Tregillis Cynthia L 4

4 · WESTERN DIGITAL CORP · Filed Mar 5, 2026

Form 4

Period: 2026-03-03

Chief Legal Officer & Corp Sec

Transactions

Exercise/Conversion
Common Stock
[F1]
2026-03-03+23→ 133,804 total
Tax Payment
Common Stock
[F2]
2026-03-03$250.61/sh−2,798$701,207→ 131,006 total
Sale
Common Stock
[F3]
2026-03-04$257.91/sh−777$200,396→ 130,229 total
Sale
Common Stock
[F4]
2026-03-04$269.22/sh−8,547$2,300,986→ 121,682 total
Exercise/Conversion
Dividend Equivalent Rights
[F1]
2026-03-03−23.813→ 304.413 total
→ Common Stock (23.813 underlying)

Footnotes (4)

[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.
[F4]Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $269.17 to a high of $269.2201. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

Signature

By: /s/ Sandra Garcia Attorney-in-Fact For: Cynthia Tregillis|2026-03-05

Documents

1 file