WESTERN DIGITAL CORP — Director's Dealing 2026

Feb 24, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WESTERN DIGITAL CORP (WDC)
CIK: 0000106040
Period of Report: 2026-02-20

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-02-20	Common Stock	M	3	$0.0	Acquired	136541	Direct
2026-02-20	Common Stock	F	244	$285.52	Disposed	136297	Direct
2026-02-21	Common Stock	M	9	$0.0	Acquired	136306	Direct
2026-02-21	Common Stock	F	1109	$285.52	Disposed	135197	Direct
2026-02-23	Common Stock	S	130	$283.83	Disposed	135067	Direct
2026-02-24	Common Stock	S	308	$281.7	Disposed	134759	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2026-02-20	Dividend Equivalent Rights	$	M	3.234	Disposed		Common Stock (3.234)	Direct
2026-02-21	Dividend Equivalent Rights	$	M	9.4399	Disposed		Common Stock (9.4399)	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: Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

F3: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 23, 2025.