NISOURCE INC. (NI) · Insider Trading (Form 4) SEC Filing

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-05-11 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: NISOURCE INC. (NI) CIK: 0001111711 --- Reporting Owner --- Name: McAvoy John CIK: 0001564677 Role: Director --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-05-11 | Code: A (Grant or award) Shares: +3,807 | Price: $47.03 Total Value: $179,043.21 Shares Owned After: 15,777.114 | Ownership: D (Direct) Footnotes: [F1] Represents an award of restricted stock units ("RSU") granted as part of the non-employee director's annual compensation and which vests in full on the first anniversary of the grant date, subject to certain acceleration conditions. RSUs represent a contingent right to receive one share of the Company's common stock upon vesting pursuant to the Company's 2020 Omnibus Plan. [F2] This amount includes RSUs received pursuant to the dividend equivalent provisions of the RSU awards, and which are subject to the same vesting conditions as the underlying RSUs. --- Footnotes (Complete Index) --- F1: Represents an award of restricted stock units ("RSU") granted as part of the non-employee director's annual compensation and which vests in full on the first anniversary of the grant date, subject to certain acceleration conditions. RSUs represent a contingent right to receive one share of the Company's common stock upon vesting pursuant to the Company's 2020 Omnibus Plan. F2: This amount includes RSUs received pursuant to the dividend equivalent provisions of the RSU awards, and which are subject to the same vesting conditions as the underlying RSUs. --- Signature --- /s/ /s/ Ashley Bancroft, Attorney-in-Fact (2026-05-13)