Kaiser Aluminum (KALU) EVP discloses 14,504 common shares held ownership

Rhea-AI Filing Summary

Kaiser Aluminum Corporation executive Thomas H. Robb, EVP - Manufacturing, filed an initial ownership report showing his beneficial holdings in the company’s common stock as of 12/16/2025. The filing lists 14,504 shares of common stock, held directly.

A footnote explains that these 14,504 shares were acquired pursuant to grants of restricted stock units, meaning prior equity awards have settled into shares now reported as owned. The Form 3 serves as a baseline disclosure of Robb’s equity position in Kaiser Aluminum rather than a record of a new stock transaction.

SEC Form 3

FORM 3

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

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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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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. Date of Event Requiring Statement (Month/Day/Year)
12/16/2025

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

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP - Manufacturing

5. 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 Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock, par value $0.01 per share	14,504(1)	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Includes 14,504 shares acquired pursuant to grants of restricted stock units.

	/s/ Cherrie I. Tsai, with power of attorney for Thomas H. Robb	01/14/2026
	** 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 5 (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

Who is the reporting person in Kaiser Aluminum (KALU)'s Form 3 filing?

The reporting person is Thomas H. Robb, who serves as EVP - Manufacturing of Kaiser Aluminum Corporation.

How many Kaiser Aluminum (KALU) shares does Thomas H. Robb report owning?

He reports beneficial ownership of 14,504 shares of Kaiser Aluminum common stock, par value $0.01 per share, held directly.

What type of security is reported in this Kaiser Aluminum (KALU) Form 3?

The filing reports ownership of Common Stock, par value $0.01 per share of Kaiser Aluminum Corporation.

How were the 14,504 Kaiser Aluminum (KALU) shares acquired by Thomas H. Robb?

A footnote states that the holdings include 14,504 shares acquired pursuant to grants of restricted stock units.

Does this Kaiser Aluminum (KALU) Form 3 report any derivative securities?

The section for derivative securities is present but shows no derivative positions listed for Thomas H. Robb.

Is Thomas H. Robb’s ownership in Kaiser Aluminum (KALU) direct or indirect?

The Form 3 indicates the 14,504 shares are held directly, with the ownership form shown as "D" (direct).