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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

\n \n \n \n \n \n

Date of Report (Date of earliest event reported): October 13, 2026

KAISER ALUMINUM CORPORATION

(Exact name of Registrant as Specified in Its Charter)

\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n

\n	\n	\n	\n	\n
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)

\n \n \n \n \n \n

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

\n \n \n \n \n \n

(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:

\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n

\n	\n	\n	\n	\n
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 8.01 Other Events.

On October 13, 2026, Kaiser Aluminum Corporation announced that its board of directors declared a quarterly cash dividend on its common stock of $0.77 per share. The dividend will be payable on November 13, 2026 to stockholders of record as of the close of business on October 23, 2026. A copy of the press release is attached hereto as Exhibit 99.1.

The information contained in the press release shall not be deemed to be \"filed\" for purposes of Section 18 of the Securities Exchange Act of 1934 (\"Exchange Act\"), or otherwise subject to liability of that section. In addition, this information shall not be incorporated by reference into any registration statement or other document filed under the Securities Act, or the Exchange Act, regardless of any general incorporation language in such filing, except as shall be expressly set forth by specific reference in the filing.

Item 9.01 Financial Statements and Exhibits.

\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n

\n	\n	\n
Exhibit Number		Description
99.1		Press release dated October 13, 2026.
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.

\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n

\n	\n	\n	\n
			Kaiser Aluminum Corporation

Date:	October 13, 2026	By:	/s/ Cherrie I. Tsai
			Cherrie I. Tsai Vice President, Deputy General Counsel and Corporate Secretary

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