[144] Seagate Technology Holdings PLC SEC Filing

Rhea-AI Filing Summary

Seagate Technology Holdings PLC (STX) CEO William D. Mosley filed a Form 144 disclosing his intent to sell 20,000 common shares via Morgan Stanley on or after 1 Aug 2025. At the filing’s indicative price, the transaction would raise roughly $3.14 million and represents just 0.009 % of the company’s 212.68 million shares outstanding.

The stock to be sold was acquired through RSU/PSU grants dated 31 Oct 2014. The notice follows a string of recent Rule 10b5-1 sales by Mosley: 214,347 shares sold between 22 May 2025 and 1 Jul 2025 for aggregate gross proceeds of about $26.0 million. No operational or financial performance data accompany the filing; it is strictly an insider-sale disclosure required under Rule 144.

Insights

Securities Analyst

TL;DR — CEO plans new insider sale after $26 m of recent disposals; minor in % terms but could pressure sentiment.

Mosley’s proposed 20 k-share sale is immaterial to the float, yet it extends an active selling pattern totaling >214 k shares in the last three months. Persistent executive selling—even under a 10b5-1 plan—can signal limited near-term confidence and may weigh on perception as investors debate cyclicality in the storage market. With no offsetting positive catalyst disclosed, I view the filing as incrementally negative but not thesis-changing.

Corporate Governance Expert

TL;DR — Rule 144 filing shows compliant process; pattern raises optics concerns.

The use of a pre-arranged 10b5-1 plan and timely Form 144 submission demonstrates good governance practice. However, the sheer dollar amount—≈$29 m including the new intent—may attract proxy-advisory scrutiny on pay-for-performance alignment. Boards typically monitor cumulative executive sales versus ownership guidelines; investors will look for confirmation that Mosley’s remaining stake remains substantial.

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

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	20000	3140200.00	212677178	08/01/2025	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	10/31/2014	RSUs/PSUs	Issuer			20000	10/31/2014	N/A

* 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
10b5-1 Sales for WILLIAM MOSLEY 121 Woodlands Avenue 5 Singapore U0 739009	Common	07/01/2025	20000	2893120.00
10b5-1 Sales for WILLIAM MOSLEY 121 Woodlands Avenue 5 Singapore U0 739009	Common	06/09/2025	54347	7075425.06
10b5-1 Sales for WILLIAM MOSLEY 121 Woodlands Avenue 5 Singapore U0 739009	Common	06/03/2025	50000	6013555.00
10b5-1 Sales for WILLIAM MOSLEY 121 Woodlands Avenue 5 Singapore U0 739009	Common	06/02/2025	20000	2377534.00
10b5-1 Sales for WILLIAM MOSLEY 121 Woodlands Avenue 5 Singapore U0 739009	Common	05/22/2025	70000	7663048.00

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)