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

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-05-14 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: NISOURCE INC. (NI) CIK: 0001111711 --- Reporting Owner --- Name: BIRMINGHAM MELODY CIK: 0001738248 Role: Officer (EVP & Grp President, Utilities) --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-05-14 | Code: S (Open market sale) Shares: -10,000 | Price: $47.19 Total Value: $471,850.00 Shares Owned After: 117,899.295 | Ownership: D (Direct) Footnotes: [F1] Late due to administrative error. [Transaction #2] Security: Common Stock Date: 2026-05-20 | Code: S (Open market sale) Shares: -2,500 | Price: $47.43 Total Value: $118,575.00 Shares Owned After: 116,036.324 | Ownership: D (Direct) Footnotes: [F2] Includes shares acquired through dividend reinvestments. --- Footnotes (Complete Index) --- F1: Late due to administrative error. F2: Includes shares acquired through dividend reinvestments. --- Signature --- /s/ /s/ Ashley Bancroft, Attorney-in-Fact (2026-05-21)