WDC Form 144: 432 Restricted Shares Proposed Sale

Western Digital (WDC) submission reports proposed sale of 432 shares of Common Stock (Restricted Stock) with an execution date of 06/03/2026.

Rhea-AI Filing Summary

Western Digital (WDC) submission reports proposed sale of 432 shares of Common Stock (Restricted Stock) with an execution date of 06/03/2026. The filing lists four prior dispositions by Cynthia Lock Tregillis totaling specific share counts and dollar amounts during April–May 2026.

Insights

Securities Compliance Analyst

Form 144 notifies a planned sale of restricted common shares by an affiliate.

The filing lists 432 shares of Restricted Stock to be sold on 06/03/2026 and shows recent dispositions by the same individual in 04/2026–05/2026. This is a regulatory notice for intended resale under Section 144.

Cash‑flow treatment and broker/method details are not provided in the excerpt; subsequent transaction confirmations would appear in trade reports.

Key Figures

Proposed sale: 432 shares Disposition 1: 363 shares Disposition 2: 106 shares +2 more

5 metrics

Proposed sale 432 shares Restricted Stock, 06/03/2026

Disposition 1 363 shares 04/21/2026, $136,883.67

Disposition 2 106 shares 05/21/2026, $48,640.22

Disposition 3 308 shares 05/22/2026, $150,491.88

Disposition 4 214 shares 05/27/2026, $115,480.82

Key Terms

Form 144, Restricted Stock, Issuer

3 terms

Form 144 regulatory

"144: Securities To Be Sold"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

Restricted Stock financial

"Common | 06/03/2026 | Restricted Stock"

Shares granted to an individual that carry limits on transfer or sale until certain conditions are met, such as staying with the company for a set time or hitting performance targets. Think of them as a locked gift that gradually opens; for investors they matter because they affect how many shares may enter the market later, signal management incentives and potential dilution, and reveal confidence in future company performance.

Issuer regulatory

"Restricted Stock | ISSUER"

FAQ

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

What does WDC's Form 144 filed for 06/03/2026 report?

It reports a proposed sale of 432 shares of Restricted Common Stock on 06/03/2026. The filing identifies the shares as Restricted Stock and lists recent related dispositions by Cynthia Lock Tregillis in April–May 2026 with share counts and dollar amounts.

Who is the reporting person on the WDC Form 144 and what recent sales are listed?

The reporting person named is Cynthia Lock Tregillis. The excerpt lists four prior dispositions: 363, 106, 308, and 214 shares on dates in April–May 2026 with corresponding dollar amounts shown for each trade.

Does the Form 144 excerpt state how proceeds are handled or who will receive them?

The excerpt does not state proceeds treatment. The provided text lists the security type, share counts, dates, and dollar amounts for prior dispositions but does not specify whether proceeds go to the issuer or selling holder.

What security type is being sold according to the WDC Form 144 excerpt?

The security is identified as Restricted Stock of Common Stock. The filing rows show the instrument labeled “Restricted Stock” with the intended sale date of 06/03/2026 and a quantity of 432 shares.

Are the prior sale amounts listed in the Form 144 excerpt aggregated?

The excerpt provides per‑transaction share counts and dollar figures but does not present an aggregate total. It lists four separate dispositions with specific dates, share counts, and dollar amounts rather than a summed aggregate.

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

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Accepted by SEC EDGAR 06/05/2026 - 04:07 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0002057088
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	WESTERN DIGITAL CORPORATION
SEC File Number	001-08703
Address of Issuer	5601 Great Oaks Parkway San Jose CALIFORNIA 95119
Phone	(408) 717-6000
Name of Person for Whose Account the Securities are To Be Sold	CYNTHIA LOCK TREGILLIS
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	432	235699.20	344682131	06/05/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	06/03/2026	Restricted Stock	ISSUER			432	06/03/2026	Not Applicable

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
CYNTHIA LOCK TREGILLIS 5601 Great Oaks Parkway San Jose CA 95119	Common	05/27/2026	214	115480.82
CYNTHIA LOCK TREGILLIS 5601 Great Oaks Parkway San Jose CA 95119	Common	05/22/2026	308	150491.88
CYNTHIA LOCK TREGILLIS 5601 Great Oaks Parkway San Jose CA 95119	Common	05/21/2026	106	48640.22
CYNTHIA LOCK TREGILLIS 5601 Great Oaks Parkway San Jose CA 95119	Common	04/21/2026	363	136883.67

144: Remarks and Signature

Remarks
Date of Notice	06/05/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	03/06/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Cynthia Lock Tregillis
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)