JOHN O. LARSEN - 31 Dec 2021 Form 4 Insider Report for ALLIANT ENERGY CORP (LNT)

Role: President, Chair and CEO, Director
Signature: /s/ Jake C. Blavat, Attorney-in-Fact
Issuer symbol: LNT
Transactions as of: 31 Dec 2021
Transactions value $: $0
Form type: 4
Filing time: 04 Jan 2022, 09:00:53 UTC
Next filing: 22 Feb 2022
SEC: View on sec.gov

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	LNT	Common Stock	Options Exercise	$0	+16.4K	+16.33%	$0.00	117K	31 Dec 2021	Direct	F1, F2, F3
holding	LNT	Common Stock						10.4K	31 Dec 2021	By 401(k) Plan	F4

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	Restricted Stock Units	Options Exercise	$0	-16.4K	-100%	$0.00^*	0	31 Dec 2021	Common Stock	16.4K		Direct	F1, F2, F5

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

Explanation of Responses:

Id	Content
F1	Includes dividend equivalent shares accrued during the vesting period.
F2	Each restricted stock unit (RSU) converts into one share of LNT common stock.
F3	Includes adjustments for accrued dividends, pursuant to a dividend reinvestment transaction exempt from Section 16 under Rule 16a-11.
F4	Reflects 401(k) holdings as of this filing date.
F5	The RSUs vested on December 31, 2021.