Richard P. Grimley - 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, 17:46:10 UTC
Prior SEC filing: 01 May 2026
Source filing: View source filing
Reporting owner signature: /s/ John M. Donnan, with power of attorney for Richard P. Grimley

Key filing fact

Richard P. Grimley filed Form 4 for KAISER ALUMINUM CORP (KALU) on 05 Jun 2026.

Key facts

This page summarizes Richard P. Grimley's Form 4 filing for KAISER ALUMINUM CORP (KALU).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 05 Jun 2026, 17:46.

Change

Previous filing in this sequence was filed on 01 May 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 0001972491 Primary reporting owner

Grimley Richard P.

Relationship: Director
Address: 1550 WEST MCEWEN DRIVE, SUITE 500, FRANKLIN
Signature: /s/ John M. Donnan, with power of attorney for Richard P. Grimley
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 %: +17%
Price: $0.000000^*
Shares after: 5,364
Date: 04 Jun 2026
Ownership: Direct
Footnotes: F1

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

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.