X0508 4 2026-01-21 0001111711 NISOURCE INC. NI 0001921786 Luhrs Michael 801 E. 86TH AVENUE MERRILLVILLE IN 46410 1 EVP, Tech, Customer & CCO 0 Common Stock 2026-01-21 4 A 0 6851 43.79 A 94957.128 D Common Stock 2026-01-22 4 F 0 5393 43.52 D 89564.128 D Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of the Company's common stock pursuant to the NiSource Inc. 2020 Omnibus Incentive Plan. Subject to certain forfeiture conditions, the RSUs will 100% vest on February 28, 2029, provided that the reporting person is continuously employed by the Company through and including that date. Number of shares reported represent shares withheld to satisfy tax withholding obligations in connection with the partial vesting of the 2025 Special Restricted Stock Unit award. Includes shares acquired through the NiSource Inc. Employee Stock Purchase Plan. /s/ Ashley Bancroft, Attorney-in-Fact 2026-01-23