Dylan Syse - 19 Feb 2026 Form 4 Insider Report for ALLIANT ENERGY CORP (LNT)

Role: CAO and Controller
Signature: /s/ Jake C. Blavat, Attorney-in-Fact
Issuer symbol: LNT
Transactions as of: 19 Feb 2026
Net transactions value: -$35,425
Form type: 4
Filing time: 23 Feb 2026, 19:07:53 UTC
Previous filing: 12 Mar 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Syse Dylan	CAO and Controller	C/O ALLIANT ENERGY CORPORATION, 4902 N. BILTMORE LANE, MADISON	/s/ Jake C. Blavat, Attorney-in-Fact	23 Feb 2026	0002058131

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	LNT	Common Stock	Award	$0	+1,063	+39%	$0.000000	3,776	19 Feb 2026	Direct
transaction	LNT	Common Stock	Award	$0	+750	+20%	$0.000000	4,526	19 Feb 2026	Direct	F1
transaction	LNT	Common Stock	Tax liability	$35,425	-506	-11%	$70.01	4,020	19 Feb 2026	Direct

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

Explanation of Responses:

Id	Content
F1	Represents restricted stock units (RSUs) which are converted to common stock on a one-to-one basis when vested. The RSUs vest on December 31, 2028.