MERRILLVILLE, Ind.–(BUSINESS WIRE)–NiSource Inc. (NYSE: NI) today announced, on a GAAP basis, net income available to common shareholders for the quarter ended September 30, 2026 of $129.5 million, or $0.27 of earnings per diluted share, compared to net income available to common shareholders of $94.7 million, or $0.20 of earnings per diluted share, for the same period of 2025. For the nine months ended September 30, 2026, on a GAAP basis, NiSource’s net income available to common shareholder