Cynthia Tregillis - 20 Oct 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 Oct 2025
Transactions value $
-$158,840
Form type
4
Filing time
21 Oct 2025, 18:36:42 UTC
Previous filing
22 Sep 2025
Next filing
24 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 21 Oct 2025 0002057088

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction WDC Common Stock Options Exercise $0 +8 +0.01% $0.00 151K 20 Oct 2025 Direct F1
transaction WDC Common Stock Tax liability -$159K -1.31K -0.87% $121.53 150K 20 Oct 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 -8.76 -2.92% $0.00 291 20 Oct 2025 Common Stock 8.76 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).