DCTH / Delcath Systems, Inc. - SEC Filings, Annual Report, Proxy Statement

Delcath Systems, Inc.
US ˙ NasdaqCM ˙ US24661P8077

Basic Stats
LEI 549300NVPLITUM6URT02
CIK 872912
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 Delcath Systems, Inc.
SEC Filings (Chronological Order)
This page provides a complete, chronological list of SEC Filings, excluding ownership filings which we provide elsewhere.
August 15, 2025 S-8

As filed with the Securities and Exchange Commission on August 15, 2025

S-8 As filed with the Securities and Exchange Commission on August 15, 2025 Registration No.

August 15, 2025 EX-3.1

AMENDED AND RESTATED BYLAWS DELCATH SYSTEMS, INC. (A DELAWARE CORPORATION) SECTION 1.

EX-3.1 Exhibit 3.1 AMENDED AND RESTATED BYLAWS OF DELCATH SYSTEMS, INC. (A DELAWARE CORPORATION) SECTION 1. OFFICES Section 1.1 Registered Office. The registered office of Delcath Systems, Inc. (the “Corporation”) in the State of Delaware and the name of the Corporation’s registered agent at such address shall be as set forth in the certificate of incorporation of the Corporation (as the same may

August 15, 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 12, 2025 Delcath Systems,

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 12, 2025 Delcath Systems, Inc. (Exact name of registrant as specified in its charter) Delaware 001-16133 06-1245881 (State or other jurisdiction of incorporation) (Commission F

August 15, 2025 EX-FILING FEES

Table 1: Newly Registered Securities

Calculation of Filing Fee Tables S-8 DELCATH SYSTEMS, INC. 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 Omnibus 2020 Equity Incentive Plan Common Stock, par value $0.01 per share Other 2,200,000 $ 10.28 $ 22,616,000

August 6, 2025 EX-10.1

Delcath Systems Inc. 2020 Omnibus Equity Incentive Plan, as amended.

DELCATH SYSTEMS, INC. 2020 OMNIBUS EQUITY INCENTIVE PLAN (As adopted by Board of Directors on September 30, 2020 and approved by stockholders on November 23, 2020) (As amended by the Board of Directors on March 30, 2021 and approved by stockholders on May 6, 2021) (As subsequently amended by the Board of Directors on April 17, 2023 and approved by stockholders on June 12, 2023) (As subsequently am

August 6, 2025 EX-99.1

Delcath Systems Reports Second Quarter 2025 Results and Business Highlights Conference Call Today at 8:30 a.m. Eastern Time

Exhibit 99.1 Delcath Systems Reports Second Quarter 2025 Results and Business Highlights Conference Call Today at 8:30 a.m. Eastern Time QUEENSBURY, NY – August 6, 2025, Delcath Systems, Inc. (Nasdaq: DCTH) (“Delcath” or the “Company”), an interventional oncology company focused on the treatment of primary and metastatic liver cancers, today announced financial results and business highlights for

August 6, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 DELCATH SYSTEMS, INC

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 DELCATH SYSTEMS, INC.

August 6, 2025 EX-10.2

Delcath Systems, Inc. 2021 Employee Stock Purchase Plan, as amended.

DELCATH SYSTEMS, INC. 2021 EMPLOYEE STOCK PURCHASE PLAN (As amended by the Board of Directors on February 7, 2025, and approved by the stockholders on May 15, 2025) The purpose of the Delcath Systems, Inc. 2021 Employee Stock Purchase Plan (the “Plan”) is to provide eligible employees of Delcath Systems, Inc. (the “Company”) and each Designated Subsidiary (as defined in Section 11) with opportunit

August 6, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2025 Or o 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: 001-16133 DEL

August 6, 2025 EX-10.3

2023 Inducement Plan, as amended.

DELCATH SYSTEMS, INC. 2023 INDUCEMENT PLAN (Adopted by Board of Directors on December 5, 2023) (Amended and Restated by the Board of Directors on February 5, 2025) (Amended and Restated by the Board of Directors on May 14, 2025) General. a.Eligible Award Recipients. The only persons eligible to receive grants of Awards under this Plan are individuals who satisfy the standards for inducement grants

May 22, 2025 8-K

Regulation FD Disclosure, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 22, 2025 DELCATH SYSTEMS, INC.

May 22, 2025 EX-99.1

Delcath Systems Issues Full Year 2025 Guidance 2025 Full Year Total Revenue Guidance of $94 to $98 million Delcath Announces Plan to Enter into National Medicaid Drug Rebate Agreement

Exhibit 99.1 Delcath Systems Issues Full Year 2025 Guidance 2025 Full Year Total Revenue Guidance of $94 to $98 million Delcath Announces Plan to Enter into National Medicaid Drug Rebate Agreement QUEENSBURY, NY – May 22, 2025, Delcath Systems, Inc. (Nasdaq: DCTH) (“Delcath” or the “Company”), an interventional oncology company focused on the treatment of primary and metastatic liver cancers, toda

May 16, 2025 EX-10.2

Delcath Systems, Inc. 2021 Employee Stock Purchase Plan, as amended

Exhibit 10.2 Appendix B DELCATH SYSTEMS, INC. 2021 EMPLOYEE STOCK PURCHASE PLAN The purpose of the Delcath Systems, Inc. 2021 Employee Stock Purchase Plan (the “Plan”) is to provide eligible employees of Delcath Systems, Inc. (the “Company”) and each Designated Subsidiary (as defined in Section 11) with opportunities to purchase shares of the Company’s common stock, par value $0.01 per share (the

May 16, 2025 8-K

Current Report

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 Delcath Systems, Inc. (Exact name of registrant as specified in its charter) Delaware 001-16133 06-1245881 (State or other jurisdiction of incorporation) (Commission File

May 16, 2025 EX-10.1

Delcath Systems, Inc. 2020 Omnibus Equity Incentive Plan, as amended

Exhibit 10.1 Appendix A DELCATH SYSTEMS, INC. 2020 OMNIBUS EQUITY INCENTIVE PLAN (As adopted by Board of Directors on September 30, 2020 and approved by stockholders on November 23, 2020) (As amended by the Board of Directors on March 30, 2021 and approved by stockholders on May 6, 2021) (As subsequently amended by the Board of Directors on April 17, 2023 and approved by stockholders on June 12, 2

May 8, 2025 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 8, 2025 DELCATH SYSTEMS, INC.

May 8, 2025 EX-99.1

Delcath Systems Reports First Quarter 2025 Results and Business Highlights Conference Call Today at 8:30 a.m. Eastern Time

Exhibit 99.1 Delcath Systems Reports First Quarter 2025 Results and Business Highlights Conference Call Today at 8:30 a.m. Eastern Time QUEENSBURY, NY – May 8, 2025, Delcath Systems, Inc. (Nasdaq: DCTH) (“Delcath” or the “Company”), an interventional oncology company focused on the treatment of primary and metastatic liver cancers, today announced financial results and business highlights for the

May 8, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2025 Or o 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: 001-16133 DE

April 1, 2025 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant x Filed by a Party other than the Registrant o Check the appropriate box: o Preliminary Proxy Statement o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) o Definitive Proxy Statement x Definitive Additional Materials o Soliciting Material Under § 240.

April 1, 2025 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant x Filed by a Party other than the Registrant o Check the appropriate box: o Preliminary Proxy Statement o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) x Definitive Proxy Statement o Definitive Additional Materials o Soliciting Material Under § 240.

March 21, 2025 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 18, 2025 DELCATH SYSTEMS, INC.

March 21, 2025 EX-16.1

Letter from Marcum LLP to the Securities and Exchange Commission dated March 18, 2025.

Exhibit 16.1 March 18, 2025 Securities and Exchange Commission 100 F Street, N.E. Washington, DC 20549 Commissioners: We have read the statements made by Delcath Systems, Inc. under Item 4.01 of its Form 8-K dated March 18, 2025. We agree with the statements concerning our Firm in such Form 8-K; we are not in a position to agree or disagree with other statements of Delcath Systems, Inc. contained

March 6, 2025 EX-19.1

Insider Trading Policy

Delcath Systems, Inc. Policy On Insider Trading Last reviewed: March 1, 2022 In the course of conducting the business of Delcath Systems, Inc. (the "Company"), we may come into possession of material information about the Company or other entities that is not available to the investing public ("material nonpublic information"). You must maintain the confidentiality of material nonpublic informatio

March 6, 2025 EX-21

Subsidiaries of the Company.

Exhibit 21 SUBSIDIARIES OF THE REGISTRANT 1.Delcath Systems Limited, organized under the laws of Ireland. 2.Delcath UK Systems Limited, organized under the laws of England. 3.Delcath Systems GmbH, organized under the laws of Germany. 4.Delcath Systems B.V., organized under the laws of the Netherlands.

March 6, 2025 EX-4.12

Description of Securities.

Exhibit 4.12 DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 The following description of our common stock and preferred stock summarizes the material terms and provisions of our common stock and preferred stock. The following description of our capital stock does not purport to be complete and is subject to, and qualified in its

March 6, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 6, 2025 DELCATH SYSTEMS, INC.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 6, 2025 DELCATH SYSTEMS, INC.

March 6, 2025 EX-99.1

Delcath Systems Reports Fourth Quarter and Full Year 2024 Results Conference Call Today at 8:30 a.m. Eastern Time

Exhibit 99.1 Delcath Systems Reports Fourth Quarter and Full Year 2024 Results Conference Call Today at 8:30 a.m. Eastern Time QUEENSBURY, NY – March 6, 2025, Delcath Systems, Inc. (Nasdaq: DCTH) (“Delcath” or the “Company”), an interventional oncology company focused on the treatment of primary and metastatic cancers of the liver, today reported financial results and business highlights for the f

March 6, 2025 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K x Annual report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the fiscal year ended December 31, 2024 o Transition report pursuant to Secti

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K x Annual report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the fiscal year ended December 31, 2024 o 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: 001-16133 DELCATH SY

January 27, 2025 EX-99.A BD-DIR-RESOL

Joint Filing Agreement

EX-99.A BD-DIR-RESOL 2 exaDCTH13DA.htm Exhibit A Joint Filing Agreement The undersigned hereby agree that this Statement on Schedule 13D/A with respect to the beneficial ownership of shares of Common Stock of Delcath Systems, Inc. is filed jointly, on behalf of each of them. Rosalind Advisors, Inc. By: Name: Steven Salamon Title: President Rosalind Master Fund L.P. By: Name: Mike McDonald Title: D

January 13, 2025 EX-99.2

Forward-Looking Statement The Private Securities Litigation Reform Act of 1995 provides a safe harbor for ability to successfully enter into any necessary purchase and sale agreements with users of forward-looking statements made by the Company or on

Exhibit 99.2 Corporate Presentation NASDAQ: DCTH January 2025 Forward-Looking Statement The Private Securities Litigation Reform Act of 1995 provides a safe harbor for ability to successfully enter into any necessary purchase and sale agreements with users of forward-looking statements made by the Company or on its behalf. This the HEPZATO KIT; the timing and results of the Company’s clinical tria

January 13, 2025 EX-99.1

Delcath Systems Announces Preliminary Fourth Quarter and Full Year 2024 Financial Results Fourth Quarter Revenue Approximately $15.1 Million and Full Year Total Revenue Approximately $37.2 Million

Exhibit 99.1 Delcath Systems Announces Preliminary Fourth Quarter and Full Year 2024 Financial Results Fourth Quarter Revenue Approximately $15.1 Million and Full Year Total Revenue Approximately $37.2 Million QUEENSBURY, NY – January 13, 2025, Delcath Systems, Inc. (Nasdaq: DCTH) (“Delcath” or the “Company”), an interventional oncology company focused on the treatment of primary and metastatic ca

January 13, 2025 8-K

Regulation FD Disclosure, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 13, 2025 DELCATH SYSTEMS, INC.

December 30, 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): December 23, 2024 Delcath Systems

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): December 23, 2024 Delcath Systems, Inc. (Exact name of registrant as specified in its charter) Delaware 001-16133 06-1245881 (State or other jurisdiction of incorporation) (Commission

December 30, 2024 EX-99.1

Delcath Systems Announces Additional $16.3 Million in Funding From Series E and E1 Warrant Exercises

Exhibit 99.1 Delcath Systems Announces Additional $16.3 Million in Funding From Series E and E1 Warrant Exercises QUEENSBURY, NY – December 30, 2024, Delcath Systems, Inc. (Nasdaq: DCTH) (“Delcath” or the “Company”), an interventional oncology company focused on the treatment of primary and metastatic cancers of the liver, today announced the exercise of 1.7 million Series E and E1 warrants which

December 30, 2024 EX-4.1

Form of Amendment of Pre-Funded Warrant (incorporated by reference to Exhibit 4.1 to the Company's Current Report on Form 8-K filed on December 30, 2024).

EX-4.1 Exhibit 4.1 PRE-FUNDED COMMON STOCK PURCHASE WARRANT DELCATH SYSTEMS, INC. Warrant Shares: [•] Issue Date: December 23, 2024 Initial Exercise Date: December 23, 2024 THIS PRE-FUNDED COMMON STOCK PURCHASE WARRANT (the “Warrant”) certifies that, for value received, [•], or its assigns (the “Holder”) is entitled, upon the terms and subject to the limitations on exercise and the conditions here

November 14, 2024 SC 13D/A

DCTH / Delcath Systems, Inc. / Rosalind Advisors, Inc. Activist Investment

SC 13D/A 1 rosalinddcth13da12oct.htm UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D/A (Amendment No. 12) (Rule 13d-101) Under the Securities Exchange Act of 1934 Delcath Systems, Inc. (Name of Issuer) Common Shares (Title of Class of Securities) 24661P807 (CUSIP Number) 566 Queensbury Avenue, Queensbury, New York 12804 (Name, Address and Telephone Number of Pe

November 14, 2024 SC 13D/A

DCTH / Delcath Systems, Inc. / Rosalind Advisors, Inc. Activist Investment

SC 13D/A 1 rosalinddcth13da12oct.htm UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D/A (Amendment No. 12) (Rule 13d-101) Under the Securities Exchange Act of 1934 Delcath Systems, Inc. (Name of Issuer) Common Shares (Title of Class of Securities) 24661P807 (CUSIP Number) 566 Queensbury Avenue, Queensbury, New York 12804 (Name, Address and Telephone Number of Pe

November 14, 2024 SC 13G/A

DCTH / Delcath Systems, Inc. / BIOTECHNOLOGY VALUE FUND L P - AMENDMENT NO. 2 TO SCHEDULE 13G Passive Investment

SC 13G/A 1 sc13ga207422dcth11142024.htm AMENDMENT NO. 2 TO SCHEDULE 13G 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. 2)1 Delcath Systems, Inc. (Name of Issuer) Common Stock, $0.01 par val

November 14, 2024 SC 13G/A

DCTH / Delcath Systems, Inc. / Vivo Opportunity Fund Holdings, L.P. - AMENDMENT NO. 1 TO SCHEDULE 13G Passive Investment

SC 13G/A 1 ea022116108-13ga1vivodelca.htm AMENDMENT NO. 1 TO SCHEDULE 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A UNDER THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 1)* Delcath Systems, Inc. (Name of Issuer) Common Stock, $0.01 par value per share (Title of Class of Securities) 24661P807 (CUSIP Number) September 30, 2024 (Date of Event Which Req

November 14, 2024 EX-99.A BD-DIR-RESOL

Joint Filing Agreement

EX-99.A BD-DIR-RESOL 2 exaDCTH13DA.htm Exhibit A Joint Filing Agreement The undersigned hereby agree that this Statement on Schedule 13D/A with respect to the beneficial ownership of shares of Common Stock of Delcath Systems, Inc. is filed jointly, on behalf of each of them. Rosalind Advisors, Inc. By: Name: Steven Salamon Title: President Rosalind Master Fund L.P. By: Name: Mike McDonald Title: D

November 14, 2024 EX-99.A BD-DIR-RESOL

Joint Filing Agreement

EX-99.A BD-DIR-RESOL 2 exaDCTH13DA.htm Exhibit A Joint Filing Agreement The undersigned hereby agree that this Statement on Schedule 13D/A with respect to the beneficial ownership of shares of Common Stock of Delcath Systems, Inc. is filed jointly, on behalf of each of them. Rosalind Advisors, Inc. By: Name: Steven Salamon Title: President Rosalind Master Fund L.P. By: Name: Mike McDonald Title: D

November 8, 2024 SC 13G/A

DCTH / Delcath Systems, Inc. / HIRSCHMAN ORIN Passive Investment

SC 13G/A 1 formsc13ga.htm UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A Amendment No.1 Under the Securities Exchange Act of 1934 Delcath Systems, Inc. (Name of Issuer) Common Stock, $0.01 par value per share (Title of Class of Securities) 24661P807 (CUSIP Number) November 5, 2024 (Date of Event Which Requires Filing of this Statement) Check the appropriate

November 8, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2024 Or o 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: 001-1613

November 8, 2024 EX-99.1

Delcath Systems Reports Third Quarter 2024 Results and Business Highlights Conference Call Today at 8:30 a.m. Eastern Time

Exhibit 99.1 Delcath Systems Reports Third Quarter 2024 Results and Business Highlights Conference Call Today at 8:30 a.m. Eastern Time QUEENSBURY, NY – November 8, 2024, Delcath Systems, Inc. (Nasdaq: DCTH) (“Delcath” or the “Company”), an interventional oncology company focused on the treatment of primary and metastatic cancers of the liver, today reported financial results and business highligh

November 8, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 8, 2024 DELCATH SYSTEMS, INC.

October 17, 2024 EX-99.1

Delcath Systems Announces Preliminary Third Quarter 2024 Revenue Results $10 Million Quarterly U.S. Revenue Triggers $25 Million Financing Tranche

Exhibit 99.1 Delcath Systems Announces Preliminary Third Quarter 2024 Revenue Results $10 Million Quarterly U.S. Revenue Triggers $25 Million Financing Tranche QUEENSBURY, NY – October 17, 2024, Delcath Systems, Inc. (Nasdaq: DCTH) (“Delcath” or the “Company”), an interventional oncology company focused on the treatment of primary and metastatic cancers of the liver, today announced preliminary re

October 17, 2024 8-K

Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 17, 2024 DELCATH SYSTEMS, INC.

September 26, 2024 424B3

DELCATH SYSTEMS, INC. 2,762,657 Shares of Common Stock

Table of Contents Filed Pursuant to Rule 424(b)(3) Registration No. 333-236100 PROSPECTUS DELCATH SYSTEMS, INC. 2,762,657 Shares of Common Stock This prospectus relates to the re-sale by the selling stockholders identified in this prospectus (each a “Selling Stockholder” and, collectively, the “Selling Stockholders”) of up to an aggregate of 2,762,657 shares of common stock, $0.01 par value per sh

September 26, 2024 424B3

DELCATH SYSTEMS, INC. 1,851,900 Shares of Common Stock Issuable Upon Exercise of Outstanding Series F Warrants 17,456 Shares of Common Stock Issuable Upon Exercise of Outstanding Pre-Funded Warrants

Table of Contents PROSPECTUS Filed Pursuant to Rule 424(b)(3) Registration No. 333-235904 DELCATH SYSTEMS, INC. 1,851,900 Shares of Common Stock Issuable Upon Exercise of Outstanding Series F Warrants 17,456 Shares of Common Stock Issuable Upon Exercise of Outstanding Pre-Funded Warrants This prospectus relates to the offer and sale by us of an aggregate 1,851,900 of our shares of common stock, $0

September 18, 2024 POS AM

As filed with the Securities and Exchange Commission on September 18, 2024

Table of Contents As filed with the Securities and Exchange Commission on September 18, 2024 Registration No.

September 18, 2024 POS AM

Power of Attorney (see signature page to the Existing Registration Statement)

Table of Contents As filed with the Securities and Exchange Commission on September 18, 2024 Registration No.

August 29, 2024 EX-99.1

Delcath Systems, Inc. Announces Positive Results from Independent Study on Liver-Directed Therapy for Uveal Melanoma Patients

Exhibit 99.1 Delcath Systems, Inc. Announces Positive Results from Independent Study on Liver-Directed Therapy for Uveal Melanoma Patients NEW YORK - August 28, 2024 Delcath Systems, Inc. (Nasdaq: DCTH) (the “Company” or “Delcath”), an interventional oncology company focused on the treatment of primary and metastatic cancers of the liver, today announced the publication of a clinical study in the

August 29, 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): August 28, 2024 Delcath Systems,

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 28, 2024 Delcath Systems, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-16133 06-1245881 (State or Other Jurisdiction of Incorporation) (Commission F

August 28, 2024 EX-99.2

Delcath Systems, Inc. Announces Positive Outcomes from Independent Study on Hepatic Perfusion for Uveal Melanoma Patients

EX-99.2 Exhibit 99.2 Delcath Systems, Inc. Announces Positive Outcomes from Independent Study on Hepatic Perfusion for Uveal Melanoma Patients NEW YORK, August 27, 2024—Delcath Systems, Inc. (Nasdaq: DCTH) (the “Company” or “Delcath”), an interventional oncology company specializing in the treatment of primary and metastatic liver cancers, today announced the publication of a retrospective study b

August 28, 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): August 26, 2024 Delcath Systems,

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 26, 2024 Delcath Systems, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-16133 06-1245881 (State or Other Jurisdiction of Incorporation) (Commission F

August 28, 2024 EX-99.1

Delcath Systems, Inc. Announces Promising Results from Independent Study on Repeated Hepatic Chemosaturation for Liver Tumors

EX-99.1 Exhibit 99.1 Delcath Systems, Inc. Announces Promising Results from Independent Study on Repeated Hepatic Chemosaturation for Liver Tumors NEW YORK, August 26, 2024 — Delcath Systems, Inc. (Nasdaq: DCTH) (“Company” or “Delcath”), an interventional oncology company focused on the treatment of primary and metastatic liver cancers, today announced the publication of an independent study condu

August 5, 2024 EX-10.1

Amendment to the License, Supply and Contract Manufacturing Agreement, entered into on April 22, 2024 and effective as of May 1, 2024, by and between the Company and Synerx Pharma, LLC and Mylan Teoranta.

Exhibit 10.1 FIFTH AMENDMENT TO THE LICENSE, SUPPLY AND CONTRACT MANUFACTURING AGREEMENT This Fifth Amendment to the License, Supply, and Contract Manufacturing Agreement ("Fifth Amendment") is made and entered into as of May 1, 2024 ("Fifth Amendment Effective Date") between Synerx Pharma, LLC, a Pennsylvania limited liability company (“Synerx”) and Mylan Teoranta, a limited company formed under

August 5, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2024 Or o 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: 001-16133 DEL

August 5, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 DELCATH SYSTEMS, INC.

August 5, 2024 EX-99.1

Delcath Systems Reports Second Quarter 2024 Results and Business Highlights Company Reports $7.8 million in Quarterly Revenue Conference Call Today at 4:30pm Eastern Time

Exhibit 99.1 Delcath Systems Reports Second Quarter 2024 Results and Business Highlights Company Reports $7.8 million in Quarterly Revenue Conference Call Today at 4:30pm Eastern Time QUEENSBURY, NY – August 5, 2024, Delcath Systems, Inc. (Nasdaq: DCTH) (“Delcath” or the “Company”), an interventional oncology company focused on the treatment of primary and metastatic cancers of the liver, today re

August 1, 2024 CORRESP

Delcath Systems, Inc. 566 Queensbury Avenue, Queensbury, New York 12804

Delcath Systems, Inc. 566 Queensbury Avenue, Queensbury, New York 12804 August 1, 2024 Via EDGAR Securities and Exchange Commission Division of Corporation Finance Office of Industrial Applications and Services 100 F Street, N.E. Washington, D.C. 20549 Attention: Robert Augustin Re: Delcath Systems, Inc. Registration Statement on Form S-3 Filed June 28, 2024 File No. 333-280551 To whom it may conc

July 19, 2024 EX-10.3

Executive Employment Agreement, dated July 17, 2024, by and between Delcath Systems, Inc. and Kevin Muir

Exhibit 10.3 EMPLOYMENT AGREEMENT This Employment Agreement (the “Agreement”) is entered into by and between Delcath Systems, Inc. (“Company”) and the employee whose signature appears below, who is referred to as “Executive.” The Agreement’s Effective Date shall be the date on which the Agreement has been (1) fully executed by the Parties and (2) approved by the Company’s Board of Directors (“Boar

July 19, 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): July 16, 2024 Delcath Systems, In

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 16, 2024 Delcath Systems, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-16133 06-1245881 (State or Other Jurisdiction of Incorporation) (Commission Fil

July 19, 2024 EX-10.2

4, by and between Delcath Systems, Inc. and Sandra Pennell (incorporated by reference

Exhibit 10.2 EMPLOYMENT AGREEMENT This Employment Agreement (the “Agreement”) is entered into by and between Delcath Systems, Inc. (“Company”) and the employee whose signature appears below, who is referred to as “Executive.” The Agreement’s Effective Date shall be the date on which the Agreement has been (1) fully executed by the Parties and (2) approved by the Company’s Board of Directors (“Boar

July 19, 2024 EX-10.1

Executive Employment Agreement dated July 16, 2024, between the Company and Gerard Michel. (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed on July 19, 2024).

Exhibit 10.1 EMPLOYMENT AGREEMENT This Employment Agreement (the “Agreement”) is entered into by and between Delcath Systems, Inc. (“Company”) and the employee whose signature appears below, who is referred to as “Executive.” The Agreement’s Effective Date shall be the date on which the Agreement has been (1) fully executed by the Parties and (2) approved by the Company’s Board of Directors (“Boar

July 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): July 8, 2024 Delcath Systems, Inc

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 8, 2024 Delcath Systems, Inc. (Exact name of registrant as specified in its charter) Delaware 001-16133 06-1245881 (State or other jurisdiction of incorporation) (Commission File

June 28, 2024 S-3

As filed with the Securities and Exchange Commission on June 28, 2024

As filed with the Securities and Exchange Commission on June 28, 2024 Registration No.

June 28, 2024 S-8

As filed with the Securities and Exchange Commission on June 28, 2024

As filed with the Securities and Exchange Commission on June 28, 2024 Registration No.

June 28, 2024 EX-4.1

Form of Indenture

Exhibit 4.1 DELCATH SYSTEMS, INC., Issuer AND [TRUSTEE], Trustee INDENTURE Dated as of [], 20 Debt Securities Table Of Contents Page ARTICLE 1 DEFINITIONS 1 Section 1.01 Definitions of Terms 1 ARTICLE 2 ISSUE, DESCRIPTION, TERMS, EXECUTION, REGISTRATION AND EXCHANGE OF SECURITIES 5 Section 2.01 Designation and Terms of Securities 5 Section 2.02 Form of Securities and Trustee’s Certificate 8 Sectio

June 28, 2024 EX-FILING FEES

Filing Fee Table

Exhibit 107 Calculation of Filing Fee Tables Form S-3 (Form Type) Delcath Systems, Inc.

June 28, 2024 EX-FILING FEES

Calculation of Filing Fee Table

Exhibit 107 Calculation of Filing Fee Table FORM S-8 (Form Type) DELCATH SYSTEMS, INC.

May 29, 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): May 23, 2024 Delcath Systems, Inc

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 23, 2024 Delcath Systems, Inc. (Exact name of registrant as specified in its charter) Delaware 001-16133 06-1245881 (State or other jurisdiction of incorporation) (Commission File

May 29, 2024 EX-99.1

Delcath Systems Announces Appointment of Bridget Martell, MA, MD to Delcath’s Board of Directors

EX-99.1 Exhibit 99.1 Delcath Systems Announces Appointment of Bridget Martell, MA, MD to Delcath’s Board of Directors NEW YORK, May 28, 2024 Delcath Systems, Inc. (Nasdaq: DCTH) (the “Company” or “Delcath”), an interventional oncology company focused on the treatment of primary and metastatic cancers of the liver, is pleased to announce the appointment of Dr. Bridget Martell to the Company’s Board

May 29, 2024 EX-10.1

2020 Omnibus Equity Incentive Plan, as amended

EX-10.1 Exhibit 10.1 DELCATH SYSTEMS, INC. 2020 OMNIBUS EQUITY INCENTIVE PLAN (As adopted by Board of Directors on September 30, 2020 and approved by stockholders on November 23, 2020) (As amended by the Board of Directors on March 30, 2021 and approved by stockholders on May 6, 2021) (As subsequently amended by the Board of Directors on April 17, 2023 and approved by stockholders on June 12, 2023

May 17, 2024 EX-99.A BD-DIR-RESOL

Joint Filing Agreement

Exhibit A Joint Filing Agreement The undersigned hereby agree that this Statement on Schedule 13D/A with respect to the beneficial ownership of shares of Common Stock of Delcath Systems, Inc.

May 17, 2024 SC 13D/A

DCTH / Delcath Systems, Inc. / Rosalind Advisors, Inc. Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D/A (Amendment No. 10) (Rule 13d-101) Under the Securities Exchange Act of 1934 Delcath Systems, Inc. (Name of Issuer) Common Shares (Title of Class of Securities) 24661P807 (CUSIP Number) 566 Queensbury Avenue, Queensbury, New York 12804 (Name, Address and Telephone Number of Person Authorized to Receive Notices an

May 14, 2024 EX-99.1

Delcath Systems Reports First Quarter 2024 Results and Business Highlights Conference Call Today at 8:30am Eastern Time

Exhibit 99.1 Delcath Systems Reports First Quarter 2024 Results and Business Highlights Conference Call Today at 8:30am Eastern Time QUEENSBURY – May 14, 2024, Delcath Systems, Inc. (Nasdaq: DCTH) (“Delcath” or the “Company”), an interventional oncology company focused on the treatment of primary and metastatic cancers of the liver, today reported financial results and business highlights for the

May 14, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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, 2024 DELCATH SYSTEMS, INC.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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, 2024 DELCATH SYSTEMS, INC.

May 14, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2024 Or o 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: 001-16133 DE

May 9, 2024 424B3

1,918,140 Shares of Common Stock Offered by the Selling Stockholders

Table of Contents Filed Pursuant to Rule 424(b)(3) Registration No. 333-278989 1,918,140 Shares of Common Stock Offered by the Selling Stockholders This prospectus relates to the offer and resale, from time to time, by the selling stockholders named under the heading “Selling Stockholders” in this prospectus, or their assigns (the “Selling Stockholders”), of 1,918,140 shares (the “Shares”) of the

May 8, 2024 S-3/A

As filed with the Securities and Exchange Commission on May 8, 2024

S-3/A As filed with the Securities and Exchange Commission on May 8, 2024 Registration No.

May 8, 2024 CORRESP

Delcath Systems, Inc. 566 Queensbury Avenue, Queensbury, New York 12804

Delcath Systems, Inc. 566 Queensbury Avenue, Queensbury, New York 12804 May 8, 2024 Via EDGAR Securities and Exchange Commission Division of Corporation Finance Office of Industrial Applications and Services 100 F Street, N.E. Washington, D.C. 20549 Attention: Juan Grana Re: Delcath Systems, Inc.   Registration Statement on Form S-3 Filed April 29, 2024   File No. 333-278989 To whom it may concern

April 29, 2024 EX-FILING FEES

Filing Fee Table

Exhibit 107 Calculation of Filing Fee Tables S-3 (Form Type) Delcath Systems, Inc.

April 29, 2024 S-3

As filed with the Securities and Exchange Commission on April 29, 2024

Table of Contents As filed with the Securities and Exchange Commission on April 29, 2024 Registration No.

April 26, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 22, 2024 DELCATH SYSTEMS, INC

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 22, 2024 DELCATH SYSTEMS, INC.

April 12, 2024 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant x Filed by a Party other than the Registrant o Check the appropriate box: o Preliminary Proxy Statement o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) x Definitive Proxy Statement o Definitive Additional Materials o Soliciting Material Under § 240.

April 12, 2024 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant x Filed by a Party other than the Registrant o Check the appropriate box: o Preliminary Proxy Statement o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) o Definitive Proxy Statement x Definitive Additional Materials o Soliciting Material Under § 240.

March 26, 2024 EX-21

Subsidiaries of the Compan

Exhibit 21 SUBSIDIARIES OF THE REGISTRANT 1.Delcath Systems Limited, organized under the laws of Ireland. 2.Delcath UK Systems Limited, organized under the laws of England. 3.Delcath Systems GmbH, organized under the laws of Germany. 4.Delcath Systems B.V., organized under the laws of the Netherlands.

March 26, 2024 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K x Annual report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the fiscal year ended December 31, 2023

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K x Annual report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the fiscal year ended December 31, 2023 o 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: 001-16133 DELCATH SY

March 26, 2024 EX-99.1

Delcath Systems Reports Fourth Quarter and Full Year 2023 Results and Provides Business Update Increases 2024 Treatment Site Activation Guidance to 20 Sites

Exhibit 99.1 Delcath Systems Reports Fourth Quarter and Full Year 2023 Results and Provides Business Update Increases 2024 Treatment Site Activation Guidance to 20 Sites QUEENSBURY – March 26, 2024, Delcath Systems, Inc. (Nasdaq: DCTH) (“Delcath” or the “Company”), an interventional oncology company focused on the treatment of primary and metastatic cancers of the liver, today reported recent busi

March 26, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 DELCATH SYSTEMS, INC.

March 26, 2024 EX-97

Delcath Systems, Inc., Incentive Compensation Recoupment Policy (incorporated by reference to Exhibit 97 to the Company's Annual Report on Form 10-K filed March 26, 2024).

Exhibit 97 DELCATH SYSTEMS, INC. Incentive Compensation Recoupment Policy Introduction The Compensation and Stock Option Committee (the “Compensation Committee”) of the Board of Directors (the “Board”) of Delcath Systems, Inc., a Delaware corporation (the “Company”), has determined that it is in the best interests of the Company and its stockholders to adopt this Incentive Compensation Recoupment

March 26, 2024 EX-4.12

Description of Securities

Exhibit 4.12 DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 The following description of our common stock and preferred stock summarizes the material terms and provisions of our common stock and preferred stock. The following description of our capital stock does not purport to be complete and is subject to, and qualified in its

March 25, 2024 EX-99.A BD-DIR-RESOL

Joint Filing Agreement

Exhibit A Joint Filing Agreement The undersigned hereby agree that this Statement on Schedule 13D/A with respect to the beneficial ownership of shares of Common Stock of Delcath Systems, Inc.

March 25, 2024 SC 13D/A

DCTH / Delcath Systems, Inc. / Rosalind Advisors, Inc. Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D/A (Amendment No. 10) (Rule 13d-101) Under the Securities Exchange Act of 1934 Delcath Systems, Inc. (Name of Issuer) Common Shares (Title of Class of Securities) 24661P807 (CUSIP Number) 566 Queensbury Avenue, Queensbury, New York 12804 (Name, Address and Telephone Number of Person Authorized to Receive Notices an

March 19, 2024 EX-10.2

Form of Registration Rights Agreement, dated March 14, 2024, by and among Delcath Systems, Inc. and the persons party thereto

Exhibit 10.2 REGISTRATION RIGHTS AGREEMENT THIS REGISTRATION RIGHTS AGREEMENT (this “Agreement”) is made and entered into as of March 14, 2024, by and between DELCATH SYSTEMS, INC., a Delaware corporation (the “Company”), and each of the several purchasers signatory hereto (each such purchaser, a “Purchaser” and, collectively, the “Purchasers”). This Agreement is made pursuant to the Securities Pu

March 19, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 18, 2024 DELCATH SYSTEMS, INC

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 18, 2024 DELCATH SYSTEMS, INC.

March 19, 2024 EX-4.1

Form of Pre-Funded Warrant

Exhibit 4.1 NEITHER THIS SECURITY NOR THE SECURITIES FOR WHICH THIS SECURITY IS EXERCISABLE HAVE BEEN REGISTERED WITH THE SECURITIES AND EXCHANGE COMMISSION OR THE SECURITIES COMMISSION OF ANY STATE IN RELIANCE UPON AN EXEMPTION FROM REGISTRATION UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), OR UNDER APPLICABLE STATE SECURITIES OR BLUE SKY LAWS. THIS SECURITY AND THE SECURIT

March 19, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 14, 2024 DELCATH SYSTEMS, INC

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 14, 2024 DELCATH SYSTEMS, INC.

March 19, 2024 EX-10.1

Form of Securities Purchase Agreement, dated March 14, 2024, by and among Delcath Systems, Inc. and the persons party thereto

Exhibit 10.1 SECURITIES PURCHASE AGREEMENT THIS SECURITIES PURCHASE AGREEMENT (this “Agreement”) is dated as of March 14, 2024, between DELCATH SYSTEMS, INC., a Delaware corporation (the “Company”), and each purchaser identified on the signature pages hereto (each, including its successors and assigns, a “Purchaser” and collectively, the “Purchasers”). WHEREAS, subject to the terms and conditions

March 19, 2024 EX-99.1

Delcath Systems Announces $7 Million Private Placement

Exhibit 99.1 Delcath Systems Announces $7 Million Private Placement March 15, 2024 NEW YORK, March 15, 2024 /PRNewswire/ — Delcath Systems, Inc. (Nasdaq: DCTH), an interventional oncology company focused on the treatment of primary and metastatic cancers of the liver, today announced that it has entered into a securities purchase agreement with certain accredited investors comprised of existing in

March 19, 2024 EX-99.1

Delcath Systems Appoints Martha S. Rook as Chief Operating Officer

Exhibit 99.1 Delcath Systems Appoints Martha S. Rook as Chief Operating Officer Delcath Systems, Inc. (Nasdaq: DCTH) (the “Company” or “Delcath”), an interventional oncology company focused on the treatment of primary and metastatic cancers of the liver, is pleased to announce the appointment of Martha S. Rook as its new Chief Operating Officer (COO). Martha S. Rook, Ph.D., is an experienced indus

February 14, 2024 SC 13G/A

DCTH / Delcath Systems, Inc. / BIOTECHNOLOGY VALUE FUND L P - AMENDMENT NO. 1 TO SCHEDULE 13G Passive Investment

SC 13G/A 1 sc13ga107422dcth02142024.htm AMENDMENT NO. 1 TO SCHEDULE 13G 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 Delcath Systems, Inc. (Name of Issuer) Common Stock, $0.01 par val

February 14, 2024 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 9, 2024 DELCATH SYSTEMS, INC.

February 13, 2024 SC 13G/A

DCTH / Delcath Systems, Inc. / Stonepine Capital Management, LLC Passive Investment

SC 13G/A 1 dcth13ga.htm UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1)* Delcath Systems, Inc. (Name of Issuer) Common Stock, $0.01 par value per share (Title of Class of Securities) 24661P807 (CUSIP Number) December 31, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate

February 13, 2024 SC 13G/A

DCTH / Delcath Systems, Inc. / Vivo Opportunity Fund Holdings, L.P. - AMENDMENT NO. 1 TO SCHEDULE 13G Passive Investment

SC 13G/A 1 ea193540-13ga1vivodelcath.htm AMENDMENT NO. 1 TO SCHEDULE 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A UNDER THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 1)* Delcath Systems, Inc. (Name of Issuer) Common Stock, $0.01 par value per share (Title of Class of Securities) 24661P807 (CUSIP Number) December 31, 2023 (Date of Event Which Requi

February 2, 2024 SC 13G/A

DCTH / Delcath Systems, Inc. / Soleus Capital Master Fund, L.P. - AMENDMENT NO. 1 TO SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1)* Delcath Systems, Inc. (Name of Issuer) Common Stock, par value $0.01 per share (Title of Class of Securities) 24661P807 (CUSIP Number) December 31, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the ru

January 31, 2024 EX-99.1

Delcath Systems Receives Permanent

EX-99.1 Exhibit 99.1 Delcath Systems Receives Permanent J-Code (J9248) for HEPZATO™ (melphalan/Hepatic Delivery System) Effective April 1, 2024 NEWS PROVIDED BY Delcath Systems, Inc. ☐ 31 Jan, 2024, 08:00 ET NEW YORK, Jan. 31, 2024 /PRNewswire/ — Delcath Systems, Inc. (Nasdaq: DCTH), an interventional oncology company focused on the treatment of primary and metastatic cancers of the liver, today a

January 31, 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 31, 2024 DELCATH SYSTEMS,

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 31, 2024 DELCATH SYSTEMS, INC. (Exact name of registrant as specified in its charter) Delaware 001-16133 06-1245881 (State or other jurisdiction of incorporation) (Commission

January 9, 2024 SC 13G

DCTH / Delcath Systems, Inc. / HIRSCHMAN ORIN Passive Investment

SC 13G 1 formsc13g.htm UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 Delcath Systems, Inc. (Name of Issuer) Common Stock, $0.01 par value per share (Title of Class of Securities) 24661P807 (CUSIP Number) December 27, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate th

January 8, 2024 EX-99.1

Table of Contents Forward-Looking Statement 3 Investment Summary 4 Unmet Need: Liver-Dominant Cancers 5 HEPZATO KIT™ 8 Metastatic Uveal Melanoma (mUM) 11 FOCUS Trial 16 HEPZATO KIT: Commercialization 20 Reimbursement & Pricing 25 Next Steps: Future I

EX-99.1 Exhibit 99.1 Corporate Presentation NASDAQ: DCTH January 2024 Table of Contents Forward-Looking Statement 3 Investment Summary 4 Unmet Need: Liver-Dominant Cancers 5 HEPZATO KIT™ 8 Metastatic Uveal Melanoma (mUM) 11 FOCUS Trial 16 HEPZATO KIT: Commercialization 20 Reimbursement & Pricing 25 Next Steps: Future Indications 30 References 39 2 Forward-Looking Statement The Private Securities L

January 8, 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 5, 2024 DELCATH SYSTEMS,

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 5, 2024 DELCATH SYSTEMS, INC. (Exact name of registrant as specified in its charter) Delaware 001-16133 06-1245881 (State or other jurisdiction of incorporation) (Commission F

December 15, 2023 EX-99.4

Form of Off-Plan Inducement Award Stock Option Award Agreement (incorporated by reference to Exhibit 99.4 to the Company

EX-99.4 Exhibit 99.4 DELCATH SYSTEMS, INC. INDUCEMENT AWARD STOCK OPTION AGREEMENT (Non-Qualified Stock Option) THIS INDUCEMENT AWARD STOCK OPTION AWARD AGREEMENT (this “Agreement”) is made as of the Date of Award (the “Grant Date”), as defined under the Notice of Inducement Award, by and between Delcath Systems, Inc., a Delaware corporation (the “Company”), and the Recipient (the “Optionee”). The

December 15, 2023 EX-FILING FEES

Filing Fee Table

EX-FILING FEES Exhibit 107 CALCULATION OF FILING FEE TABLE Form S-8 Delcath Systems, Inc.

December 15, 2023 S-8

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

S-8 As filed with the Securities and Exchange Commission on December 15, 2023 Registration No.

December 15, 2023 EX-99.3

Form of Inducement Awards Stock Option Award Agreement (incorporated by reference to Exhibit 99.3 to the Company

Exhibit 99.3 DELCATH SYSTEMS, INC. 2023 INDUCEMENT PLAN STOCK OPTION AGREEMENT THIS STOCK OPTION AGREEMENT is made as of the Date of Grant (the “Grant Date”), as defined under the Stock Option Grant Notice (the “Grant Notice”), by and between Delcath Systems, Inc., a Delaware corporation (the “Company”), and the Participant (the “Optionee”). The parties hereto agree as follows: 1. Inducement Award

December 15, 2023 EX-99.2

s Registration Statement on Form S-8 filed with the Commission on December 15, 2023).

EX-99.2 Exhibit 99.2 DELCATH SYSTEMS, INC. 2023 INDUCEMENT PLAN (As adopted by Board of Directors on December 5, 2023) 1. General. (a) Eligible Award Recipients. The only persons eligible to receive grants of Awards under this Plan are individuals who satisfy the standards for inducement grants under Nasdaq Marketplace Rule 5635(c)(4) or 5635(c)(3), if applicable, and the related guidance under Na

November 28, 2023 EX-99.A BD-DIR-RESOL

Joint Filing Agreement

EX-99.A BD-DIR-RESOL 2 exaDCTH13DA9Nov23.htm ROSALINDADVISORSEXA Exhibit A Joint Filing Agreement The undersigned hereby agree that this Statement on Schedule 13D/A with respect to the beneficial ownership of shares of Common Stock of Delcath Systems, Inc. is filed jointly, on behalf of each of them. Rosalind Advisors, Inc. By: Name: Steven Salamon Title: President Rosalind Master Fund L.P. By: Na

November 28, 2023 SC 13D/A

DCTH / Delcath Systems Inc / Rosalind Advisors, Inc. - ROSALINDADVISORS13DA09 Activist Investment

SC 13D/A 1 rosalinddcth13da9nov2023.htm ROSALINDADVISORS13DA09 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D/A (Amendment No. 9) (Rule 13d-101) Under the Securities Exchange Act of 1934 Delcath Systems, Inc. (Name of Issuer) Common Shares (Title of Class of Securities) 24661P807 (CUSIP Number) 1633 Broadway,22nd Floor, Suite C, New York, NY 10019 (Name, Addre

November 13, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 13, 2023 DELCATH SYSTEMS,

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 13, 2023 DELCATH SYSTEMS, INC.

November 13, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2023 Or o 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: 001-1613

November 13, 2023 EX-99.1

Delcath Systems Reports Third Quarter 2023 Results and Provides Business Update

Exhibit 99.1 Delcath Systems Reports Third Quarter 2023 Results and Provides Business Update NEW YORK – November 13, 2023, Delcath Systems, Inc. (Nasdaq: DCTH) (“Delcath” or the “Company”), an interventional oncology company focused on the treatment of primary and metastatic cancers of the liver, today reported business highlights and financial results for the third quarter ended September 30, 202

September 6, 2023 EX-99.1

The Private Securities Litigation Reform Act of 1995 provides a safe harbor for forward-looking statements made by the Company or on its behalf. This presentation contains forward-looking statements, which are subject to certain risks and uncertainti

EX-99.1 Corporate Presentation (NASDAQ: DCTH) September 6, 2023 1 Exhibit 99.1 The Private Securities Litigation Reform Act of 1995 provides a safe harbor for forward-looking statements made by the Company or on its behalf. This presentation contains forward-looking statements, which are subject to certain risks and uncertainties that can cause actual results to differ materially from those descri

September 6, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 6, 2023 DELCATH SYSTEMS,

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 6, 2023 DELCATH SYSTEMS, INC.

September 1, 2023 424B3

Up to 19,509,302 Shares of Common Stock Offered by the Selling Stockholders

Filed Pursuant to Rule 424(b)(3) Registration No. 333-272659 PROSPECTUS SUPPLEMENT NO. 1 (To Prospectus Dated June 28, 2023) Up to 19,509,302 Shares of Common Stock Offered by the Selling Stockholders This Prospectus Supplement No. 1 (this “Prospectus Supplement”) is being filed to update and supplement the information contained in the “Selling Stockholders” section of the Delcath Systems, Inc. (t

August 16, 2023 SC 13G

DCTH / Delcath Systems Inc / Soleus Capital Master Fund, L.P. - 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. )* Delcath Systems, Inc. (Name of Issuer) Common Stock, par value $0.01 per share (Title of Class of Securities) 24661P807 (CUSIP Number) August 15, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate th

August 16, 2023 EX-99.A

JOINT FILING AGREEMENT

EX-99.A EXHIBIT A JOINT FILING AGREEMENT Soleus Capital Master Fund, L.P., a Cayman Islands exempted limited partnership, Soleus Capital, LLC, a Delaware limited liability company, Soleus Capital Group, LLC, a Delaware limited liability company, and Guy Levy, an individual, hereby agree to file jointly the statement on Schedule 13G to which this Joint Filing Agreement is attached, and any amendmen

August 15, 2023 EX-99.2

Forward-looking Statements The Private Securities Litigation Reform Act of 1995 provides a safe harbor for forward-looking statements made by the Company or on its behalf. This presentation contains forward-looking statements, which are subject to ce

EX-99.2 Exhibit 99.2 Corporate Presentation (NASDAQ: DCTH) August 14, 2023 1 Forward-looking Statements The Private Securities Litigation Reform Act of 1995 provides a safe harbor for forward-looking statements made by the Company or on its behalf. This presentation contains forward-looking statements, which are subject to certain risks and uncertainties that can cause actual results to differ mat

August 15, 2023 EX-99.1

Delcath Systems, Inc. Announces FDA Approval of HEPZATO KIT

EX-99.1 Exhibit 99.1 Delcath Systems, Inc. Announces FDA Approval of HEPZATO KIT™ for the Treatment of Adult Patients with Unresectable Hepatic-Dominant Metastatic Uveal Melanoma HEPZATO KIT is the only FDA approved liver-directed therapy to treat metastatic uveal melanoma Approval includes treatment naïve and previously treated patients and is not limited by HLA genotype Delcath to hold Business

August 15, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 14, 2023 DELCATH SYSTEMS, INC.

August 9, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 9, 2023 DELCATH SYSTEMS, INC

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 9, 2023 DELCATH SYSTEMS, INC.

August 9, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2023 Or o 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: 001-16133 DEL

August 9, 2023 EX-99.1

Delcath Systems Reports Second Quarter 2023 Results and Provides Business Update

Exhibit 99.1 Delcath Systems Reports Second Quarter 2023 Results and Provides Business Update NEW YORK – August 9, 2023 Delcath Systems, Inc. (Nasdaq: DCTH) (“Delcath” or the “Company”), an interventional oncology company focused on the treatment of primary and metastatic cancers of the liver, today reported business highlights and financial results for the second quarter ended June 30, 2023. Rece

August 4, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 4, 2023 DELCATH SYSTEMS, INC

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 4, 2023 DELCATH SYSTEMS, INC.

June 28, 2023 424B3

Up to 19,509,749 Shares of Common Stock Offered by the Selling Stockholders

424B3 Table of Contents Filed Pursuant to Rule 424(b)(3) Registration No. 333-272659 Up to 19,509,749 Shares of Common Stock Offered by the Selling Stockholders This prospectus relates to the offer and resale, from time to time, by the selling stockholders named under the heading “Selling Stockholders” in this prospectus, or their assigns (the “Selling Stockholders”), of up to 19,509,749 shares (t

June 26, 2023 CORRESP

Delcath Systems, Inc. 1633 Broadway, Suite 22C New York, New York 10019

CORRESP Delcath Systems, Inc. 1633 Broadway, Suite 22C New York, New York 10019 June 26, 2023 Via EDGAR Securities and Exchange Commission Division of Corporation Finance Office of Industrial Applications and Services 100 F Street, N.E. Washington, D.C. 20549 Attention: Jane Park Re: Delcath Systems, Inc. Registration Statement on Form S-3 Filed June 15, 2023 File No. 333-272659 To whom it may con

June 26, 2023 SC 13G

DCTH / Delcath Systems Inc / Stonepine Capital Management, LLC Passive Investment

SC 13G 1 dcth13g.htm UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* Delcath Systems, Inc. (Name of Issuer) Common Stock, $0.01 par value per share (Title of Class of Securities) 24661P807 (CUSIP Number) June 12, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to

June 22, 2023 SC 13G

DCTH / Delcath Systems Inc / BIOTECHNOLOGY VALUE FUND L P - 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 Delcath Systems, Inc. (Name of Issuer) Common Stock, $0.01 par value per share (Title of Class of Securities) 24661P807 (CUSIP Number) June

June 22, 2023 EX-99.1

Delcath Systems Reports Inducement Grants Under Nasdaq Listing Rule 5635(c)(4)

EX-99.1 Exhibit 99.1 Delcath Systems Reports Inducement Grants Under Nasdaq Listing Rule 5635(c)(4) NEW YORK, June 21, 2023 /PRNewswire/ Delcath Systems, Inc. (Nasdaq: DCTH) (the “Company” or “Delcath”), an interventional oncology company focused on the treatment of primary and metastatic cancers of the liver, announces that the Company granted equity awards, previously approved by the Company’s C

June 22, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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): June 21, 2023 DELCATH SYSTEMS, INC.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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): June 21, 2023 DELCATH SYSTEMS, INC.

June 22, 2023 SC 13G

DCTH / Delcath Systems Inc / Vivo Opportunity Fund Holdings, L.P. - SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G UNDER THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. )* Delcath Systems, Inc. (Name of Issuer) Common Stock, $0.01 par value per share (Title of Class of Securities) 24661P807 (CUSIP Number) June 12, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pu

June 22, 2023 EX-99.1

Joint Filing Statement

EXHIBIT 99.1 Joint Filing Agreement 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 shall be filed on behalf of each of the undersigned without the necessity of filing additional joint filing statements. The undersigned acknowledge that each shall be

June 22, 2023 EX-99.1

Joint Filing Agreement

Exhibit 99.1 Joint Filing Agreement The undersigned hereby agree that the Statement on Schedule 13G dated June 22, 2023 with respect to the Common Stock, $0.01 par value per share, of Delcath Systems, Inc., a Delaware corporation, and any further amendments thereto executed by each and any of the undersigned shall be filed on behalf of each of the undersigned pursuant to and in accordance with the

June 15, 2023 EX-FILING FEES

Filing Fee Table

EX-FILING FEES Exhibit 107 Calculation of Filing Fee Tables S-3 (Form Type) Delcath Systems, Inc.

June 15, 2023 S-3

As filed with the Securities and Exchange Commission on June 14, 2023

S-3 Table of Contents As filed with the Securities and Exchange Commission on June 14, 2023 Registration No.

June 13, 2023 EX-3.1

Certificate of Amendment to the Amended and Restated Certificate of Incorporation of the Company, dated June 12, 2023 (incorporated by reference to Exhibit 3.1 to the Company’s Current Report on Form 8-K filed on June 13, 2023).

EX-3.1 Exhibit 3.1 CERTIFICATE OF AMENDMENT TO THE AMENDED AND RESTATED CERTIFICATE OF INCORPORATION OF DELCATH SYSTEMS, INC. Pursuant to Section 242 of the General Corporation Law of the State of Delaware Delcath Systems, Inc., a Delaware corporation (hereinafter called the “Corporation”), does hereby certify: FIRST: Upon the filing and effectiveness pursuant to the General Corporation Law of the

June 13, 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): June 12, 2023 Delcath Systems, In

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): June 12, 2023 Delcath Systems, Inc. (Exact name of registrant as specified in its charter) Delaware 001-16133 06-1245881 (State or other jurisdiction of incorporation) (Commission Fil

June 13, 2023 EX-10.1

2020 Omnibus Equity Incentive Plan, as amended

EX-10.1 Exhibit 10.1 DELCATH SYSTEMS, INC. 2020 OMNIBUS EQUITY INCENTIVE PLAN (As adopted by Board of Directors on September 30, 2020 and approved by stockholders on November 23, 2020) (As amended by the Board of Directors on March 30, 2021 and approved by stockholders on May 6, 2021) (As subsequently amended by the Board of Directors on April 17, 2023, and approved by stockholders on June 12, 202

June 7, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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): June 1, 2023 DELCATH SYSTEMS, INC.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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): June 1, 2023 DELCATH SYSTEMS, INC.

June 7, 2023 EX-99.1

Delcath Systems Announces Sandra Pennell as Senior Vice President of Finance

EX-99.1 Exhibit 99.1 Delcath Systems Announces Sandra Pennell as Senior Vice President of Finance NEW YORK, June 7, 2023 Delcath Systems, Inc. (Nasdaq: DCTH) (the “Company” or “Delcath”), an interventional oncology company focused on the treatment of primary and metastatic cancers of the liver, is pleased to announce that the Company has appointed Sandra Pennell as its new Senior Vice President of

May 22, 2023 EX-10.3

First Amendment to Loan Documents issued by the Company to Avenue Venture Opportunities Fund, L.P., dated March 31, 2023.

EX-10.3 Exhibit 10.3 FIRST AMENDMENT TO LOAN DOCUMENTS This First Amendment to Loan Documents (this “Amendment”) is entered into as of March 31, 2023, by and among AVENUE VENTURE OPPORTUNITIES FUND, L.P., a Delaware limited partnership (“Lender”) and DELCATH SYSTEMS, INC., a Delaware corporation (“Borrower”). RECITALS Borrower, Agent and Lender are parties to those certain Loan Documents, dated as

May 22, 2023 EX-3.6

Amended and Restated By-Laws of the Company.

EX-3.6 Exhibit 3.6 AMENDED AND RESTATED BY-LAWS OF DELCATH SYSTEMS, INC. A Delaware Corporation ARTICLE I MEETINGS OF STOCKHOLDERS Section 1. Annual Meeting. A meeting of stockholders shall be held annually for the election of directors and the transaction of such other business as may properly come before the meeting. Such meeting shall be held at such time and at such place either within or with

May 22, 2023 EX-4.5

Warrant to Purchase Shares, dated March 31, 2023 issued by the Company to Avenue Venture Opportunities Fund, L.P.

EX-4.5 Exhibit 4.5 THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO, OR IN CONNECTION WITH, THE SALE AND DISTRIBUTION THEREOF, AND HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”) OR ANY STATE SECURITIES LAWS. SUCH SECURITIES MAY NOT BE SOLD OR TRANSFERRED IN THE ABSENCE OF (A) SUCH REGISTRATION, (B)

May 22, 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 March 31, 2023 Or ☐ TRANSITION REPORT PURSUANT

Table of Contents 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 31, 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: 001-16133 DE

May 12, 2023 EX-99.1

Delcath Systems Provides Business Update and Reports Preliminary First Quarter 2023 Financial Results

EX-99.1 Exhibit 99.1 Delcath Systems Provides Business Update and Reports Preliminary First Quarter 2023 Financial Results NEW YORK – May 12, 2023, Delcath Systems, Inc. (Nasdaq: DCTH) (Delcath or the “Company”), an interventional oncology company focused on the treatment of primary and metastatic cancers of the liver, today reported business highlights and certain preliminary financial results fo

May 12, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 12, 2023 DELCATH SYSTEMS, INC.

May 12, 2023 NT 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 12b-25 NOTIFICATION OF LATE FILING (Check One): ☐ Form 10-K ☐ Form 20-F ☐ Form 11-K ☒ Form 10-Q ☐ Form 10-D ☐ Form N-CEN ☐ Form N-CSR For Period Ended: March 31, 2023 ☐ Tran

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 12b-25 NOTIFICATION OF LATE FILING (Check One): ☐ Form 10-K ☐ Form 20-F ☐ Form 11-K ☒ Form 10-Q ☐ Form 10-D ☐ Form N-CEN ☐ Form N-CSR For Period Ended: March 31, 2023 ☐ Transition Report on Form 10-K ☐ Transition Report on Form 20-F ☐ Transition Report on Form 11-K ☐ Transition Report on Form 10-K ☐ Transition Report on F

May 1, 2023 DEF 14A

definitive proxy statement

DEF 14A Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION 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)) ☒ Definitive Proxy Statement ☐ Definitive Additional Materials ☐ Soliciting Material Under § 240.

May 1, 2023 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

DEFA14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION 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)) ☐ Definitive Proxy Statement ☒ Definitive Additional Materials ☐ Soliciting Material Under § 240.

April 21, 2023 PRE 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

PRE 14A Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION 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)) ☐ Definitive Proxy Statement ☐ Definitive Additional Materials ☐ Soliciting Material Under § 240.

March 30, 2023 EX-4.4

Form of Common Tranche B Warrant

EX-4.4 6 d377148dex44.htm EX-4.4 Exhibit 4.4 NEITHER THESE SECURITIES NOR THE SECURITIES ISSUABLE UPON EXERCISE OF THESE SECURITIES HAVE BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), OR APPLICABLE STATE SECURITIES LAWS. THE SECURITIES AND THE SECURITIES ISSUABLE UPON EXERCISE OF THESE SECURITIES MAY NOT BE OFFERED FOR SALE, SOLD, TRANSFERRED OR ASSIGNED (I) I

March 30, 2023 EX-3.1

Certificate of Designation of Preference, Rights and Limitations of the Series F Convertible Voting Preferred Stock (incorporated by reference to Exhibit 3.1 to the Company

EX-3.1 Exhibit 3.1 DELCATH SYSTEMS, INC. CERTIFICATE OF DESIGNATION OF PREFERENCES, RIGHTS AND LIMITATIONS OF SERIES F CONVERTIBLE VOTING PREFERRED STOCK PURSUANT TO SECTION 151 OF THE DELAWARE GENERAL CORPORATION LAW DELCATH SYSTEMS, INC., a Delaware corporation (the “Corporation”), in accordance with the provisions of Section 103 of the Delaware General Corporation Law (the “DGCL”) does hereby c

March 30, 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): March 27, 2023 DELCATH SYSTEMS, I

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 27, 2023 DELCATH SYSTEMS, INC. (Exact name of registrant as specified in its charter) Delaware 001-16133 08-1245881 (State or other jurisdiction of incorporation) (Commission Fi

March 30, 2023 EX-4.2

Form of Preferred Tranche B Warrant

EX-4.2 Exhibit 4.2 NEITHER THESE SECURITIES NOR THE SECURITIES ISSUABLE UPON CONVERSION OR EXERCISE OF THESE SECURITIES HAVE BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), OR APPLICABLE STATE SECURITIES LAWS. THE SECURITIES AND THE SECURITIES ISSUABLE UPON CONVERSION OR EXERCISE OF THESE SECURITIES MAY NOT BE OFFERED FOR SALE, SOLD, TRANSFERRED OR ASSIGNED (I)

March 30, 2023 EX-99.2

Delcath Systems Announces Closing of Private Placement of up to $85 Million

EX-99.2 Exhibit 99.2 Delcath Systems Announces Closing of Private Placement of up to $85 Million Led by Vivo Capital with participation from Logos Capital, BVF Partners LP, Stonepine Capital Management, LLC, Serrado Capital LLC and supported by existing investor, Rosalind Advisors $25 million financing upfront with up to an additional $60 million tied to satisfaction of milestones Aggregate financ

March 30, 2023 EX-99.1

Delcath Systems Announces up to $85 Million Financing

EX-99.1 Exhibit 99.1 Delcath Systems Announces up to $85 Million Financing Led by Vivo Capital with participation from Logos Capital, BVF Partners, Stonepine Capital Management, LLC, Serrado Capital and supported by existing investor, Rosalind Advisors $25 million financing upfront with up to an additional $60 million tied to satisfaction of milestones Aggregate financing is sufficient to fund Com

March 30, 2023 EX-10.2

Form of Securities Purchase Agreement, dated March 27, 2023, by and between Delcath Systems, Inc. and the purchaser named therein

EX-10.2 Exhibit 10.2 SECURITIES PURCHASE AGREEMENT This Securities Purchase Agreement (this “Agreement”) is dated as of March 27, 2023, by and among Delcath Systems, Inc., a Delaware corporation (the “Company”), and each purchaser identified on the signature pages hereto (each, including its successors and assigns, a “Purchaser” and collectively, the “Purchasers”). RECITALS A. The Company and each

March 30, 2023 EX-4.3

Form of Common Tranche A Warrant

EX-4.3 Exhibit 4.3 NEITHER THESE SECURITIES NOR THE SECURITIES ISSUABLE UPON EXERCISE OF THESE SECURITIES HAVE BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), OR APPLICABLE STATE SECURITIES LAWS. THE SECURITIES AND THE SECURITIES ISSUABLE UPON EXERCISE OF THESE SECURITIES MAY NOT BE OFFERED FOR SALE, SOLD, TRANSFERRED OR ASSIGNED (I) IN THE ABSENCE OF (A) AN EF

March 30, 2023 EX-10.1

Form of Securities Purchase Agreement, dated March 27, 2023, by and among Delcath Systems, Inc. and the purchasers named therein

EX-10.1 Exhibit 10.1 SECURITIES PURCHASE AGREEMENT This Securities Purchase Agreement (this “Agreement”) is dated as of March 27, 2023, by and among Delcath Systems, Inc., a Delaware corporation (the “Company”), and each purchaser identified on the signature pages hereto (each, including its successors and assigns, a “Purchaser” and collectively, the “Purchasers”). RECITALS A. The Company and each

March 30, 2023 EX-4.1

Form of Preferred Tranche A Warrant

EX-4.1 Exhibit 4.1 NEITHER THESE SECURITIES NOR THE SECURITIES ISSUABLE UPON CONVERSION OR EXERCISE OF THESE SECURITIES HAVE BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), OR APPLICABLE STATE SECURITIES LAWS. THE SECURITIES AND THE SECURITIES ISSUABLE UPON CONVERSION OR EXERCISE OF THESE SECURITIES MAY NOT BE OFFERED FOR SALE, SOLD, TRANSFERRED OR ASSIGNED (I)

March 28, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 27, 2023 DELCATH SYSTEMS, INC

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 27, 2023 DELCATH SYSTEMS, INC.

March 28, 2023 EX-99.1

Executive Summary Delcath aims to be the leader in targeted, safe and highly-effective minimally-invasive treatments for patients with cancers of the liver. UNMET NEED HEPATIC DELIVERY COMPANY & LARGE MARKET CLINICAL PROGRAM LIVER CANCER SYSTEM (HDS)

EX-99.1 Exhibit 99.1 Corporate Presentation (NASDAQ: DCTH) March 26, 2023 Forward-looking Statements The Private Securities Litigation Reform Act of 1995 provides a safe harbor for forward-looking statements made by the Company or on its behalf. This news release contains forward-looking statements, which are subject to certain risks and uncertainties that can cause actual results to differ materi

March 27, 2023 EX-99.1

Delcath Systems Announces up to $85 Million Financing

EX-99.1 Exhibit 99.1 Delcath Systems Announces up to $85 Million Financing Led by Vivo Capital with participation from Logos Capital, BVF Partners LP, Stonepine Capital Management, LLC, Serrado Capital LLC and supported by existing investor, Rosalind Advisors $25 million financing upfront with up to an additional $60 million tied to satisfaction of milestones Aggregate financing expected to be suf

March 27, 2023 10-K

Form 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHA N GE COMMISSION WASHINGTON, D.

March 27, 2023 EX-21

Subsidiaries of the Company

EX-21 EXHIBIT 21 SUBSIDIARIES OF THE REGISTRANT 1. Delcath Holdings Limited, organized under the laws of Ireland. 2. Delcath Systems Limited, organized under the laws of Ireland. 3. Delcath UK Systems Limited, organized under the laws of England. 4. Delcath Systems GmbH, organized under the laws of Germany. 5. Delcath Systems B.V., organized under the laws of the Netherlands.

March 27, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 27, 2023 DELCATH SYSTEMS, INC

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 27, 2023 DELCATH SYSTEMS, INC.

March 27, 2023 EX-4.12

Description of Securities

EX-4.12 EXHIBIT 4.12 DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 The following description of our common stock and preferred stock summarizes the material terms and provisions of our common stock and preferred stock. The following description of our capital stock does not purport to be complete and is subject to, and qualified

February 27, 2023 424B5

Up to $17,000,000 Common Stock

424B5 Filed pursuant to Rule 424(b)(5) Registration No. 333-257428 Prospectus Supplement (To Prospectus Supplement dated November 9, 2021) Up to $17,000,000 Common Stock This prospectus supplement amends and supplements the information in the prospectus supplement, dated November 9, 2021, filed with the Securities and Exchange Commission as a part of our registration statement on Form S-3 (File No

February 24, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 24, 2023 DELCATH SYSTEMS,

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 24, 2023 DELCATH SYSTEMS, INC.

February 14, 2023 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 14, 2023 DELCATH SYSTEMS, INC.

February 14, 2023 EX-99.1

Delcath Systems Announces New Drug Application Resubmission for HEPZATO Kit

Exhibit 99.1 Delcath Systems Announces New Drug Application Resubmission for HEPZATO Kit NEW YORK, February 14, 2023/PRNewswire/ - Delcath Systems, Inc. (Nasdaq: DCTH), an interventional oncology company focused on the treatment of primary and metastatic cancers of the liver, announced it submitted a new drug application (NDA) resubmission to the US Food and Drug Administration (FDA) for the HEPZA

January 23, 2023 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 20, 2023 DELCATH SYSTEMS, INC.

January 20, 2023 424B3

Up to 2,140,931 Shares of Common Stock Offered by the Selling Stockholders

Table of Contents Filed Pursuant to Rule 424(b)(3) Registration No. 333-269173 Up to 2,140,931 Shares of Common Stock Offered by the Selling Stockholders This prospectus relates to the offer and resale, from time to time, by the selling stockholders named under the heading “Selling Stockholders” in this prospectus, or their assigns (the “Selling Stockholders”), of up to 2,140,931 shares of the Com

January 18, 2023 CORRESP

Delcath Systems, Inc. 1633 Broadway, Suite 22C New York, New York 10019

CORRESP 1 filename1.htm Delcath Systems, Inc. 1633 Broadway, Suite 22C New York, New York 10019 January 18, 2023 Via EDGAR Securities and Exchange Commission Division of Corporation Finance Office of Industrial Applications and Services 100 F Street, N.E. Washington, D.C. 20549 Attention: Benjamin Ritchie Re: Delcath Systems, Inc. Registration Statement on Form S-3 Filed January 10, 2023 File No.

January 10, 2023 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 10, 2023 DELCATH SYSTEMS, INC.

January 10, 2023 EX-FILING FEES

Filing Fee Table

Exhibit 107 Calculation of Filing Fee Tables S-3 (Form Type) Delcath Systems, Inc.

January 10, 2023 S-3

As filed with the Securities and Exchange Commission on January 10, 2023

S-3 Table of Contents As filed with the Securities and Exchange Commission on January 10, 2023 Registration No.

January 3, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 3, 2023 DELCATH SYSTEMS, IN

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 3, 2023 DELCATH SYSTEMS, INC.

January 3, 2023 EX-99.1

The Private Securities Litigation Reform Act of 1995 provides a safe harbor for forward-looking statements made by the Company or on its behalf. This presentation contains forward-looking statements, which are subject to certain risks and uncertainti

EX-99.1 Corporate Presentation (NASDAQ: DCTH) January 2023 Exhibit 99.1 The Private Securities Litigation Reform Act of 1995 provides a safe harbor for forward-looking statements made by the Company or on its behalf. This presentation contains forward-looking statements, which are subject to certain risks and uncertainties that can cause actual results to differ materially from those described. Fa

December 29, 2022 SC 13G/A

DCTH / Delcath Systems Inc / Flynn James E Passive Investment

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.

December 21, 2022 EX-99.A BD-DIR-RESOL

Joint Filing Agreement

Exhibit A Joint Filing Agreement The undersigned hereby agree that this Statement on Schedule 13G/A with respect to the beneficial ownership of shares of Common Stock of Delcath Systems, Inc.

December 21, 2022 SC 13D/A

DCTH / Delcath Systems Inc / Rosalind Advisors, Inc. - DELCATH SC 13 D/A 8 Activist Investment

SC 13D/A delcath13da8.htm SC 13D/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D/A (Amendment No. 8) (Rule 13d-101) Under the Securities Exchange Act of 1934 Delcath Systems, Inc. (Name of Issuer) Common Shares (Title of Class of Securities) 24661P807 (CUSIP Number) 1633 Broadway,22nd Floor, Suite C, New York, NY 10019 (Name, Address and Telephone Number of P

December 16, 2022 SC 13D/A

DCTH / Delcath Systems Inc / MICHEL GERARD J - SC 13D/A Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 1)* Delcath Systems, Inc. (Name of Issuer) Common Stock, par value $0.01 per share (Title of Class of Securities) 24661P807 (CUSIP Number) McCarter & English, LLP Four Gateway Center 100 Mulberry Street Newark, New Jersey 07102 Attention: Veronica H. Montagn

December 13, 2022 8-K

Entry into a Material Definitive Agreement, Unregistered Sales of Equity Securities, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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): December 13, 2022 DELCATH SYSTEMS, INC.

December 13, 2022 EX-4.1

Form of Pre-Funded Warrant (incorporated by reference to Exhibit 4.1 to the Company’s Current Report on Form 8-K filed December 13, 2022)

Exhibit 4.1 NEITHER THIS SECURITY NOR THE SECURITIES FOR WHICH THIS SECURITY IS EXERCISABLE HAVE BEEN REGISTERED WITH THE SECURITIES AND EXCHANGE COMMISSION OR THE SECURITIES COMMISSION OF ANY STATE IN RELIANCE UPON AN EXEMPTION FROM REGISTRATION UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE ?SECURITIES ACT?), AND, ACCORDINGLY, MAY NOT BE OFFERED OR SOLD EXCEPT PURSUANT TO AN EFFECTIVE REGISTR

December 13, 2022 EX-99.2

Delcath Systems Closes Private Placement of $6.2 Million

Exhibit 99.2 Delcath Systems Closes Private Placement of $6.2 Million NEW YORK, December 13, 2022 ? Delcath Systems, Inc. (Nasdaq: DCTH), an interventional oncology company focused on the treatment of primary and metastatic cancers of the liver, today announced the closing of the previously announced private placement with certain accredited investors (the ?Private Placement?). Delcath issued and

December 13, 2022 EX-10.1

Form of Securities Purchase Agreement, dated December 7, 2022, by and among Delcath Systems, Inc. and the persons party thereto

Exhibit 10.1 SECURITIES PURCHASE AGREEMENT This Securities Purchase Agreement (this ?Agreement?) is dated as of December 7, 2022, between Delcath Systems, Inc., a Delaware corporation (the ?Company?), and each purchaser identified on the signature pages hereto (each, including its successors and assigns, a ?Purchaser? and collectively, the ?Purchasers?). WHEREAS, subject to the terms and condition

December 13, 2022 EX-99.1

Delcath Systems Announces Private Placement of $6.2 Million

Exhibit 99.1 Delcath Systems Announces Private Placement of $6.2 Million NEW YORK, December 8, 2022 ? Delcath Systems, Inc. (Nasdaq: DCTH), an interventional oncology company focused on the treatment of primary and metastatic cancers of the liver, today announced that it has entered into a securities purchase agreement with certain accredited investors for a private placement transaction (the ?Pri

December 13, 2022 EX-10.2

Form of Registration Rights Agreement dated December 7, 2022 between the Company and each other party a signatory thereto (incorporated by reference to Exhibit 10.2 to the Company’s Current Report on Form 8-K filed December 13, 2022)

Exhibit 10.2 REGISTRATION RIGHTS AGREEMENT This Registration Rights Agreement (this ?Agreement?) is made and entered into as of December 7, 2022, by and between Delcath Systems, Inc., a Delaware corporation (the ?Company?), and each of the several purchasers signatory hereto (each such purchaser, a ?Purchaser? and, collectively, the ?Purchasers?). This Agreement is made pursuant to the Securities

November 8, 2022 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 30, 2022 Or ☐ TRANSITION REPORT PURSU

Table of Contents 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 30, 2022 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: 001-1613

October 28, 2022 8-K

Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 26, 2022 DELCATH SYSTEMS, INC.

September 15, 2022 424B3

Up to 1,257,705 Shares of Common Stock Offered by the Selling Stockholders

Table of Contents Filed pursuant to 424(b)(3) Registration Statement No. 333-267321 Up to 1,257,705 Shares of Common Stock Offered by the Selling Stockholders This prospectus relates to the offer and resale, from time to time, by the selling stockholders named under the heading ?Selling Stockholders? in this prospectus, or their assigns (the ?Selling Stockholders?), of up to 1,257,705 shares of th

September 13, 2022 CORRESP

Delcath Systems, Inc. 1633 Broadway, Suite 22C New York, New York 10019

Delcath Systems, Inc. 1633 Broadway, Suite 22C New York, New York 10019 September 13, 2022 Via EDGAR Securities and Exchange Commission Division of Corporation Finance Office of Life Sciences 100 F Street, N.E. Washington, D.C. 20549 Attention: Tim Buchmiller Re: Delcath Systems, Inc. Registration Statement on Form S-3 Filed September 7, 2022 File No. 333-267321 To whom it may concern: Pursuant to

September 12, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 12, 2022 DELCATH SYSTEMS, INC.

September 12, 2022 EX-99.1

Forward-looking Statements The Private Securities Litigation Reform Act of 1995 provides a safe harbor for forward-looking statements made by the Company or on its behalf. This presentation contains forward-looking statements, which are subject to ce

Exhibit 99.1 Corporate Presentation (NASDAQ: DCTH) September 2022 Forward-looking Statements The Private Securities Litigation Reform Act of 1995 provides a safe harbor for forward-looking statements made by the Company or on its behalf. This presentation contains forward-looking statements, which are subject to certain risks and uncertainties that can cause actual results to differ materially fro

September 7, 2022 EX-FILING FEES

Filing Fee Table

EX-FILING FEES 4 d329205dexfilingfees.htm EX-FILING FEES Exhibit 107 Calculation of Filing Fee Tables S-3 (Form Type) Delcath Systems, Inc. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered (1) Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price

September 7, 2022 S-3

As filed with the Securities and Exchange Commission on September 7, 2022

Table of Contents As filed with the Securities and Exchange Commission on September 7, 2022 Registration No.

August 8, 2022 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 30, 2022 Or ☐ TRANSITION REPORT PURSUANT T

Table of Contents 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 30, 2022 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: 001-16133 DEL

July 27, 2022 SC 13D

DCTH / Delcath Systems Inc / MICHEL GERARD J - SC 13D Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. )* Delcath Systems, Inc. (Name of Issuer) Common Stock, par value $0.01 per share (Title of Class of Securities) 24661P807 (CUSIP Number) McCarter & English, LLP Four Gateway Center 100 Mulberry Street Newark, New Jersey 07102 Attention: Veronica H. Montagna

July 21, 2022 SC 13D/A

DCTH / Delcath Systems Inc / Rosalind Advisors, Inc. - DELCATH SC 13 D/A 7 Activist Investment

SC 13D/A delcath13da7.htm SC 13D/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D/A (Amendment No. 7) (Rule 13d-101) Under the Securities Exchange Act of 1934 Delcath Systems, Inc. (Name of Issuer) Common Shares (Title of Class of Securities) 24661P807 (CUSIP Number) 1633 Broadway,22nd Floor, Suite C, New York, NY 10019 (Name, Address and Telephone Number of P

July 21, 2022 EX-1

Joint Filing Agreement

Exhibit A Joint Filing Agreement The undersigned hereby agree that this Statement on Schedule 13G/A with respect to the beneficial ownership of shares of Common Stock of Delcath Systems, Inc.

July 20, 2022 EX-4.1

Form of Pre-Funded Warrant (incorporated by reference to Exhibit 4.1 to the Company’s Current Report on Form 8-K filed July 20, 2022)

Exhibit 4.1 NEITHER THIS SECURITY NOR THE SECURITIES FOR WHICH THIS SECURITY IS EXERCISABLE HAVE BEEN REGISTERED WITH THE SECURITIES AND EXCHANGE COMMISSION OR THE SECURITIES COMMISSION OF ANY STATE IN RELIANCE UPON AN EXEMPTION FROM REGISTRATION UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE ?SECURITIES ACT?), AND, ACCORDINGLY, MAY NOT BE OFFERED OR SOLD EXCEPT PURSUANT TO AN EFFECTIVE REGISTR

July 20, 2022 EX-99.2

1

EX-99.2 6 d385139dex992.htm EX-99.2 Exhibit 99.2 Delcath Systems Announces Private Placement of $5.0 Million NEW YORK, July 18, 2022 — Delcath Systems, Inc. (Nasdaq: DCTH), an interventional oncology company focused on the treatment of primary and metastatic cancers of the liver, today announced that it has entered into a securities purchase agreement with certain accredited investors for a privat

July 20, 2022 8-K

Entry into a Material Definitive Agreement, Unregistered Sales of Equity Securities, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 20, 2022 DELCATH SYSTEMS, INC.

July 20, 2022 EX-10.1

Form of Securities Purchase Agreement, dated July 18, 2022 by and among the Company and private parties thereto (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed on July 20, 2022).

Exhibit 10.1 SECURITIES PURCHASE AGREEMENT This Securities Purchase Agreement (this ?Agreement?) is dated as of July 18, 2022, between Delcath Systems, Inc., a Delaware corporation (the ?Company?), and each purchaser identified on the signature pages hereto (each, including its successors and assigns, a ?Purchaser? and collectively, the ?Purchasers?). WHEREAS, subject to the terms and conditions s

July 20, 2022 EX-99.1

Delcath Systems Closes Private Placement of $5.0 Million

Exhibit 99.1 Delcath Systems Closes Private Placement of $5.0 Million NEW YORK, July 20, 2022 ? Delcath Systems, Inc. (Nasdaq: DCTH), an interventional oncology company focused on the treatment of primary and metastatic cancers of the liver, today announced the closing of the previously announced private placement for the issuance and sale of 690,954 shares of common stock (the ?Common Stock?) and

July 20, 2022 EX-10.2

Form of Registration Rights Agreement dated July 18, 2022 between the Company and each other party a signatory thereto (incorporated by reference to Exhibit 10.2 to the Company’s Current Report on Form 8-K filed July 20, 2022)

Exhibit 10.2 REGISTRATION RIGHTS AGREEMENT This Registration Rights Agreement (this ?Agreement?) is made and entered into as of July 18, 2022, by and between Delcath Systems, Inc., a Delaware corporation (the ?Company?), and each of the several purchasers signatory hereto (each such purchaser, a ?Purchaser? and, collectively, the ?Purchasers?). This Agreement is made pursuant to the Securities Pur

June 7, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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): June 6, 2022 DELCATH SYSTEMS, INC.

June 7, 2022 EX-99.1

Forward-looking Statements The Private Securities Litigation Reform Act of 1995 provides a safe harbor for forward-looking statements made by the Company or on its behalf. This presentation contains forward-looking statements, which are subject to ce

Exhibit 99.1 Corporate Presentation (NASDAQ: DCTH) June 2022 Forward-looking Statements The Private Securities Litigation Reform Act of 1995 provides a safe harbor for forward-looking statements made by the Company or on its behalf. This presentation contains forward-looking statements, which are subject to certain risks and uncertainties that can cause actual results to differ materially from tho

June 7, 2022 EX-99.2

Positive Initial Results from CHOPIN Phase 1b Trial, FOCUS Trial Update and QoL Study Presented at the 2022 ASCO Annual Meeting

Exhibit 99.2 Positive Initial Results from CHOPIN Phase 1b Trial, FOCUS Trial Update and QoL Study Presented at the 2022 ASCO Annual Meeting Initial results from the Phase 1b portion of the CHOPIN trial of PHP in combination with ipilimumab plus nivolumab in advanced uveal melanoma in seven patients resulted in 85.7% Best Overall Response and 100% Disease Control Rate. Median progression free surv

May 25, 2022 EX-FILING FEES

Calculation of Filing Fee Table

EXHIBIT 107.1 Calculation of Filing Fee Table FORM S-8 (Form Type) DELCATH SYSTEMS, INC. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation Rule Amount Registered(1) Proposed Maximum Offering Price Per Unit(2) Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Equity Common Stock, par valu

May 25, 2022 S-8

As filed with the Securities and Exchange Commission on May 25, 2022

As filed with the Securities and Exchange Commission on May 25, 2022 Registration No.

May 25, 2022 EX-4.10

Delcath Systems, Inc. 2021 Employee Stock Purchase Plan

Exhibit 4.10 DELCATH SYSTEMS, INC. 2021 EMPLOYEE STOCK PURCHASE PLAN (As adopted by the Board of Directors on August 5, 2021 and approved by the stockholders on May 4, 2022) The purpose of the Delcath Systems, Inc. 2021 Employee Stock Purchase Plan (the ?Plan?) is to provide eligible employees of Delcath Systems, Inc. (the ?Company?) and each Designated Subsidiary (as defined in Section 11) with o

May 11, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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, 2022 DELCATH SYSTEMS, INC.

May 11, 2022 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 31, 2022 Or ☐ TRANSITION REPORT PURSUANT

Table of Contents 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 31, 2022 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: 001-16133 DE

May 11, 2022 EX-99.1

DELCATH SYSTEMS, INC. Condensed Consolidated Balance Sheets (Unaudited, in thousands, except share and per share data) March 31, 2022 December 31, 2021 Assets Current assets Cash and cash equivalents $ 16,340 $ 22,802 Restricted cash 4,151 4,151 Acco

Exhibit 99.1 Delcath Systems Reports First Quarter 2022 Results and Provides Business Update NEW YORK ? Delcath Systems, Inc. (Nasdaq: DCTH), an interventional oncology company focused on the treatment of primary and metastatic cancers of the liver, today reported business highlights and financial results for the first quarter ended March 31, 2022. Recent Business Highlights During and since the f

May 6, 2022 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 4, 2022 DELCATH SYSTEMS, INC.

April 4, 2022 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION 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)) ? Definitive Proxy Statement ? Definitive Additional Materials ? Soliciting Material Pursuant to ? 240.

March 31, 2022 EX-21

Subsidiaries of the Company

EXHIBIT 21 SUBSIDIARIES OF THE REGISTRANT 1. Delcath Holdings Limited, organized under the laws of Ireland. 2. Delcath Systems Limited, organized under the laws of Ireland. 3. Delcath UK Systems Limited, organized under the laws of England. 4. Delcath Systems GmbH, organized under the laws of Germany. 5. Delcath Systems B.V., organized under the laws of the Netherlands.

March 31, 2022 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 31, 2021 ☐ Transition report pursuant to Secti

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 31, 2021 ? 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: 001-16133 DELCATH SYSTEMS, INC. Delawa

March 31, 2022 EX-4.9

Description of Securities.

EX-4.9 2 d663303dex49.htm EX-4.9 EXHIBIT 4.9 DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 The following description of our common stock and preferred stock summarizes the material terms and provisions of our common stock and preferred stock. The following description of our capital stock does not purport to be complete and is s

March 29, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 25, 2022 DELCATH SYSTEMS, INC.

March 29, 2022 EX-99.1

DELCATH SYSTEMS, INC. Consolidated Balance Sheets (Unaudited, in thousands, except share and per share data) December 31, 2021 2020 Assets Current assets Cash and cash equivalents $ 22,802 $ 28,575 Restricted cash 4,151 181 Accounts receivable, net 4

Exhibit 99.1 Delcath Systems Reports Fourth Quarter and Full-Year 2021 Results and Provides Business Update NEW YORK ? Delcath Systems, Inc. (Nasdaq: DCTH), an interventional oncology company focused on the treatment of primary and metastatic cancers of the liver, today reported business highlights and financial results for the fourth quarter and full-year ended December 31, 2021. Recent Business

March 9, 2022 EX-99.A

Joint Filing Agreement

Exhibit A Joint Filing Agreement The undersigned hereby agree that this Statement on Schedule 13G/A with respect to the beneficial ownership of shares of Common Stock of Delcath Systems, Inc.

March 9, 2022 SC 13D/A

DCTH / Delcath Systems Inc / Rosalind Advisors, Inc. - SC 13D/A Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D/A (Amendment No. 6) (Rule 13d-101) Under the Securities Exchange Act of 1934 Delcath Systems, Inc. (Name of Issuer) Common Shares (Title of Class of Securities) 24661P807 (CUSIP Number) 1633 Broadway, 22nd Floor, Suite C, New York, NY 10019 (Name, Address and Telephone Number of Person Authorized to Receive Notice

February 14, 2022 EX-99.A

Joint Filing Agreement

Exhibit A Joint Filing Agreement The undersigned hereby agree that this Statement on Schedule 13D/A with respect to the beneficial ownership of shares of Common Stock of Delcath Systems, Inc.

February 14, 2022 SC 13D/A

DCTH / Delcath Systems Inc / Rosalind Advisors, Inc. - SC 13D/A Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D/A (Amendment No. 5) (Rule 13d-101) Under the Securities Exchange Act of 1934 Delcath Systems, Inc. (Name of Issuer) Common Shares (Title of Class of Securities) 24661P807 (CUSIP Number) 1633 Broadway,22nd Floor, Suite C, New York, NY 10019 (Name, Address and Telephone Number of Person Authorized to Receive Notices

February 8, 2022 SC 13G/A

DCTH / Delcath Systems Inc / SILVERARC CAPITAL MANAGEMENT, LLC Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1)* Delcath Systems, Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 24661P807 (CUSIP Number) December 31, 2021 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this S

January 6, 2022 8-K

Termination of a Material Definitive Agreement

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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): December 30, 2021 DELCATH SYSTEMS, INC.

January 5, 2022 S-8

As filed with the Securities and Exchange Commission on January 5, 2022

As filed with the Securities and Exchange Commission on January 5, 2022 Registration No.

January 5, 2022 EX-4.9

Delcath Systems, Inc. 2020 Omnibus Equity Incentive Plan, as amended (incorporated by reference to Exhibit 4.9 to the Company’s Registration Statement on Form S-8 filed with the Commission on January 5, 2022)

Exhibit 4.9 DELCATH SYSTEMS, INC. 2020 OMNIBUS EQUITY INCENTIVE PLAN (As adopted by Board of Directors on September 30, 2020 and approved by stockholders on November 23, 2020) (As amended by the Board of Directors on March 30, 2021 and approved by stockholders on May 6, 2021) 1. Purpose. The purpose of the Delcath Systems, Inc. 2020 Omnibus Equity Incentive Plan (the ?Plan?) is to align the intere

December 2, 2021 EX-99.2

Delcath Systems, Inc. Announces Positive Phase 3 FOCUS Trial Results for Hepzato

Exhibit 99.2 Delcath Systems, Inc. Announces Positive Phase 3 FOCUS Trial Results for Hepzato? in Liver-Dominant Metastatic Ocular Melanoma, Including Initial Survival Data Analysis On final analysis of the primary overall response (ORR) endpoint, HEPZATO further exceeded the predefined threshold for success with a median duration of response of 14 months While overall survival data continues to m

December 2, 2021 EX-99.1

The Private Securities Litigation Reform Act of 1995 provides a safe harbor for forward-looking statements made by the Company or on its behalf. This presentation contains forward-looking statements, which are subject to certain risks and uncertainti

Corporate Presentation (NASDAQ: DCTH) December 2021 Exhibit 99.1 The Private Securities Litigation Reform Act of 1995 provides a safe harbor for forward-looking statements made by the Company or on its behalf. This presentation contains forward-looking statements, which are subject to certain risks and uncertainties that can cause actual results to differ materially from those described. Factors t

December 2, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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): December 2, 2021 DELCATH SYSTEMS, INC.

November 10, 2021 EX-99.1

DELCATH SYSTEMS, INC. Condensed Consolidated Balance Sheets (in thousands, except share and per share data) September 30, 2021 December 31, 2020 Assets Current assets Cash and cash equivalents $ 24,865 $ 28,575 Restricted cash 4,151 181 Accounts rece

Exhibit 99.1 Delcath Systems Announces Third Quarter 2021 Results November 9, 2021 NEW YORK, Nov. 09, 2021 (GLOBE NEWSWIRE) ? Delcath Systems, Inc. (Nasdaq: DCTH), an interventional oncology company focused on the treatment of rare primary and metastatic cancers of the liver, today reported business highlights and financial results for the third quarter ended September 30, 2021. Recent Business Hi

November 10, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 9, 2021 DELCATH SYSTEMS, INC.

November 9, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 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 30, 2021 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: 001-16133 DELCATH SYSTEMS,

November 9, 2021 424B5

Up to $25,000,000 Common Stock

Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-257428 PROSPECTUS SUPPLEMENT (To Prospectus dated July 2, 2021) Up to $25,000,000 Common Stock We previously entered into a Controlled Equity OfferingSM Sales Agreement, or sales agreement, with Cantor Fitzgerald & Co., or Cantor Fitzgerald, relating to shares of our common stock, $0.01 par value per share, offered by this pro

October 26, 2021 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, DC 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 20, 2021 DELCATH SYSTEMS, INC.

October 18, 2021 8-K

Termination of a Material Definitive Agreement

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 12, 2021 DELCATH SYSTEMS, INC.

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