Western Digital (WDC)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-03-18 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: WESTERN DIGITAL CORP (WDC) CIK: 0000106040 --- Reporting Owner --- Name: MASSENGILL MATTHEW E CIK: 0001232826 Role: Director --- Derivative Transactions --- [Transaction #1] Security: Dividend Equivalent Rights Date: 2026-03-18 | Code: A (Grant or award) Shares: +11.8849 | Price: $0.00 Shares Owned After: 104.7371 | Ownership: D (Direct) Footnotes: [F1] The dividend equivalent rights accrued on previously awarded restricted stock units (RSUs) which vest proportionately with the RSUs to which they relate. Each dividend equivalent right represents a contingent right to receive one share of the Issuer's common stock or the cash value thereof. [F1] The dividend equivalent rights accrued on previously awarded restricted stock units (RSUs) which vest proportionately with the RSUs to which they relate. Each dividend equivalent right represents a contingent right to receive one share of the Issuer's common stock or the cash value thereof. [F1] The dividend equivalent rights accrued on previously awarded restricted stock units (RSUs) which vest proportionately with the RSUs to which they relate. Each dividend equivalent right represents a contingent right to receive one share of the Issuer's common stock or the cash value thereof. --- Footnotes (Complete Index) --- F1: The dividend equivalent rights accrued on previously awarded restricted stock units (RSUs) which vest proportionately with the RSUs to which they relate. Each dividend equivalent right represents a contingent right to receive one share of the Issuer's common stock or the cash value thereof. --- Signature --- /s/ By: /s/ Sandra Garcia Attorney-in-Fact For: Matthew Massengill (2026-03-19)