Cynthia L. Tregillis - 20 Nov 2025 Form 4 Insider Report for WESTERN DIGITAL CORP (WDC)

Role
Chief Legal Officer & Corp Sec
Signature
By: /s/ Sandra Garcia Attorney-in-Fact For: Cynthia Tregillis
Issuer symbol
WDC
Transactions as of
20 Nov 2025
Net transactions value
-$207,370
Form type
4
Filing time
24 Nov 2025, 17:45:54 UTC
Previous filing
21 Oct 2025
Next filing
26 Nov 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Tregillis Cynthia L Chief Legal Officer & Corp Sec C/O WESTERN DIGITAL CORPORATION, 5601 GREAT OAKS PARKWAY, SAN JOSE By: /s/ Sandra Garcia Attorney-in-Fact For: Cynthia Tregillis 24 Nov 2025 0002057088

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction WDC Common Stock Options Exercise $0 +2 +0% $0.000000 149,577 20 Nov 2025 Direct F1
transaction WDC Common Stock Tax liability $53,147 -379 -0.25% $140.23 149,198 20 Nov 2025 Direct F2
transaction WDC Common Stock Options Exercise $0 +7 +0% $0.000000 149,205 21 Nov 2025 Direct F1
transaction WDC Common Stock Tax liability $154,223 -1,108 -0.74% $139.19 148,097 21 Nov 2025 Direct F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction WDC Dividend Equivalent Rights Options Exercise $0 -3 -0.87% $0.000000 289 20 Nov 2025 Common Stock 3 Direct F1
transaction WDC Dividend Equivalent Rights Options Exercise $0 -7 -2.6% $0.000000 281 21 Nov 2025 Common Stock 7 Direct F1
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
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).