X0508 4 2026-02-27 0001111711 NISOURCE INC. NI 0001311411 Yates Lloyd M 801 E. 86TH AVE MERRILLVILLE IN 46410 1 1 Director and President & CEO 0 Common Stock 2026-02-27 4 A 0 275962 47.30 A 672010.483 D Common Stock 2026-02-27 4 F 0 117285 47.30 D 554725.483 D Common Stock 2026-02-27 4 F 0 15433 47.30 D 539292.483 D Vesting of non-derivative performance stock units granted in 2023, which are exempt from liability under Section 16(b) of the Securities Exchange Act pursuant to rule 16b-3(d). Number of shares reported represent shares withheld to satisfy tax withholding obligations in connection with the vesting of the performance stock units above. Number of shares reported represent shares withheld to satisfy tax withholding obligations in connection with the vesting of the 2023 Restricted Stock Unit award. This amount includes RSUs received pursuant to the dividend equivalent provisions of his director RSU awards from 2020 and 2021, and which are subject to the same vesting conditions as the underlying RSUs. Includes shares acquired through the NiSource Inc. Employee Stock Purchase Plan. /s/ Ashley Bancroft, Attorney-in-Fact 2026-03-03