WDC Form 144: Insider sales reported by Cynthia Tregillis

Western Digital Corporation reported Form 144 notice of intended sales of its common stock by Cynthia Lock Tregillis.

Rhea-AI Filing Summary

Western Digital Corporation reported Form 144 notice of intended sales of its common stock by Cynthia Lock Tregillis. The excerpt lists five transactions in the past three months: 6,780 shares on 02/06/2026 for $1,833,922.20, 447 shares on 01/21/2026 for $102,363.00, 308 shares on 02/24/2026 for $86,763.60, 214 shares on 02/26/2026 for $61,227.54, and 130 shares on 02/23/2026 for $36,897.90. The filing also lists multiple restricted stock awards delivered by the issuer on dates between 01/20/2026 and 03/03/2026 totaling listed grant amounts.

Insights

Securities Compliance Counsel

Routine Form 144 reporting of insider sales; no material new corporate event shown.

The filing lists specific sale dates, share counts, and gross proceeds for five transactions by Cynthia Lock Tregillis, including 6,780 shares for $1,833,922.20 on 02/06/2026. These entries match Form 144’s purpose: notice of proposed sale of restricted/controlled securities.

Timing and amounts are explicit in the excerpt; cash‑flow recipients are the selling person. The excerpt also records issuer restricted stock grants on dates from 01/20/2026 to 03/03/2026. Subsequent SEC filings or Form 4 may show final dispositions.

FAQ

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

What did the WDC Form 144 disclose about Cynthia Lock Tregillis?

The filing lists five sales totaling specific shares and proceeds. It shows sales of 6,780; 447; 308; 214; and 130 shares on listed dates, with gross proceeds such as $1,833,922.20 for the largest lot on 02/06/2026.

When did the largest reported sale occur in the WDC excerpt?

The largest reported sale occurred on 02/06/2026. That sale was for 6,780 shares with gross proceeds of $1,833,922.20, as shown in the Form 144 excerpt.

Does the excerpt show any issuer grants or restricted stock deliveries?

Yes — the excerpt lists restricted stock deliveries by the issuer. Grant dates shown include 01/20/2026, 02/20/2026, 02/21/2026, 02/25/2026, and 03/03/2026 with listed share amounts.

Are the transaction proceeds attributed in the Form 144 excerpt?

Yes — gross proceeds are shown for each reported sale. Examples include $1,833,922.20 for 6,780 shares and $102,363.00 for 447 shares, each paired with its sale date in the excerpt.

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

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

Add on Google Not now

Accepted by SEC EDGAR 03/04/2026 - 04:05 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	8547	2300985.73	339037922	03/04/2026	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	03/03/2026	Restricted Stock	Issuer			3539	03/03/2026	Not Applicable
Common	02/20/2026	Restricted Stock	Issuer			592	02/20/2026	Not Applicable
Common	02/25/2026	Restricted Stock	Issuer			976	02/25/2026	Not Applicable
Common	02/21/2026	Restricted Stock	Issuer			1403	02/21/2026	Not Applicable
Common	01/20/2026	Restricted Stock	Issuer			2037	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	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
CYNTHIA LOCK TREGILLIS 5601 Great Oaks Parkway San Jose CA 95119	Common	01/21/2026	447	102363.00

144: Remarks and Signature

Remarks
Date of Notice	03/04/2026
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)