Kaiser Aluminum (KALU) EVP granted 2,954 restricted stock units in Form 4

Rhea-AI Filing Summary

Robb Thomas H. reported acquisition or exercise transactions in this Form 4 filing.

Kaiser Aluminum Corporation executive Thomas H. Robb, EVP – Manufacturing, received a grant of 2,954 shares of common stock in the form of restricted stock units under the company’s 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions on these units are scheduled to lapse on March 5, 2029, or earlier upon certain specified circumstances, and following this award he directly holds 17,898 shares of common stock.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Robb Thomas H.

Role EVP - Manufacturing

Type	Security	Shares	Price	Value
Grant/Award	Common Stock, par value $0.01 per share	2,954	$0.00	--

Holdings After Transaction: Common Stock, par value $0.01 per share — 17,898 shares (Direct)

Footnotes (1)

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 upon the occurrence of certain specified circumstances. Shares acquired pursuant to grants of restricted stock units.

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Form 4 Insider Transactions: What Each Field Means →

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^*

Robb Thomas H.

(Last) (First) (Middle)

1550 W. 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 - Manufacturing

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		2,954(1)	A	$0(1)	17,898(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. 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 upon the occurrence of certain specified circumstances.

2. Shares acquired pursuant to grants of restricted stock units.

	/s/ Cherrie I. Tsai, with power of attorney for Thomas H. Robb	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.
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.

FAQ

What insider transaction did Kaiser Aluminum (KALU) report for Thomas H. Robb?

Kaiser Aluminum reported that Thomas H. Robb, EVP – Manufacturing, acquired 2,954 shares of common stock through a grant of restricted stock units. These units were issued under the 2021 Equity and Incentive Compensation Plan, as amended and restated, with restrictions that lapse over time.

How many Kaiser Aluminum (KALU) shares did Thomas H. Robb hold after this Form 4 transaction?

After the reported transaction, Thomas H. Robb directly held 17,898 shares of Kaiser Aluminum common stock. This total includes the newly granted 2,954 restricted stock units, which are structured as common stock with restrictions that will lapse on a future date.

What type of equity award did Kaiser Aluminum (KALU) grant to Thomas H. Robb?

Thomas H. Robb received a grant of restricted stock units representing 2,954 shares of Kaiser Aluminum common stock. The award was made under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated, and was categorized as a grant, award, or other acquisition.

When do the restrictions on Thomas H. Robb’s Kaiser Aluminum (KALU) restricted stock units lapse?

All restrictions on Thomas H. Robb’s restricted stock units are scheduled to lapse on March 5, 2029. The footnotes also state the restrictions may lapse earlier if certain specified circumstances occur, consistent with the terms of the company’s equity plan.

Was the Kaiser Aluminum (KALU) equity grant to Thomas H. Robb a purchase or an award?

The transaction was reported as a grant or award acquisition, not an open-market purchase. The Form 4 shows transaction code “A” with a price per share of 0.0000, indicating shares were acquired pursuant to grants of restricted stock units rather than being bought for cash.

How is ownership characterized for Thomas H. Robb’s new Kaiser Aluminum (KALU) shares?

The Form 4 identifies Thomas H. Robb’s ownership of these shares as direct. The filing lists the ownership type as “direct” with code “D,” reflecting that the restricted stock units and resulting common shares are held directly by the reporting person.