Form 4 Filing for ALLIANT ENERGY CORP

This filing details a Form 4 for ALLIANT ENERGY CORP, reporting transactions by Ignacio A. Cortina, a director. On April 10, 2026, Cortina acquired 666.895 Deferred Common Stock Units at a price of $73.10 per unit. These units are to be settled in common stock upon termination of services as a director. Following this transaction, Cortina owns 10,227.316 shares of Deferred Common Stock. The filing also notes adjustments for accrued dividends, reinvested through a transaction exempt from Section 16 under Rule 16a-11. The report was signed on April 14, 2026, by Omar N. Chaudhary, Attorney-in-Fact.