WESTERN DIGITAL CORP — Director's Dealing 2025

Aug 29, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WESTERN DIGITAL CORP (WDC)
CIK: 0000106040
Period of Report: 2025-08-26

Reporting Person: Tregillis Cynthia L (Chief Legal Officer & Corp Sec)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-08-26	Common Stock	A	16554	$0.0	Acquired	151139	Direct
2025-08-27	Common Stock	M	1	$0.0	Acquired	151140	Direct
2025-08-27	Common Stock	F	266	$80.67	Disposed	150874	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-08-27	Dividend Equivalent Rights	$	M	1.1421	Disposed		Common Stock (1.1421)	Direct

Footnotes

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.

F2: 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.

F3: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).