NI.PRB / NiSource Inc. - Preferred Stock - SEC Filings, Annual Report, Proxy Statement

NiSource Inc. - Preferred Stock
US ˙ NYSE ˙ US65473P8813
THIS SYMBOL IS NO LONGER ACTIVE

Basic Stats
LEI 549300D8GOWWH0SJB189
CIK 1111711
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 NiSource Inc. - Preferred Stock
SEC Filings (Chronological Order)
This page provides a complete, chronological list of SEC Filings, excluding ownership filings which we provide elsewhere.
August 6, 2025 EX-99.1

NiSource announces second quarter results

Exhibit 99.1 FOR IMMEDIATE RELEASE August 6, 2025 FOR ADDITIONAL INFORMATION Media Investors [email protected] [email protected] NiSource announces second quarter results •2025 non-GAAP adjusted EPS guidance narrowed to upper half of range •Reaffirming expected annual 6%-8% 2025-2029 non-GAAP adjusted EPS growth MERRILLVILLE, Ind. - NiSource Inc. (NYSE: NI) today announced, on a GAAP basis,

August 6, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2025 ☐ TRANSITION REPORT PURSUANT TO S

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, 2025 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 001-16189 NiSource Inc. (Exact n

August 6, 2025 8-K

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant To Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 6, 2025 NiSource Inc. (Exact name of registrant as specified in its charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation or organization) Commission f

June 27, 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): June 27, 2025 NiSource Inc. (Exac

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 27, 2025 NiSource Inc. (Exact Name of Registrant as Specified in Charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation) (Commission file number) (I.R.S.

June 27, 2025 EX-4.1

Exhibit 4.1 to the NiSource Inc. Form 8-K

EX-4.1 Exhibit 4.1 UNLESS THIS GLOBAL NOTE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), NEW YORK, NEW YORK, TO NISOURCE INC. OR ITS AGENT OR AGENTS FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY GLOBAL NOTE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF

June 24, 2025 424B2

$1,650,000,000 $900,000,000 5.350% Notes due 2035 $750,000,000 5.850% Notes due 2055

424B2 Table of Contents Filed Pursuant to Rule 424(b)(2) Registration No. 333-268084 Prospectus Supplement (To Prospectus dated November 1, 2022) $1,650,000,000 $900,000,000 5.350% Notes due 2035 $750,000,000 5.850% Notes due 2055 We are offering $1,650,000,000 aggregate principal amount of notes in two series. We are offering $900,000,000 aggregate principal amount of our notes due 2035 (the “203

June 24, 2025 EX-FILING FEES

Table 1: Newly Registered and Carry Forward Securities

Calculation of Filing Fee Tables S-3 NISOURCE INC. Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing

June 23, 2025 424B5

Subject to Completion, dated June 23, 2025

Table of Contents Filed Pursuant to Rule 424(b)(5), Registration No. 333-268084 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities and are not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is not permit

June 23, 2025 FWP

NiSource Inc. $900,000,000 5.350% Notes due 2035 $750,000,000 5.850% Notes due 2055 PRICING TERM SHEET (To Preliminary Prospectus Supplement dated June 23, 2025 (the “Preliminary Prospectus Supplement”)) Issuer: NiSource Inc. Security: 5.350% Notes d

FWP Filed Pursuant to Rule 433 Registration Statement (No. 333-268084) June 23, 2025 NiSource Inc. $900,000,000 5.350% Notes due 2035 $750,000,000 5.850% Notes due 2055 PRICING TERM SHEET (To Preliminary Prospectus Supplement dated June 23, 2025 (the “Preliminary Prospectus Supplement”)) Issuer: NiSource Inc. Security: 5.350% Notes due 2035 (the “ 2035 Notes”) 5.850% Notes due 2055 (the “2055 Note

June 18, 2025 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K þ ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 OR ¨ TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 001-16189 NISOURCE INC. RETIREMENT SAVINGS PLAN

May 13, 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): May 12, 2025 NiSource Inc. (Exact

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 12, 2025 NiSource Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-16189 35-2108964 (State or other jurisdiction of incorporation) (Commission file number) (I.

May 7, 2025 EX-99.1

NiSource announces first quarter results

Exhibit 99.1 FOR IMMEDIATE RELEASE May 7, 2025 FOR ADDITIONAL INFORMATION Media Investors Kristen King Investor Relations Finance Communications [email protected] (380) 268-3023 [email protected] NiSource announces first quarter results •Reaffirming 2025 non-GAAP adjusted EPS guidance •Reaffirming expected annual 6%-8% 2025-2029 non-GAAP adjusted EPS growth MERRILLVILLE, Ind. - NiSource Inc.

May 7, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2025 ☐ TRANSITION REPORT PURSUANT TO

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, 2025 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 001-16189 NiSource Inc. (Exact

May 7, 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 7, 2025 NiSource Inc. (Exact name of registrant as specified in its charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation or organization) Commission file

March 31, 2025 DEF 14A

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

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.   )         Filed by the Registrant ☒     Filed by a Party other than the Registrant ☐         Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commis

March 31, 2025 DEFA14A

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

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

March 27, 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): March 27, 2025 NiSource Inc. (Exact Name of Registrant as Specified in Charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation) (Commission file number) (I.R.S.

March 27, 2025 EX-4.1

Exhibit 4.1 to the NiSource Inc. Form 8-K

Exhibit 4.1 UNLESS THIS GLOBAL NOTE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), NEW YORK, NEW YORK, TO NISOURCE INC. OR ITS AGENT OR AGENTS FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY GLOBAL NOTE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (A

March 21, 2025 424B2

$750,000,000 5.850% Notes due 2055

Table of Contents Filed Pursuant to Rule 424(b)(2) Registration No. 333-268084 Prospectus Supplement (To Prospectus dated November 1, 2022) $750,000,000 5.850% Notes due 2055 We are offering $750,000,000 of our notes due 2055 (the “Notes”). The Notes will bear interest at a rate of 5.850% per year. Interest on the Notes will be paid semi-annually in arrears on April 1 and October 1 of each year, b

March 21, 2025 EX-FILING FEES

Calculation of Filing Fee Table(1) (Form Type) NiSource Inc. (Exact Name of Registrant as Specified in its Charters) Table 1: Newly Registered Securities and Carry Forward Securities

Exhibit 107 Calculation of Filing Fee Table(1) 424(b)(2) (Form Type) NiSource Inc.

March 20, 2025 424B5

Subject to Completion, dated March 20, 2025

Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-268084 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities and are not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is not permitt

March 20, 2025 FWP

NiSource Inc. $750,000,000 5.850% Notes due 2055 PRICING TERM SHEET (To Preliminary Prospectus Supplement dated March 20, 2025) Issuer: NiSource Inc. Security: 5.850% Notes due 2055 (the “Notes”) Ratings (Moody’s; S&P; Fitch)*: Baa2 (stable)/BBB+ (st

Filed Pursuant to Rule 433 Registration Statement (No. 333-268084) March 20, 2025 NiSource Inc. $750,000,000 5.850% Notes due 2055 PRICING TERM SHEET (To Preliminary Prospectus Supplement dated March 20, 2025) Issuer: NiSource Inc. Security: 5.850% Notes due 2055 (the “Notes”) Ratings (Moody’s; S&P; Fitch)*: Baa2 (stable)/BBB+ (stable)/BBB (stable) Size: $750,000,000 Public Offering Price: 99.746%

February 12, 2025 EX-97.1

NiSource Inc. Compensation Recoupment Policy.

Exhibit 97.1 NISOURCE INC. COMPENSATION RECOUPMENT POLICY In the event of any required accounting restatement of the financial statements of NiSource Inc. (the “Company”) due to the material noncompliance of the Company with any financial reporting requirement under the applicable U.S. federal securities laws, including any required accounting restatement to correct an error in previously issued f

February 12, 2025 EX-21

List of Subsidiaries.

Exhibit 21 SUBSIDIARIES OF NISOURCE as of December 31, 2024 Segment/Subsidiary GAS DISTRIBUTION OPERATIONS State of Incorporation Bay State Gas Company Massachusetts Columbia Gas of Kentucky, Inc.

February 12, 2025 EX-99.1

NiSource announces full-year 2024 results

Exhibit 99.1 FOR IMMEDIATE RELEASE: February 12, 2025 NiSource announces full-year 2024 results •Achieved 2024 non-GAAP adjusted EPS above guidance range •Raising 2025 non-GAAP adjusted EPS guidance •Reaffirming expected annual 6%-8% 2025-2029 non-GAAP adjusted EPS growth MERRILLVILLE, Ind. - NiSource Inc. (NYSE: NI) today announced, on a GAAP basis, net income available to common shareholders for

February 12, 2025 EX-4.32

Description of NiSource Inc.’s Securities Registered Under Section 12 of the Exchange Act.

Exhibit 4.32 DESCRIPTION OF THE REGISTRANT'S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 NiSource Inc. ("NiSource") has one class of securities registered under Section 12 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"): common stock, par value $0.01 per share (the "common stock"). The following is a summary description of the materia

February 12, 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): February 12, 2025 NiSource Inc. (Exact name of registrant as specified in its charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation or organization) Commissio

February 12, 2025 EX-19.1

Securities Transaction Compliance Policy

Exhibit 19.1 POLICY SUBJECT: Securities Transaction Compliance Policy EFFECTIVE DATE: November 2001 REVISED: December 11, 2023 NiSource Inc. (the “Company”) has instituted the following compliance policy in order to protect the Company and assist the Company’s board of directors and all employees in complying with the prohibition against insider trading under Rule 10b-5 under the Securities Exchan

February 12, 2025 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, 2024 ☐ 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, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 001-16189 NiSource Inc. (Exact name

January 24, 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): January 22, 2025 NiSource Inc. (Exact name of registrant as specified in its charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation) Commission File Number (I.

October 30, 2024 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): October 30, 2024 NiSource Inc. (Exact name of registrant as specified in its charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation or organization) Commission

October 30, 2024 EX-99.1

NiSource announces third quarter 2024 results

Exhibit 99.1 FOR IMMEDIATE RELEASE: October 30, 2024 NiSource announces third quarter 2024 results •Reaffirming 2024 non-GAAP adjusted EPS guidance •Introducing 2025 non-GAAP adjusted EPS guidance and extending expected annual 6-8% growth to 2025-2029 •Updating 5-year capital expenditure base plan to $19.3 billion MERRILLVILLE, Ind. - NiSource Inc. (NYSE: NI) today announced, on a GAAP basis, net

October 30, 2024 EX-10.1

Amended and Restated Executive Deferred Compensation Plan, dated August 12, 2024 (filed herewith).

Exhibit 10.1 NISOURCE INC. EXECUTIVE DEFERRED COMPENSATION PLAN Amended and Restated Effective August 12, 2024 TABLE OF CONTENTS Page 1.1 Background 1 1.2 Purpose 1 ARTICLE II DEFINITIONS 2 2.1 Account 2 2.2 Affiliate 2 2.3 Annual Deferral Amount 2 2.4 Beneficiary 2 2.5 Benefits Committee 2 2.6 Board 2 2.7 CHC Committee 2 2.8 Code 2 2.9 Company 3 2.10 Compensation 3 2.11 Discretionary Contribution

October 30, 2024 10-Q

Columbia Operations

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, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 001-16189 NiSource Inc. (Ex

October 22, 2024 EX-3.3

Articles of Incorporation of NiSource Inc., as amended and restated through October 21, 2024.

Exhibit 3.3 AMENDED AND RESTATED CERTIFICATE OF INCORPORATION OF NISOURCE INC. As Amended Through October 21, 2024 AMENDED AND RESTATED CERTIFICATE OF INCORPORATION OF NISOURCE INC. It is hereby certified that: 1. The present name of the corporation (hereinafter the “Corporation”) is NiSource Inc. The Corporation was originally incorporated under the name New NiSource Inc. through its original cer

October 22, 2024 EX-3.1

Certificate of Elimination of the Company with respect to the Series C Preferred Stock, dated October 21, 2024, issued by NiSource Inc.

Exhibit 3.1 CERTIFICATE OF ELIMINATION OF SERIES C MANDATORY CONVERTIBLE PREFERRED STOCK PAR VALUE $0.01 PER SHARE OF NISOURCE INC. Pursuant to Section 151 of the General Corporation Law of the State of Delaware NiSource Inc., a corporation organized and existing under the General Corporation Law of the State of Delaware (the “Corporation”), does hereby certify as follows: 1. At a meeting of the B

October 22, 2024 EX-3.4

Bylaws of NiSource Inc., as amended and restated through October 21, 2024.

Exhibit 3.4 NISOURCE INC. AMENDED AND RESTATED BYLAWS As amended and restated through October 21, 2024 BYLAWS OF NISOURCE INC. ARTICLE I SEAL The corporate seal shall have inscribed thereon the name of the Corporation, the year of its organization and the words “Corporate Seal, Delaware.” The seal may be used by causing it or a facsimile thereof to be impressed or affixed or otherwise reproduced.

October 22, 2024 8-K

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): October 21, 2024 NiSource Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-16189 35-2108964 (State or other jurisdiction of incorporation) (Commission file number)

October 22, 2024 EX-3.2

Certificate of Elimination of the Company with respect to the Series A Junior Participating Preferred Stock, dated October 21, 2024, issued by NiSource Inc.

Exhibit 3.2 CERTIFICATE OF ELIMINATION OF SERIES A JUNIOR PARTICIPATING PREFERRED STOCK OF NISOURCE INC. Pursuant to Section 151 of the General Corporation Law of the State of Delaware NiSource Inc., a corporation organized and existing under the General Corporation Law of the State of Delaware (the “Corporation”), does hereby certify as follows: 1. Section C of ARTICLE IV of the Corporation’s Cer

September 9, 2024 EX-4.2

Second Supplemental Indenture, dated as of September 9, 2024, between NiSource Inc. and The Bank of New York Mellon, as trustee

Exhibit 4.2 NISOURCE INC. TO THE BANK OF NEW YORK MELLON Trustee Second Supplemental Indenture Dated as of September 9, 2024 6.375% Fixed-to-Fixed Reset Rate Junior Subordinated Notes due 2055 TABLE OF CONTENTS Page ARTICLE 1 DEFINITIONS 1 Section 1.1 Defined Terms 1 ARTICLE 2 DESIGNATION OF THE NOTES 3 Section 2.1 Designation and Principal Amount 3 Section 2.2 Form of the Notes 4 Section 2.3 Matu

September 9, 2024 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): September 9, 2024 NiSource Inc. (Exact Name of Registrant as Specified in Charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation) (Commission file number) (I.R

September 4, 2024 424B2

$500,000,000 6.375% Fixed-to-Fixed Reset Rate Junior Subordinated Notes due 2055

Filed Pursuant to Rule 424(b)(2) Registration No. 333-268084 Prospectus Supplement (To Prospectus dated November 1, 2022) $500,000,000 6.375% Fixed-to-Fixed Reset Rate Junior Subordinated Notes due 2055 We are offering $500,000,000 of our 6.375% Fixed-to-Fixed Reset Rate Junior Subordinated Notes due 2055 (the “Notes”). The Notes will bear interest (i) from and including September 9, 2024 (the “or

September 4, 2024 EX-FILING FEES

Calculation of Filing Fee Table(1) (Form Type) NiSource Inc. (Exact Name of Registrant as Specified in its Charters) Table 1: Newly Registered Securities and Carry Forward Securities

EX-FILING FEES Calculation of Filing Fee Table(1) 424(b)(2) (Form Type) NiSource Inc.

September 3, 2024 424B5

Subject to Completion, dated September 3, 2024

Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-268084 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities and are not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is not permitt

September 3, 2024 FWP

NiSource Inc. $500,000,000 6.375% Fixed-to-Fixed Reset Rate Junior Subordinated Notes due 2055 PRICING TERM SHEET (To Preliminary Prospectus Supplement dated September 3, 2024)

Filed Pursuant to Rule 433 Registration Statement (No. 333-268084) September 3, 2024 NiSource Inc. $500,000,000 6.375% Fixed-to-Fixed Reset Rate Junior Subordinated Notes due 2055 PRICING TERM SHEET (To Preliminary Prospectus Supplement dated September 3, 2024) This free writing prospectus relates only to the securities described below and should be read together with NiSource Inc.’s preliminary p

August 13, 2024 EX-FILING FEES

Filing Fee Table

Exhibit 107 Calculation of Filing Fee Table Form S-8 (Form Type) NiSource Inc. (Exact Name of Registrant as Specified in its Charter) Newly Registered Securities Note # 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 Common Stock, no par value Other 1,300

August 13, 2024 S-8

As filed with the Securities and Exchange Commission on August 13, 2024

S-8 As filed with the Securities and Exchange Commission on August 13, 2024 Registration No.

August 7, 2024 EX-99.1

NiSource announces second quarter 2024 results

FOR IMMEDIATE RELEASE: August 7, 2024 NiSource announces second quarter 2024 results •Reaffirming 2024 non-GAAP adjusted EPS guidance •Reaffirming 2023-2028 annual non-GAAP adjusted EPS growth of 6-8% MERRILLVILLE, Ind.

August 7, 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 7, 2024 NiSource Inc. (Exa

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant To Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 7, 2024 NiSource Inc. (Exact name of registrant as specified in its charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation or organization) Commission f

August 7, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2024 ☐ TRANSITION REPORT PURSUANT TO S

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, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 001-16189 NiSource Inc. (Exact n

June 26, 2024 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K þ ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 OR ¨ TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 001-16189 NISOURCE INC. RETIREMENT SAVINGS PLAN

June 24, 2024 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): June 24, 2024 NiSource Inc. (Exact Name of Registrant as Specified in Charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation) (Commission file number) (I.R.S.

June 24, 2024 EX-4.1

Form of 5.200% Notes due 2029

Exhibit 4.1 UNLESS THIS GLOBAL NOTE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), NEW YORK, NEW YORK, TO NISOURCE INC. OR ITS AGENT OR AGENTS FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY GLOBAL NOTE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (A

June 18, 2024 424B2

$600,000,000 5.200% Notes due 2029

Table of Contents Filed pursuant to Rule 424(b)(2) Registration No. 333-268084 Prospectus Supplement (To Prospectus dated November 1, 2022) $600,000,000 5.200% Notes due 2029 We are offering $600,000,000 of our notes due 2029 (the “Notes”). The Notes will bear interest at a rate of 5.200% per year. Interest on the Notes will be paid semi-annually in arrears on January 1 and July 1 of each year, be

June 18, 2024 EX-FILING FEES

Calculation of Filing Fee Table(1) (Form Type) NiSource Inc. (Exact Name of Registrant as Specified in its Charters) Table 1: Newly Registered Securities and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward

Exhibit 107 Calculation of Filing Fee Table(1) 424(b)(2) (Form Type) NiSource Inc.

June 17, 2024 424B5

Subject to Completion, dated June 17, 2024

Table of Contents Filed pursuant to Rule 424(b)(5) Registration No. 333-268084 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities and are not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is not permitt

June 17, 2024 424B5

Subject to Completion, dated June 17, 2024

Table of Contents Filed pursuant to Rule 424(b)(5) Registration No. 333-268084 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities and are not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is not permitt

June 17, 2024 FWP

NiSource Inc. $600,000,000 5.200% Notes due 2029 PRICING TERM SHEET (To Preliminary Prospectus Supplement dated June 17, 2024) Issuer: NiSource Inc. Security: 5.200% Notes due 2029 (the “Notes”) Ratings (Moody’s; S&P; Fitch)*: Baa2 (stable)/BBB+ (sta

Filed Pursuant to Rule 433 Registration Statement (No. 333-268084) June 17, 2024 NiSource Inc. $600,000,000 5.200% Notes due 2029 PRICING TERM SHEET (To Preliminary Prospectus Supplement dated June 17, 2024) Issuer: NiSource Inc. Security: 5.200% Notes due 2029 (the “Notes”) Ratings (Moody’s; S&P; Fitch)*: Baa2 (stable)/BBB+ (stable)/BBB (stable) Size: $600,000,000 Public Offering Price: 99.798% o

May 16, 2024 EX-4.2

Subordinated Indenture, dated as of May 16, 2024, between NiSource Inc. and The Bank of New York Mellon, as trustee

Exhibit 4.2 Execution Version NISOURCE INC. to THE BANK OF NEW YORK MELLON as Trustee INDENTURE Dated as of May 16, 2024 Providing for Issuance of Subordinated Debt Securities NiSource Inc. Reconciliation and Tie between Trust Indenture Act of 1939, as amended, and Indenture, dated as of May 16, 2024 Trust Indenture Act Section Indenture Section(s) §310 (a)(1) 609    (a)(2) 609    (a)(3)       Not

May 16, 2024 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 16, 2024 NiSource Inc. (Exact Name of Registrant as Specified in Charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation) (Commission file number) (I.R.S. E

May 16, 2024 EX-4.3

First Supplemental Indenture, dated as of May 16, 2024, between NiSource Inc. and The Bank of New York Mellon, as trustee

Exhibit 4.3 NISOURCE INC. TO THE BANK OF NEW YORK MELLON Trustee First Supplemental Indenture Dated as of May 16, 2024 6.950% Fixed-to-Fixed Reset Rate Junior Subordinated Notes due 2054 TABLE OF CONTENTS Page ARTICLE 1 DEFINITIONS 1 Section 1.1 Defined Terms 1 ARTICLE 2 DESIGNATION OF THE NOTES 3 Section 2.1 Designation and Principal Amount 3 Section 2.2 Form of the Notes 4 Section 2.3 Maturity D

May 14, 2024 EX-FILING FEES

Calculation of Filing Fee Table(1) (Form Type) NiSource Inc. (Exact Name of Registrant as Specified in its Charters) Table 1: Newly Registered Securities and Carry Forward Securities

Exhibit 107 Calculation of Filing Fee Table(1) 424(b)(2) (Form Type) NiSource Inc.

May 14, 2024 424B2

$500,000,000 6.950% Fixed-to-Fixed Reset Rate Junior Subordinated Notes due 2054

Table of Contents Filed Pursuant to Rule 424(b)(2) Registration No. 333-268084 Prospectus Supplement (To Prospectus dated November 1, 2022) $500,000,000 6.950% Fixed-to-Fixed Reset Rate Junior Subordinated Notes due 2054 We are offering $500,000,000 of our 6.950% Fixed-to-Fixed Reset Rate Junior Subordinated Notes due 2054 (the “Notes”). The Notes will bear interest (i) from and including the orig

May 13, 2024 424B5

Subject to Completion, dated May 13, 2024

Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-268084 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities and are not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is not permitt

May 13, 2024 FWP

NiSource Inc. $500,000,000 6.950% Fixed-to-Fixed Reset Rate Junior Subordinated Notes due 2054 PRICING TERM SHEET (To Preliminary Prospectus Supplement dated May 13, 2024)

Filed Pursuant to Rule 433 Registration Statement (No. 333-268084) May 13, 2024 NiSource Inc. $500,000,000 6.950% Fixed-to-Fixed Reset Rate Junior Subordinated Notes due 2054 PRICING TERM SHEET (To Preliminary Prospectus Supplement dated May 13, 2024) This free writing prospectus relates only to the securities described below and should be read together with NiSource Inc.’s preliminary prospectus

May 13, 2024 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 13, 2024 NiSource Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-16189 35-2108964 (State or other jurisdiction of incorporation) (Commission file number) (I.

May 8, 2024 EX-99.1

NiSource announces first quarter 2024 results

Exhibit 99.1 FOR IMMEDIATE RELEASE: May 8, 2024 NiSource announces first quarter 2024 results •Reaffirming 2024 non-GAAP adjusted EPS guidance •Reaffirming 2023-2028 annual non-GAAP adjusted EPS growth of 6-8% MERRILLVILLE, Ind. - NiSource Inc. (NYSE: NI) today announced, on a GAAP basis, net income available to common shareholders for the three months ended March 31, 2024, of $344.3 million, or $

May 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): May 8, 2024 NiSource Inc. (Exact

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 8, 2024 NiSource Inc. (Exact name of registrant as specified in its charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation or organization) Commission file

May 8, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2024 ☐ TRANSITION REPORT PURSUANT TO

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, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 001-16189 NiSource Inc. (Exact

April 12, 2024 PX14A6G

NiSource Inc. (NI)

NiSource Inc. (NI) Shareholder Alert Voluntary submission by John Chevedden, POB 2673, Redondo Beach, CA 90278 NiSource Shareholder since 2017 Important to Vote for Shareholder Say on Director Pay – Proposal 5 There is no greater conflict of interest than when a Board approves its own pay, with no oversight from the shareholders whose interest they must represent above their own. This proposal rec

April 1, 2024 DEF 14A

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

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

April 1, 2024 DEFA14A

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

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

March 19, 2024 EX-99.1

Aristides S. Candris Departs from the Board After 12 Years of Service

Exhibit 99.1 FOR IMMEDIATE RELEASE: March 19, 2024 Aristides S. Candris Departs from the Board After 12 Years of Service NiSource Inc. (NYSE: NI) today announced Aristides S. Candris, who has served as a director since 2012, has retired from the NiSource Board, and that it has appointed John McAvoy to its Board of Directors, effective immediately. “We are pleased with the appointment of John McAvo

March 19, 2024 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): March 18, 2024 NiSource Inc. (Exact name of registrant as specified in its charter) Delaware 001-16189 35-2108964 (State or other jurisdiction of incorporation) Commission File Number

March 18, 2024 EX-3.1

Certificate of Elimination of the Company with respect to the Series B Preferred Stock and the Series B-1 Preferred Stock, dated March 18, 2024, issued by NiSource Inc.

Exhibit 3.1 CERTIFICATE OF ELIMINATION OF 6.50% SERIES B FIXED-RATE RESET CUMULATIVE REDEEMABLE PERPETUAL PREFERRED STOCK AND SERIES B-1 PREFERRED STOCK OF NISOURCE INC. Pursuant to Section 151 of the General Corporation Law of the State of Delaware NiSource Inc., a corporation organized and existing under the General Corporation Law of the State of Delaware (the “Corporation”), does hereby certif

March 18, 2024 8-K

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year

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 18, 2024 NiSource Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-16189 35-2108964 (State or other jurisdiction of incorporation) (Commission file number) (

March 15, 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): March 15, 2024 NiSource Inc. (Exa

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant To Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 15, 2024 NiSource Inc. (Exact name of registrant as specified in its charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation) Commission File Number (I.R.

March 15, 2024 EX-99.25

EX-99.25

NOTIFICATION OF THE REMOVAL FROM LISTING AND REGISTRATION OF THE STATED SECURITIES The New York Stock Exchange hereby notifies the SEC of its intention to remove the entire class of the stated securities from listing and registration on the Exchange at the opening of business on March 26, 2024, pursuant to the provisions of Rule 12d2-2 (a).

March 15, 2024 EX-10.1

Separation Agreement dated March 15, 2024, between NiSource Inc. and Donald Brown

EX-10.1 Exhibit 10.1 SEPARATION AGREEMENT AND FULL RELEASE AND WAIVER OF CLAIMS This Confidential Separation Agreement and Full Release and Waiver of Claims (“Agreement”) is entered into by and between Donald Brown (“Employee” or “you/your”) and NiSource Corporate Services Company (“NiSource” or “the Company”) (collectively, “the Parties”). In consideration of the mutual promises, covenants, and a

March 14, 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): March 14, 2024 NiSource Inc. (Exa

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 14, 2024 NiSource Inc. (Exact Name of Registrant as Specified in Charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation) (Commission file number) (I.R.S.

March 14, 2024 EX-4.1

Form of 5.350% Notes due 2034

EX-4.1 Exhibit 4.1 UNLESS THIS GLOBAL NOTE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), NEW YORK, NEW YORK, TO NISOURCE INC. OR ITS AGENT OR AGENTS FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY GLOBAL NOTE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF

March 12, 2024 EX-FILING FEES

Calculation of Filing Fee Table(1) (Form Type) NiSource Inc. (Exact Name of Registrant as Specified in its Charters) Table 1: Newly Registered Securities and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward

Exhibit 107 Calculation of Filing Fee Table(1) 424(b)(2) (Form Type) NiSource Inc.

March 12, 2024 424B2

$650,000,000 5.350% Notes due 2034

Table of Contents Filed pursuant to Rule 424(b)(2) File No. 333-268084 Prospectus Supplement (To Prospectus dated November 1, 2022) $650,000,000 5.350% Notes due 2034 We are offering $650,000,000 of our notes due 2034 (the “Notes”). The Notes will bear interest at a rate of 5.350% per year. Interest on the Notes will be paid semi-annually in arrears on April 1 and October 1 of each year, beginning

March 11, 2024 424B5

Subject to Completion, dated March 11, 2024

Table of Contents Filed pursuant to Rule 424(b)(5) File No. 333-268084 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities and are not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is not permitted. Subj

March 11, 2024 FWP

NiSource Inc. $650,000,000 5.350% Notes due 2034 PRICING TERM SHEET (To Preliminary Prospectus Supplement dated March 11, 2024) Issuer: NiSource Inc. Security: 5.350% Notes due 2034 (the “Notes”) Ratings (Moody’s; S&P; Fitch)*: Baa2 (stable)/BBB+ (st

Filed Pursuant to Rule 433 Registration Statement (No. 333-268084) March 11, 2024 NiSource Inc. $650,000,000 5.350% Notes due 2034 PRICING TERM SHEET (To Preliminary Prospectus Supplement dated March 11, 2024) Issuer: NiSource Inc. Security: 5.350% Notes due 2034 (the “Notes”) Ratings (Moody’s; S&P; Fitch)*: Baa2 (stable)/BBB+ (stable)/BBB (stable) Size: $650,000,000 Public Offering Price: 99.781%

February 22, 2024 8-K

Entry into a Material Definitive Agreement, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 22, 2024 NiSource Inc. (Exact Name of Registrant as Specified in Charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation) (Commission file number) (I.R

February 22, 2024 EX-FILING FEES

Calculation of Filing Fee Table(1) (Form Type) NiSource Inc. (Exact Name of Registrant as Specified in its Charters) Table 1: Newly Registered Securities and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward

EX-FILING FEES Exhibit 107 Calculation of Filing Fee Table(1) 424(b)(5) (Form Type) NiSource Inc.

February 22, 2024 424B5

Up to $900,000,000 NiSource Inc. Common Stock

424B5 Table of Contents Filed pursuant to Rule 424(b)(5) File No. 333-268084 Prospectus Supplement (To Prospectus dated November 1, 2022) Up to $900,000,000 NiSource Inc. Common Stock We may issue, offer and sell up to an aggregate of $900,000,000 of our common stock, par value $0.01 per share (“common stock”) from time to time through Barclays Capital Inc. (“Barclays”), BMO Capital Markets Corp.

February 22, 2024 EX-1.1

Form of Equity Distribution Agreement

Exhibit 1.1 NISOURCE INC. COMMON STOCK, PAR VALUE $0.01 PER SHARE EQUITY DISTRIBUTION AGREEMENT February 22, 2024 February 22, 2024 To: [•] To the Addressees: NiSource Inc., a Delaware corporation (the “Company”), proposes from time to time (i) to issue and sell shares (the “Primary Shares”) of the Company’s common stock, par value $0.01 per share (the “Common Stock”), through [•] (the “Manager”),

February 22, 2024 EX-99.1

NiSource Announces Two-Year $900 Million At-The-Market (ATM) Equity Issuance Program

Exhibit 99.1 FOR IMMEDIATE RELEASE: February 22, 2024 NiSource Announces Two-Year $900 Million At-The-Market (ATM) Equity Issuance Program MERRILLVILLE, Ind. – NiSource Inc. (NYSE: NI) (“NiSource”) announced today that it has established an “at-the-market” (“ATM”) equity offering program under which it may sell shares of its common stock having an aggregate gross sales price of up to $900 million

February 22, 2024 EX-1.2

Form of Master Forward Sale Confirmation

Exhibit 1.2 To: NiSource Inc. A/C: [   ] From: [Dealer] Re: Issuer Share Forward Sale Transactions Ref. No: [   ] Date: February 22, 2024 Ladies and Gentlemen: The purpose of this communication (this “Master Confirmation”) is to set forth the terms and conditions of the transactions to be entered into from time to time between [    ] (“Dealer”)[, through its agent [    ] (the “Agent”),] and NiSour

February 21, 2024 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, 2023 ☐ 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, 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 001-16189 NiSource Inc. (Exact name

February 21, 2024 EX-10.24

First Amendment to the Savings Restoration Plan for NiSource Inc. and Affiliates dated October 12, 2023 and effective November 1, 2020.

Exhibit 10.24 FIRST AMENDMENT TO THE SAVINGS RESTORATION PLAN FOR NISOURCE INC. AND AFFILIATES (AMENDED AND RESTATED EFFECTIVE NOVEMBER 1, 2020) BACKGROUND A. NiSource Inc. (the “Company”) maintains the Savings Restoration Plan for NiSource Inc. and Affiliates, amended and restated effective November 1, 2020 (the “Plan”). B. The Company desires to amend the Plan to increase the amount of the Next-

February 21, 2024 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): February 21, 2024 NiSource Inc. (Exact name of registrant as specified in its charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation or organization) Commissio

February 21, 2024 EX-4.25

Description of NiSource Inc.’s Securities Registered Under Section 12 of the Exchange Act.

Exhibit 4.25 DESCRIPTION OF THE REGISTRANT'S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 NiSource Inc. ("NiSource") has two classes of securities registered under Section 12 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"): (i)common stock, par value $0.01 per share (the "common stock"); and (ii)depositary shares, each representing a 1

February 21, 2024 EX-99.1

NiSource announces fourth quarter 2023 results

Exhibit 99.1 FOR IMMEDIATE RELEASE: February 21, 2024 NiSource announces fourth quarter 2023 results •Achieved 2023 non-GAAP NOEPS at top end of guidance range •Raising 2024 non-GAAP NOEPS guidance to $1.70-1.74 from $1.68-1.72 •Reaffirming 6-8% annual 2023-2028 non-GAAP NOEPS growth •Successfully closed NIPSCO minority interest transaction in December MERRILLVILLE, Ind. - NiSource Inc. (NYSE: NI)

February 21, 2024 EX-10.44

Second Amended and Restated Limited Liability Company Agreement of NIPSCO Holdings II LLC, dated January 30, 2024.

Exhibit 10.44 SECOND AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT OF NIPSCO HOLDINGS II LLC TABLE OF CONTENTS Page Article I GENERAL MATTERS iv Section 1.1 Formation iv Section 1.2 Name iv Section 1.3 Purpose iv Section 1.4 Registered Office v Section 1.5 Registered Agent v Section 1.6 Members v Section 1.7 Powers vi Section 1.8 Limited Liability Company Agreement vi Section 1.9 Issuan

February 21, 2024 EX-10.48

Form of PSU Award Agreement (for award

Exhibit 10.48 NiSource Inc. 2020 Omnibus Incentive Plan 202[ ] Performance Share Unit Award Agreement This Performance Share Unit Award Agreement (the “Agreement”) is made and entered into as of [DATE] (the “Grant Date”), by and between NiSource Inc., a Delaware corporation (the “Company”), and [NAME], an Employee of the Company or an Affiliate (the “Grantee”), pursuant to the terms of the NiSourc

February 21, 2024 EX-97.1

NiSource Inc. Compensation Recoupment Policy.

Exhibit 97.1 NISOURCE INC. COMPENSATION RECOUPMENT POLICY In the event of any required accounting restatement of the financial statements of NiSource Inc. (the “Company”) due to the material noncompliance of the Company with any financial reporting requirement under the applicable U.S. federal securities laws, including any required accounting restatement to correct an error in previously issued f

February 21, 2024 EX-21

List of Subsidiaries.

Exhibit 21 SUBSIDIARIES OF NISOURCE as of December 31, 2023 Segment/Subsidiary GAS DISTRIBUTION OPERATIONS State of Incorporation Bay State Gas Company d/b/a Columbia Gas of Massachusetts Massachusetts Columbia Gas of Kentucky, Inc.

February 20, 2024 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): February 19, 2024 NiSource Inc. (Exact name of registrant as specified in its charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation) Commission File Number (I

February 13, 2024 SC 13G/A

NI / NiSource Inc. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 15)* Name of issuer: NiSource Inc Title of Class of Securities: Common Stock CUSIP Number: 65473P105 Date of Event Which Requires Filing of this Statement: December 29, 2023 Check the appropriate box to designate the rule pursuant to which this Schedule is filed: ☒ Rule

February 9, 2024 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): February 9, 2024 NiSource Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-16189 35-2108964 (State or other jurisdiction of incorporation) (Commission file number)

February 9, 2024 EX-99.1

NiSource Inc. Announces Redemption of All Depositary Shares Representing Interests in Its 6.50% Series B Fixed-Rate Reset Cumulative Redeemable Perpetual Preferred Stock and Series B-1 Preferred Stock

Exhibit 99.1 FOR IMMEDIATE RELEASE: February 9, 2024 NiSource Inc. Announces Redemption of All Depositary Shares Representing Interests in Its 6.50% Series B Fixed-Rate Reset Cumulative Redeemable Perpetual Preferred Stock and Series B-1 Preferred Stock MERRILLVILLE, Ind. - NiSource Inc. (NYSE: NI) (“NiSource”) announced today that it will redeem all outstanding shares of its 6.50% Series B Fixed-

January 26, 2024 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): January 24, 2024 NiSource Inc. (Exact name of registrant as specified in its charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation) Commission File Number (I.

January 26, 2024 EX-10.2

Exhibit 10.2 of the NiSource Inc. Form 8-K

Exhibit 10.2 CEO NiSource Inc. 2020 Omnibus Incentive Plan 202[ ] Performance Share Unit Award Agreement This Performance Share Unit Award Agreement (the “Agreement”) is made and entered into as of [DATE] (the “Grant Date”), by and between NiSource Inc., a Delaware corporation (the “Company”), and [NAME], an Employee of the Company or an Affiliate (the “Grantee”), pursuant to the terms of the NiSo

January 26, 2024 EX-10.3

Exhibit 10.3 of the NiSource Inc. Form 8-K

Exhibit 10.3 NiSource Inc. 2020 Omnibus Incentive Plan 202[ ] [Special] Restricted Stock Unit Award Agreement This [Special] Restricted Stock Unit Award Agreement (the “Agreement”), is made and entered into as of [DATE] (the “Grant Date”), by and between NiSource Inc., a Delaware corporation (the “Company”), and [NAME], an Employee of the Company or an Affiliate (the “Grantee”), pursuant to the te

January 26, 2024 EX-10.1

Exhibit 10.1 of the NiSource Inc. Form 8-K

Exhibit 10.1 CEO NiSource Inc. 2020 Omnibus Incentive Plan 202[ ] Restricted Stock Unit Award Agreement This Restricted Stock Unit Award Agreement (the “Agreement”), is made and entered into as of [DATE] (the “Grant Date”), by and between NiSource Inc., a Delaware corporation (the “Company”), and [NAME], an Employee of the Company or an Affiliate (the “Grantee”), pursuant to the terms of the NiSou

January 2, 2024 8-K

Regulation FD Disclosure, Entry into a Material Definitive Agreement

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 31, 2023 NiSource Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-16189 35-2108964 (State or other jurisdiction of incorporation) (Commission file number

January 2, 2024 EX-10.1

Exhibit 10.1 of the NiSource Inc. Form 8-K

Exhibit 10.1 Execution Version AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT OF NIPSCO HOLDINGS II LLC TABLE OF CONTENTS Page ARTICLE I GENERAL MATTERS 1 Section 1.1 Formation 1 Section 1.2 Name 1 Section 1.3 Purpose 1 Section 1.4 Registered Office 2 Section 1.5 Registered Agent 2 Section 1.6 Members 2 Section 1.7 Powers 3 Section 1.8 Limited Liability Company Agreement 3 Section 1.9 Is

January 2, 2024 EX-99.1

NiSource Inc. Completes NIPSCO Minority Equity Interest Transaction

Exhibit 99.1 FOR IMMEDIATE RELEASE: January 2, 2024 NiSource Inc. Completes NIPSCO Minority Equity Interest Transaction • Investment by Blackstone Infrastructure Partners affiliate (“Blackstone”) to acquire a 19.9% indirect non-controlling equity interest in NIPSCO for $2.16 billion, with an additional equity commitment of $250 million to fund ongoing capital requirements, strengthens NIPSCO’s fin

December 18, 2023 8-K

Entry into a Material Definitive Agreement, Material Modification to Rights of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): December 18, 2023 NiSource Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-16189 35-2108964 (State or other jurisdiction of incorporation) (Commission file number

December 18, 2023 EX-10.1

Exhibit 10.1 to the NiSource Inc. Form 8-K

Exhibit 10.1 Execution Version FOURTH SUPPLEMENTAL INDENTURE FOURTH SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”), dated as of December 18, 2023, between NiSource Inc., a Delaware corporation (“NiSource”), and The Bank of New York Mellon, a New York banking corporation, not in its individual capacity but solely as successor trustee (the “Trustee”) under the Indenture dated as of February

December 6, 2023 EX-10.1

Exhibit 10.1 to the NiSource Inc. Form 8-K

EX-10.1 Exhibit 10.1 EXECUTION COPY AUGMENTING LENDER SUPPLEMENT AUGMENTING LENDER SUPPLEMENT, dated December 6, 2023 (this “Supplement”), by and among each of the signatories hereto, to the Credit Agreement dated as of November 9, 2023 (as amended, restated, supplemented or otherwise modified from time to time, the “Credit Agreement”), between NiSource Inc., a Delaware corporation (the “Borrower”

December 6, 2023 8-K

Entry into a Material Definitive Agreement

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 6, 2023 NiSource Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-16189 35-2108964 (State or other jurisdiction of incorporation) (Commission file number)

December 1, 2023 8-K

Regulation FD Disclosure, Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant To Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): December 1, 2023 NiSource Inc. (Exact name of registrant as specified in its charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation) Commission File Number (I.

December 1, 2023 EX-99.25

EX-99.25

NOTIFICATION OF THE REMOVAL FROM LISTING AND REGISTRATION OF THE STATED SECURITIES The New York Stock Exchange hereby notifies the SEC of its intention to remove the entire class of the stated securities from listing and registration on the Exchange at the opening of business on December 12, 2023, pursuant to the provisions of Rule 12d2-2 (a).

December 1, 2023 EX-99.1

NiSource Inc. Announces the Settlement Rate for the Purchase Contract Component of its 2021 Equity Units Offering

EX-99.1 Exhibit 99.1 FOR IMMEDIATE RELEASE: December 1, 2023 NiSource Inc. Announces the Settlement Rate for the Purchase Contract Component of its 2021 Equity Units Offering MERRILLVILLE, Ind. – NiSource Inc. (NYSE: NI) (“NiSource”) announced today the settlement rate of the purchase contracts that form part of its Series A Corporate Units (the “Corporate Units”), originally issued on April 19, 2

November 17, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant To Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 17, 2023 NiSource Inc. (Exact name of registrant as specified in its charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation) Commission File Number (I

November 17, 2023 EX-99.1

###

EX-99.1 Exhibit 99.1 FOR IMMEDIATE RELEASE: November 17, 2023 NiSource Inc. Announces Results of Final Remarketing of its Series C Mandatory Convertible Preferred Stock Relating to its 2021 Equity Units Offering MERRILLVILLE, Ind. – NiSource Inc. (NYSE: NI) (“NiSource”) announced today the unsuccessful final remarketing of its Series C Mandatory Convertible Preferred Stock, par value $0.01 per sha

November 17, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant To Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 17, 2023 NiSource 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): November 17, 2023 NiSource Inc. (Exact name of registrant as specified in its charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation) Commission File Number (I

November 15, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant To Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 15, 2023 NiSource Inc. (Exact name of registrant as specified in its charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation) Commission File Number (I

November 15, 2023 EX-99.1

NiSource Inc. Announces Postponement of the Final Remarketing of its Series C Mandatory Convertible Preferred Stock

Exhibit 99.1 FOR IMMEDIATE RELEASE: November 15, 2023 NiSource Inc. Announces Postponement of the Final Remarketing of its Series C Mandatory Convertible Preferred Stock MERRILLVILLE, Ind. – NiSource Inc. (NYSE: NI) (“NiSource”) is announcing that it has postponed, at its option, the final remarketing of 862,500 shares of its Series C Mandatory Convertible Preferred Stock, par value $0.01 per shar

November 14, 2023 424B5

SUBJECT TO COMPLETION PRELIMINARY PROSPECTUS SUPPLEMENT DATED NOVEMBER 14, 2023

Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-268084 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not offers to sell nor solicitations of offers to buy these securities in any jurisdiction where the offer or sale is not permitted. SUBJECT TO COMPLETI

November 14, 2023 EX-99.1

Consistent With its Long-Term Financial Plan NiSource Inc. Announces Commencement of Final Remarketing of its Series C Mandatory Convertible Preferred Stock Relating to its 2021 Equity Units Offering

Exhibit 99.1 FOR IMMEDIATE RELEASE: November 14, 2023 Consistent With its Long-Term Financial Plan NiSource Inc. Announces Commencement of Final Remarketing of its Series C Mandatory Convertible Preferred Stock Relating to its 2021 Equity Units Offering MERRILLVILLE, Ind. – In accordance with NiSource’s long-term financial plan, NiSource Inc. (NYSE: NI) (“NiSource”) announced today the commencemen

November 14, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant To Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 14, 2023 NiSource Inc. (Exact name of registrant as specified in its charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation) Commission File Number (I

November 9, 2023 EX-10.1

Exhibit 10.1 to the NiSource Inc. Form 8-K

Exhibit 10.1 EXECUTION COPY CREDIT AGREEMENT among NISOURCE INC., as Borrower, THE LENDERS PARTY HERETO, and U.S. BANK NATIONAL ASSOCIATION, as Administrative Agent, U.S. BANK NATIONAL ASSOCIATION, as Sole Lead Arranger and Bookrunner Dated as of November 9, 2023 TABLE OF CONTENTS Page ARTICLE I DEFINITIONS 1 SECTION 1.01. DEFINED TERMS 1 SECTION 1.02. CLASSIFICATION OF LOANS AND BORROWINGS 22 SEC

November 9, 2023 8-K

Entry into a Material Definitive Agreement

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): November 9, 2023 NiSource Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-16189 35-2108964 (State or other jurisdiction of incorporation) (Commission file number)

November 1, 2023 EX-99.1

NiSource announces third quarter 2023 results, extension to long-term growth plan

Exhibit 99.1 FOR IMMEDIATE RELEASE: November 1, 2023 NiSource announces third quarter 2023 results, extension to long-term growth plan •Reaffirming 2023 non-GAAP NOEPS guidance in upper half of the range •Introducing 2024 non-GAAP NOEPS guidance and extending annual 6-8% growth from 2023-28 •NIPSCO minority interest transaction with Blackstone Infrastructure Partners on-track for closing by the en

November 1, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2023 ☐ TRANSITION REPORT PURSUANT

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, 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 001-16189 NiSource Inc. (Ex

November 1, 2023 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): November 1, 2023 NiSource Inc. (Exact name of registrant as specified in its charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation or organization) Commission

October 20, 2023 EX-99.1

NiSource Inc. announces Federal Energy Regulatory Commission approval of sale of 19.9% equity interest in NIPSCO

Exhibit 99.1 FOR IMMEDIATE RELEASE: October 19, 2023 NiSource Inc. announces Federal Energy Regulatory Commission approval of sale of 19.9% equity interest in NIPSCO MERRILLVILLE, Ind. – NiSource Inc. (NYSE: NI) (“NiSource”) announced today the Federal Energy Regulatory Commission (FERC) granted approval of the acquisition of a 19.9% equity interest in the company’s Northern Indiana Public Service

October 20, 2023 8-K

Regulation FD Disclosure

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant To Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 19, 2023 NiSource Inc. (Exact name of registrant as specified in its charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation) Commission File Number (I.

October 20, 2023 EX-99.1

Consistent With its Long-Term Financial Plan NiSource Inc. Announces Final Remarketing Period of its Series C Mandatory Convertible Preferred Stock Relating to its 2021 Equity Units Offering

Exhibit 99.1 FOR IMMEDIATE RELEASE: October 20, 2023 Consistent With its Long-Term Financial Plan NiSource Inc. Announces Final Remarketing Period of its Series C Mandatory Convertible Preferred Stock Relating to its 2021 Equity Units Offering MERRILLVILLE, Ind. – NiSource Inc. (NYSE: NI) (“NiSource”) announced today the period beginning on November 13, 2023 and ending on November 17, 2023 as the

October 20, 2023 8-K

Regulation FD Disclosure

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant To Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 20, 2023 NiSource Inc. (Exact name of registrant as specified in its charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation) Commission File Number (I.

October 5, 2023 EX-10.1

Exhibit 10.1 to the NiSource Inc. Form 8-K

Exhibit 10.1 EXECUTION COPY AMENDMENT NO. 1 TO CREDIT AGREEMENT Dated as of October 5, 2023 THIS AMENDMENT NO. 1 TO CREDIT AGREEMENT (this “Amendment”) is made as of October 5, 2023, by and among NiSource Inc., a Delaware corporation (the “Borrower”), the financial institutions listed on the signature pages hereof and JPMorgan Chase Bank, N.A., as administrative agent (the “Administrative Agent”),

October 5, 2023 8-K

Entry into a Material Definitive Agreement

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): October 5, 2023 NiSource Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-16189 35-2108964 (State or other jurisdiction of incorporation) (Commission file number)

September 28, 2023 EX-99.1

NiSource Inc. Announces Decision to Postpone the Remarketing of its Series C Mandatory Convertible Preferred Stock Due to Market

Exhibit 99.1 FOR IMMEDIATE RELEASE: September 28, 2023 NiSource Inc. Announces Decision to Postpone the Remarketing of its Series C Mandatory Convertible Preferred Stock Due to Market Conditions MERRILLVILLE, Ind. – NiSource Inc. (NYSE: NI) (“NiSource”) announced today that due to market conditions it has decided to postpone at its option the remarketing of up to 862,500 shares of its Series C Man

September 28, 2023 8-K

Regulation FD Disclosure

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant To Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 28, 2023 NiSource Inc. (Exact name of registrant as specified in its charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation) Commission File Number (

September 15, 2023 EX-99.1

Consistent With its Long-Term Financial Plan NiSource Inc. Announces its Intention to Remarket the Series C Mandatory Convertible Preferred Stock Relating to its 2021 Equity Units Offering

Exhibit 99.1 FOR IMMEDIATE RELEASE: September 15, 2023 Consistent With its Long-Term Financial Plan NiSource Inc. Announces its Intention to Remarket the Series C Mandatory Convertible Preferred Stock Relating to its 2021 Equity Units Offering MERRILLVILLE, Ind. – NiSource Inc. (NYSE: NI) (“NiSource”) announced today its intention to remarket, subject to market and other conditions, up to 862,500

September 15, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant To Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 15, 2023 NiSource Inc. (Exact name of registrant as specified in its charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation) Commission File Number (

August 23, 2023 EX-10.1

Exhibit 10.1 to the NiSource Inc. Form 8-K

Exhibit 10.1 EXECUTION COPY AMENDMENT NO. 1 Dated as of August 23, 2023 to SIXTH AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT Dated as of February 18, 2022 THIS AMENDMENT NO. 1 (this “Amendment”) is made as of August 23, 2023 by and among NiSource Inc., a Delaware corporation (the “Borrower”), the financial institutions listed on the signature pages hereof and Barclays Bank PLC, as administrati

August 23, 2023 8-K

Entry into a Material Definitive Agreement, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

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 23, 2023 NiSource Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-16189 35-2108964 (State or other jurisdiction of incorporation) (Commission file number)

August 2, 2023 EX-10.2

Exhibit 10.2 of the NiSource Inc. Form 10-Q

Exhibit 10.2 Execution Version AMENDMENT NO. 1 TO PURCHASE AND SALE AGREEMENT THIS AMENDMENT NO. 1 TO PURCHASE AND SALE AGREEMENT (this “Amendment”) is made as of the July 6, 2023 by and among NiSource Inc., a Delaware corporation (the “Parent”), NIPSCO Holdings II LLC, a Delaware limited liability company (the “Company”), and BIP Blue Buyer L.L.C., a Delaware limited liability company (the “Inves

August 2, 2023 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): August 2, 2023 NiSource Inc. (Exact name of registrant as specified in its charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation or organization) Commission f

August 2, 2023 EX-99.1

NiSource announces second quarter 2023 results

Exhibit 99.1 FOR IMMEDIATE RELEASE: August 2, 2023 NiSource announces second quarter 2023 results •2023 EPS guidance raised to upper half of range, long-term growth commitments reaffirmed •Leading regulatory execution continues in both electric and gas businesses •NIPSCO minority sale agreement with Blackstone Infrastructure Partners announced, expected to close by year-end MERRILLVILLE, Ind. - Ni

August 2, 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 June 30, 2023 ☐ TRANSITION REPORT PURSUANT TO S

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, 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 001-16189 NiSource Inc. (Exact n

June 26, 2023 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K þ ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 OR ¨ TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 001-16189 NISOURCE INC. RETIREMENT SAVINGS PLAN

June 20, 2023 EX-99.1

NiSource Announces Agreement to Sell Minority Equity Interest in NIPSCO to Strengthen Financial Foundation and Support Sustainable, Long-Term Growth Blackstone Infrastructure Partners Affiliate Agrees to Acquire 19.9% Non-Controlling Equity Interest

EX-99.1 Exhibit 99.1 NiSource Announces Agreement to Sell Minority Equity Interest in NIPSCO to Strengthen Financial Foundation and Support Sustainable, Long-Term Growth Blackstone Infrastructure Partners Affiliate Agrees to Acquire 19.9% Non-Controlling Equity Interest in NIPSCO for $2.150 Billion, with Additional Equity Commitment of $250 Million to Fund Ongoing Capital Requirements Blackstone I

June 20, 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 17, 2023 NiSource Inc. (Exac

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 17, 2023 NiSource Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-16189 35-2108964 (State or other jurisdiction of incorporation) (Commission file number) (I

June 20, 2023 EX-10.1

Exhibit 10.1 to the NiSource Inc. Form 8-K

EX-10.1 Exhibit 10.1 Execution Version PURCHASE AND SALE AGREEMENT dated as of June 17, 2023 by and among NISOURCE INC., NIPSCO HOLDINGS II LLC and BIP BLUE BUYER L.L.C. TABLE OF CONTENTS Page ARTICLE I PURCHASE AND SALE TRANSACTION; PURCHASE PRICE; THE CLOSING 1 Section 1.1 Purchase and Sale 1 Section 1.2 Purchase Price 2 Section 1.3 Closing 4 Section 1.4 The Closing Transactions 4 ARTICLE II REP

June 16, 2023 EX-3.1

Certificate of Elimination of the Company with respect to the Series A Preferred Stock, dated June 16, 2023

EX-3.1 Exhibit 3.1 CERTIFICATE OF ELIMINATION OF 5.65% SERIES A FIXED-RATE RESET CUMULATIVE REDEEMABLE PERPETUAL PREFERRED STOCK OF NISOURCE INC. Pursuant to Section 151 of the General Corporation Law of the State of Delaware NiSource Inc., a corporation organized and existing under the General Corporation Law of the State of Delaware (the “Corporation”), does hereby certify as follows: 1. At a me

June 16, 2023 8-K

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Material Modification to Rights of Security Holders, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant To Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 16, 2023 NiSource Inc. (Exact name of registrant as specified in its charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation) Commission File Number (I.R.S

June 9, 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 8, 2023 NiSource Inc. (Exact

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 8, 2023 NiSource Inc. (Exact name of registrant as specified in its charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation) Commission File Number (I.R.S.

June 9, 2023 EX-99.1

NiSource Closes on Bond Offering

EX-99.1 Exhibit 99.1 FOR IMMEDIATE RELEASE: June 8, 2023 NiSource Closes on Bond Offering MERRILLVILLE, Ind. - NiSource Inc. (NYSE: NI) (“NiSource”) closed today on its issuance of $750 million aggregate principal amount of notes in two series. NiSource issued an additional $300 million of its 5.250% notes due March 30, 2028. The 5-year senior, unsecured notes priced at 100.280% of the incremental

June 9, 2023 EX-4.2

Exhibit 4.2 to the NiSource Inc. Form 8-K

EX-4.2 Exhibit 4.2 UNLESS THIS GLOBAL NOTE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), NEW YORK, NEW YORK, TO NISOURCE INC. OR ITS AGENT OR AGENTS FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY GLOBAL NOTE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF

May 31, 2023 424B2

$750,000,000 $300,000,000 5.250% Notes due 2028 $450,000,000 5.400% Notes due 2033

424B2 Table of Contents Filed Pursuant to Rule 424(b)(2) Registration No. 333-268084 Prospectus Supplement (To Prospectus dated November 1, 2022) $750,000,000 $300,000,000 5.250% Notes due 2028 $450,000,000 5.400% Notes due 2033 We are offering $750,000,000 aggregate principal amount of notes in two series. We are offering $300,000,000 of our notes due 2028 (the “2028 Notes”) and $450,000,000 of o

May 31, 2023 EX-FILING FEES

Calculation of Filing Fee Tables Form S-3 (Form Type) NiSource Inc. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule

Exhibit 107 Calculation of Filing Fee Tables Form S-3 (Form Type) NiSource Inc. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry For

May 30, 2023 FWP

NiSource Inc. $300,000,000 5.250% Notes due 2028 $450,000,000 5.400% Notes due 2033 PRICING TERM SHEET (To Preliminary Prospectus Supplement dated May 30, 2023) Issuer: NiSource Inc. Security: 5.250% Notes due 2028 (the “2028 Notes”) 5.400% Notes due

Filed Pursuant to Rule 433 Registration Statement (No. 333-268084) May 30, 2023 NiSource Inc. $300,000,000 5.250% Notes due 2028 $450,000,000 5.400% Notes due 2033 PRICING TERM SHEET (To Preliminary Prospectus Supplement dated May 30, 2023) Issuer: NiSource Inc. Security: 5.250% Notes due 2028 (the “2028 Notes”) 5.400% Notes due 2033 (the “2033 Notes”) Ratings (Moody’s; S&P; Fitch)*: Baa2 (stable)

May 30, 2023 424B5

Subject to Completion, dated May 30, 2023

Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-268084 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities and are not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is not permitt

May 24, 2023 EX-3.1

Certificate of Amendment of Amended and Restated Certificate of Incorporation of NiSource dated May 23, 2023 (incorporated by reference to Exhibit 3.1 of the NiSource Inc. Form 8-K filed on May 24, 2023).

EX-3.1 Exhibit 3.1 STATE OF DELAWARE CERTIFICATE OF AMENDMENT OF AMENDED AND RESTATED CERTIFICATE OF INCORPORATION OF NISOURCE INC. NiSource Inc. (the “Corporation”), a corporation organized and existing under and by virtue of the General Corporation Law of the State of Delaware, does hereby certify: FIRST: that this Certificate of Amendment amends the provisions of the Corporation’s Amended and R

May 24, 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): May 23, 2023 NiSource Inc. (Exact

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, 2023 NiSource Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-16189 35-2108964 (State or other jurisdiction of incorporation) (Commission file number) (I.

May 8, 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): May 8, 2023 NiSource Inc. (Exact

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 8, 2023 NiSource Inc. (Exact name of registrant as specified in its charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation) Commission File Number (I.R.S.

May 3, 2023 EX-99.1

NiSource announces first quarter 2023 results

FOR IMMEDIATE RELEASE: May 3, 2023 NiSource announces first quarter 2023 results •2023 guidance and long-term growth commitments reaffirmed •Regulatory progress continues with a NIPSCO electric rate case settlement that provides a balanced outcome for stakeholders •NIPSCO minority interest sale launched and on track for 2023 MERRILLVILLE, Ind.

May 3, 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 ☐ TRANSITION REPORT PURSUANT TO

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 001-16189 NiSource Inc. (Exact

May 3, 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): May 3, 2023 NiSource Inc. (Exact

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 3, 2023 NiSource Inc. (Exact name of registrant as specified in its charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation or organization) Commission file

April 12, 2023 DEFA14A

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

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

April 12, 2023 DEF 14A

Definitive Proxy Statement

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

April 3, 2023 PRER14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. 1)

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. 1) 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 permitt

March 24, 2023 EX-4.1

Exhibit 4.1 to the NiSource Inc. Form 8-K

EX-4.1 Exhibit 4.1 UNLESS THIS GLOBAL NOTE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), NEW YORK, NEW YORK, TO NISOURCE INC. OR ITS AGENT OR AGENTS FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY GLOBAL NOTE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF

March 24, 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 24, 2023 NiSource Inc. (Exa

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant To Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 24, 2023 NiSource Inc. (Exact name of registrant as specified in its charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation) Commission File Number (I.R.

March 24, 2023 EX-99.1

NiSource Closes on Bond Offering

EX-99.1 Exhibit 99.1 FOR IMMEDIATE RELEASE: March 24, 2023 NiSource Closes on Bond Offering MERRILLVILLE, Ind.—NiSource Inc. (NYSE: NI) (“NiSource”) closed today on its issuance of $750 million principal amount of notes due March 30, 2028. The 5-year senior, unsecured notes priced at 99.829% of the aggregate principal amount, with a coupon rate of 5.25%. The notes will accrue interest payable semi

March 22, 2023 424B2

$750,000,000 5.250% Notes due 2028

424B2 Table of Contents Filed Pursuant to Rule 424(b)(2) Registration No. 333-268084 Prospectus Supplement (To Prospectus dated November 1, 2022) $750,000,000 5.250% Notes due 2028 The notes will mature on March 30, 2028 (the “Notes”). The Notes will bear interest at a rate of 5.250% per year. Interest on the Notes will be paid semi-annually in arrears on March 30 and September 30 of each year, be

March 22, 2023 EX-FILING FEES

Calculation of Filing Fee Tables Form S-3 (Form Type) NiSource Inc. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule

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

March 21, 2023 424B5

Subject to Completion, dated March 21, 2023

424B5 Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-268084 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities and are not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is not p

March 21, 2023 FWP

NiSource Inc. $750,000,000 5.250% Notes due 2028 PRICING TERM SHEET (To Preliminary Prospectus Supplement dated March 21, 2023) Issuer: NiSource Inc. Security: 5.250% Notes due 2028 (the “Notes”) Ratings (Moody’s; S&P; Fitch)*: Baa2 (stable)/BBB+ (st

Filed Pursuant to Rule 433 Registration Statement (No. 333-268084) March 21, 2023 NiSource Inc. $750,000,000 5.250% Notes due 2028 PRICING TERM SHEET (To Preliminary Prospectus Supplement dated March 21, 2023) Issuer: NiSource Inc. Security: 5.250% Notes due 2028 (the “Notes”) Ratings (Moody’s; S&P; Fitch)*: Baa2 (stable)/BBB+ (stable)/BBB (stable) Size: $750,000,000 Public Offering Price: 99.829%

March 20, 2023 PRE 14A

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

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

March 15, 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 14, 2023 NiSource Inc. (Exa

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 14, 2023 NiSource Inc. (Exact name of registrant as specified in its charter) Delaware 001-16189 35-2108964 (State or other jurisdiction of incorporation) Commission File Number

March 15, 2023 EX-99.1

NiSource announces leadership changes and additions

EX-99.1 Exhibit 99.1 FOR IMMEDIATE RELEASE: March 15, 2023 NiSource announces leadership changes and additions MERRILLVILLE, Ind. - NiSource (NYSE: NI) today announced the appointment of Michael Luhrs to the NiSource executive leadership team, along with a reconfiguration of leadership responsibilities for several others on that team. Michael Luhrs is joining NiSource’s executive leadership team o

March 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): March 10, 2023 NiSource Inc. (Exa

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 10, 2023 NiSource Inc. (Exact name of registrant as specified in its charter) Delaware 001-16189 35-2108964 (State or other jurisdiction of incorporation) Commission File Number

February 22, 2023 EX-10.60

Exhibit 10.60 to the NiSource Inc. Form 10-K

Exhibit 10.60 NiSource Inc. 2020 Omnibus Incentive Plan 2023 Performance Share Unit Award Agreement This Performance Share Unit Award Agreement (the “Agreement”) is made and entered into as of [DATE] (the “Grant Date”), by and between NiSource Inc., a Delaware corporation (the “Company”), and [NAME], an Employee of the Company or an Affiliate (the “Grantee”), pursuant to the terms of the NiSource

February 22, 2023 EX-10.59

Exhibit 10.59 to the NiSource Inc. Form 10-K

Exhibit 10.59 NiSource Inc. 2020 Omnibus Incentive Plan 2023 Restricted Stock Unit Award Agreement This Restricted Stock Unit Award Agreement (the “Agreement”), is made and entered into as of [DATE] (the “Grant Date”), by and between NiSource Inc., a Delaware corporation (the “Company”), and [NAME], an Employee of the Company or an Affiliate (the “Grantee”), pursuant to the terms of the NiSource I

February 22, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant To Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 22, 2023 NiSource 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): February 22, 2023 NiSource Inc. (Exact name of registrant as specified in its charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation or organization) Commissio

February 22, 2023 EX-99.1

NiSource announces 2022 results, raises 2023 guidance

FOR IMMEDIATE RELEASE: February 22, 2023 NiSource announces 2022 results, raises 2023 guidance •2022 diluted NOEPS tops guidance range; 2023 guidance range increased •NIPSCO minority interest sale launched and on track for 2023 MERRILLVILLE, Ind.

February 22, 2023 10-K

Form 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☑ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 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 001-16189 NiSource Inc. (Exact name

February 22, 2023 EX-21

List of Subsidiaries.

EX-21 6 ni-ex21x20221231.htm EX-21 Exhibit 21 SUBSIDIARIES OF NISOURCE as of December 31, 2022 Segment/Subsidiary GAS DISTRIBUTION OPERATIONS State of Incorporation Bay State Gas Company d/b/a Columbia Gas of Massachusetts Massachusetts Central Kentucky Transmission Company Delaware Columbia Gas of Kentucky, Inc. Kentucky Columbia Gas of Maryland, Inc. Delaware Columbia Gas of Ohio, Inc. Ohio Colu

February 22, 2023 EX-10.58

Exhibit 10.58 to the NiSource Inc. Form 10-K

Exhibit 10.58 NiSource Inc. 2020 Omnibus Incentive Plan 2023 Performance Share Unit Award Agreement This Performance Share Unit Award Agreement (the “Agreement”) is made and entered into as of [DATE] (the “Grant Date”), by and between NiSource Inc., a Delaware corporation (the “Company”), and [NAME], an Employee of the Company or an Affiliate (the “Grantee”), pursuant to the terms of the NiSource

February 22, 2023 EX-10.57

Exhibit 10.57 to the NiSource Inc. Form 10-K

Exhibit 10.57 NiSource Inc. 2020 Omnibus Incentive Plan 2023 Restricted Stock Unit Award Agreement This Restricted Stock Unit Award Agreement (the “Agreement”), is made and entered into as of [DATE] (the “Grant Date”), by and between NiSource Inc., a Delaware corporation (the “Company”), and [NAME], an Employee of the Company or an Affiliate (the “Grantee”), pursuant to the terms of the NiSource I

February 9, 2023 SC 13G/A

NI / NiSource Inc. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv0090-nisourceinc.htm SCHEDULE 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 14)* Name of issuer: NiSource Inc. Title of Class of Securities: Common Stock CUSIP Number: 65473P105 Date of Event Which Requires Filing of this Statement: December 30, 2022 Check the appropriate box to designate the rule

December 20, 2022 EX-10.1

Exhibit 10.1 of the NiSource Inc. Form 8-K

Exhibit 10.1 Execution Version CREDIT AGREEMENT among NISOURCE INC., as Borrower, THE LENDERS PARTY HERETO, and JPMORGAN CHASE BANK, N.A., as Administrative Agent, PNC CAPITAL MARKETS LLC, as Syndication Agent, and BANK OF AMERICA, N.A. and WELLS FARGO BANK, N.A., as Co-Documentation Agents JPMORGAN CHASE BANK, N.A., PNC CAPITAL MARKETS LLC, BANK OF AMERICA, N.A. and WELLS FARGO SECURITIES, LLC, a

December 20, 2022 8-K

Entry into a Material Definitive Agreement

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 20, 2022 NiSource Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-16189 35-2108964 (State or other jurisdiction of incorporation) (Commission file number

November 10, 2022 EX-FILING FEES

Calculation of Filing Fee Tables S-3, 424(b)(5) (Form Type) NiSource Inc. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forwar

Exhibit 107 Calculation of Filing Fee Tables S-3, 424(b)(5) (Form Type) NiSource Inc.

November 10, 2022 424B5

Up to $450,000,030 NiSource Inc. Common Stock

Table of Contents Filed pursuant to Rule 424(b)(5) File No. 333-268084 Prospectus Supplement (To Prospectus dated November 1, 2022) Up to $450,000,030 NiSource Inc. Common Stock We may issue, offer and sell up to an aggregate of $450,000,030 of our common stock from time to time through Barclays Capital Inc. (?Barclays?), J.P. Morgan Securities LLC (?J.P. Morgan?), KeyBanc Capital Markets Inc. (?K

November 10, 2022 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 10, 2022 NiSource Inc. (Exact name of registrant as specified in its charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation) (Commission File Number)

November 7, 2022 EX-99.2

NiSource announces results of its business review, top-tier long-term growth plan and 2040 net zero goal

FOR IMMEDIATE RELEASE: November 7, 2022 NiSource announces results of its business review, top-tier long-term growth plan and 2040 net zero goal ?Pursuing sale of minority stake in NIPSCO to strengthen the balance sheet and provide financing flexibility ?Annual 6-8% NOEPS long-term growth plan represents best-in-class investment proposition ?Net zero goal continues record of sustainability leadership ?Investor Day event scheduled for noon ET today MERRILLVILLE, Ind.

November 7, 2022 EX-99.1

NiSource announces third quarter 2022 results

FOR IMMEDIATE RELEASE: November 7, 2022 NiSource announces third quarter 2022 results ?2022 guidance narrowed, 2023 guidance initiated ?Regulatory agenda progress continues with electric rate case filed in Indiana, settlement reached in Ohio ?Investor Day event scheduled for noon ET today to provide details of the NiSource long-term plan extension ?Safety, reliability, customer affordability and sustainability remain top priorities MERRILLVILLE, Ind.

November 7, 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 ☐ TRANSITION REPORT PURSUANT

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 001-16189 NiSource Inc. (Ex

November 7, 2022 EX-99.1

NiSource – A Premium Utility Company November 7, 2022

Exhibit 99.1 NiSource ? A Premium Utility Company November 7, 2022 FORWARD-LOOKING STATEMENTS This presentation contains ?forward-looking statements? within the meaning of Section 27A of the Securities Act of 1933, as amended (the ?Securities Act?), and Section 21E of the Securities Exchange Act of 1934, as amended (the ?Exchange Act?). Investors and prospective investors should understand that ma

November 7, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): November 7, 2022 NiSource Inc. (Exact name of registrant as specified in its charter) Delaware 001-16189 35-2108964 (State or other jurisdiction of incorporation) Commission File Numb

November 7, 2022 8-K

Regulation FD Disclosure

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant To Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 7, 2022 NiSource Inc. (Exact name of registrant as specified in its charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation or organization) Commission

November 1, 2022 S-3ASR

As filed with the Securities and Exchange Commission on November 1, 2022

Table of Contents As filed with the Securities and Exchange Commission on November 1, 2022 Registration No.

November 1, 2022 EX-25.1

Form T-1 Statement of Eligibility under the Trust Indenture Act of 1939, as amended, of the Bank of New York Mellon as Trustee with respect to the Indenture dated as of November 14, 2000*

EX-25.1 4 d391598dex251.htm EX-25.1 Exhibit 25.1 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE ☐ CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) THE BANK OF NEW YORK MELLON (Exact name of trustee as specified in

November 1, 2022 EX-FILING FEES

Filing Fee Table*

Exhibit 107 Calculation of Filing Fee Tables Form S-3 (Form Type) NiSource Inc. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry For

November 1, 2022 EX-25.2

Form of Form T-1 Statement of Eligibility under the Trust Indenture Act of 1939, as amended, of the Bank of New York Mellon, with respect to the Form of Subordinated Indenture*

Exhibit 25.2 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE ? CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) THE BANK OF NEW YORK MELLON (Exact name of trustee as specified in its charter) New York 13-5160382 (Ju

September 20, 2022 CORRESP

September 20, 2022

September 20, 2022 By: EDGAR Transmission - Correspondence Filing Michael Purcell Ethan Horowitz Division of Corporation Finance Office of Energy & Transportation U.

August 30, 2022 CORRESP

August 30, 2022

CORRESP 1 filename1.htm August 30, 2022 By: EDGAR Transmission - Correspondence Filing Michael Purcell Ethan Horowitz Division of Corporation Finance Office of Energy & Transportation U.S. Securities and Exchange Commission 100 F Street, NE Washington, D.C. 20549 Re: NiSource Inc. Form 10-K for Fiscal Year Ended December 31, 2021 Filed February 23, 2022 File No. 001-16189 Dear Messrs. Purcell and

August 16, 2022 8-K

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): August 15, 2022 NiSource Inc. (Exact name of registrant as specified in its charter) Delaware 001-16189 35-2108964 (State or other jurisdiction of incorporation) Commission File Numbe

August 16, 2022 EX-99.1

NISOURCE ANNOUNCES DEPARTURE OF PABLO VEGAS

Exhibit 99.1 August 16, 2022 FOR ADDITIONAL INFORMATION Media Investors Christopher Garland Randy Hulen Christopher Turnure Chief Comms Officer VP, IR and Treasurer Director, Investor Relations (952) 905-6805 (219) 647-5688 (614) 404-9426 [email protected] [email protected] [email protected] NISOURCE ANNOUNCES DEPARTURE OF PABLO VEGAS MERRILLVILLE, Ind. ? NiSource Inc. (NYSE: NI) today

August 10, 2022 8-K

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): August 9, 2022 NiSource Inc. (Exact name of registrant as specified in its charter) Delaware 001-16189 35-2108964 (State or other jurisdiction of incorporation) Commission File Number

August 10, 2022 EX-3.1

Exhibit 3.1 to the NiSource Inc. Form 8-K

Exhibit 3.1 NISOURCE INC. AMENDED AND RESTATED BYLAWS As amended and restated through August 9, 2022 BYLAWS OF NISOURCE INC. ARTICLE I SEAL The corporate seal shall have inscribed thereon the name of the Corporation, the year of its organization and the words ?Corporate Seal, Delaware.? The seal may be used by causing it or a facsimile thereof to be impressed or affixed or otherwise reproduced. AR

August 3, 2022 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): August 3, 2022 NiSource Inc. (Exact name of registrant as specified in its charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation or organization) Commission f

August 3, 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 ☐ TRANSITION REPORT PURSUANT TO S

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 001-16189 NiSource Inc. (Exact n

August 3, 2022 EX-99.1

NiSource reports Second quarter 2022 results

August 3, 2022 FOR ADDITIONAL INFORMATION Media Investors Dave Rau Randy Hulen Christopher Turnure Corporate Media Relations VP, Investor Relations and Treasurer Director, Investor Relations (614) 493-8657 (219) 647-5688 (614) 404-9426 drau@nisource.

July 29, 2022 CORRESP

July 29, 2022

July 29, 2022 By: EDGAR Transmission - Correspondence Filing Michael Purcell Ethan Horowitz Division of Corporation Finance Office of Energy & Transportation U.

June 17, 2022 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K

11-K 1 a11-krsp2021.htm 11-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 11-K þ ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 OR ¨ TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 001-16189 NISOURCE

June 10, 2022 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant To Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 10, 2022 NiSource Inc. (Exact name of registrant as specified in its charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation) Commission File Number (I.R.S

June 10, 2022 EX-99.1

NISOURCE CLOSES ON INAUGURAL GREEN BOND OFFERING

Exhibit 99.1 June 10, 2022 FOR ADDITIONAL INFORMATION Media Investors Dave Rau Randy Hulen Christopher Turnure Corporate Media Relations VP, Investor Relations and Treasurer Director, Investor Relations (614) 493-8657 (219) 647-5688 (614) 404-9426 [email protected] [email protected] [email protected] NISOURCE CLOSES ON INAUGURAL GREEN BOND OFFERING MERRILLVILLE, Ind. - NiSource Inc. (NYSE:

June 10, 2022 EX-4.1

Exhibit 4.1 of the NiSource Inc. Form 8-K

Exhibit 4.1 UNLESS THIS GLOBAL NOTE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (?DTC?), NEW YORK, NEW YORK, TO NISOURCE INC. OR ITS AGENT OR AGENTS FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY GLOBAL NOTE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (A

June 8, 2022 424B2

$350,000,000 5.000% Notes due 2052

Table of Contents Filed Pursuant to Rule 424(b)(2) Registration No. 333-234422 . Prospectus Supplement (To Prospectus dated November 1, 2019) $350,000,000 5.000% Notes due 2052 The notes will mature on June 15, 2052 (the ?Notes?). The Notes will bear interest at a rate of 5.000% per year. Interest on the Notes will be paid semi-annually in arrears on June 15 and December 15 of each year, beginning

June 8, 2022 EX-FILING FEES

Calculation of Filing Fee Tables Form S-3 (Form Type) NiSource Inc. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule

EX-FILING FEES 2 d340604dexfilingfees.htm EX-FILING FEES Exhibit 107 Calculation of Filing Fee Tables Form S-3 (Form Type) NiSource Inc. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Off

June 7, 2022 424B5

Subject to Completion, dated June 7, 2022

Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-234422 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities and are not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is not permitt

June 7, 2022 FWP

NiSource Inc. $350,000,000 5.000% Notes due 2052 PRICING TERM SHEET (To Preliminary Prospectus Supplement dated June 7, 2022) Issuer: NiSource Inc. Security: 5.000% Notes due 2052 (the “Notes”) Ratings (Moody’s; S&P; Fitch)*: Baa2 (stable)/BBB+ (stab

FWP 1 d340604dfwp.htm FWP Filed Pursuant to Rule 433 Registration Statement (No. 333-234422) June 7, 2022 NiSource Inc. $350,000,000 5.000% Notes due 2052 PRICING TERM SHEET (To Preliminary Prospectus Supplement dated June 7, 2022) Issuer: NiSource Inc. Security: 5.000% Notes due 2052 (the “Notes”) Ratings (Moody’s; S&P; Fitch)*: Baa2 (stable)/BBB+ (stable)/BBB (stable) Size: $350,000,000 Public O

May 25, 2022 EX-99.1

NISOURCE ANNOUNCES LEADERSHIP CHANGES AND ADDITIONS Melody Birmingham, William (Bill) Jefferson and Melanie Berman Join Executive Leadership Team

Exhibit 99.1 May 25, 2022 FOR ADDITIONAL INFORMATION Media Investors Christopher Garland Randy Hulen Christopher Turnure Chief Comms Officer VP, IR and Treasurer Director, Investor Relations (952) 905-6805 (219) 647-5688 (614) 404-9426 [email protected] [email protected] [email protected] NISOURCE ANNOUNCES LEADERSHIP CHANGES AND ADDITIONS Melody Birmingham, William (Bill) Jefferson and

May 25, 2022 8-K

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 24, 2022 NiSource Inc. (Exact name of registrant as specified in its charter) Delaware 001-16189 35-2108964 (State or other jurisdiction of incorporation) Commission File Number (

May 4, 2022 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 4, 2022 NiSource Inc. (Exact name of registrant as specified in its charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation or organization) Commission file

May 4, 2022 EX-99.1

NiSource reports First quarter 2022 results

May 4, 2022 FOR ADDITIONAL INFORMATION Media Investors Dave Rau Randy Hulen Christopher Turnure Corporate Media Relations VP, Investor Relations and Treasurer Director, Investor Relations (614) 493-8657 (219) 647-5688 (614) 404-9426 drau@nisource.

May 4, 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 ☐ TRANSITION REPORT PURSUANT TO

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 001-16189 NiSource Inc. (Exact

May 4, 2022 EX-10.1

Exhibit 10.1 of the NiSource Inc. Form 10-Q

Exhibit 10.1 FIRST AMENDMENT TO THE NISOURCE INC. 2020 Omnibus Incentive Plan BACKGROUND A.NiSource Inc. (the ?Company?) maintains the NiSource Inc. 2020 Omnibus Incentive Plan (the ?Plan?). B.The Company desires to amend the Plan to provide the Compensation and Human Capital Committee (the ?Committee?) of the Board of Directors (the ?Board?) the authority to delegate some or all of its power and

April 27, 2022 8-K

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): April 25, 2022 NiSource Inc. (Exact name of registrant as specified in its charter) Delaware 001-16189 35-2108964 (State or other jurisdiction of incorporation) Commission File Number

April 27, 2022 EX-99.1

NISOURCE ANNOUNCES RETIREMENT OF VIOLET SISTOVARIS

Exhibit 99.1 April 27, 2022 FOR ADDITIONAL INFORMATION Media Investors Christopher Garland Randy Hulen Christopher Turnure Chief Comms Officer VP, IR and Treasurer Director, Investor Relations (952) 905-6805 (219) 647-5688 (614) 404-9426 [email protected] [email protected] [email protected] NISOURCE ANNOUNCES RETIREMENT OF VIOLET SISTOVARIS MERRILLVILLE, Ind. ? NiSource Inc. (NYSE: NI)

April 19, 2022 DEF 14A

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

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

March 16, 2022 8-K/A

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A Amendment No. 1 CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 15, 2022 NiSource Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-16189 35-2108964 (State or other jurisdiction of incorporation) (Commiss

March 16, 2022 EX-99.1

NiSource Appoints Bill Johnson to its Board of Directors Wayne DeVeydt Departs from the Board After Six Years of Service

Exhibit 99.1 March 15, 2022 FOR ADDITIONAL INFORMATION Media Investors Christopher Garland Randy Hulen Christopher Turnure SVP Communications VP, Investor Relations and Treasurer Director, Investor Relations (952) 905-6805 (219) 647-5688 (614) 404-9426 [email protected] [email protected] [email protected] NiSource Appoints Bill Johnson to its Board of Directors Wayne DeVeydt Departs fro

March 16, 2022 8-K

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 14, 2022 NiSource Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-16189 35-2108964 (State or other jurisdiction of incorporation) (Commission file number) (

February 23, 2022 EX-99.1

NiSource reports Fourth quarter 2021 results

February 23, 2022 FOR ADDITIONAL INFORMATION Media Investors Dave Rau Randy Hulen Christopher Turnure Corporate Media Relations VP, Investor Relations and Treasurer Director, Investor Relations (614) 493-8657 (219) 647-5688 (614) 404-9426 drau@nisource.

February 23, 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 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 001-16189 NiSource Inc. (Exact name

February 23, 2022 EX-21

List of Subsidiaries.

Exhibit 21 SUBSIDIARIES OF NISOURCE as of December 31, 2021 Segment/Subsidiary GAS DISTRIBUTION OPERATIONS State of Incorporation Bay State Gas Company d/b/a Columbia Gas of Massachusetts Massachusetts Central Kentucky Transmission Company Delaware Columbia Gas of Kentucky, Inc.

February 23, 2022 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): February 23, 2022 NiSource Inc. (Exact name of registrant as specified in its charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation or organization) Commissio

February 18, 2022 EX-10.1

Exhibit 10.1 of the NiSource Inc. Form 8-K

Exhibit 10.1 EXECUTION COPY SIXTH AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT among NISOURCE INC., as Borrower, THE LENDERS PARTY HERETO, BARCLAYS BANK PLC, as Administrative Agent, JPMORGAN CHASE BANK, N.A. and MUFG BANK, LTD., as Co-Syndication Agents, CREDIT SUISSE AG, NEW YORK BRANCH, WELLS FARGO BANK, NATIONAL ASSOCIATION and BANK OF AMERICA, NATIONAL ASSOCIATION, as Co-Documentation Agen

February 18, 2022 8-K

Entry into a Material Definitive Agreement, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): February 18, 2022 NiSource Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-16189 35-2108964 (State or other jurisdiction of incorporation) (Commission file number

February 9, 2022 SC 13G/A

NI / NiSource Inc. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 13)* Name of issuer: NiSource Inc. Title of Class of Securities: Common Stock CUSIP Number: 65473P105 Date of Event Which Requires Filing of this Statement: December 31, 2021 Check the appropriate box to designate the rule pursuant to which this Schedule is filed: ??Rule

January 27, 2022 8-K

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): January 27, 2022 NiSource Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-16189 35-2108964 (State or other jurisdiction of incorporation) (Commission file number)

January 27, 2022 EX-99.2

NiSource Appoints Sondra Barbour and Cassandra Lee to its Board of Directors

Exhibit 99.2 January 27, 2022 FOR ADDITIONAL INFORMATION Media Investors Christopher Garland Randy Hulen Christopher Turnure Chief Communications Officer (952) 905-6805 VP, Investor Relations and Treasurer (219) 647-5688 Director, Investor Relations (614) 404-9426 [email protected] [email protected] [email protected] NiSource Appoints Sondra Barbour and Cassandra Lee to its Board of Dir

January 27, 2022 EX-99.1

NiSource CEO Joe Hamrock to Retire Following Accomplished Ten-Year Career with the Company Seasoned regulated utility executive, Lloyd Yates, appointed as next CEO

Exhibit 99.1 January 27, 2022 FOR ADDITIONAL INFORMATION Media Investors Christopher Garland Randy Hulen Christopher Turnure Chief Communications Officer VP, Investor Relations and Treasurer Director, Investor Relations (952) 905-6805 (219) 647-5688 (614) 404-9426 [email protected] [email protected] [email protected] NiSource CEO Joe Hamrock to Retire Following Accomplished Ten-Year Car

November 9, 2021 S-8

As filed with the Securities and Exchange Commission on November 9, 2021

As filed with the Securities and Exchange Commission on November 9, 2021 Registration No.

November 3, 2021 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): November 3, 2021 NiSource Inc. (Exact name of registrant as specified in its charter) DE 001-16189 35-2108964 (State or other jurisdiction of incorporation or organization) Commission

November 3, 2021 EX-99.1

NiSource Reports Third Quarter 2021 Results

November 3, 2021 FOR ADDITIONAL INFORMATION Media Investors Dave Rau Randy Hulen Christopher Turnure Corporate Media Relations VP, Investor Relations and Treasurer Director, Investor Relations (614) 493-8657 (219) 647-5688 (614) 404-9426 drau@nisource.

November 3, 2021 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 ☐ TRANSITION REPORT PURSUANT

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 001-16189 NiSource Inc. (Ex

October 25, 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, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): October 20, 2021 NiSource Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-16189 35-2108964 (State or other jurisdiction of incorporation) (Commission file number)

September 10, 2021 8-K

Regulation FD Disclosure

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): September 7, 2021 NiSource Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-16189 35-2108964 (State or other jurisdiction of incorporation) (Commission file number

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