[8-K] KAISER ALUMINUM CORP Reports Material Event

Rhea-AI Filing Summary

Kaiser Aluminum Corporation reported a leadership change in its manufacturing organization. On November 14, 2025, Executive Vice President – Manufacturing Jason D. Walsh informed the company that he will take leave for health reasons effective November 17, 2025. Thomas H. Robb, age 50, has been appointed Senior Vice President – Manufacturing and will assume Mr. Walsh’s role. Mr. Robb joined Kaiser Aluminum in August 2024 and previously served as Vice President – Finance and Packaging. The company issued a press release on November 17, 2025, to announce his appointment.

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

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): November 14, 2025

KAISER ALUMINUM CORPORATION

(Exact name of Registrant as Specified in Its Charter)

Delaware			1-09447	94-3030279
(State or Other Jurisdiction of Incorporation)			(Commission File Number)	(IRS Employer Identification No.)
1550 West McEwen Drive Suite 500
Franklin, Tennessee				37067
(Address of Principal Executive Offices)				(Zip Code)

Registrant’s Telephone Number, Including Area Code: (629) 252-7040

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class		Trading Symbol(s)		Name of each exchange on which registered
Common stock, par value $0.01 per share		KALU		Nasdaq Global Select Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

On November 14, 2025, Jason D. Walsh, the Executive Vice President – Manufacturing of Kaiser Aluminum Corporation (the “Company”), notified the Company of his decision to take leave from the Company for health reasons effective as of November 17, 2025. Thomas H. Robb has been appointed as the Company’s Senior Vice President – Manufacturing and will assume Mr. Walsh’s role.

Mr. Robb, age 50, joined the Company in August 2024 and previously served as the Company’s Vice President – Finance and Packaging.

A copy of the press release announcing the appointment of Mr. Robb is attached hereto as Exhibit 99.1 and incorporated herein by reference.

Item 9.01 Financial Statements and Exhibits.

Exhibit Number		Description
99.1		Press release dated November 17, 2025.
104		Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

			Kaiser Aluminum Corporation
Date:	November 17, 2025	By:	/s/ Cherrie I. Tsai
			Cherrie I. Tsai Vice President, Deputy General Counsel and Corporate Secretary

FAQ

What leadership change did Kaiser Aluminum (KALU) announce?

Kaiser Aluminum announced that Executive Vice President – Manufacturing Jason D. Walsh will take leave for health reasons effective November 17, 2025, and Thomas H. Robb has been appointed Senior Vice President – Manufacturing to assume his role.

Who is Thomas H. Robb and what is his background at Kaiser Aluminum (KALU)?

Thomas H. Robb, age 50, joined Kaiser Aluminum in August 2024. Before his new role as Senior Vice President – Manufacturing, he served as the company’s Vice President – Finance and Packaging.

Why is Jason D. Walsh leaving his role at Kaiser Aluminum?

Jason D. Walsh, the Executive Vice President – Manufacturing, notified Kaiser Aluminum on November 14, 2025, of his decision to take leave from the company for health reasons, effective November 17, 2025.

When does the leadership change at Kaiser Aluminum (KALU) become effective?

The change becomes effective on November 17, 2025, when Jason D. Walsh’s health-related leave begins and Thomas H. Robb assumes the manufacturing leadership role as Senior Vice President – Manufacturing.

Did Kaiser Aluminum (KALU) issue a press release about the new Senior Vice President – Manufacturing?

Yes. Kaiser Aluminum issued a press release dated November 17, 2025, announcing the appointment of Thomas H. Robb as Senior Vice President – Manufacturing, which is included as Exhibit 99.1.

Does this Kaiser Aluminum (KALU) filing include new financial information?

No. The filing focuses on management changes in the manufacturing leadership team and lists related exhibits; it does not present new financial statements or earnings data.