# EDGAR Filing Document

**Accession Number:** 0001608777
**File Stem:** 0001209191-23-016762
**Filing Date:** 2023-3
**Character Count:** 6763
**Document Hash:** c1b7973f25e8eedad465a3aa73066797
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001209191-23-016762.hdr.sgml**: 20230307

**ACCESSION NUMBER**: 0001209191-23-016762

**CONFORMED SUBMISSION TYPE**: 4

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20230305

**FILED AS OF DATE**: 20230307

**DATE AS OF CHANGE**: 20230307

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Walsh Jason
- **CENTRAL INDEX KEY:** 0001608777

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-09447
- **FILM NUMBER:** 23713077

**MAIL ADDRESS:**
- **STREET 1:** 27422 PORTOLA PKWY., SUITE 200
- **CITY:** FOOTHILL RANCH
- **STATE:** CA
- **ZIP:** 92610-2831
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** KAISER ALUMINUM CORP
- **CENTRAL INDEX KEY:** 0000811596
- **STANDARD INDUSTRIAL CLASSIFICATION:** ROLLING DRAWING & EXTRUDING OF NONFERROUS METALS [3350]
- **IRS NUMBER:** 943030279
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 27422 PORTOLA PARKWAY, SUITE 200
- **CITY:** FOOTHILL RANCH
- **STATE:** CA
- **ZIP:** 92610-2831
- **BUSINESS PHONE:** 949-614-1740

**MAIL ADDRESS:**
- **STREET 1:** 27422 PORTOLA PARKWAY, SUITE 200
- **CITY:** FOOTHILL RANCH
- **STATE:** CA
- **ZIP:** 92610-2831

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** KAISERTECH LTD
- **DATE OF NAME CHANGE:** 19901122

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## FORM 4

### STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

[ ] Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Walsh Jason<br><sub>(Last) (First) (Middle)</sub><br>1550 WEST MCEWEN DRIVE<br>SUITE 500<br><sub>(Street)</sub><br>FRANKLIN, TN 37067<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2023-03-05 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [ ] 10% Owner<br>[X] Officer (give title below) [ ] Other (specify below)<br>_EVP - Manufacturing_ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>KAISER ALUMINUM CORP [ KALU ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | 3. Transaction Code (V) | 3. Transaction Code (V) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | Code | V | Amount | (A) or (D) | Price | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| Common Stock, par value $0.01 per share | 2023-03-05 |  | A |  | 2826<sup>(1)</sup> | A | 0.00<sup>(1)</sup> | 40369<sup>(2)</sup> | D |  |
| Common Stock, par value $0.01 per share | 2023-03-05 |  | A |  | 2500<sup>(1)</sup> | A | 0.00<sup>(1)</sup> | 42869<sup>(3)</sup> | D |  |
| Common Stock, par value $0.01 per share | 2023-03-05 |  | F<sup>(4)</sup> |  | 310 | D | $84.33 | 42559<sup>(5)</sup> | D |  |

---

## Table II - Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | 4. Transaction Code (V) | 4. Transaction Code (V) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 6. Date Exercisable and Expiration Date | 6. Date Exercisable and Expiration Date | 7. Title and Amount of Underlying Securities | 7. Title and Amount of Underlying Securities | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | Code | V | (A) | (D) | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

---

### Footnotes:

(1) Grant to the reporting person effective as of March 5, 2023 of restricted stock units under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan. All restrictions will lapse on March 5, 2026 or earlier upon the occurrence of certain specified circumstances

(2) Includes 33,248 shares acquired pursuant to grants of restricted stock units.

(3) Includes 35,748 shares acquired pursuant to grants of restricted stock units.

(4) Shares withheld to satisfy the withholding tax obligations resulting from the vesting on March 5, 2023 of certain restricted stock units granted to the reporting person in 2020 under the Kaiser Aluminum Corporation 2016 Equity and Incentive Compensation Plan

(5) Includes 34,612 shares acquired pursuant to grants of restricted stock units.

**Signature:** /s/ Cherrie I. Tsai, with power of attorney for Jason D. Walsh  
**Date:** 2023-03-07

### Remarks:

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

**Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.**