination under Part 10 of the Companies Act 2014 of Ireland) (Exact name of registrant as specified in its charter) Ireland 001-35803 98-10883

October 10, 2023 EX-2.1

First Amended and Prepackaged Joint Plan of Reorganization of Mallinckrodt plc and Its Debtor Affiliates under Chapter 11 of the Bankruptcy Code, dated as of September 29, 2023 (incorporated by reference to Exhibit 2.1 to the Company’s Current Report on Form 8-K filed October 10, 2023).

Exhibit 2.1 IN THE UNITED STATES BANKRUPTCY COURT FOR THE DISTRICT OF DELAWARE In re: MALLINCKRODT PLC, et al., Debtors.1 ) ) ) ) ) ) ) ) Chapter 11 Case No. 23-11258 (JTD) (Jointly Administered) FIRST AMENDED PREPACKAGED JOINT PLAN OF REORGANIZATION OF MALLINCKRODT PLC AND ITS DEBTOR AFFILIATES UNDER CHAPTER 11 OF THE BANKRUPTCY CODE Mark D. Collins (No. 2981) George A. Davis (admitted pro hac vi

September 22, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 22, 2023 Mallinckrodt p

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 22, 2023 Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation) (Commission File

September 21, 2023 EX-99.1

1. Introduction

Exhibit 99.1 Independent Experts Report S.511 of the Companies Act 2014 Mallinckrodt Public Limited Company 16 September 2023 (as updated on 20 September 2023) James Anderson Deloitte Ireland LLP 29 Earlsfort Terrace Dublin 2 Table of Contents 1. Introduction 3 2. Section 511 (3) (a) Companies Act 2014 – Officers of the Company 18 3. Section 511 (3) (b) Companies Act 2014 – Other Directorships 20

September 21, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 20, 2023 Mallinckrodt p

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 20, 2023 Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation) (Commission File

September 11, 2023 EX-10.1

Credit Agreement, dated as of September 8, 2023 by and among Mallinckrodt plc, Mallinckrodt International Finance S.A., Mallinckrodt CB LLC, the lenders from time to time party thereto, Acquiom Agency Services LLC

Exhibit 10.1 Execution Version SUPERPRIORITY SENIOR SECURED DEBTOR-IN-POSSESSION CREDIT AGREEMENT Dated as of September 8, 2023 among MALLINCKRODT PLC, as the Parent, a Debtor and a Debtor-in-Possession, MALLINCKRODT INTERNATIONAL FINANCE S.A., as Lux Borrower, a Debtor and a Debtor-in-Possession, MALLINCKRODT CB LLC, as Co-Borrower, a Debtor and a Debtor-in-Possession, THE LENDERS PARTY HERETO, A

September 11, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 8, 2023 Mallinckrodt pl

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 8, 2023 Mallinckrodt plc (Exact name of registrant as specified in its charter) Ireland 001-35803 98-1088325 (State or other jurisdiction of incorporation) (Commission File

September 6, 2023 EX-10.2

Originator Performance Guaranty, dated as of August 30, 2023.

Exhibit 10.2 Execution Version ORIGINATOR PERFORMANCE GUARANTY This ORIGINATOR PERFORMANCE GUARANTY (as amended, supplemented or otherwise modified from time to time, this “Performance Guaranty”), dated as of August 30, 2023, is made by each of the Originators (as defined below) in favor of BARCLAYS BANK PLC, as administrative agent (together with its successors and assigns in such capacity, the “

September 6, 2023 EX-10.3

Performance Guaranty, dated as of August 30, 2023.

Exhibit 10.3 Execution Version PERFORMANCE GUARANTY This PERFORMANCE GUARANTY (as amended, supplemented or otherwise modified from time to time, this “Performance Guaranty”), dated as of August 30, 2023, is made by MEH, INC., a Nevada corporation (the “Performance Guarantor” and, in its individual capacity, “MEH”), in favor of BARCLAYS BANK PLC, as administrative agent (together with its successor

September 6, 2023 EX-99.25

EX-99.25

NOTIFICATION OF THE REMOVAL FROM LISTING AND REGISTRATION OF THE STATED SECURITIES NYSE American LLC ("NYSE American" or the "Exchange") hereby notifies the Securities and Exchange Commission (the "Commission") of its intention to remove the Ordinary Shares of Mallinckrodt plc (the "Company") from listing and registration on the Exchange at the opening of business on September 18, 2023, pursuant to the provisions of Rule 12d2-2(b) because, in the opinion of the Exchange, the Ordinary Shares are no longer suitable for continued listing and trading on the Exchange.

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