[Form 4] Western Digital Corp. Insider Trading Activity

Rhea-AI Filing Summary

Gene M. Zamiska, Senior Vice President and Principal Accounting Officer of Western Digital Corporation (WDC), reported insider transactions on 08/20/2025. Dividend equivalent rights converted into 10.5643 shares resulting from vesting of restricted stock units, increasing direct common stock holdings to 39,613 shares. Separately, 3,102 shares were withheld to cover tax obligations and disposed of at $75.64 per share, leaving 36,511 shares beneficially owned after the transactions. The Form 4 was signed on behalf of Mr. Zamiska by an attorney-in-fact on 08/21/2025.

Insights

Financial Analyst

TL;DR Insider received shares from vested RSUs and had a small tax-withholding sale, leaving ~36.5k shares held.

This filing documents routine equity compensation activity: dividend equivalent rights were converted to 10.5643 shares and paid in stock upon RSU vesting, and 3,102 shares were withheld and disposed of to satisfy tax withholding at $75.64 per share. The net effect is a modest increase from the conversion but a net decrease to 36,511 shares beneficially owned. These transactions are standard for executive compensation and do not, by themselves, indicate a change in corporate fundamentals.

Corporate Governance Expert

TL;DR Transactions reflect customary settlement and tax withholding of vested equity awards.

The Form 4 clearly describes settlement mechanics: dividend equivalents converting one-for-one into common stock and tax withholding via share disposition consistent with Rule 16b-3(e). The filing is complete with signature by an attorney-in-fact. No departures from standard governance or disclosure practices are evident in the document.

Insider Trade Summary

10.564 shares exercised/converted

Mixed 3 txns

Insider Zamiska Gene M.

Role SVP & Princ. Acctg Officer

Type	Security	Shares	Price	Value
Exercise	Dividend Equivalent Rights	10.564	$0.00	--
Exercise	Common Stock	9	$0.00	--
Tax Withholding	Common Stock	3,102	$75.64	$235K

Holdings After Transaction: Dividend Equivalent Rights — 56.377 shares (Direct); Common Stock — 39,613 shares (Direct)

Footnotes (1)

1. 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. Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a 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). See Instruction 10.

1. Name and Address of Reporting Person^*

Zamiska Gene M.

(Last) (First) (Middle)

C/O WESTERN DIGITAL CORPORATION

5601 GREAT OAKS PARKWAY

(Street)

SAN JOSE CA 95119

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
WESTERN DIGITAL CORP [ WDC ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	SVP & Princ. Acctg Officer

3. Date of Earliest Transaction (Month/Day/Year)
08/20/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	08/20/2025		M		9(1)	A	$0.0	39,613	D
Common Stock	08/20/2025		F		3,102(2)	D	$75.64	36,511	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Dividend Equivalent Rights	(1)	08/20/2025		M			10.5643	(1)	(1)	Common Stock	10.5643	$0.0	56.3767	D

Explanation of Responses:

1. 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.

2. Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

	By: /s/ Sandra Garcia Attorney-in-Fact For: Gene Zamiska	08/21/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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