[Form 4] WESTERN DIGITAL CORP Insider Trading Activity

Rhea-AI Filing Summary

Western Digital Corp. (WDC) director Stephanie A. Streeter reported changes in her holdings of the company’s stock. On 11/20/2025, she received 1,585 shares of common stock through a grant of restricted stock units, at a stated price of $0.0 per share, held directly.

On 11/19/2025, dividend equivalent rights tied to her restricted stock units were converted into and paid in the form of common stock. This included 16 shares shown in Table I and 16.8276 dividend equivalent rights in Table II, which were settled in stock with a small cash payment for the fractional right. Following these transactions, she beneficially owned 40,407 shares indirectly through a Family Trust.

The filing notes that this indirect total also reflects Streeter’s contribution of personally held shares to the Family Trust, vesting of restricted stock units whose underlying shares were issued to the trust, and 1,984 additional stock units credited to her in connection with Western Digital’s spin-off of a former wholly owned subsidiary on February 21, 2025, based on an equity conversion ratio of 1.452526 stock units for every existing Issuer stock unit.

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^*

STREETER STEPHANIE A

(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)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
11/19/2025

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(1)	11/20/2025		A		1,585	A	$0.0	1,585	D
Common Stock	11/19/2025		M		16(2)	A	$0.0	40,407(3)	I	By Family Trust

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	(2)	11/19/2025		M			16.8276	(2)	(2)	Common Stock	16.8276	$0.0	0	D

Explanation of Responses:

1. Represents the grant of restricted stock units to the Reporting Person. Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock.

2. 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.

3. Includes change in form of beneficial ownership of shares of Issuer's common stock in connection with the Reporting Person's contribution of shares owned outright to the Reporting Person's Family Trust Account and the vesting of the Reporting Person's restricted stock unit award. With respect to the vested restricted stock unit award, the underlying shares were issued directly to the Reporting Person's Family Trust account. Additionally includes 1,984 additional stock units acquired by the Reporting Person in connection with the Issuer's spin-off (the "Spin-Off") of a then-wholly owned subsidiary of the Issuer on February 21, 2025. Pursuant to an Employee Matters Agreement, at the effective time of the Spin-Off, each outstanding Issuer stock unit was adjusted and converted into additional stock units based on the equity conversion ratio of 1.452526 per every Issuer stock unit.

	By: /s/ Sandra Garcia Attorney-in-Fact For: Stephanie A. Streeter	11/21/2025
	** 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.
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 Western Digital (WDC) director Stephanie Streeter report in this Form 4?

Director Stephanie A. Streeter reported equity transactions involving Western Digital common stock and related awards. She received 1,585 shares of common stock on 11/20/2025 from a grant of restricted stock units, and dividend equivalent rights tied to her restricted stock units were converted into common stock on 11/19/2025. Her total indirect holdings after these transactions were 40,407 shares through a Family Trust.

How many Western Digital shares did Stephanie Streeter acquire in this filing?

The filing shows an acquisition of 1,585 shares of Western Digital common stock on 11/20/2025 through a restricted stock unit grant. It also reflects the conversion of dividend equivalent rights into additional common shares on 11/19/2025, including 16 shares listed in Table I and 16.8276 dividend equivalent rights listed in Table II that were settled in stock plus cash for the fractional portion.

What is the significance of the dividend equivalent rights in the WDC Form 4?

Dividend equivalent rights are credits that mirror dividends on unvested stock units. In this case, the rights were converted into Western Digital common stock on a one-for-one basis when the underlying restricted stock units vested. The filing states that the dividend equivalent rights were paid in stock with a cash amount used to settle a fractional right, and after the conversion, the number of dividend equivalent rights reported as beneficially owned was 0.

Why does Stephanie Streeter’s Family Trust hold Western Digital (WDC) shares?

The Form 4 notes that the 40,407 shares indirectly owned through the Family Trust reflect several changes in beneficial ownership. These include Streeter’s contribution of shares previously owned outright into the Family Trust account and the issuance of shares from vested restricted stock units directly to that account. As a result, her ownership is now reported as indirect through the Family Trust rather than solely in her personal name.

How did Western Digital’s February 21, 2025 spin-off affect Stephanie Streeter’s stock units?

The filing explains that Streeter received 1,984 additional stock units in connection with Western Digital’s spin-off of a then-wholly owned subsidiary on February 21, 2025. Under an Employee Matters Agreement, each outstanding Issuer stock unit was adjusted and converted into additional stock units using an equity conversion ratio of 1.452526 for every existing Issuer stock unit. These additional units are included in the reported total of shares and units beneficially owned.

What is Stephanie Streeter’s role and filing status with Western Digital (WDC)?

The reporting person, Stephanie A. Streeter, is identified in the Form 4 as a Director of Western Digital Corp. The form is marked as filed by one reporting person, indicating she is the sole insider covered by this specific report. The signature block shows the form was signed on her behalf by Sandra Garcia as Attorney-in-Fact on 11/21/2025.