KAISER ALUMINUM CORP (KALU)

Data as of Jun 5, 2026, from SEC Form 4 filings.

No open-market insider trades (90d)Watch KALU

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Latest KALU insider trades

Richard P. Grimley
Open-market sale$261K
Apr 29, 2026
Keith Harvey - Officer
Open-market sale$525K
Apr 29, 2026

About KAISER ALUMINUM CORP (KALU)

KAISER ALUMINUM CORP files with the SEC under CIK 0000811596 and is classified as rolling drawing and extruding of nonferrous metals. We track it alongside the rest of the Materials sector.

Sector: Materials

SEC filings for KALU on EDGAR

KALU Form 4 activity by transaction type, last 90 days

No Form 4 activity for KALU in the last 90 days.

KALU insider transactions (Form 4)

38 Form 4 filings on record, the earliest from Dec 6, 2024, newest first. Filing history page 1 of 2.

Date	Insider	Transaction	Security	Shares	Price	Value
Jun 4, 2026	Michael C. Arnold	Grant or award	Common Stock, par value $0.01 per share	786^{footnote F1}	$0.00^{footnote F1}	-
Footnote F1 (price, shares): Grant to the reporting person of restricted stock under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on June 4, 2027.
Jun 4, 2026	Kimberly Thompson Glas	Grant or award	Common Stock, par value $0.01 per share	786^{footnote F1}	$0.00^{footnote F1}	-
Footnote F1 (price, shares): Grant to the reporting person of restricted stock under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on June 4, 2027.
Jun 4, 2026	Donald J. Stebbins	Grant or award	Common Stock, par value $0.01 per share	786^{footnote F1}	$0.00^{footnote F1}	-
Jun 4, 2026	Donald J. Stebbins	Grant or award	Common Stock, par value $0.01 per share	631^{footnote F2}	$178.10^{footnote F3}	$112K
Footnote F1 (price, shares): Grant to the reporting person of restricted stock under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on June 4, 2027. Footnote F2 (shares): Stock received by the reporting person under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated, at such person's election in lieu of all or a portion of the reporting person's annual cash retainer for serving as a member of the… Full note on SEC EDGAR Footnote F3 (price): Equal to the average closing price of the Issuer's common stock as reported by the Nasdaq Stock Market, LLC for the 20 trading days prior to June 4, 2026.
Jun 4, 2026	Brett Wilcox	Grant or award	Common Stock, par value $0.01 per share	786^{footnote F1}	$0.00^{footnote F1}	-
Jun 4, 2026	Brett Wilcox	Grant or award	Common Stock, par value $0.01 per share	328^{footnote F2}	$178.10^{footnote F3}	$58K
Footnote F1 (price, shares): Grant to the reporting person of restricted stock under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on June 4, 2027. Footnote F2 (shares): Stock received by the reporting person under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated, at such person's election in lieu of all or a portion of the reporting person's annual cash retainer for serving as a member of the… Full note on SEC EDGAR Footnote F3 (price): Equal to the average closing price of the Issuer's common stock as reported by the Nasdaq Stock Market, LLC for the 20 trading days prior to June 4, 2026.
Jun 4, 2026	James Donald Hoffman	Grant or award	Common Stock, par value $0.01 per share	786^{footnote F1}	$0.00	-
Jun 4, 2026	James Donald Hoffman	Grant or award	Common Stock, par value $0.01 per share	589^{footnote F2}	$178.10^{footnote F3}	$105K
Footnote F1 (shares): Grant to the reporting person of restricted stock under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on June 4, 2027. Footnote F2 (shares): Stock received by the reporting person under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated, at such person's election in lieu of all or a portion of the reporting person's annual cash retainer for serving as a member of the… Full note on SEC EDGAR Footnote F3 (price): Equal to the average closing price of the Issuer's common stock as reported by the Nasdaq Stock Market, LLC for the 20 trading days prior to June 4, 2026.
Jun 4, 2026	Richard P. Grimley	Grant or award	Common Stock, par value $0.01 per share	786^{footnote F1}	$0.00^{footnote F1}	-
Footnote F1 (price, shares): Grant to the reporting person of restricted stock under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on June 4, 2027.
Jun 4, 2026	Glenda J. Minor	Grant or award	Common Stock, par value $0.01 per share	786^{footnote F1}	$0.00^{footnote F1}	-
Jun 4, 2026	Glenda J. Minor	Grant or award	Common Stock, par value $0.01 per share	335^{footnote F2}	$178.10^{footnote F3}	$60K
Footnote F1 (price, shares): Grant to the reporting person of restricted stock under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on June 4, 2027. Footnote F2 (shares): Stock received by the reporting person under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated, at such person's election in lieu of all or a portion of the reporting person's annual cash retainer for serving as a member of the… Full note on SEC EDGAR Footnote F3 (price): Equal to the average closing price of the Issuer's common stock as reported by the Nasdaq Stock Market, LLC for the 20 trading days prior to June 4, 2026.
Jun 4, 2026	David A. Foster	Grant or award	Common Stock, par value $0.01 per share	786^{footnote F1}	$0.00^{footnote F1}	-
Footnote F1 (price, shares): Grant to the reporting person of restricted stock under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on June 4, 2027.
Apr 29, 2026	Richard P. Grimley	Open-market sale	Common Stock, par value $0.01 per share	1,524	$171.52^{footnote F1}	$261K
Footnote F1 (price): Represents the sale of 1,524 shares in multiple transactions, ranging from $171.25 to $171.74 per share, resulting in a weighed average sale price of $.171.52 per share. The reporting person undertakes to provide upon request by the SEC staff, the Registrant, or a security… Full note on SEC EDGAR
Apr 29, 2026	Keith Harvey - Officer	Open-market sale	Common Stock, par value $0.01 per share	3,031	$173.13^{footnote F1}	$525K
Footnote F1 (price): Represents the sale of 3,031 shares in multiple transactions, ranging from $173.00 to $173.80 per share, resulting in a weighted average sale price of $173.13 per share. The reporting person undertake to provide upon request by the SEC staff, the Registrant, or a security holder… Full note on SEC EDGAR
Apr 27, 2026	Brett Wilcox	Open-market sale	Common Stock, par value $0.01 per share	15,000	$174.44^{footnote F1}	$2.62M
Footnote F1 (price): Represents the sale of 15,000 shares in multiple transactions, ranging from $173.60 to $175.23 per share, resulting in a weighed average sale price of $.174.44 per share. The reporting person undertakes to provide upon request by the SEC staff, the Registrant, or a security… Full note on SEC EDGAR
Apr 27, 2026	John Malcolm Donnan - Officer	Open-market sale	Common Stock, par value $0.01 per share	2,743	$178.20^{footnote F1}	$489K
Apr 28, 2026	John Malcolm Donnan - Officer	Gift	Common Stock, par value $0.01 per share	1,500	$0.00^{footnote F3}	-
Footnote F1 (price): Represents the sale of 2,743 shares in multiple transactions, ranging from $175.96 to $179.41 per share, resulting in a weighted average sale price of $178.20 per share. The reporting person undertakes to provide upon request by the SEC staff, the Registrant, or a security… Full note on SEC EDGAR Footnote F3 (price): Bona fide gift by the reporting person to a charitable trust for no consideration.
Apr 27, 2026	Iulian Gheorghe - Officer	Open-market sale	Common Stock, par value $0.01 per share	175	$174.22	$30K
Apr 28, 2026	Neal E. West - Officer	Open-market sale	Common Stock, par value $0.01 per share	5,000	$173.29	$866K
Apr 27, 2026	Keith Harvey - Officer	Open-market sale	Common Stock, par value $0.01 per share	47,001	$175.09^{footnote F1}	$8.23M
Footnote F1 (price): 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… Full note on SEC EDGAR
Mar 5, 2026	Keith Harvey - Officer	Grant or award	Common Stock, par value $0.01 per share	17,795^{footnote F1}	$0.00^{footnote F1}	-
Mar 5, 2026	Keith Harvey - Officer	Grant or award	Common Stock, par value $0.01 per share	47,895^{footnote F3}	$0.00^{footnote F3}	-
Mar 5, 2026	Keith Harvey - Officer	Tax withholding / forfeiture	Common Stock, par value $0.01 per share	17,722	$125.84	$2.23M
Mar 5, 2026	Keith Harvey - Officer	Tax withholding / forfeiture	Common Stock, par value $0.01 per share	6,859	$125.84	$863K
Footnote F1 (price, shares): Grant to the reporting person effective as of March 5, 2026 of restricted stock units under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on March 5, 2029 or earlier uponthe occurrence of certain… Full note on SEC EDGAR Footnote F3 (price, shares): Shares earned upon the vesting on March 5, 2026 of certain performance shares granted to the reporting person in 2023 under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan. On March 5, 2026, the Registrant's compensation committee certified the… Full note on SEC EDGAR
Mar 5, 2026	Thomas H. Robb - Officer	Grant or award	Common Stock, par value $0.01 per share	2,954^{footnote F1}	$0.00^{footnote F1}	-
Footnote F1 (price, shares): Grant to the reporting person effective as of March 5, 2026 of restricted stock units under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on March 5, 2029 or earlier upon the occurrence of… Full note on SEC EDGAR
Mar 5, 2026	Iulian Gheorghe - Officer	Grant or award	Common Stock, par value $0.01 per share	852^{footnote F1}	$0.00^{footnote F1}	-
Mar 5, 2026	Iulian Gheorghe - Officer	Tax withholding / forfeiture	Common Stock, par value $0.01 per share	216	$125.84	$27K
Footnote F1 (price, shares): Grant to the reporting person effective as of March 5, 2026 of restricted stock units under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on March 5, 2029 or earlier uponthe occurrence of certain… Full note on SEC EDGAR
Mar 5, 2026	Hugh J. Barger III - Officer	Grant or award	Common Stock, par value $0.01 per share	1,686^{footnote F1}	$0.00^{footnote F1}	-
Footnote F1 (price, shares): Grant to the reporting person effective as of March 5, 2026 of restricted stock units under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on March 5, 2029 or earlier upon the occurrence of… Full note on SEC EDGAR
Mar 5, 2026	Vijai Narayan - Officer	Tax withholding / forfeiture	Common Stock, par value $0.01 per share	97	$125.84	$12K
Mar 5, 2026	Vijai Narayan - Officer	Grant or award	Common Stock, par value $0.01 per share	733^{footnote F1}	$0.00^{footnote F1}	-
Mar 5, 2026	Vijai Narayan - Officer	Tax withholding / forfeiture	Common Stock, par value $0.01 per share	482	$125.84	$61K
Footnote F1 (price, shares): Grant to the reporting person effective as of March 5, 2026 of restricted stock units under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on March 5, 2029 or earlier uponthe occurrence of certain… Full note on SEC EDGAR
Mar 5, 2026	Neal E. West - Officer	Tax withholding / forfeiture	Common Stock, par value $0.01 per share	3,694	$125.84	$465K
Mar 5, 2026	Neal E. West - Officer	Tax withholding / forfeiture	Common Stock, par value $0.01 per share	1,761	$125.84	$222K
Mar 5, 2026	Neal E. West - Officer	Grant or award	Common Stock, par value $0.01 per share	3,905^{footnote F1}	$0.00^{footnote F1}	-
Mar 5, 2026	Neal E. West - Officer	Grant or award	Common Stock, par value $0.01 per share	12,296^{footnote F3}	$0.00^{footnote F3}	-
Footnote F1 (price, shares): Grant to the reporting person effective as of March 5, 2026 of restricted stock units under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on March 5, 2029 or earlier uponthe occurrence of certain… Full note on SEC EDGAR Footnote F3 (price, shares): Shares earned upon the vesting on March 5, 2026 of certain performance shares granted to the reporting person in 2023 under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan. On March 5, 2026, the Registrant's compensation committee certified the… Full note on SEC EDGAR
Mar 5, 2026	John Malcolm Donnan - Officer	Grant or award	Common Stock, par value $0.01 per share	11,649^{footnote F3}	$0.00^{footnote F3}	-
Mar 5, 2026	John Malcolm Donnan - Officer	Tax withholding / forfeiture	Common Stock, par value $0.01 per share	3,441	$125.84	$433K
Mar 5, 2026	John Malcolm Donnan - Officer	Grant or award	Common Stock, par value $0.01 per share	3,699^{footnote F1}	$0.00^{footnote F1}	-
Mar 5, 2026	John Malcolm Donnan - Officer	Tax withholding / forfeiture	Common Stock, par value $0.01 per share	1,669	$125.84	$210K
Footnote F1 (price, shares): Grant to the reporting person effective as of March 5, 2026 of restricted stock units under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on March 5, 2029 or earlier upon the occurrence of… Full note on SEC EDGAR Footnote F3 (price, shares): Shares earned upon the vesting on March 5, 2026 of certain performance shares granted to the reporting person in 2023 under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan. On March 5, 2026, the Registrant's compensation committee certified the… Full note on SEC EDGAR
Feb 23, 2026	Thomas H. Robb - Officer	Grant or award	Common Stock, par value $0.01 per share	440^{footnote F1}	$0.00^{footnote F1}	-
Footnote F1 (price, shares): Grant to the reporting person effective as of February 23, 2026 of restricted stock units under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions on 220 restricted stock units will lapse on February 23, 2029 or… Full note on SEC EDGAR
Feb 23, 2026	John Malcolm Donnan - Officer	Open-market sale	Common Stock, par value $0.01 per share	18,461	$125.08^{footnote F1}	$2.31M
Footnote F1 (price): Represents the sale of 18,461 shares in multiple transactions, raging from $125.00 to $126.39 per share, resulting in a weighted average sale price of $125.0758 per share. The reporting person undertakes to provide upon request by the SEC staff, the Registrant, or a security… Full note on SEC EDGAR
Feb 23, 2026	Neal E. West - Officer	Open-market sale	Common Stock, par value $0.01 per share	5,000	$121.72^{footnote F1}	$609K
Footnote F1 (price): Represents the sale of 5,000 shares in multiple transactions, ranging from $120.00 to $125.69 per share, resulting in a weighted average sale price of $121.72 per share. The reporting person undertakes to provide upon request by the SEC staff, the Registrant, or a security… Full note on SEC EDGAR
Feb 19, 2026	Iulian Gheorghe - Officer	Tax withholding / forfeiture	Common Stock, par value $0.01 per share	76	$127.05	$10K
Nov 21, 2025	Keith Harvey - Officer	Derivative	Common Stock, par value $0.01 per share	33,000	$90.34^{footnote F1}	$2.98M
Footnote F1 (price): Represents the sale of 33,000 shares in multiple transactions, ranging from $89.02 to $91.42 per share, resulting in a weighted average sale price of $90.34 per share. The reporting person undertakes to provide upon request by the SEC staff, the Registrant, or a security holder… Full note on SEC EDGAR
Nov 7, 2025	Blain Tiffany - Officer	Open-market sale	Common Stock, par value $0.01 per share	8,656	$93.92^{footnote F1}	$813K
Footnote F1 (price): Represents the sale of 8,656 shares in multiple transactions, raging from $93.14 to $94.805 per share, resulting in a weighted average sale price of $93.923 per share. The reporting person undertake to provide upon request by the SEC staff, the Registrant, or a security holder… Full note on SEC EDGAR
Nov 7, 2025	Vijai Narayan - Officer	Tax withholding / forfeiture	Common Stock, par value $0.01 per share	163	$94.53	$15K
Sep 18, 2025	James Donald Hoffman	Grant or award	Common Stock, par value $0.01 per share	1,363	$0.00	-
Sep 18, 2025	James Donald Hoffman	Grant or award	Common Stock, par value $0.01 per share	1,022	$77.03	$79K

Recent KALU Form 8-K filings

Read KALU company news

Oct 13, 2026Item 8.01, 9.01

Read the filing on SEC EDGAR

Aug 17, 2026Item 5.02, 7.01, 9.01

Read the filing on SEC EDGAR

Jul 22, 2026Item 2.02, 9.01

Read the filing on SEC EDGAR

Jul 13, 2026Item 8.01, 9.01

Recent KALU Form 144 notices of proposed sale

An insider files Form 144 before selling restricted or control stock. It announces a planned sale. If the sale goes ahead, it shows up later on a Form 4.

Filed	Filer	Relationship	Shares	Market value	Notice
Apr 29, 2026	-	-	-	-	View on EDGAR
Apr 28, 2026	-	-	-	-

KALU insider trading FAQ

What is the latest insider trade for KALU?

KAISER ALUMINUM CORP (KALU) has filed no insider reports in the last 90 days. The most recent on record is dated 2026-06-05. The full record for KALU runs to 38 Form 4 filings, the earliest from 2024-12-06. InsiderAlpha adds new Form 4, Form 144 and 8-K filings as they arrive from SEC EDGAR.

How many insiders are buying KALU stock?

No insider purchases of KALU were filed in the last 90 days.

How many insiders are selling KALU stock?

No insider sales of KALU were filed in the last 90 days. 10 sales are on record for this company.

Where can I see KALU SEC filings (Form 4, 10-K, 10-Q, 8-K)?

This page collects KALU Form 4 insider transactions, Form 144 sale notices and 8-K filings in one place. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.

More Materials companies with insider activity

Recent insider filings

The EDGAR links open each original Form 4, so you can check any number on this page against the filing it came from.

Jun 5, 2026 - Michael C. Arnold view on EDGAR
Jun 5, 2026 - Kimberly Thompson Glas view on EDGAR
Jun 5, 2026 - Donald J. Stebbins view on EDGAR
Jun 5, 2026 - Brett Wilcox view on EDGAR
Jun 5, 2026 - James Donald Hoffman view on EDGAR
Jun 5, 2026 - Richard P. Grimley view on EDGAR
Jun 5, 2026 - Glenda J. Minor view on EDGAR
Jun 5, 2026 - David A. Foster view on EDGAR
May 1, 2026 - Richard P. Grimley view on EDGAR

Related companies with recent insider activity

Learn more

What the Form 4 transaction codes mean: Grants, option exercises, gifts and tax withholding are not trades on the market. The codes say which is which.
Form 144 vs Form 4: A Form 144 announces a planned sale; the Form 4 reports it after it happens.
Insider activity in Materials: Where KALU's peers are being bought and sold.
Every recent Form 4: The market-wide feed, updated as filings arrive from SEC EDGAR.

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Date

Insider

Transaction

Security

Price

Value

Jun 4, 2026

Michael C. Arnold

Grant or award

Common Stock, par value $0.01 per share

786^{footnote F1}

$0.00^{footnote F1}

Footnote F1 (price, shares): Grant to the reporting person of restricted stock under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on June 4, 2027.

Jun 4, 2026

Kimberly Thompson Glas

Grant or award

Common Stock, par value $0.01 per share

786^{footnote F1}

$0.00^{footnote F1}

Footnote F1 (price, shares): Grant to the reporting person of restricted stock under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on June 4, 2027.

Jun 4, 2026

Donald J. Stebbins

Grant or award

Common Stock, par value $0.01 per share

786^{footnote F1}

$0.00^{footnote F1}

Jun 4, 2026

Donald J. Stebbins

Grant or award

Common Stock, par value $0.01 per share

631^{footnote F2}

$178.10^{footnote F3}

$112K

Footnote F1 (price, shares): Grant to the reporting person of restricted stock under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on June 4, 2027.
Footnote F2 (shares): Stock received by the reporting person under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated, at such person's election in lieu of all or a portion of the reporting person's annual cash retainer for serving as a member of the… Full note on SEC EDGAR
Footnote F3 (price): Equal to the average closing price of the Issuer's common stock as reported by the Nasdaq Stock Market, LLC for the 20 trading days prior to June 4, 2026.

Jun 4, 2026

Brett Wilcox

Grant or award

Common Stock, par value $0.01 per share

786^{footnote F1}

$0.00^{footnote F1}

Jun 4, 2026

Brett Wilcox

Grant or award

Common Stock, par value $0.01 per share

328^{footnote F2}

$178.10^{footnote F3}

$58K

Footnote F1 (price, shares): Grant to the reporting person of restricted stock under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on June 4, 2027.
Footnote F2 (shares): Stock received by the reporting person under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated, at such person's election in lieu of all or a portion of the reporting person's annual cash retainer for serving as a member of the… Full note on SEC EDGAR
Footnote F3 (price): Equal to the average closing price of the Issuer's common stock as reported by the Nasdaq Stock Market, LLC for the 20 trading days prior to June 4, 2026.

Jun 4, 2026

James Donald Hoffman

Grant or award

Common Stock, par value $0.01 per share

786^{footnote F1}

$0.00

Jun 4, 2026

James Donald Hoffman

Grant or award

Common Stock, par value $0.01 per share

589^{footnote F2}

$178.10^{footnote F3}

$105K

Footnote F1 (shares): Grant to the reporting person of restricted stock under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on June 4, 2027.
Footnote F2 (shares): Stock received by the reporting person under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated, at such person's election in lieu of all or a portion of the reporting person's annual cash retainer for serving as a member of the… Full note on SEC EDGAR
Footnote F3 (price): Equal to the average closing price of the Issuer's common stock as reported by the Nasdaq Stock Market, LLC for the 20 trading days prior to June 4, 2026.

Jun 4, 2026

Richard P. Grimley

Grant or award

Common Stock, par value $0.01 per share

786^{footnote F1}

$0.00^{footnote F1}

Footnote F1 (price, shares): Grant to the reporting person of restricted stock under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on June 4, 2027.

Jun 4, 2026

Glenda J. Minor

Grant or award

Common Stock, par value $0.01 per share

786^{footnote F1}

$0.00^{footnote F1}

Jun 4, 2026

Glenda J. Minor

Grant or award

Common Stock, par value $0.01 per share

335^{footnote F2}

$178.10^{footnote F3}

$60K

Footnote F1 (price, shares): Grant to the reporting person of restricted stock under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on June 4, 2027.
Footnote F2 (shares): Stock received by the reporting person under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated, at such person's election in lieu of all or a portion of the reporting person's annual cash retainer for serving as a member of the… Full note on SEC EDGAR
Footnote F3 (price): Equal to the average closing price of the Issuer's common stock as reported by the Nasdaq Stock Market, LLC for the 20 trading days prior to June 4, 2026.

Jun 4, 2026

David A. Foster

Grant or award

Common Stock, par value $0.01 per share

786^{footnote F1}

$0.00^{footnote F1}

Footnote F1 (price, shares): Grant to the reporting person of restricted stock under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on June 4, 2027.

Apr 29, 2026

Richard P. Grimley

Open-market sale

Common Stock, par value $0.01 per share

1,524

$171.52^{footnote F1}

$261K

Footnote F1 (price): Represents the sale of 1,524 shares in multiple transactions, ranging from $171.25 to $171.74 per share, resulting in a weighed average sale price of $.171.52 per share. The reporting person undertakes to provide upon request by the SEC staff, the Registrant, or a security… Full note on SEC EDGAR

Apr 29, 2026

Keith Harvey - Officer

Open-market sale

Common Stock, par value $0.01 per share

3,031

$173.13^{footnote F1}

$525K

Footnote F1 (price): Represents the sale of 3,031 shares in multiple transactions, ranging from $173.00 to $173.80 per share, resulting in a weighted average sale price of $173.13 per share. The reporting person undertake to provide upon request by the SEC staff, the Registrant, or a security holder… Full note on SEC EDGAR

Apr 27, 2026

Brett Wilcox

Open-market sale

Common Stock, par value $0.01 per share

15,000

$174.44^{footnote F1}

$2.62M

Footnote F1 (price): Represents the sale of 15,000 shares in multiple transactions, ranging from $173.60 to $175.23 per share, resulting in a weighed average sale price of $.174.44 per share. The reporting person undertakes to provide upon request by the SEC staff, the Registrant, or a security… Full note on SEC EDGAR

Apr 27, 2026

John Malcolm Donnan - Officer

Open-market sale

Common Stock, par value $0.01 per share

2,743

$178.20^{footnote F1}

$489K

Apr 28, 2026

John Malcolm Donnan - Officer

Gift

Common Stock, par value $0.01 per share

1,500

$0.00^{footnote F3}

Footnote F1 (price): Represents the sale of 2,743 shares in multiple transactions, ranging from $175.96 to $179.41 per share, resulting in a weighted average sale price of $178.20 per share. The reporting person undertakes to provide upon request by the SEC staff, the Registrant, or a security… Full note on SEC EDGAR
Footnote F3 (price): Bona fide gift by the reporting person to a charitable trust for no consideration.

Apr 27, 2026

Iulian Gheorghe - Officer

Open-market sale

Common Stock, par value $0.01 per share

175

$174.22

$30K

Apr 28, 2026

Neal E. West - Officer

Open-market sale

Common Stock, par value $0.01 per share

5,000

$173.29

$866K

Apr 27, 2026

Keith Harvey - Officer

Open-market sale

Common Stock, par value $0.01 per share

47,001

$175.09^{footnote F1}

$8.23M

Footnote F1 (price): 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… Full note on SEC EDGAR

Mar 5, 2026

Keith Harvey - Officer

Grant or award

Common Stock, par value $0.01 per share

17,795^{footnote F1}

$0.00^{footnote F1}

Mar 5, 2026

Keith Harvey - Officer

Grant or award

Common Stock, par value $0.01 per share

47,895^{footnote F3}

$0.00^{footnote F3}

Mar 5, 2026

Keith Harvey - Officer

Tax withholding / forfeiture

Common Stock, par value $0.01 per share

17,722

$125.84

$2.23M

Mar 5, 2026

Keith Harvey - Officer

Tax withholding / forfeiture

Common Stock, par value $0.01 per share

6,859

$125.84

$863K

Footnote F1 (price, shares): Grant to the reporting person effective as of March 5, 2026 of restricted stock units under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on March 5, 2029 or earlier uponthe occurrence of certain… Full note on SEC EDGAR
Footnote F3 (price, shares): Shares earned upon the vesting on March 5, 2026 of certain performance shares granted to the reporting person in 2023 under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan. On March 5, 2026, the Registrant's compensation committee certified the… Full note on SEC EDGAR

Mar 5, 2026

Thomas H. Robb - Officer

Grant or award

Common Stock, par value $0.01 per share

2,954^{footnote F1}

$0.00^{footnote F1}

Footnote F1 (price, shares): Grant to the reporting person effective as of March 5, 2026 of restricted stock units under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on March 5, 2029 or earlier upon the occurrence of… Full note on SEC EDGAR

Mar 5, 2026

Iulian Gheorghe - Officer

Grant or award

Common Stock, par value $0.01 per share

852^{footnote F1}

$0.00^{footnote F1}

Mar 5, 2026

Iulian Gheorghe - Officer

Tax withholding / forfeiture

Common Stock, par value $0.01 per share

216

$125.84

$27K

Footnote F1 (price, shares): Grant to the reporting person effective as of March 5, 2026 of restricted stock units under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on March 5, 2029 or earlier uponthe occurrence of certain… Full note on SEC EDGAR

Mar 5, 2026

Hugh J. Barger III - Officer

Grant or award

Common Stock, par value $0.01 per share

1,686^{footnote F1}

$0.00^{footnote F1}

Footnote F1 (price, shares): Grant to the reporting person effective as of March 5, 2026 of restricted stock units under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on March 5, 2029 or earlier upon the occurrence of… Full note on SEC EDGAR

Mar 5, 2026

Vijai Narayan - Officer

Tax withholding / forfeiture

Common Stock, par value $0.01 per share

$125.84

$12K

Mar 5, 2026

Vijai Narayan - Officer

Grant or award

Common Stock, par value $0.01 per share

733^{footnote F1}

$0.00^{footnote F1}

Mar 5, 2026

Vijai Narayan - Officer

Tax withholding / forfeiture

Common Stock, par value $0.01 per share

482

$125.84

$61K

Footnote F1 (price, shares): Grant to the reporting person effective as of March 5, 2026 of restricted stock units under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on March 5, 2029 or earlier uponthe occurrence of certain… Full note on SEC EDGAR

Mar 5, 2026

Neal E. West - Officer

Tax withholding / forfeiture

Common Stock, par value $0.01 per share

3,694

$125.84

$465K

Mar 5, 2026

Neal E. West - Officer

Tax withholding / forfeiture

Common Stock, par value $0.01 per share

1,761

$125.84

$222K

Mar 5, 2026

Neal E. West - Officer

Grant or award

Common Stock, par value $0.01 per share

3,905^{footnote F1}

$0.00^{footnote F1}

Mar 5, 2026

Neal E. West - Officer

Grant or award

Common Stock, par value $0.01 per share

12,296^{footnote F3}

$0.00^{footnote F3}

Footnote F1 (price, shares): Grant to the reporting person effective as of March 5, 2026 of restricted stock units under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on March 5, 2029 or earlier uponthe occurrence of certain… Full note on SEC EDGAR
Footnote F3 (price, shares): Shares earned upon the vesting on March 5, 2026 of certain performance shares granted to the reporting person in 2023 under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan. On March 5, 2026, the Registrant's compensation committee certified the… Full note on SEC EDGAR

Mar 5, 2026

John Malcolm Donnan - Officer

Grant or award

Common Stock, par value $0.01 per share

11,649^{footnote F3}

$0.00^{footnote F3}

Mar 5, 2026

John Malcolm Donnan - Officer

Tax withholding / forfeiture

Common Stock, par value $0.01 per share

3,441

$125.84

$433K

Mar 5, 2026

John Malcolm Donnan - Officer

Grant or award

Common Stock, par value $0.01 per share

3,699^{footnote F1}

$0.00^{footnote F1}

Mar 5, 2026

John Malcolm Donnan - Officer

Tax withholding / forfeiture

Common Stock, par value $0.01 per share

1,669

$125.84

$210K

Footnote F1 (price, shares): Grant to the reporting person effective as of March 5, 2026 of restricted stock units under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on March 5, 2029 or earlier upon the occurrence of… Full note on SEC EDGAR
Footnote F3 (price, shares): Shares earned upon the vesting on March 5, 2026 of certain performance shares granted to the reporting person in 2023 under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan. On March 5, 2026, the Registrant's compensation committee certified the… Full note on SEC EDGAR

Feb 23, 2026

Thomas H. Robb - Officer

Grant or award

Common Stock, par value $0.01 per share

440^{footnote F1}

$0.00^{footnote F1}

Footnote F1 (price, shares): Grant to the reporting person effective as of February 23, 2026 of restricted stock units under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions on 220 restricted stock units will lapse on February 23, 2029 or… Full note on SEC EDGAR

Feb 23, 2026

John Malcolm Donnan - Officer

Open-market sale

Common Stock, par value $0.01 per share

18,461

$125.08^{footnote F1}

$2.31M

Footnote F1 (price): Represents the sale of 18,461 shares in multiple transactions, raging from $125.00 to $126.39 per share, resulting in a weighted average sale price of $125.0758 per share. The reporting person undertakes to provide upon request by the SEC staff, the Registrant, or a security… Full note on SEC EDGAR

Feb 23, 2026

Neal E. West - Officer

Open-market sale

Common Stock, par value $0.01 per share

5,000

$121.72^{footnote F1}

$609K

Footnote F1 (price): Represents the sale of 5,000 shares in multiple transactions, ranging from $120.00 to $125.69 per share, resulting in a weighted average sale price of $121.72 per share. The reporting person undertakes to provide upon request by the SEC staff, the Registrant, or a security… Full note on SEC EDGAR

Feb 19, 2026

Iulian Gheorghe - Officer

Tax withholding / forfeiture

Common Stock, par value $0.01 per share

$127.05

$10K

Nov 21, 2025

Keith Harvey - Officer

Derivative

Common Stock, par value $0.01 per share

33,000

$90.34^{footnote F1}

$2.98M

Footnote F1 (price): Represents the sale of 33,000 shares in multiple transactions, ranging from $89.02 to $91.42 per share, resulting in a weighted average sale price of $90.34 per share. The reporting person undertakes to provide upon request by the SEC staff, the Registrant, or a security holder… Full note on SEC EDGAR

Nov 7, 2025

Blain Tiffany - Officer

Open-market sale

Common Stock, par value $0.01 per share

8,656

$93.92^{footnote F1}

$813K

Footnote F1 (price): Represents the sale of 8,656 shares in multiple transactions, raging from $93.14 to $94.805 per share, resulting in a weighted average sale price of $93.923 per share. The reporting person undertake to provide upon request by the SEC staff, the Registrant, or a security holder… Full note on SEC EDGAR

Nov 7, 2025

Vijai Narayan - Officer

Tax withholding / forfeiture

Common Stock, par value $0.01 per share

163

$94.53

$15K

Sep 18, 2025

James Donald Hoffman

Grant or award

Common Stock, par value $0.01 per share

1,363

$0.00

Sep 18, 2025

James Donald Hoffman

Grant or award

Common Stock, par value $0.01 per share

1,022

$77.03

$79K

Filed

Filer

Relationship

Market value

Notice

Apr 29, 2026

View on EDGAR

Apr 28, 2026