Alliant EVP has shares withheld for RSU taxes

ALLIANT ENERGY CORP Executive Vice President Antonio P. Smyth reported a routine tax-related share disposition.

Rhea-AI Filing Summary

ALLIANT ENERGY CORP Executive Vice President Antonio P. Smyth reported a routine tax-related share disposition. The company withheld 1,259 shares of common stock at $72.18 per share to cover tax obligations tied to the vesting and settlement of restricted stock units.

The footnotes clarify this is not an open-market sale by Smyth but a mechanistic tax-withholding event. After the transaction, he directly holds 20,678 shares of Alliant Energy common stock, reflecting his ongoing equity stake in the company.

Insider Trade Summary

Exercise Price or Tax Liability: 1,259 shares

Exercise Price or Tax Liability 1 txn

Insider Smyth Antonio P

Role Executive Vice President

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	1,259	$72.18	$91K

Holdings After Transaction: Common Stock — 20,678 shares (Direct)

Footnotes (2)

1. 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.
2. F2. Includes shares acquired pursuant to transactions exempt from Section 16 under Rule 16a-11.

Key Figures

Shares withheld for taxes: 1,259 shares Withholding reference price: $72.18 per share Shares held after transaction: 20,678 shares +1 more

4 metrics

Shares withheld for taxes 1,259 shares Tax withholding on RSU vesting for Antonio P. Smyth

Withholding reference price $72.18 per share Value used for tax-withholding shares

Shares held after transaction 20,678 shares Smyth’s direct Alliant Energy common stock holdings post-transaction

Tax-withholding transactions 1 transaction, 1,259 shares Summary of tax withholding events in this Form 4

Key Terms

restricted stock units, tax withholding obligations, Section 16, Rule 16a-11

4 terms

restricted stock units financial

"in connection with the vesting and settlement of restricted stock units"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

tax withholding obligations financial

"shares withheld by the Issuer to satisfy tax withholding obligations"

Section 16 regulatory

"Includes shares acquired pursuant to transactions exempt from Section 16 under Rule 16a-11."

Section 16 is a U.S. securities law rule that governs the trading and disclosure obligations of company insiders — typically officers, directors and large shareholders — to promote transparency and deter unfair profit-taking. It requires insiders to publicly report their stock trades and allows companies or the issuer to reclaim quick, short-term profits from certain insider trades, like a scoreboard and a refund policy that help investors see and limit possible insider advantage.

Rule 16a-11 regulatory

"transactions exempt from Section 16 under Rule 16a-11."

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did Alliant Energy (LNT) executive Antonio P. Smyth report in this Form 4?

Executive Vice President Antonio P. Smyth reported a tax-related share disposition. Alliant Energy withheld 1,259 common shares to cover taxes on vested restricted stock units, leaving him with 20,678 directly held shares after the transaction.

Was Antonio P. Smyth’s Alliant Energy (LNT) Form 4 a stock sale?

No, the Form 4 does not show an open-market sale. The 1,259 shares were withheld by Alliant Energy to satisfy tax obligations on restricted stock unit vesting, as the footnote states, and are not a discretionary sale by Smyth.

How many Alliant Energy (LNT) shares were withheld for Antonio P. Smyth’s taxes?

Alliant Energy withheld 1,259 common shares from Antonio P. Smyth. The filing states these shares covered tax withholding obligations related to vesting and settlement of restricted stock units rather than being sold in the market.

What is Antonio P. Smyth’s Alliant Energy (LNT) shareholding after this Form 4?

After the tax-withholding transaction, Antonio P. Smyth directly holds 20,678 Alliant Energy common shares. This post-transaction balance is reported in the Form 4 as his total direct ownership following the tax-related share withholding.

What does the Form 4 footnote say about Alliant Energy (LNT) shares withheld?

The footnote explains the 1,259 shares represent amounts withheld by Alliant Energy to satisfy tax obligations from restricted stock unit vesting. It explicitly notes this withholding does not represent a sale by the reporting person Antonio P. Smyth.

What are restricted stock units mentioned in Alliant Energy (LNT) filing?

Restricted stock units are share-based compensation that vest over time. In this Form 4, Smyth’s RSUs vested and settled into shares, and Alliant Energy withheld 1,259 of those shares to pay required taxes on the compensation event.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 04/16/2026 - 07:11 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Smyth Antonio P

(Last) (First) (Middle)

C/O ALLIANT ENERGY CORPORATION

4902 N. BILTMORE LANE

(Street)

MADISON WISCONSIN 53718

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
ALLIANT ENERGY CORP [ LNT ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Executive Vice President

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/15/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	04/15/2026		F(1)		1,259	D	$72.18	20,678(2)	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. 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.

2. Includes shares acquired pursuant to transactions exempt from Section 16 under Rule 16a-11.

Remarks:

	/s/ Jake C. Blavat, Attorney-in-Fact	04/16/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)