Insider sale reported by Kaiser Aluminum (NASDAQ: KALU) — Form 144

Rhea-AI Filing Summary

Kaiser Aluminum reports proposed sales of common stock on a Form 144 covering multiple grants and awards. The filing lists specific lots of common shares to be sold, including 13,018 and 1,052 share lots, with an effective/filing date of 02/23/2026.

Insights

Corporate Governance Analyst

Routine Form 144 sale notification; limited immediate impact.

The filing lists proposed dispositions of common stock tied to RSUs and PSA awards, with examples including 13,018 and 1,052 share lots. These appear as scheduled or planned disposals reported under the regulatory requirement.

Cash proceeds recipient is listed as cash for each lot; timing and aggregate proceeds are not provided in the excerpt. Subsequent filings or broker reports would show completed trade details.

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK
Filer CCC
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.

Relationship to Issuer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
common	UBS Financial Services Inc 1000 Harbor Blvd 3rd Floor Weehawken NJ 07086	15231	1874879.2	16210443	02/23/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
common	03/05/2025	RSU	Kaiser Aluminum			1052	02/23/2026	cash
common	03/05/2025	PSA	Kaiser Aluminum			675	02/23/2026	cash
common	03/05/2025	RSU	Kaiser Aluminum			486	02/23/2026	cash
common	08/12/2025	RSU	Kaiser Aluminum			13018	02/23/2026	cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Nothing to Report

144: Remarks and Signature

Remarks

Date of Notice

ATTENTION:

The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.

Signature

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What does Kaiser Aluminum's (KALU) Form 144 report?

The Form 144 reports proposed sales of common stock, including RSU and PSA lots. The excerpt lists share lots such as 13,018 and 1,052, with a filing date of 02/23/2026.

Does the filing state who will receive the cash from KALU sales?

Yes; the excerpt indicates the payment type as cash for each listed lot. The filing does not name a beneficiary or specify proceeds amounts in this excerpt.

Are the listed securities in the Form 144 already sold for KALU?

The filing shows securities "To Be Sold" and includes past three months sections. Example lots are listed as planned disposals; completion and trade execution details are not included here.

What types of awards are being disposed under the Form 144 for KALU?

The excerpt lists award types including RSU and PSA (performance/share awards). Specific grant dates shown include 03/05/2025 and 08/12/2025 for certain lots.

Where is Kaiser Aluminum listed in this filing extract?

The extract shows the exchange as NASDAQ and references the issuer as Kaiser Aluminum with the filing date 02/23/2026 in the header information.