ALLIANT ENERGY CORP (LNT) · Insider Trading (Form 4) SEC Filing

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-04-15 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: ALLIANT ENERGY CORP (LNT) CIK: 0000352541 --- Reporting Owner --- Name: Smyth Antonio P CIK: 0001973120 Role: Officer (Executive Vice President) --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-04-15 | Code: F (Payment of exercise/tax) Shares: -1,259 | Price: $72.18 Total Value: $90,874.62 Shares Owned After: 20,678 | Ownership: D (Direct) Footnotes: [F1] Represents shares withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting and settlement of restricted stock units and does not represent a sale by the Reporting Person. [F2] Includes shares acquired pursuant to transactions exempt from Section 16 under Rule 16a-11. --- Footnotes (Complete Index) --- F1: Represents shares withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting and settlement of restricted stock units and does not represent a sale by the Reporting Person. F2: Includes shares acquired pursuant to transactions exempt from Section 16 under Rule 16a-11. --- Signature --- /s/ /s/ Jake C. Blavat, Attorney-in-Fact (2026-04-16)