Matthew E. Massengill - 20 Nov 2025 Form 4 Insider Report for WESTERN DIGITAL CORP (WDC)

Reporting relationship: Director
Issuer ticker: WDC
Reported as of: 20 Nov 2025
Net transaction value: $0
SEC form: 4
Accepted by SEC: 21 Nov 2025, 17:31:55 UTC
Prior SEC filing: 22 Sep 2025
Next SEC filing: 22 Dec 2025
Source filing: View source filing
Reporting owner signature: By: /s/ Sandra Garcia Attorney-in-Fact For: Matthew E. Massengill

Key filing fact

Matthew E. Massengill filed Form 4 for WESTERN DIGITAL CORP (WDC) on 21 Nov 2025.

Key facts

This page summarizes Matthew E. Massengill's Form 4 filing for WESTERN DIGITAL CORP (WDC).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 21 Nov 2025, 17:31.

Change

Previous filing in this sequence was filed on 22 Sep 2025.
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 0001232826 Primary reporting owner

MASSENGILL MATTHEW E

Relationship: Director
Address: C/O WESTERN DIGITAL CORPORATION, 5601 GREAT OAKS PARKWAY, SAN JOSE
Signature: By: /s/ Sandra Garcia Attorney-in-Fact For: Matthew E. Massengill
Signature date: 21 Nov 2025

Reported non-derivative transactions

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

WDC transaction

Common Stock

Award

Transaction value: $0
Shares: +1,585
Change %: +5.8%
Price: $0.000000
Shares after: 28,897
Date: 20 Nov 2025
Ownership: Direct
Footnotes: F1, F2

WDC holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 36,926
Date: 20 Nov 2025
Ownership: By Family Trust

WDC holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 500
Date: 20 Nov 2025
Ownership: by IRA

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

Represents the grant of restricted stock units to the Reporting Person. Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock.

Footnote F2

Includes 8,508 additional stock units acquired by the Reporting Person in connection with the Issuer's spin-off (the "Spin-Off") of a then-wholly owned subsidiary of the Issuer on February 21, 2025. Pursuant to an Employee Matters Agreement, at the effective time of the Spin-Off, each outstanding Issuer stock unit was adjusted and converted into additional stock units based on the equity conversion ratio of 1.452526 per every Issuer stock unit.