Irving Tan - 18 Dec 2025 Form 4 Insider Report for WESTERN DIGITAL CORP (WDC)

Role: Chief Executive Officer, Director
Signature: By: /s/ Sandra Garcia Attorney-in-Fact For: Irving Tan
Issuer symbol: WDC
Transactions as of: 18 Dec 2025
Net transactions value: -$175,104
Form type: 4
Filing time: 22 Dec 2025, 16:51:49 UTC
Previous filing: 26 Nov 2025
Next filing: 04 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Tan Irving	Chief Executive Officer, Director	C/O WESTERN DIGITAL CORPORATION, 5601 GREAT OAKS PARKWAY, SAN JOSE	By: /s/ Sandra Garcia Attorney-in-Fact For: Irving Tan	22 Dec 2025	0001729518

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	WDC	Common Stock	Options Exercise	$0	+43	+0.01%	$0.000000	644,553	20 Dec 2025	Direct	F1
transaction	WDC	Common Stock	Tax liability	$175,104	-967	-0.15%	$181.08	643,586	20 Dec 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	Award	$0	+255	+31%	$0.000000	1,072	18 Dec 2025	Common Stock	255		Direct	F3
transaction	WDC	Dividend Equivalent Rights	Options Exercise	$0	-44	-4.1%	$0.000000	1,028	20 Dec 2025	Common Stock	44		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).
F3	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.