MATTHEW E. MASSENGILL - 18 Dec 2025 Form 4 Insider Report for WESTERN DIGITAL CORP (WDC)

Role
Director
Signature
By: /s/ Sandra Garcia Attorney-in-Fact For: Matthew E. Massengill
Issuer symbol
WDC
Transactions as of
18 Dec 2025
Net transactions value
$0
Form type
4
Filing time
22 Dec 2025, 16:51:08 UTC
Previous filing
21 Nov 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
MASSENGILL MATTHEW E Director C/O WESTERN DIGITAL CORPORATION, 5601 GREAT OAKS PARKWAY, SAN JOSE By: /s/ Sandra Garcia Attorney-in-Fact For: Matthew E. Massengill 22 Dec 2025 0001232826

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 Award $0 +21 +29% $0.000000 93 18 Dec 2025 Common Stock 21 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 accrued on previously awarded restricted stock units (RSUs) which vest proportionately with the RSUs to which they relate. Each dividend equivalent right represents a contingent right to receive one share of the Issuer's common stock or the cash value thereof.