Western Digital CLO granted 27 dividend rights

Western Digital’s chief legal officer received additional dividend equivalent rights tied to existing restricted stock units, increasing her reported derivative holdings.

Rhea-AI Filing Summary

WESTERN DIGITAL CORP (symbol: WDC) is the issuer of record for a Form 4 filing submitted to the SEC. Tregillis Cynthia L reported acquisition or exercise transactions in this Form 4 filing.

WESTERN DIGITAL CORP (WDC) reported that Chief Legal Officer & Corp Sec Cynthia L. Tregillis received an award of 27.38 Dividend Equivalent Rights on September 17, 2026, linked to previously granted restricted stock units. Following this grant, she holds 297.8619 Dividend Equivalent Rights directly.

Each Dividend Equivalent Right represents a contingent right to receive one share of Western Digital common stock or its cash value, and will vest proportionately with the underlying restricted stock units. No Rule 10b5-1 trading plan is reported for this Form 4.

Insider Trade Summary

Grant/Award: 27.38 shares

Grant/Award 1 txn

Insider Tregillis Cynthia L

Role Chief Legal Officer & Corp Sec

Type	Security	Shares	Price	Value
Grant/Award	Dividend Equivalent Rights F1	27.38	$0.00	$0.00

Holdings After Transaction: Dividend Equivalent Rights — 297.8619 contracts (Direct)

Footnotes (1)

1. F1. 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.

Key Figures

Dividend Equivalent Rights granted: 27.38 rights Dividend Equivalent Rights after transaction: 297.8619 rights Transaction price per right: $0.00 per right

3 metrics

Dividend Equivalent Rights granted 27.38 rights Grant to Cynthia L. Tregillis on September 17, 2026

Dividend Equivalent Rights after transaction 297.8619 rights Total direct holdings of Dividend Equivalent Rights after the grant

Transaction price per right $0.00 per right Reported grant price for Dividend Equivalent Rights

Key Terms

Dividend Equivalent Rights, restricted stock units (RSUs), contingent right

3 terms

Dividend Equivalent Rights financial

"The dividend equivalent rights accrued on previously awarded restricted stock units"

Dividend equivalent rights are promises that mirror the cash payments shareholders get from a company’s profits, but they are paid to holders of certain awards (like stock options or restricted stock units) rather than to actual shares. Think of them as a paycheck top‑up that matches dividends while the award is not yet a real stock, and they matter to investors because they add to employee compensation costs and potential share dilution, affecting company profitability and per‑share value.

restricted stock units (RSUs) financial

"accrued on previously awarded restricted stock units (RSUs) which vest proportionately"

Restricted stock units (RSUs) are a type of company promise to give employees shares of stock in the future, usually after certain conditions like working for a set time. They are like a gift promised today that you receive later, which can become valuable if the company's stock price goes up. RSUs matter because they are a way companies reward employees and can be a significant part of compensation.

contingent right financial

"Each dividend equivalent right represents a contingent right to receive one share"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did WDC disclose for Cynthia L. Tregillis?

On September 17, 2026, Cynthia L. Tregillis received an award of 27.38 Dividend Equivalent Rights tied to previously granted restricted stock units, reported as a derivative grant with no cash price per right.

How many Dividend Equivalent Rights does the WDC officer hold after this grant?

After the September 17, 2026 grant, Cynthia L. Tregillis holds 297.8619 Dividend Equivalent Rights directly, as reported in the Form 4 filing.

What do the Dividend Equivalent Rights at Western Digital (WDC) represent?

Each Dividend Equivalent Right represents a contingent right to receive either one share of Western Digital common stock or the cash value of that share, and they vest proportionately with the related restricted stock units.

Are the WDC Dividend Equivalent Rights tied to vesting of RSUs?

Yes. The filing states that the Dividend Equivalent Rights accrued on previously awarded restricted stock units (RSUs) and will vest proportionately with the RSUs to which they relate.

Was the WDC insider transaction made under a Rule 10b5-1 plan?

No. The Form 4 indicates the Rule 10b5-1 checkbox is not affirmed, so no Rule 10b5-1 trading plan is reported in connection with this grant of Dividend Equivalent Rights.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/21/2026 - 06:37 PM Accepted by SEC EDGAR 09/21/2026 - 06:36 PM Learn about SEC filing dates

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^*

Tregillis Cynthia L

(Last) (First) (Middle)

C/O WESTERN DIGITAL CORPORATION

5601 GREAT OAKS PARKWAY

(Street)

SAN JOSE CALIFORNIA 95119

(City) (State) (Zip)

UNITED STATES

(Country)

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 Legal Officer & Corp Sec

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/17/2026

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

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

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

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)	09/17/2026		A		27.38		(1)	(1)	Common Stock	27.38	$0.0	297.8619	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: Cynthia Tregillis	09/21/2026
	** 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.
* Form 4: SEC 1474 (03-26)