Western Digital lawyer sells 1,483 company shares

Q: What did WDC insider Cynthia L. Tregillis report in this Form 4?

She reported selling 1,483 shares of Western Digital common stock in open-market transactions, 2,402 shares withheld to cover tax obligations on vesting awards, a grant of 3,878 restricted stock units, and conversions of Dividend Equivalent Rights into common shares.

Q: At what prices were WDC shares sold by Cynthia L. Tregillis?

She reported selling WDC common stock at $450.78 per share on August 26, 2026 for 476 shares and $478.36 per share on August 27, 2026 for 1,007 shares, both described as sales in open market or private transactions.

Q: How many Western Digital shares were withheld for tax obligations?

The Form 4 reports 2,402 shares of WDC common stock (771 shares on August 25, 2026 and 1,631 shares on August 26, 2026) disposed of under transaction code F as payment of tax obligations by withholding securities incident to vesting, under Rule 16b-3(e).

Q: What equity award did Cynthia L. Tregillis receive from WDC?

She received a grant of 3,878 restricted stock units of Western Digital on August 25, 2026. A footnote explains each restricted stock unit represents a contingent right to receive one share of the company’s common stock.

WESTERN DIGITAL CORP (WDC) reported insider equity activity by Chief Legal Officer & Corporate Secretary Cynthia L. Tregillis.

Filing Impact

(Very High)

Filing Sentiment

(Negative)

Form Type

Rhea-AI Filing Summary

WESTERN DIGITAL CORP (WDC) reported insider equity activity by Chief Legal Officer & Corporate Secretary Cynthia L. Tregillis. She sold 1,483 shares of common stock in open-market transactions on August 26–27, 2026 at prices of $450.78 and $478.36 per share, effected under a Rule 10b5-1 trading plan adopted March 6, 2026. In connection with vesting equity awards, 2,402 shares were withheld to satisfy tax obligations under Rule 16b-3(e), and 3,878 restricted stock units were granted, each representing a right to one share. Dividend Equivalent Rights tied to vested RSUs were also converted into an equivalent number of common shares, with a cash payment made only for a fractional right.

Insights

Analyzing...

Insider Trade Summary 10b5-1

Exercise and sale activity reported; no spread calculated

Exercise and Sale 9 txns

Insider Tregillis Cynthia L

Role Chief Legal Officer & Corp Sec

Sold 1,483 shs ($696K)

Approx. gross sale proceeds $696K

Type	Security	Shares	Price	Value
Sale	Common Stock ^F4	1,007	$478.36	$482K
Exercise	Dividend Equivalent Rights ^F1	9.4687	$0.00	$0.00
Sale	Common Stock ^F4	476	$450.78	$215K
Exercise	Common Stock ^F1	9	$0.00	$0.00
Tax Withholding	Common Stock ^F2	1,631	$468.88	$765K
Exercise	Dividend Equivalent Rights ^F1	7.7788	$0.00	$0.00
Exercise	Common Stock ^F1	7	$0.00	$0.00
Tax Withholding	Common Stock ^F2	771	$450.75	$348K
Grant/Award	Common Stock ^F3	3,878	$0.00	$0.00

Holdings After Transaction: Dividend Equivalent Rights — 277.5402 contracts (Direct); Common Stock — 112,155 shares (Direct)

Footnotes (4)

F1. 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.
F2. Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).
F3. 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.
F4. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 6, 2026.

Key Figures

Common stock sold: 1,483 shares Sale price per share: $450.78 Sale price per share: $478.36 +3 more

6 metrics

Common stock sold 1,483 shares Open-market or private sales on 2026-08-26 and 2026-08-27

Sale price per share $450.78 476 shares of common stock sold on 2026-08-26

Sale price per share $478.36 1,007 shares of common stock sold on 2026-08-27

Shares withheld for tax obligations 2,402 shares Code F dispositions on 2026-08-25 and 2026-08-26 under Rule 16b-3(e)

Restricted stock units granted 3,878 units Grant to the reporting person on 2026-08-25, each unit for one common share

Dividend Equivalent Rights exercised 17.2475 rights Converted into an equal number of common shares on 2026-08-25 and 2026-08-26

Key Terms

Rule 10b5-1 trading plan, Dividend Equivalent Rights, restricted stock units, Rule 16b-3(e), +1 more

5 terms

Rule 10b5-1 trading plan regulatory

"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

Dividend Equivalent Rights financial

"The dividend equivalent rights were converted into, and paid in the form of,"

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 financial

"in connection with the vesting of restricted stock units to which the dividend"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

Rule 16b-3(e) regulatory

"Payment of tax obligation by withholding securities incident to the vesting"

contingent right financial

"Each restricted stock unit represents a contingent right to receive one"

FAQ

What did WDC insider Cynthia L. Tregillis report in this Form 4?

She reported selling 1,483 shares of Western Digital common stock in open-market transactions, 2,402 shares withheld to cover tax obligations on vesting awards, a grant of 3,878 restricted stock units, and conversions of Dividend Equivalent Rights into common shares.

At what prices were WDC shares sold by Cynthia L. Tregillis?

She reported selling WDC common stock at $450.78 per share on August 26, 2026 for 476 shares and $478.36 per share on August 27, 2026 for 1,007 shares, both described as sales in open market or private transactions.

Were the WDC insider stock sales under a Rule 10b5-1 trading plan?

Yes. A footnote states that the sales reported were effected pursuant to a Rule 10b5-1 trading plan adopted by Cynthia L. Tregillis on March 6, 2026, and the filing affirms the Rule 10b5-1 checkbox.

How many Western Digital shares were withheld for tax obligations?

The Form 4 reports 2,402 shares of WDC common stock (771 shares on August 25, 2026 and 1,631 shares on August 26, 2026) disposed of under transaction code F as payment of tax obligations by withholding securities incident to vesting, under Rule 16b-3(e).

What equity award did Cynthia L. Tregillis receive from WDC?

She received a grant of 3,878 restricted stock units of Western Digital on August 25, 2026. A footnote explains each restricted stock unit represents a contingent right to receive one share of the company’s common stock.

What are the Dividend Equivalent Rights mentioned in the WDC Form 4?

Dividend Equivalent Rights related to restricted stock units were converted one-for-one into common shares upon vesting of the RSUs. The filing notes that a cash amount was also paid to settle a fractional Dividend Equivalent Right.

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

Form 4 Insider Transactions: What Each Field Means →

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google

Available on EDGAR 08/28/2026 - 09:00 AM Accepted by SEC EDGAR 08/27/2026 - 08:05 PM

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)
08/25/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	08/25/2026		M		7⁽¹⁾	A	$0.0	112,153	D
Common Stock	08/25/2026		F		771⁽²⁾	D	$450.75	111,382	D
Common Stock⁽³⁾	08/25/2026		A		3,878	A	$0.0	115,260	D
Common Stock	08/26/2026		S⁽⁴⁾		476	D	$450.78	114,784	D
Common Stock	08/26/2026		M		9⁽¹⁾	A	$0.0	114,793	D
Common Stock	08/26/2026		F		1,631⁽²⁾	D	$468.88	113,162	D
Common Stock	08/27/2026		S⁽⁴⁾		1,007	D	$478.36	112,155	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Dividend Equivalent Rights	⁽¹⁾	08/25/2026		M			7.7788	⁽¹⁾	⁽¹⁾	Common Stock	7.7788	$0.0	287.0089	D
Dividend Equivalent Rights	⁽¹⁾	08/26/2026		M			9.4687	⁽¹⁾	⁽¹⁾	Common Stock	9.4687	$0.0	277.5402	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).

3. 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.

4. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 6, 2026.

	By: /s/ Sandra Garcia Attorney-in-Fact For: Cynthia Tregillis	08/27/2026
	** 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)

Source: View Original Filing on SEC EDGAR