[Form 4] WESTERN DIGITAL CORP Insider Trading Activity

Rhea-AI Filing Summary

Vidyadhara K. Gubbi, Chief of Global Operations at Western Digital (WDC), reported acquisition of dividend equivalent rights tied to previously awarded restricted stock units (RSUs). The Form 4 shows on 09/18/2025 an acquisition of 103.087 dividend equivalent rights, each representing a contingent claim to one share or cash value, recorded at $0.00. After the transaction the reporting person beneficially owns 257.9881 shares directly. The filing explains these rights vest proportionately with the underlying RSUs.

Positive

• Increased direct ownership: Reporting person’s direct beneficial ownership rose to 257.9881 shares, reflecting accrued compensation converting to share-equivalent rights.

Negative

• None.

Insights

Corporate Governance Expert

TL;DR: Officer acquired dividend equivalent rights that increase direct ownership modestly; transaction is routine and tied to existing RSUs.

The reported transaction is an internal compensation-related accrual rather than an open-market purchase or sale. The filing records 103.087 dividend equivalent rights that vest with previously granted RSUs and are valued at $0.00 in the Form 4, consistent with compensation mechanics converting accrued dividends into share-equivalent units. Because these rights vest proportionately with RSUs, the change reflects scheduled compensation vesting, not a strategic trade. The increase to 257.9881 shares of direct beneficial ownership is small in absolute terms and appears administrative rather than indicative of a change in insider sentiment.

Securities Analyst

TL;DR: Transaction is non-market, compensation-driven and has limited immediate market impact.

The Form 4 discloses a non-derivative acquisition of dividend equivalent rights on 09/18/2025 amounting to 103.087 units, priced at $0.0 and resulting in 257.9881 directly held shares. The instrument is described as contingent rights to receive common stock or cash value upon vesting alongside underlying RSUs. From a securities perspective this is a routine insider reporting of compensation vesting; it does not signal a purchase or sale decision and is unlikely to materially affect valuation or float.

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

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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^*

Gubbi Vidyadhara K

(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)
	Chief of Global Operations

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		103.087		(1)	(1)	Common Stock	103.087	$0.0	257.9881	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: Vidyadhara K. Gubbi	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 did WDC insider Vidyadhara K. Gubbi report on Form 4?

The Form 4 reports an acquisition on 09/18/2025 of 103.087 dividend equivalent rights tied to previously awarded RSUs.

How many shares does the reporting person own after the transaction?

After the reported transaction the reporting person beneficially owns 257.9881 shares directly.

Were these market purchases or compensation-related units?

They are compensation-related dividend equivalent rights that vest proportionately with underlying RSUs, not open-market trades.

What price was reported for the acquired rights?

The Form 4 shows a reported price of $0.0, indicating these were accrued dividend equivalents rather than a cash purchase.

When was the Form 4 signed and filed by the reporting representative?

The signature block shows the filing was signed by an attorney-in-fact on 09/22/2025.