Western Digital (WDC)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-08-25 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: WESTERN DIGITAL CORP (WDC) CIK: 0000106040 --- Reporting Owner --- Name: Gubbi Vidyadhara K CIK: 0002057093 Role: Officer (Chief of Global Operations) --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-08-25 | Code: M (Exercise of derivative) Shares: +9 | Price: $0.00 Shares Owned After: 82,135 | 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. [Transaction #2] Security: Common Stock Date: 2026-08-25 | Code: F (Payment of exercise/tax) Shares: -1,143 | Price: $450.75 Total Value: $515,207.25 Shares Owned After: 80,992 | Ownership: D (Direct) Footnotes: [F2] Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e). [Transaction #3] Security: Common Stock Date: 2026-08-25 | Code: A (Grant or award) Shares: +5,171 | Price: $0.00 Shares Owned After: 86,163 | Ownership: D (Direct) Footnotes: [F3] 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. [Transaction #4] Security: Common Stock Date: 2026-08-26 | Code: M (Exercise of derivative) Shares: +9 | Price: $0.00 Shares Owned After: 86,172 | 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. [Transaction #5] Security: Common Stock Date: 2026-08-26 | Code: F (Payment of exercise/tax) Shares: -2,056 | Price: $468.88 Total Value: $964,017.28 Shares Owned After: 84,116 | Ownership: D (Direct) Footnotes: [F2] 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: 2026-08-25 | Code: M (Exercise of derivative) Shares: -9.1485 | Price: $0.00 Shares Owned After: 217.7097 | 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: 2026-08-26 | Code: M (Exercise of derivative) Shares: -9.4687 | Price: $0.00 Shares Owned After: 208.241 | 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. --- 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: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e). F3: 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. --- Signature --- /s/ By: /s/ Sandra Garcia Attorney-in-Fact For: Vidyadhara Gubbi (2026-08-27)