[Form 4] WESTERN DIGITAL CORP Insider Trading Activity

Rhea-AI Filing Summary

Western Digital Corp (WDC) Form 4: Gene M. Zamiska, SVP & Principal Accounting Officer, reported a transaction dated 09/18/2025 showing 26.1267 dividend equivalent rights related to previously awarded restricted stock units (RSUs). Each dividend equivalent right represents a contingent right to one share of common stock or cash value and vests proportionately with the related RSUs. The filing reports 72.4915 shares beneficially owned following the transaction, held directly. The Form 4 was signed by an attorney-in-fact on behalf of Mr. Zamiska on 09/22/2025.

Insights

Securities Analyst

TL;DR: Routine insider accrual of dividend equivalent rights on RSUs; small incremental increase in beneficial ownership, no cash purchase or sale.

This Form 4 records the conversion-accrual of 26.1267 dividend equivalent rights tied to existing RSUs rather than an open-market trade. The transaction code indicates acquisition via the issuer’s plan at a $0.0 price, consistent with dividend equivalent accounting. The post-transaction beneficial ownership of 72.4915 shares direct remains disclosed. For investors, this is a routine, nondisruptive equity compensation event without immediate cash flow impact or change to outstanding share count.

Corporate Governance Expert

TL;DR: Standard insider disclosure of dividend equivalent accrual on RSUs; governance disclosure appears complete and timely.

The filing identifies the reporting person as an officer (SVP & Principal Accounting Officer) and provides the nature of the rights: contingent entitlement to common stock or cash value that vests with RSUs. The Form 4 shows the transaction date (09/18/2025) and was signed by an attorney-in-fact on 09/22/2025, meeting typical SEC Section 16 disclosure protocols. No amendments or other related-party arrangements are referenced in the provided text.

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

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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)
09/18/2025

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

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)	09/18/2025		A		26.1267		(1)	(1)	Common Stock	26.1267	$0.0	72.4915	D

Explanation of Responses:

1. 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.

	By: /s/ Sandra Garcia Attorney-in-Fact For: Gene Zamiska	09/22/2025
	** 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.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What transaction did Gene M. Zamiska report on Form 4 for WDC?

The filing reports the accrual of 26.1267 dividend equivalent rights related to previously awarded RSUs, dated 09/18/2025.

How many shares does Gene Zamiska beneficially own after the reported transaction?

The Form 4 shows 72.4915 shares beneficially owned following the reported transaction, held directly.

Was there any cash paid or open-market purchase recorded in this Form 4?

No cash or market purchase is recorded; the price is listed as $0.0, reflecting accrual of dividend equivalent rights tied to RSUs.

When was the Form 4 signed and by whom?

The form was signed by /s/ Sandra Garcia, Attorney-in-Fact for Gene Zamiska on 09/22/2025.

What do the dividend equivalent rights represent in this filing?

The filing states each dividend equivalent right is a contingent right to receive one share of common stock or the cash value and vests proportionately with the related RSUs.