Seagate officer plans 3,575-share tax-cover sale

Rhea-AI Filing Summary

Seagate Technology Holdings plc (STX) reported a planned sale of common stock under Rule 144 for officer John Christopher Morris. The notice lists 3,575 shares of common stock with Morgan Stanley as broker, and indicates that sales will be made pursuant to an issuer-mandated sell-to-cover program solely to satisfy tax withholding obligations on equity compensation. Related restricted stock unit vesting events on 08/20/2026 cover awards tied to 4,070, 1,221, and 1,764 shares of common stock as compensation for services. The filing also discloses prior sales of common stock by John C. Morris during the past three months.

Key Figures

Planned common stock amount: 3,575 shares Value figure associated with securities information: 3,036,443.41 Restricted stock unit vesting shares: 4,070 shares +5 more

8 metrics

Planned common stock amount 3,575 shares Common stock with Morgan Stanley listed in the securities information section

Value figure associated with securities information 3,036,443.41 Numeric value printed alongside 3,575 shares of common stock

Restricted stock unit vesting shares 4,070 shares Common stock related to RSU vesting on 08/20/2026 as compensation for services

Restricted stock unit vesting shares 1,221 shares Common stock related to RSU vesting on 08/20/2026 as compensation for services

Restricted stock unit vesting shares 1,764 shares Common stock related to RSU vesting on 08/20/2026 as compensation for services

Past sale on 06/12/2026 898 shares; 790,410.62 Common stock sold by John C. Morris during the past 3 months

Past sale on 08/03/2026 168 shares; 137,383.68 Common stock sold by John C. Morris during the past 3 months

Past sale on 06/09/2026 574 shares; 1,643.32 Common stock sold by John C. Morris during the past 3 months

Key Terms

Rule 144, Restricted Stock Unit Vesting, sell-to-cover, Attorney-in-Fact

4 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Restricted Stock Unit Vesting financial

"Common stock | 08/20/2026 | Restricted Stock Unit Vesting | Issuer"

sell-to-cover financial

"Sales to be made pursuant to Issuer mandated sell-to-cover solely"

Sell-to-cover is when part of newly issued or exercised company stock is immediately sold to pay required taxes and fees, so the recipient keeps the remaining shares. For investors this matters because it reduces the number of shares insiders or employees actually hold after a grant, can create small, routine share sales that aren’t signal of cashing out, and slightly increases share supply on the market—like selling a portion of a paycheck to cover the tax bill.

Attorney-in-Fact regulatory

"Signature | /s/ Dawn Ledbetter. Attorney-in-Fact for John C. Morris"

An attorney-in-fact is the person or entity given legal authority through a power of attorney to act on behalf of another for specific tasks, such as signing documents, voting shares, or handling transactions. For investors, this matters because it lets a trusted representative make timely decisions or complete paperwork when the owner cannot, much like handing keys to someone to run errands on your behalf—so checks on scope and limits of that authority are important.

FAQ

What does the Form 144 filed in relation to STX disclose about upcoming sales?

The Form 144 discloses a planned sale of 3,575 shares of Seagate common stock through Morgan Stanley. The sales are stated to be made under an issuer-mandated sell-to-cover program solely to satisfy tax withholding obligations related to equity compensation.

Who is the insider associated with the STX Form 144 filing?

The notice relates to John Christopher Morris, identified as an officer of Seagate Technology Holdings plc. The filing covers sales of Seagate common stock for his account under Rule 144 and includes information on his recent transactions.

How are the STX share sales described in the remarks section of the Form 144?

The remarks state that sales are to be made pursuant to an issuer mandated sell-to-cover and are solely to satisfy tax withholding obligations. This ties the transactions to tax obligations arising from equity compensation, rather than discretionary open-market sales.

What restricted stock unit vesting transactions are disclosed for STX in this Form 144?

The filing lists restricted stock unit vesting on 08/20/2026 relating to common stock awards tied to 4,070, 1,221, and 1,764 shares. Each is identified as compensation for services with the issuer as the counterparty.

What STX common stock sales in the past three months are reported for John C. Morris?

The notice reports three prior sales of Seagate common stock: 898 shares on 06/12/2026 for 790,410.62, 574 shares on 06/09/2026 for 1,643.32, and 168 shares on 08/03/2026 for 137,383.68.

Who signed the STX Form 144 and in what capacity?

The Form 144 is signed by Dawn Ledbetter as Attorney-in-Fact for John C. Morris. The signature is provided under a power of attorney referenced in the remarks as “PoA attached.”

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Available on EDGAR 08/21/2026 - 07:41 PM Accepted by SEC EDGAR 08/21/2026 - 07:40 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	0001988271
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	Seagate Technology Holdings plc
SEC File Number	001-31560
Address of Issuer	121 WOODLANDS AVENUE 5 SINGAPORE SINGAPORE 739009
Phone	65 6412 5172
Name of Person for Whose Account the Securities are To Be Sold	Morris John Christopher
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 Stock	Morgan Stanley 1 New York Plaza 8th Floor New York NY 10004	3575	3036443.41	226644518	08/21/2026	NASDAQGS

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 stock	08/20/2026	Restricted Stock Unit Vesting	Issuer			4070	08/20/2026	Compensation for services
Common Stock	08/20/2026	Restricted Stock Unit Vesting	Issuer			1221	08/20/2026	Compensation for services
Common Stock	08/20/2026	Restricted Stock Unit Vesting	Issuer			1764	08/20/2026	Compensation for services

* 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
John C. Morris 47488 Kato Rd Fremont CA 94538	Common Stock	06/12/2026	898	790410.62
John C. Morris 47488 Kato Road Fremont CA 94538	Common Stock	08/03/2026	168	137383.68
John C. Morris 47488 Kato Rd Fremont CA 94538	Common Stock	06/09/2026	574	1643.32

144: Remarks and Signature

Remarks	Sales to be made pursuant to Issuer mandated sell-to-cover solely to satisfy tax withholding obligations. PoA attached.
Date of Notice	08/21/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	08/20/2026
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/ Dawn Ledbetter. Attorney-in-Fact for John C. Morris
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)