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NISOURCE INC.

For the period ended Dec 31, 2025. Filed Feb 11, 2026.

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A company's yearly report to the SEC, with audited financial statements. It is the fullest account a company gives of its business, its finances and the risks it sees.

FY2025 · Filed Feb 11, 2026

NI$45.06+2.1%Stored close · as of Nov 9, 2026

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Contents

Item 9B. Other Information

Director and Officer Trading Arrangements

The following table describes any contracts, instructions or written plans for the sale or purchase of NiSource securities and intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) of the Exchange Act that were adopted by our directors and executive officers during the quarter ended December 31, 2025:

Name and TitleDate of Adoption of Rule 10b5-1 Trading PlanScheduled Expiration Date of Rule 10b5-1 Trading Plan(1)Aggregate Number of Securities to Be Purchased or Sold
Shawn AndersonExecutive Vice President, Chief Financial Officer11/10/20255/29/2026Sale of up to 12,500 shares of common stock

(1)A trading plan may also expire on such earlier date that all transactions under the trading plan are completed.

During the quarter ended December 31, 2025, none of our directors or executive officers terminated a Rule 10b5-1 trading plan oradopted orterminated a non-Rule 10b5-1 trading arrangement (as defined in Item 408(c) of Regulation S-K).

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The text of this filing, as the company filed it with the SEC, without its images or exhibits. This is not investment advice.