Tregillis Cynthia L 4

4 · WESTERN DIGITAL CORP · Filed Feb 24, 2026

Form 4

Period: 2026-02-20

Chief Legal Officer & Corp Sec

Transactions

Exercise/Conversion
Common Stock
[F1]
2026-02-20+3→ 136,541 total
Tax Payment
Common Stock
[F2]
2026-02-20$285.52/sh−244$69,667→ 136,297 total
Exercise/Conversion
Common Stock
[F1]
2026-02-21+9→ 136,306 total
Tax Payment
Common Stock
[F2]
2026-02-21$285.52/sh−1,109$316,642→ 135,197 total
Sale
Common Stock
[F3]
2026-02-23$283.83/sh−130$36,898→ 135,067 total
Sale
Common Stock
[F3]
2026-02-24$281.70/sh−308$86,764→ 134,759 total
Exercise/Conversion
Dividend Equivalent Rights
[F1]
2026-02-20−3.234→ 344.228 total
→ Common Stock (3.234 underlying)
Exercise/Conversion
Dividend Equivalent Rights
[F1]
2026-02-21−9.44→ 334.788 total
→ Common Stock (9.44 underlying)

Footnotes (3)

[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.

Signature

By: /s/ Sandra Garcia Attorney-in-Fact For: Cynthia Tregillis|2026-02-24

Documents

1 file