Gene M. Zamiska - 27 Aug 2025 Form 4 Insider Report for WESTERN DIGITAL CORP (WDC)

Reporting relationship: SVP & Princ. Acctg Officer
Issuer ticker: WDC
Reported as of: 27 Aug 2025
Net transaction value: -$56,389
SEC form: 4
Accepted by SEC: 28 Aug 2025, 18:26:42 UTC
Prior SEC filing: 27 Aug 2025
Next SEC filing: 22 Sep 2025
Source filing: View source filing
Reporting owner signature: By: /s/ Sandra Garcia Attorney-in-Fact For: Gene Zamiska

Key filing fact

Gene M. Zamiska filed Form 4 for WESTERN DIGITAL CORP (WDC) on 28 Aug 2025.

Key facts

This page summarizes Gene M. Zamiska's Form 4 filing for WESTERN DIGITAL CORP (WDC).
4 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 28 Aug 2025, 18:26.

Change

Previous filing in this sequence was filed on 27 Aug 2025.
Current net transaction value: -$56,389.

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 0001456385 Primary reporting owner

Zamiska Gene M.

Relationship: SVP & Princ. Acctg Officer
Address: C/O WESTERN DIGITAL CORPORATION, 5601 GREAT OAKS PARKWAY, SAN JOSE
Signature: By: /s/ Sandra Garcia Attorney-in-Fact For: Gene Zamiska
Signature date: 28 Aug 2025

Reported non-derivative transactions

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

WDC transaction

Common Stock

Options Exercise

Transaction value: $0
Shares: +1
Change %: +0%
Price: $0.000000
Shares after: 28,123
Date: 27 Aug 2025
Ownership: Direct
Footnotes: F1

WDC transaction

Common Stock

Tax liability

Transaction value: $27,831
Shares: -345
Change %: -1.2%
Price: $80.67
Shares after: 27,778
Date: 27 Aug 2025
Ownership: Direct
Footnotes: F2

WDC transaction

Common Stock

Sale

Transaction value: $28,558
Shares: -353
Change %: -1.3%
Price: $80.90
Shares after: 27,425
Date: 28 Aug 2025
Ownership: Direct
Footnotes: F3

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

WDC transaction Derivative

Dividend Equivalent Rights

Options Exercise

Transaction value: $0
Shares: -1
Change %: -2.5%
Price: $0.000000
Shares after: 46
Date: 27 Aug 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 1
Exercise price
Footnotes: F1

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

Additional SEC filing notes

Filing notes and footnotes

Rule 10b5-1 trading plan

These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.

Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).

Explanation of responses 3 footnotes

Footnote F1

The dividend equivalent rights were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalent rights relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent right.

Footnote F2

Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Footnote F3

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 6, 2025.