WDC Form 144: 214 Restricted Shares Listed for Sale

Company: WDC Rule 144 notice reporting intended and recent restricted‑stock dispositions by Cynthia Lock Tregillis.

Rhea-AI Filing Summary

Company: WDC Rule 144 notice reporting intended and recent restricted‑stock dispositions by Cynthia Lock Tregillis.

The filing lists 214 restricted shares identified for sale on 05/25/2026, and shows recent past sales: 9,324 shares on 03/04/2026, 363 shares on 04/21/2026, 106 shares on 05/21/2026, and 308 shares on 05/22/2026. Dollar figures are shown alongside each sale in the excerpt.

Key Figures

Restricted shares to be sold: 214 shares Sale on 03/04/2026: 9,324 shares Sale on 04/21/2026: 363 shares +3 more

6 metrics

Restricted shares to be sold 214 shares intended sale date <date>05/25/2026</date>

Sale on 03/04/2026 9,324 shares transaction dated <date>03/04/2026</date> with $2,501,381.80 shown

Sale on 04/21/2026 363 shares transaction dated <date>04/21/2026</date> with $136,883.67 shown

Sale on 05/21/2026 106 shares transaction dated <date>05/21/2026</date> with $48,640.22 shown

Sale on 05/22/2026 308 shares transaction dated <date>05/22/2026</date> with $150,491.88 shown

Broker/dealer listed Morgan Stanley Smith Barney LLC firm address: 1 New York Plaza, 8th Floor, New York NY 10004

Key Terms

Restricted Stock, Form 144, Issuer

3 terms

Restricted Stock financial

"Securities To Be Sold | Common | 05/25/2026 | 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.

Form 144 regulatory

"CONTENT METADATA: "form_type": "144""

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 regulatory

"Securities To Be Sold ... | ISSUER"

FAQ

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

What does WDC's Form 144 filing disclose about Cynthia Lock Tregillis?

The filing discloses intended and completed restricted‑stock dispositions by Cynthia Lock Tregillis. It lists 214 restricted shares to be sold on 05/25/2026 and several sales earlier in 2026 with share counts and dollar amounts.

How many shares does the Form 144 show were sold by the reporting person in 2026?

The excerpt lists four recent sales in 2026 totaling discrete transactions: 9,324, 363, 106, and 308 shares on specific dates. Each sale row in the filing includes an associated dollar figure.

When is the 214 restricted shares sale reported to occur for WDC?

The filing identifies 214 restricted shares with an intended sale date of 05/25/2026. The record labels these securities as Restricted Stock and indicates the issuer as the source.

Who is the broker or placement agent listed in the Form 144 for WDC?

The excerpt lists Morgan Stanley Smith Barney LLC, 1 New York Plaza as the broker/firm associated with the filing. The broker address and NASDAQ routing details appear in the filing header.

Do the dollar amounts in the filing indicate proceeds from the sales?

The rows show dollar figures adjacent to each transaction (for example, $2,501,381.80 for 9,324 shares). The filing presents those amounts with each sale row; the document ties them to the respective transaction lines.

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

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Accepted by SEC EDGAR 05/27/2026 - 04:04 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	214	115480.82	344682131	05/27/2026	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	05/25/2026	Restricted Stock	ISSUER			214	05/25/2026	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	05/22/2026	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
CYNTHIA LOCK TREGILLIS 5601 Great Oaks Parkway San Jose CA 95119	Common	03/04/2026	9324	2501381.80

144: Remarks and Signature

Remarks
Date of Notice	05/27/2026
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)