Kaiser Aluminum (KALU) CEO sells 47,001 shares at $175.09

Rhea-AI Filing Summary

Kaiser Aluminum Corp President & CEO Harvey Keith sold 47,001 shares of common stock in an open-market transaction on April 27, 2026. The shares were sold in multiple trades between $175.00 and $175.87 per share, with a weighted average sale price of $175.09.

Following this sale, Keith directly holds 97,339 shares of Kaiser Aluminum common stock. This remaining position includes 72,565 shares that were previously acquired through grants of restricted stock units.

Insights

Equity compensation and insider-trading analyst

Kaiser Aluminum's CEO executed a sizable open-market share sale while retaining a substantial equity stake.

The filing shows President & CEO Harvey Keith sold 47,001 shares of Kaiser Aluminum common stock in open-market transactions at a weighted average price of $175.09 per share. Trades occurred within a narrow price range of $175.00 to $175.87, indicating execution around a consistent market level.

After the sale, Keith still directly owns 97,339 shares, including 72,565 shares acquired via restricted stock unit grants. This suggests that, while the transaction reduces his exposure, he maintains a meaningful ongoing equity position. The filing does not reference a Rule 10b5-1 trading plan, so timing context comes only from this reported trade date of April 27, 2026.

Insider Trade Summary

Net Seller: 47,001 shares ($8,229,405)

Net Sell 1 txn

Insider Harvey Keith

Role President & CEO

Sold 47,001 shs ($8.23M)

Type	Security	Shares	Price	Value
Sale	Common Stock, par value $0.01 per share	47,001	$175.09	$8.23M

Holdings After Transaction: Common Stock, par value $0.01 per share — 97,339 shares (Direct, null)

Footnotes (1)

1. Represents the sale of 47,001 shares in multiple transactions, ranging from $175.00 to $175.87 per share, resulting in a weighted average sale price of $175.09 per share. The reporting person undertake to provide upon request by the SEC staff, the Registrant, or a security holder of the Registrant, full information regarding the number of shares sold at each separate price within the range. Includes 72,565 shares acquired pursuant to grants of restricted stock units.

Key Figures

Shares sold: 47,001 shares Weighted average sale price: $175.09 per share Sale price range: $175.00–$175.87 per share +2 more

5 metrics

Shares sold 47,001 shares Open-market sale on April 27, 2026

Weighted average sale price $175.09 per share Common stock, multiple transactions

Sale price range $175.00–$175.87 per share Prices across multiple trade executions

Shares owned after sale 97,339 shares Direct holdings following transaction

RSU-acquired shares in holdings 72,565 shares Portion of post-transaction holdings from RSU grants

Key Terms

open-market sale, weighted average sale price, restricted stock units, non-derivative

4 terms

open-market sale financial

"transaction_action: "open-market sale" for the 47,001-share transaction"

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

weighted average sale price financial

"resulting in a weighted average sale price of $175.09 per share"

restricted stock units financial

"Includes 72,565 shares 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.

non-derivative financial

"transaction_type: "non-derivative" for the common stock sale"

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^*

Harvey Keith

(Last) (First) (Middle)

1550 WEST MCEWEN DRIVE

SUITE 500

(Street)

FRANKLIN TENNESSEE 37067

(City) (State) (Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/27/2026

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

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

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

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	04/27/2026		S		47,001	D	$175.09(1)	97,339(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. Represents the sale of 47,001 shares in multiple transactions, ranging from $175.00 to $175.87 per share, resulting in a weighted average sale price of $175.09 per share. The reporting person undertake to provide upon request by the SEC staff, the Registrant, or a security holder of the Registrant, full information regarding the number of shares sold at each separate price within the range.

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

	/s/ Cherrie I. Tsai, with power of attorney for Keith Harvey	04/29/2026
	** 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.
* Form 4: SEC 1474 (03-26)

FAQ

What did Kaiser Aluminum (KALU) CEO Harvey Keith report in this Form 4?

Harvey Keith reported an open-market sale of Kaiser Aluminum shares. The President & CEO sold 47,001 shares of common stock on April 27, 2026, at a weighted average sale price of $175.09 per share, and disclosed his updated remaining holdings.

How many Kaiser Aluminum (KALU) shares did the CEO sell and at what prices?

The CEO sold 47,001 Kaiser Aluminum shares in multiple trades. These sales occurred in a price range from $175.00 to $175.87 per share, resulting in a weighted average sale price of $175.09 per share for the reported transaction.

How many Kaiser Aluminum (KALU) shares does the CEO hold after this sale?

After the transaction, the CEO holds 97,339 Kaiser Aluminum shares directly. This remaining position includes 72,565 shares that were previously acquired through grants of restricted stock units, as noted in the filing footnotes.

What type of transaction did Kaiser Aluminum (KALU) CEO Harvey Keith execute?

The CEO executed an open-market sale of common stock. The Form 4 identifies the transaction with code “S,” indicating a sale in open-market or private transactions, with 47,001 non-derivative common shares sold at a weighted average price of $175.09.

Were restricted stock units involved in the Kaiser Aluminum (KALU) CEO’s holdings?

Yes, restricted stock units contribute to the CEO’s reported holdings. The filing states that 72,565 of Harvey Keith’s 97,339 post-transaction shares were acquired pursuant to grants of restricted stock units awarded as part of his compensation.