X0609 4 2026-08-14 0001111711 NISOURCE INC. NI 0001738248 BIRMINGHAM MELODY false 801 E. 86TH AVENUE MERRILLVILLE IN 46410 1 EVP & Grp President, Utilities 0 Common Stock 2026-08-14 4 S 0 37509.173 42.40 D 78527.151 D The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $42.39 to $42.42, inclusive. The reporting person undertakes to provide to NiSource Inc., any security holder of NiSource Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. /s/ Ashley Bancroft, Attorney-in-Fact 2026-08-18