Western Digital insider plans sale of 447 shares

Western Digital Corporation insider activity is detailed in this notice of proposed sale under Rule 144.

Rhea-AI Filing Summary

Western Digital Corporation insider activity is detailed in this notice of proposed sale under Rule 144. The filer plans to sell 447 shares of Western Digital common stock through Morgan Stanley Smith Barney LLC on or about 01/21/2026, with an aggregate market value of $102,363.00. These shares were acquired as restricted stock from the issuer on 01/20/2026, with 447 securities acquired on that date.

The filing also reports that Cynthia Lock Tregillis sold 2,801 shares of Western Digital common stock on 12/02/2025 for gross proceeds of $449,751.52 during the prior three months. The signer represents that they are not aware of undisclosed material adverse information about Western Digital’s current or prospective operations.

FAQ

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

What insider transaction does this Form 144 report for WDC?

This notice reports a proposed sale of 447 shares of Western Digital common stock, with an aggregate market value of $102,363.00, to be sold through Morgan Stanley Smith Barney LLC.

When were the Western Digital (WDC) shares to be sold acquired?

The 447 Western Digital common shares were acquired on 01/20/2026 as restricted stock from the issuer.

When is the planned sale date for the WDC shares in this Form 144?

The approximate date of sale for the 447 Western Digital common shares is listed as 01/21/2026 and the shares are to be sold on NASDAQ.

What prior Western Digital (WDC) insider sales are disclosed in the past 3 months?

The filing states that Cynthia Lock Tregillis sold 2,801 shares of Western Digital common stock on 12/02/2025 for gross proceeds of $449,751.52.

On which exchange will the WDC shares be sold and through which broker?

The 447 Western Digital common shares are to be sold on the NASDAQ through Morgan Stanley Smith Barney LLC Executive Financial Services.

Does the insider make any representation about undisclosed information on WDC?

Yes. By signing the notice, the person for whose account the securities are to be sold represents that they do not know any material adverse information about Western Digital’s current or prospective operations that has not been publicly disclosed.

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

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Accepted by SEC EDGAR 01/21/2026 - 04:01 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	447	102363.00	341899281	01/21/2026	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	01/20/2026	Restricted Stock	ISSUER			447	01/20/2026	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	12/02/2025	2801	449751.52

144: Remarks and Signature

Remarks
Date of Notice	01/21/2026
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)