Cynthia Tregillis sells shares; WDC (NASDAQ: WDC) reports multiple insider dispositions

Rhea-AI Filing Summary

Cynthia Lock Tregillis reports sales of common stock. The filing lists open-market dispositions of 130 shares on 02/23/2026 for $36,897.90, 6,780 shares on 02/06/2026 for $1,833,922.20, 447 shares on 01/21/2026 for $102,363.00, and 2,801 shares on 12/02/2025 for $449,751.53. The form also lists 308 restricted shares to be sold (issuer-directed) dated 02/21/2026.

Insights

Insider Transactions Analyst

Multiple small-to-large insider dispositions were reported across late 2025 and early 2026.

The filing itemizes four past transactions: 2,801 shares on 12/02/2025 for $449,751.53, 447 shares on 01/21/2026 for $102,363.00, 6,780 shares on 02/06/2026 for $1,833,922.20, and 130 shares on 02/23/2026 for $36,897.90.

Timing and sizes vary, with one large sale on 02/06/2026; the filing also notes 308 restricted shares dated 02/21/2026 identified as issuer-directed. Cash-flow treatment and motive are not stated in the excerpt.

Securities Compliance Counsel

Form 144 disclosure records compliant sale reporting rather than a corporate action.

The schedule discloses specific share counts, dates, and proceeds for each disposition, fulfilling disclosure requirements for restricted or control sales under the securities rules. The 308 restricted shares are listed with an issuer designation dated 02/21/2026.

Regulatory implications depend on whether the sales were prearranged or exempt; subsequent filings or broker confirmations would clarify compliance mechanics.

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

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

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

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	308	86763.60	339037922	02/24/2026	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	02/21/2026	Restricted Stock	ISSUER			308	02/21/2026	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	02/23/2026	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
Cynthia LOCK TREGILLIS 5601 Great Oaks Parkway San Jose CA 95119	Common	12/02/2025	2801	449751.53

144: Remarks and Signature

Remarks

Date of Notice

Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1

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

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What did the Form 144 for WDC disclose?

It disclosed multiple insider sales of common stock by Cynthia Lock Tregillis. The filing lists four past dispositions and a planned sale of 308 restricted shares dated 02/21/2026 with reported proceeds per transaction.

How many shares did Cynthia Lock Tregillis sell in the largest reported trade?

The largest reported trade was 6,780 shares on 02/06/2026. That sale is shown with proceeds of $1,833,922.20 in the filing excerpt.

Are the planned restricted shares part of an issuer-directed sale for WDC?

Yes. The filing lists 308 restricted shares dated 02/21/2026 and marks them as ISSUER, indicating an issuer-related restricted-holdings disposition as shown in the excerpt.

Do these Form 144 entries state the reason for the insider sales?

No. The excerpt lists dates, share counts, and proceeds but does not state motives. The filing does not include statements explaining reasons or whether sales were prearranged.