Stockholder Information FORWARD-LOOKING STATEMENTS This report contains “forward-looking statements,” within the meaning of the federal securities laws. 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. Examples of forward-looking statements include, but are not limited to, statements concerning NiSource’s plans, strategies, objectives, expected performance, expenditures, recovery of expenditures through rates, and any and all underlying assumptions and other statements that are other than statements of historical fact. 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. Factors that could cause actual results to differ materially from the projections, forecasts, estimates and expectations discussed in this report include, among other things, NiSource’s debt obligations; any changes to the credit rating of NiSource or certain of its subsidiaries; NiSource’s ability to execute its growth strategy; changes in general economic, capital and commodity market conditions; pension funding obligations; economic regulation and the impact of regulatory rate reviews; NiSource’s ability to obtain expected financial or regulatory outcomes; any damage to NiSource’s reputation; compliance with environmental laws and the costs of associated liabilities; fluctuations in demand from residential and commercial customers; economic conditions of certain industries; the success of NIPSCO’s electric generation strategy; the price of energy commodities and related transportation costs; the reliability of customers and suppliers to fulfill their payment and contractual obligations; potential impairments of goodwill or definite-lived intangible assets; changes in taxation and accounting principles; potential incidents and other operating risks associated with NiSource’s business; the impact of an aging infrastructure; the impact of climate change; potential cyber-attacks; construction risks and natural gas costs and supply risks; extreme weather conditions; the attraction and retention of a qualified workforce; advances in technology; the ability of NiSource’s subsidiaries to generate cash; uncertainties related to the expected benefits of the Separation; the ability of NiSource to manage new initiatives and organizational changes; the performance of certain third-party suppliers upon which NiSource relies; NiSource’s ability to obtain sufficient insurance coverage; and other matters set forth in Item 1A, “Risk Factors” of the accompanying Annual Report on Form 10-K for the year ended December 31, 2017, many of which risks are beyond the control of NiSource. In addition, the relative contributions to profitability by each business segment, and the assumptions underlying the forward-looking statements relating thereto, may change over time. All forward-looking statements are expressly qualified in their entirety by the foregoing cautionary statements. NiSource undertakes no obligation to, and expressly disclaims any such obligation to, update or revise any forward-looking statements to reflect changed assumptions, the occurrence of anticipated or unanticipated events or changes to the future results over time or otherwise, except as required by law. REGULATION G DISCLOSURE STATEMENT This report includes financial results and guidance for NiSource with respect to net operating earnings, which is a non-GAAP financial measure as defined by the SEC’s Regulation G. The company includes this measure because management believes it permits investors to view the company’s performance using the same tools that management uses and to better evaluate the company’s ongoing business performance. With respect to such guidance, it should be noted that there will likely be a difference between this measure and its GAAP equivalent due to various factors, including, but not limited to, fluctuations in weather, the impact of asset sales and impairments, and other items included in GAAP results. The company is not able to estimate the impact of such factors on GAAP earnings and, as such, is not providing earnings guidance on a GAAP basis. ANTICIPATED DIVIDEND RECORD & PAYMENT DATES - NI COMMON STOCK COMMON STOCK DIVIDEND DECLARED On February 20, 2018, the company paid a quarterly dividend of $0.195 per share, equivalent to $0.78 per share on an annual basis. INVESTOR & FINANCIAL INFORMATION Financial analysts and investment professionals should direct written and telephone inquiries to NiSource Investor Relations at 801 E. 86th Avenue, Merrillville, IN 46410 or (614) 460-4789. Copies of NiSource’s financial reports are available by writing or calling the Investor Relations department at the address or phone number listed above. The materials are also available at NiSource.com. STOCKHOLDER SERVICES Questions about stockholder accounts, stock certificates, transfer of shares, dividend payments, automatic dividend reinvestment and stock purchase plan, and electronic deposit may be directed to Computershare at the following: Computershare c/o Shareholder Services P. O. Box 505000 Louisville, KY 40233-5000 or c/o Shareholder Services 462 South 4th Street, Suite 1600 Louisville, KY 40202 (888) 884-7790 TDD for Hearing Impaired: (800) 231-5469 Foreign Stockholders: (201) 680-6578 TDD Foreign Stockholders: (201) 680-6610 computershare.com/investor RECORD DATE 04/30/18 07/31/18 10/31/18 02/11/19 PAYMENT DATE 05/18/18 08/20/18 11/20/18 02/20/19