Kaiser Aluminum (KALU) CFO logs stock grants and tax share disposals

Rhea-AI Filing Summary

Kaiser Aluminum Corporation EVP & CFO Neal E. West reported multiple equity-related transactions in the company’s common stock. On March 5, 2026, he received 3,905 restricted stock units under the 2021 Equity and Incentive Compensation Plan, with restrictions scheduled to lapse on March 5, 2029, subject to specified conditions.

He also acquired 12,296 shares earned from performance shares granted in 2023, after the compensation committee certified achievement of 2023–2025 performance goals. To cover withholding taxes from these vestings, 3,694 shares and 1,761 shares were disposed at $125.84 per share. Following these transactions, he directly owned 29,706 shares, and an additional 12,775 shares were held indirectly by the West Family Trust.

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^*

West Neal E

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP & CFO

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		3,905(1)	A	$0(1)	22,865(2)	D
Common Stock, par value $0.01 per share	03/05/2026		A		12,296(3)	A	$0(3)	35,161(2)	D
Common Stock, par value $0.01 per share	03/05/2026		F(4)		3,694	D	$125.84	31,467(2)	D
Common Stock, par value $0.01 per share	03/05/2026		F(5)		1,761	D	$125.84	29,706(6)	D
Common Stock, par value $0.01 per share								12,775	I	By West Family Trust

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 22,865 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 18,390 shares acquired pursuant to grants of restricted stock units.

	/s/ Cherrie I. Tsai, with power of attorney for Neal E. West	03/05/2026
	** 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).
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FAQ

What did Kaiser Aluminum (KALU) EVP & CFO Neal West report on this Form 4?

Neal E. West reported equity awards and related tax-withholding transactions in Kaiser Aluminum common stock. He received restricted stock units, earned performance shares from a prior grant, and had shares withheld to satisfy tax obligations linked to those vestings.

How many Kaiser Aluminum (KALU) restricted stock units were granted to Neal West?

He was granted 3,905 restricted stock units effective March 5, 2026. These units were issued under Kaiser Aluminum’s 2021 Equity and Incentive Compensation Plan, with all restrictions scheduled to lapse on March 5, 2029, or earlier upon certain specified circumstances described in the plan.

What performance-based shares did Neal West earn in this Kaiser Aluminum (KALU) filing?

He acquired 12,296 shares earned from performance shares granted in 2023. The compensation committee certified the payout on March 5, 2026, based on Kaiser Aluminum’s achievement of pre-established performance goals covering the 2023 through 2025 performance period.

Why were some Kaiser Aluminum (KALU) shares disposed of in Neal West’s Form 4?

A total of 3,694 shares and 1,761 shares were disposed in transactions coded “F.” These transactions reflect shares withheld at $125.84 per share to satisfy withholding tax obligations arising from the vesting of performance shares and restricted stock units on March 5, 2026.

How many Kaiser Aluminum (KALU) shares does Neal West own after these transactions?

After the reported transactions, he directly owned 29,706 shares of Kaiser Aluminum common stock. In addition, 12,775 shares were held indirectly by the West Family Trust, as indicated by the indirect ownership entry labeled “By West Family Trust.”

What is the role of the West Family Trust in Neal West’s Kaiser Aluminum (KALU) holdings?

The West Family Trust holds 12,775 Kaiser Aluminum shares as an indirect ownership position. The Form 4 identifies this block as indirectly owned with the notation “By West Family Trust,” distinguishing it from Neal West’s directly held common stock holdings.