STEPHANIE A. STREETER - 19 Nov 2025 Form 4 Insider Report for WESTERN DIGITAL CORP (WDC)

Role: Director
Signature: By: /s/ Sandra Garcia Attorney-in-Fact For: Stephanie A. Streeter
Issuer symbol: WDC
Transactions as of: 19 Nov 2025
Net transactions value: $0
Form type: 4
Filing time: 21 Nov 2025, 17:57:04 UTC
Previous filing: 22 Sep 2025
Next filing: 22 Dec 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
STREETER STEPHANIE A	Director	C/O WESTERN DIGITAL CORPORATION, 5601 GREAT OAKS PARKWAY, SAN JOSE	By: /s/ Sandra Garcia Attorney-in-Fact For: Stephanie A. Streeter	21 Nov 2025	0001021762

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	WDC	Common Stock	Award	$0	+1,585		$0.000000	1,585	20 Nov 2025	Direct	F1
transaction	WDC	Common Stock	Options Exercise	$0	+16	+0.04%	$0.000000	40,407	19 Nov 2025	By Family Trust	F2, 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	-17	-100%	$0.000000	0	19 Nov 2025	Common Stock	17		Direct	F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Represents the grant of restricted stock units to the Reporting Person. Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock.
F2	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.
F3	Includes change in form of beneficial ownership of shares of Issuer's common stock in connection with the Reporting Person's contribution of shares owned outright to the Reporting Person's Family Trust Account and the vesting of the Reporting Person's restricted stock unit award. With respect to the vested restricted stock unit award, the underlying shares were issued directly to the Reporting Person's Family Trust account. Additionally includes 1,984 additional stock units acquired by the Reporting Person in connection with the Issuer's spin-off (the "Spin-Off") of a then-wholly owned subsidiary of the Issuer on February 21, 2025. Pursuant to an Employee Matters Agreement, at the effective time of the Spin-Off, each outstanding Issuer stock unit was adjusted and converted into additional stock units based on the equity conversion ratio of 1.452526 per every Issuer stock unit.