X0609 4 2026-08-25 0 0000106040 WESTERN DIGITAL CORP WDC 0001729518 Tan Irving false C/O WESTERN DIGITAL CORPORATION 5601 GREAT OAKS PARKWAY SAN JOSE CA 95119 1 1 0 0 Chief Executive Officer 0 Common Stock 2026-08-25 4 M 0 32 0.0 A 366347 D Common Stock 2026-08-25 4 F 0 476 450.75 D 365871 D Common Stock 2026-08-25 4 A 0 16548 0.0 A 382419 D Common Stock 2026-08-26 4 M 0 42 0.0 A 382461 D Common Stock 2026-08-26 4 F 0 3314 468.88 D 379147 D Common Stock 209000 I by Personal Inv. Co. Dividend Equivalent Rights 2026-08-25 4 M 0 32.0313 0.0 D Common Stock 32.0313 816.3542 D Dividend Equivalent Rights 2026-08-26 4 M 0 42.4157 0.0 D Common Stock 42.4157 773.9385 D 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. Since the date of the Reporting Person's last Form 4, the Reporting Person transferred 209,000 shares of the Issuer's common stock to the Reporting Person's personal investment company, organized under the laws of the Bahamas, of which the Reporting Person is the sole shareholder. The transfer constituted a change in form of beneficial ownership exempt from Section 16 pursuant to Rule 16a-13 under the Securities Exchange Act of 1934, as amended. Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e). 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. By: /s/ Sandra Garcia Attorney-in-Fact For: Irving Tan 2026-08-27