Kaiser Aluminum (KALU) CEO reports equity awards and tax share withholdings

Rhea-AI Filing Summary

Kaiser Aluminum Corp President & CEO Keith Harvey reported equity compensation changes in company stock. On March 5, 2026, he acquired 17,795 restricted stock units and 47,895 shares earned from performance share vesting, both at no cash price, under the 2021 Equity and Incentive Compensation Plan.

On the same date, 17,722 shares and 6,859 shares were withheld at a price of $125.84 per share to cover tax obligations from these vestings. After these grant and tax-withholding transactions, Harvey directly owned 144,340 shares of Kaiser Aluminum common stock.

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

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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^*

Harvey Keith

(Last) (First) (Middle)

1550 WEST MCEWEN DRIVE

SUITE 500

(Street)

FRANKLIN TN 37067

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
KAISER ALUMINUM CORP [ KALU ]

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

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	President & CEO

3. Date of Earliest Transaction (Month/Day/Year)
03/05/2026

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

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

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

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, par value $0.01 per share	03/05/2026		A		17,795(1)	A	$0(1)	121,026(2)	D
Common Stock, par value $0.01 per share	03/05/2026		A		47,895(3)	A	$0(3)	168,921(2)	D
Common Stock, par value $0.01 per share	03/05/2026		F(4)		17,722	D	$125.84	151,199(2)	D
Common Stock, par value $0.01 per share	03/05/2026		F(5)		6,859	D	$125.84	144,340(6)	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. Grant to the reporting person effective as of March 5, 2026 of restricted stock units under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on March 5, 2029 or earlier uponthe occurrence of certain specified circumstances.

2. Includes 89,994 shares acquired pursuant to grants of restricted stock units.

3. Shares earned upon the vesting on March 5, 2026 of certain performance shares granted to the reporting person in 2023 under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan. On March 5, 2026, the Registrant's compensation committee certified the performance shares payout multiplier based on the level of achievement by the Registrant of certain pre-established performance goals for 2023 through 2025.

4. Shares withheld to satisfy the withholding tax obligations resulting from the vesting on March 5, 2026 of the above-referenced performance shares.

5. Shares withheld to satisfy the withholding tax obligations resulting from the vesting on March 5, 2026 of certain restricted stock units granted to the reporting person in 2023 under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan.

6. Includes 72,565 shares acquired pursuant to grants of restricted stock units.

	/s/ Cherrie I. Tsai, with power of attorney for Keith Harvey	03/09/2026
	** 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.
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FAQ

What insider transactions did KALU President & CEO Keith Harvey report?

Keith Harvey reported equity compensation activity involving Kaiser Aluminum stock. He received 17,795 restricted stock units and 47,895 shares from performance share vesting, and had 17,722 shares and 6,859 shares withheld to satisfy tax obligations tied to those vestings.

How many Kaiser Aluminum (KALU) shares does Keith Harvey hold after this Form 4?

After the reported transactions, Keith Harvey directly holds 144,340 shares of Kaiser Aluminum common stock. This figure reflects both the new awards and the shares withheld for tax obligations related to restricted stock units and performance shares that vested on March 5, 2026.

Were Keith Harvey’s KALU stock transactions open-market buys or sales?

The reported transactions were equity awards and tax-related withholdings, not open-market trades. Shares were granted through restricted stock units and performance share vesting, while separate share amounts were withheld to cover associated tax liabilities at a stated price of $125.84 per share.

What equity awards did the KALU CEO receive under the 2021 plan?

Keith Harvey received 17,795 restricted stock units effective March 5, 2026 under the 2021 Equity and Incentive Compensation Plan. He also earned 47,895 shares upon vesting of performance shares granted in 2023, after the compensation committee certified achievement of specified multi-year performance goals.

When do the new restricted stock units for KALU’s CEO vest?

The restricted stock units granted to Keith Harvey on March 5, 2026 have restrictions that lapse on March 5, 2029. They may vest earlier only upon certain specified circumstances described in the plan, aligning his long-term compensation with Kaiser Aluminum’s multi-year performance objectives.