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 - Seite 2

Goldman Sachs & Co. LLC, J.P. Morgan and Wells Fargo Securities are acting as the remarketing agents and BofA Securities, PNC Capital Markets LLC and Scotiabank are acting as co-remarketing agents for this final remarketing.

The final remarketing is being made pursuant to an effective registration statement filed with the U.S. Securities and Exchange Commission. Any offers to remarket the Mandatory Convertible Preferred Stock will be made exclusively by means of a prospectus supplement and accompanying prospectus. Copies of the prospectus supplement and accompanying prospectus relating to the remarketing may be obtained from (i) Goldman Sachs & Co. LLC, Attn: Prospectus Department, 200 West Street, New York, NY 10282, by phone at [phone] or by email at [e-mail], (ii) J.P. Morgan Securities LLC, c/o Broadridge Financial Solutions, 1155 Long Island Avenue, Edgewood, NY 11717 or by telephone at [phone] or by email at [e-mail] or (iii) Wells Fargo Securities, LLC, at 500 West 33rd Street, New York, New York, 10001, Attn: Equity Syndicate Department, by calling toll free 1-800-326-5897, or by e-mail at [e-mail].

About NiSource

References in this press release to “NiSource” refer to NiSource Inc. and “we,” “us” or “our” refer collectively to NiSource and its subsidiaries.

NiSource Inc. (NYSE: NI) is one of the largest fully-regulated utility companies in the United States, serving approximately 3.2 million natural gas customers and 500,000 electric customers across six states through its local Columbia Gas and NIPSCO brands. Based in Merrillville, Indiana, NiSource's approximately 7,500 employees are focused on safely delivering reliable and affordable energy to our customers and communities we serve. NiSource is a member of the Dow Jones Sustainability Index - North America. NI-F

Forward-Looking Statements

This press release 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”). Forward-looking statements in this press release include, but are not limited to, statements concerning our ability to complete the final remarketing on the anticipated timeline or at all, the anticipated benefits of the final remarketing if completed, our plans, strategies and objectives, and any and all underlying assumptions and other statements that are other than statements of historical fact. Investors and prospective investors should understand that many factors govern whether any forward-looking statement contained herein will be or can be realized. Any one of those factors could cause actual results to differ materially from those projected. Expressions of future goals and expectations and similar expressions, including “may,” “will,” “should,” “could,” “would,” “aims,” “seeks,” “expects,” “plans,” “anticipates,” “intends,” “believes,” “estimates,” “predicts,” “potential,” “targets,” “forecast,” and “continue,” reflecting something other than historical fact are intended to identify forward-looking statements. All forward-looking statements are based on assumptions that management believes to be reasonable; however, there can be no assurance that actual results will not differ materially.