Brett Wilcox - 04 Jun 2026 Form 4 Insider Report for KAISER ALUMINUM CORP (KALU)

Reporting relationship: Director
Issuer ticker: KALU
Reported as of: 04 Jun 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 05 Jun 2026, 17:50:56 UTC
Prior SEC filing: 29 Apr 2026
Source filing: View source filing
Reporting owner signature: /s/ Cherrie I. Tsai, with power of attorney for Brett Wilcox

Key filing fact

Brett Wilcox filed Form 4 for KAISER ALUMINUM CORP (KALU) on 05 Jun 2026.

Key facts

This page summarizes Brett Wilcox's Form 4 filing for KAISER ALUMINUM CORP (KALU).
2 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 05 Jun 2026, 17:50.

Change

Previous filing in this sequence was filed on 29 Apr 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001289226 Primary reporting owner

Wilcox Brett

Relationship: Director
Address: 1550 WEST MCEWEN DRIVE, SUITE 500, FRANKLIN
Signature: /s/ Cherrie I. Tsai, with power of attorney for Brett Wilcox
Signature date: 05 Jun 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

KALU transaction

Common Stock, par value $0.01 per share

Award

Transaction value
Shares: +786
Change %: +41%
Price: $0.000000^*
Shares after: 2,691
Date: 04 Jun 2026
Ownership: Direct
Footnotes: F1

KALU transaction

Common Stock, par value $0.01 per share

Award

Transaction value
Shares: +328
Change %: +12%
Price: $178.10^*
Shares after: 3,019
Date: 04 Jun 2026
Ownership: Direct
Footnotes: F2, F3

KALU holding

Common Stock, par value $0.01 per share

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 9,887
Date: 04 Jun 2026
Ownership: By Wilcox Revocable Trust

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 3 footnotes

Footnote F1

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

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 Board of Directors of Kaiser Aluminum Corporation and chair or a member of one or more committees of the Board of Directors.

Footnote F3

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.