Ignacio A. Cortina - 10 Oct 2025 Form 4 Insider Report for ALLIANT ENERGY CORP (LNT)

Role: Director
Signature: /s/ Jake C. Blavat, Attorney-in-Fact
Issuer symbol: LNT
Transactions as of: 10 Oct 2025
Net transactions value: +$47,125
Form type: 4
Filing time: 14 Oct 2025, 14:07:41 UTC
Previous filing: 13 Aug 2025
Next filing: 24 Nov 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Cortina Ignacio A	Director	C/O ALLIANT ENERGY CORPORATION, 4902 N. BILTMORE LANE, MADISON	/s/ Jake C. Blavat, Attorney-in-Fact	14 Oct 2025	0001654634

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	LNT	Deferred Common Stock Units	Award	$47,125	+696	+8.7%	$67.75	8,675	10 Oct 2025	Deferred Common Stock	696	$0.000000	Direct	F1, F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Units are to be settled in shares of common stock upon the reporting person's termination of services as a director.
F2	Includes adjustments for accrued dividends, pursuant to a dividend reinvestment transaction exempt from Section 16 under Rule 16a-11.