Form 144: 363 Restricted Shares Listed for Sale

Morgan Stanley Smith Barney LLC submitted a Form 144 reporting an intended sale of 363 shares of Common Stock (Restricted Stock) by an issuer-directed transaction dated 04/20/2026.

Rhea-AI Filing Summary

Morgan Stanley Smith Barney LLC submitted a Form 144 reporting an intended sale of 363 shares of Common Stock (Restricted Stock) by an issuer-directed transaction dated 04/20/2026. The filing also lists multiple recent dispositions by Cynthia Lock Tregillis, including 9,324 shares sold on 03/04/2026 for $2,501,381.80. The filings show individual trade dates and proceeds for those past sales; the transactions are reported as sales of company common stock.

Insights

Securities Lawyer

Form 144 reports issuer-directed restricted stock sale and several recent open-market dispositions.

The filing lists an intended sale of 363 shares of restricted common stock dated 04/20/2026 and multiple completed dispositions by Cynthia Lock Tregillis in February–March 2026 with reported proceeds. Form 144 is a notice required under Rule 144 for proposed sales by affiliates.

These disclosures are routine reporting of insider sales; cash‑flow treatment and any holding-period qualifications are not specified in the excerpt.

Key Figures

Intended sale: 363 shares Completed sale example: 9,324 shares Proceeds (largest listed): $2,501,381.80 +1 more

4 metrics

Intended sale 363 shares restricted stock to be sold dated 04/20/2026

Completed sale example 9,324 shares sold on 03/04/2026 by Cynthia Lock Tregillis

Proceeds (largest listed) $2,501,381.80 proceeds from 9,324-share sale on 03/04/2026

Other recent sale 6,780 shares sold on 02/06/2026 by Cynthia Lock Tregillis for $1,833,922.20

Key Terms

Restricted Stock, Form 144, Issuer

3 terms

Restricted Stock regulatory

"Common | 04/20/2026 | Restricted Stock | ISSUER"

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.

Form 144 regulatory

"Filer Information | 144: Filer Information"

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.

Issuer other

"Restricted Stock | ISSUER"

FAQ

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

What does WDC's Form 144 report about the 04/20/2026 transaction?

It reports an intended sale of 363 shares of restricted common stock dated 04/20/2026. The filing lists the security as Restricted Stock and identifies the broker and issuer-related details.

Who sold shares according to the Form 144 excerpt for WDC?

The excerpt shows multiple sales by Cynthia Lock Tregillis, including a 9,324-share sale on 03/04/2026. Names and trade dates are listed alongside share counts and proceeds.

How much proceeds were reported for the largest listed sale in the excerpt?

The largest listed proceeds in the excerpt are $2,501,381.80 for the 9,324-share sale on 03/04/2026. Each line pairs shares sold with the reported dollar proceeds.

Does Form 144 confirm the sales were completed for the April 20, 2026 entry?

The April 04/20/2026 line is an intended sale entry for 363 restricted shares; the excerpt labels it as the security to be sold rather than confirming settlement details.

What broker is identified in the filing excerpt for these transactions?

The filing lists Morgan Stanley Smith Barney LLC with an address at 1 New York Plaza, indicating the broker-dealer handling the reported sale notices in the excerpt.

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

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Accepted by SEC EDGAR 04/21/2026 - 04:03 PM EDT 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	363	136883.67	339037922	04/21/2026	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	04/20/2026	Restricted Stock	ISSUER			363	04/20/2026	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	03/04/2026	9324	2501381.80
CYNTHIA LOCK TREGILLIS 5601 Great Oaks Parkway San Jose CA 95119	Common	02/26/2026	214	61227.54
CYNTHIA LOCK TREGILLIS 5601 Great Oaks Parkway San Jose CA 95119	Common	02/24/2026	308	86763.60
CYNTHIA LOCK TREGILLIS 5601 Great Oaks Parkway San Jose CA 95119	Common	02/23/2026	130	36897.90
CYNTHIA LOCK TREGILLIS 5601 Great Oaks Parkway San Jose CA 95119	Common	02/06/2026	6780	1833922.20

144: Remarks and Signature

Remarks
Date of Notice	04/21/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	05/23/2025
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)