Western Digital (WDC)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-03-17 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: WESTERN DIGITAL CORP (WDC) CIK: 0000106040 --- Reporting Owner --- Name: Shihab Ahmed Mohammed CIK: 0002059396 Role: Officer (Chief Product Officer) --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-03-17 | Code: M (Exercise of derivative) Shares: +196 | Price: $0.00 Shares Owned After: 184,914 | Ownership: D (Direct) Footnotes: [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. [F2] Includes 484 shares acquired under the Issuer's Employee Stock Purchase Plan on November 30, 2025. [Transaction #2] Security: Common Stock Date: 2026-03-17 | Code: F (Payment of exercise/tax) Shares: -20,595 | Price: $313.81 Total Value: $6,462,916.95 Shares Owned After: 164,319 | Ownership: D (Direct) Footnotes: [F3] Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e). --- Derivative Transactions --- [Transaction #1] Security: Dividend Equivalent Rights Date: 2026-03-17 | Code: M (Exercise of derivative) Shares: -196.5574 | Price: $0.00 Shares Owned After: 375.0821 | Ownership: D (Direct) Footnotes: [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. [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. [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. [Transaction #2] Security: Dividend Equivalent Rights Date: 2026-03-18 | Code: A (Grant or award) Shares: +75.7646 | Price: $0.00 Shares Owned After: 450.8467 | Ownership: D (Direct) Footnotes: [F4] 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. [F4] 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. [F4] 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 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. F2: Includes 484 shares acquired under the Issuer's Employee Stock Purchase Plan on November 30, 2025. F3: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e). F4: 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: Ahmed Mohammed Shihab (2026-03-19)