[Form 4] WESTERN DIGITAL CORP Insider Trading Activity

Rhea-AI Filing Summary

Western Digital Corp (WDC) Chief Financial Officer Kris Sennesael reported routine equity compensation activity. On 11/20/2025, 99 shares of common stock were acquired at $0.0 in connection with the conversion of dividend equivalent rights tied to vested restricted stock units. To cover tax obligations on the vesting, 18,680 shares were withheld at a price of $140.23 per share.

After these transactions, Sennesael directly owned 187,966 shares of Western Digital common stock. He also held 387.6468 dividend equivalent rights as derivative securities, which can convert into additional common shares in connection with future vesting events.

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^*

Sennesael Kris

(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 Financial Officer

3. Date of Earliest Transaction (Month/Day/Year)
11/20/2025

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	11/20/2025		M		99(1)	A	$0.0	206,646	D
Common Stock	11/20/2025		F		18,680(2)	D	$140.23	187,966	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)	11/20/2025		M			99.285	(1)	(1)	Common Stock	0	$0.0	387.6468	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: Kris Sennesael	11/24/2025
	** 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 insider transaction did Western Digital (WDC) report in this Form 4?

The filing reports CFO Kris Sennesael acquiring 99 Western Digital common shares through conversion of dividend equivalent rights and the withholding of 18,680 shares to satisfy tax obligations related to vesting equity awards.

Who is the reporting person in Western Digital (WDC)'s latest Form 4?

The reporting person is Kris Sennesael, who serves as Western Digital’s Chief Financial Officer and is an officer of the company.

How many Western Digital (WDC) shares does the CFO own after this transaction?

Following the reported transactions on 11/20/2025, CFO Kris Sennesael directly owned 187,966 shares of Western Digital common stock.

What was the purpose of the 18,680 Western Digital (WDC) shares withheld?

The 18,680 shares of Western Digital common stock were withheld at $140.23 per share to pay tax obligations arising from the vesting of equity awards, as permitted under Rule 16b-3(e).

What are dividend equivalent rights mentioned in the Western Digital (WDC) Form 4?

The filing explains that the dividend equivalent rights convert into, and are paid in the form of, Western Digital common shares on a one-for-one basis when the related restricted stock units vest, with any fractional amount settled in cash.

How many derivative securities does the Western Digital (WDC) CFO hold after the transaction?

After the reported activity, Kris Sennesael held 387.6468 dividend equivalent rights as derivative securities related to Western Digital common stock.