[Form 4] Seagate Technology Holdings PLC Insider Trading Activity

Rhea-AI Filing Summary

John C. Morris, EVP & CTO of Seagate Technology Holdings plc (STX), filed a Form 4 reporting stock award vesting and share transactions on 09/09/2025. The filing shows multiple grants of restricted share units (RSUs) that vested or partially vested on that date, converting to ordinary shares at no cash price, and contemporaneous market sales of ordinary shares at $191.59 per share. The reported transactions resulted in the reporting person holding 24,679 ordinary shares direct after the activity. The filer also updated prior reporting to include 8,676 shares held continuously but omitted earlier due to an administrative oversight. The Form 4 was signed by an attorney-in-fact on behalf of the reporting person.

Positive

• Disclosure corrected to include 8,676 shares previously held but omitted due to an administrative oversight
• RSU vesting events were disclosed, converting awards into ordinary shares with clear vesting schedules

Negative

• Open-market sales totaling 2,496 shares were reported at $191.59 per share on 09/09/2025, reducing the officer's holdings
• Administrative oversight previously led to underreporting of 8,676 shares, indicating past disclosure control gaps

Insights

Financial Analyst

TL;DR: Insider received vested RSUs and sold shares at $191.59; overall disclosure corrects prior omission.

The filing documents standard equity compensation events: multiple RSU vestings converted into ordinary shares on 09/09/2025 and several open-market sales at $191.59 per share. Such mixed activity—vesting plus partial sales—is consistent with routine executive liquidity and tax-management practices. The update adding 8,676 previously unreported shares addresses an administrative oversight and improves disclosure completeness. There is no indication of unusual timing relative to nonpublic announcements in the filing itself.

Corporate Governance Expert

TL;DR: Filing is timely and corrects prior reporting; sales and RSU vesting are standard but require clear internal controls.

The Form 4 discloses vested RSUs and sales by an officer, and it corrects past omission of shares held since before becoming a reporting person. From a governance perspective, the correction is important for transparency. The signatory acted via attorney-in-fact, which is permitted, but firms should ensure robust processes to prevent reporting oversights. The transactions disclosed are routine and do not, by themselves, suggest governance failures beyond the earlier administrative omission.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Morris John Christopher

(Last) (First) (Middle)

SEAGATE TECHNOLOGY PLC

47488 KATO ROAD

(Street)

FREMONT CA 94538

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Seagate Technology Holdings plc [ STX ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP & CTO

3. Date of Earliest Transaction (Month/Day/Year)
09/09/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Ordinary Shares	09/09/2025		M		1,885	A	$0	23,590(1)(2)	D
Ordinary Shares	09/09/2025		F		860	D	$191.59	22,730	D
Ordinary Shares	09/09/2025		M		499	A	$0	23,229	D
Ordinary Shares	09/09/2025		F		228	D	$191.59	23,001	D
Ordinary Shares	09/09/2025		M		2,526	A	$0	25,527	D
Ordinary Shares	09/09/2025		F		1,152	D	$191.59	24,375	D
Ordinary Shares	09/09/2025		M		560	A	$0	24,935	D
Ordinary Shares	09/09/2025		F		256	D	$191.59	24,679	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Share Unit	$0	09/09/2025		M			1,885	(3)	(3)	Ordinary Shares	1,885	$0	0	D
Restricted Share Unit	$0	09/09/2025		M			499	(4)	(4)	Ordinary Shares	499	$0	1,997	D
Restricted Share Unit	$0	09/09/2025		M			2,526	(5)	(5)	Ordinary Shares	2,526	$0	7,579	D
Restricted Share Unit	$0	09/09/2025		M			560	(6)	(6)	Ordinary Shares	560	$0	0	D

Explanation of Responses:

1. The amount of securities beneficially owned has been updated to reflect 8,676 shares held continuously by the reporting person since prior to becoming a reporting person director for the Company, but not previously reported due to an administrative oversight.

2. Includes 168 Ordinary Shares purchased by Reporting Person on July 31, 2025 under the Issuer's Employee Stock Purchase Plan. Such acquisition is exempt from reporting pursuant to Rule 16b-3 under the Securities Exchange Act of 1934.

3. Consists of a grant of RSUs awarded to the Reporting Person under the Seagate Technology plc Equity Incentive Plan (the "Plan"). Subject to the Reporting Person's continuous employment, one-quarter of the shares vested on September 9, 2022 and each one-year anniversary thereafter for a total vesting period of four years.

4. Consists of a grant of RSUs awarded to the Reporting Person under the Plan. Subject to the Reporting Person's continuous employment, one-quarter of the shares vested on September 9, 2023 and the remaining portion shall vest in equal quarterly installments over the following three years for a total vesting period of four years.

5. Consists of a grant of RSUs awarded to the Reporting Person under the Plan. Subject to the Reporting Person's continuous employment, one-quarter of the shares vested on September 9, 2025 and the remaining portion shall vest in equal quarterly installments over the following three years for a total vesting period of four years.

6. Consists of a grant of RSUs awarded to the Reporting Person under the Plan. Such RSUs vested 100% on September 9, 2025, the first anniversary of the grant.

Remarks:

	/s/ Louis J. Thorson, Attorney-in-Fact for John C. Morris	09/11/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What transactions did John C. Morris report on Form 4 for STX?

The Form 4 reports multiple RSU vestings that converted into ordinary shares and open-market sales on 09/09/2025, with sales executed at $191.59 per share.

How many shares does the reporting person hold after the reported transactions (STX)?

The filing shows the reporting person beneficially owned 24,679 ordinary shares direct following the reported transactions.

Were any previously unreported shares disclosed in this filing for STX?

Yes. The filing updates beneficial ownership to include 8,676 shares held continuously prior to becoming a reporting person but not previously reported due to an administrative oversight.

What was the sale price for the shares sold by the reporting person in the Form 4 (STX)?

Sales reported in the Form 4 were executed at a price of $191.59 per share.

Did the Form 4 indicate any derivative transactions for STX?

The filing reports RSUs that vested and converted into ordinary shares; no separate option exercises or other derivatives with cash prices are listed.