Kaiser Aluminum EVP reports 5,604-share holding

On October 1, 2026, Jennifer Kristi Preston, Kaiser Aluminum Corp. (KALU)’s EVP, Human Resources & Labor, reported direct ownership of 5,604 shares of common stock.

Rhea-AI Filing Summary

On October 1, 2026, Jennifer Kristi Preston, Kaiser Aluminum Corp. (KALU)’s EVP, Human Resources & Labor, reported direct ownership of 5,604 shares of common stock. The reported total includes 3,346 shares acquired pursuant to grants of restricted stock units. The common stock has a par value of $0.01 per share.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Preston Jennifer Kristi

Role EVP, Human Resources & Labor

Type	Security	Shares	Price	Value
holding	Common Stock, par value $0.01 per share F1	--	--	--

Holdings After Transaction: Common Stock, par value $0.01 per share — 5,604 shares (Direct)

Footnotes (1)

1. F1. Includes 3,346 shares acquired pursuant to grants of restricted stock units.

Key Figures

Direct common stock holdings: 5,604 shares Shares acquired through restricted stock unit grants: 3,346 shares Common stock par value: $0.01 per share

3 metrics

Direct common stock holdings 5,604 shares Reported October 1, 2026

Shares acquired through restricted stock unit grants 3,346 shares Included in reported common stock holdings

Common stock par value $0.01 per share Kaiser Aluminum Corp. common stock

Key Terms

restricted stock units, par value

2 terms

restricted stock units financial

"acquired pursuant to grants 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.

par value financial

"Common Stock, par value $0.01 per share"

Par value is the fixed amount printed on a bond or stock that represents its original value when issued. It’s like the face value of a coin or bill—what the issuer promises to pay back or the starting price of a stock—though it often doesn’t change with market prices. It matters because it helps determine certain financial details, like how much the company will pay back at maturity.

FAQ

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

How many KALU shares does Jennifer Kristi Preston report holding?

Jennifer Kristi Preston, Kaiser Aluminum Corp.’s EVP, Human Resources & Labor, reports direct ownership of 5,604 shares of common stock. The reported total includes 3,346 shares acquired pursuant to grants of restricted stock units.

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

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Available on EDGAR 10/02/2026 - 05:22 PM Accepted by SEC EDGAR 10/02/2026 - 05:22 PM Learn about SEC filing dates

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

OMB APPROVAL

OMB Number:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

Preston Jennifer Kristi

(Last) (First) (Middle)

C/O KAISER, 1550 W. MCEWEN DR., #500

(Street)

FRANKLIN TENNESSEE 37067

(City) (State) (Zip)

UNITED STATES

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
10/01/2026

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

3a. Foreign Trading Symbol

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

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP, Human Resources & Labor

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	5,604(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 3,346 shares acquired pursuant to grants of restricted stock units.

	/s/ Cherrie I. Tsai, with power of attorney for Jennifer Preston	10/02/2026
	** 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.
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 3: SEC 1473 (03-26)