Gene M. Zamiska - 21 Aug 2025 Form 4 Insider Report for WESTERN DIGITAL CORP (WDC)

Role
SVP, Global Accounting & Chief
Signature
By: /s/ Sandra Garcia Attorney-in-Fact For: Gene Zamiska
Issuer symbol
WDC
Transactions as of
21 Aug 2025
Net transactions value
-$510,011
Form type
4
Filing time
25 Aug 2025, 18:47:10 UTC
Previous filing
21 Aug 2025
Next filing
27 Aug 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Zamiska Gene M. SVP, Global Accounting & Chief C/O WESTERN DIGITAL CORPORATION, 5601 GREAT OAKS PARKWAY, SAN JOSE By: /s/ Sandra Garcia Attorney-in-Fact For: Gene Zamiska 25 Aug 2025 0001456385

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction WDC Common Stock Options Exercise $0 +6 +0.02% $0.000000 36,517 21 Aug 2025 Direct F1
transaction WDC Common Stock Tax liability $134,164 -1,797 -4.9% $74.66 34,720 21 Aug 2025 Direct F2
transaction WDC Common Stock Sale $239,149 -3,160 -9.1% $75.68 31,560 21 Aug 2025 Direct F3
transaction WDC Common Stock Sale $136,698 -1,828 -5.8% $74.78 29,732 22 Aug 2025 Direct F3

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 -6 -11% $0.000000 50 21 Aug 2025 Common Stock 6 Direct F1
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Buy Plan / Sale Plan: These are also open market purchases/sales of shares, but in this case the transaction is part of a trading plan. Rule 10b5-1 allows insiders to setup a trading plan to buy/sell stocks over a certain period of time. Since the purchases/sales are predetermined, this protects the insiders from violating insider trading law.

Transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

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).
F3 The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 6, 2025.