[Form 4] Seagate Technology Holdings PLC Insider Trading Activity

Rhea-AI Filing Summary

William D. Mosley, who is listed as both a Director and the CEO of Seagate Technology Holdings plc (STX), reported multiple transactions in the company's ordinary shares and related restricted share units on 09/09/2025.

The Form 4 shows a mix of acquisitions (grants/vests of RSUs) and dispositions (sales) executed the same day. After the reported transactions, Mr. Mosley beneficially owned 471,788 ordinary shares. Several RSU grants vested or were delivered under the Seagate Equity Incentive Plan, and certain share sales were executed at $191.59 per share.

Positive

• Continued substantial ownership: Reporting person retains 471,788 ordinary shares after transactions, signaling ongoing equity alignment with shareholders
• RSU vesting under plan: Multiple restricted share units vested or were delivered under the Seagate Equity Incentive Plan following standard vesting schedules as explained
• Transparent pricing on sales: Dispositions reported with a sale price of $191.59 per share, providing clear execution detail

Negative

• Share sales occurred: Multiple dispositions reduced holdings on the reported date, including sales at $191.59, which may be perceived as partial liquidity-taking
• Complex sequence of transactions: Numerous acquisitions and disposals on the same date could complicate interpretation of insider intent without additional context

Insights

Corporate Governance Expert

TL;DR: Insider received multiple RSU vestings while selling a portion of shares the same day, leaving substantial ownership.

The filing documents routine equity compensation activity for a senior executive who is also a director. The mix of automatic RSU vesting and contemporaneous sales at a disclosed price is consistent with common compensation realization by executives. The remaining beneficial ownership of 471,788 shares indicates continued alignment with shareholders. No new pledges, option exercises for cash, or changes in indirect ownership were reported. Transactions are granular and appear to follow plan vesting schedules disclosed in the explanations.

Securities/Insider Trading Analyst

TL;DR: Multiple same-day trades and RSU vestings; sales price disclosed, activity appears administrative rather than extraordinary.

The Form 4 records multiple transaction codes showing both acquisitions (RSU vestings) and dispositions (sales) all dated 09/09/2025. Dispositions were reported at $191.59 per share, and several RSU grants vested or were partially vested per the plan's schedule. The filing was signed by an attorney-in-fact, indicating the report was filed on behalf of the reporting person. There is no indication of derivative exercises for cash proceeds beyond RSU vesting and share disposals in the submitted tables.

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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^*

MOSLEY WILLIAM D

(Last) (First) (Middle)

SEAGATE TECHNOLOGY HOLDINGS 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)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	CEO

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		9,007	A	$0	467,919	D
Ordinary Shares	09/09/2025		F		4,552	D	$191.59	463,367	D
Ordinary Shares	09/09/2025		M		2,815	A	$0	466,182	D
Ordinary Shares	09/09/2025		F		1,423	D	$191.59	464,759	D
Ordinary Shares	09/09/2025		M		9,662	A	$0	474,421	D
Ordinary Shares	09/09/2025		F		4,883	D	$191.59	469,538	D
Ordinary Shares	09/09/2025		M		4,550	A	$0	474,088	D
Ordinary Shares	09/09/2025		F		2,300	D	$191.59	471,788	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			9,007	(1)	(1)	Ordinary Shares	9,007	$0	0	D
Restricted Share Unit	$0	09/09/2025		M			2,815	(2)	(2)	Ordinary Shares	2,815	$0	11,260	D
Restricted Share Unit	$0	09/09/2025		M			9,662	(3)	(3)	Ordinary Shares	9,662	$0	28,988	D
Restricted Share Unit	$0	09/09/2025		M			4,550	(4)	(4)	Ordinary Shares	4,550	$0	0	D

Explanation of Responses:

1. 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.

2. 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.

3. 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.

4. 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 William D. Mosley	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 William D. Mosley report for STX on 09/09/2025?

The Form 4 reports multiple transactions dated 09/09/2025, including acquisitions from RSU vesting and dispositions (sales) of ordinary shares.

How many Seagate (STX) shares does William D. Mosley beneficially own after these transactions?

Following the reported transactions, the Form 4 shows Mr. Mosley beneficially owned 471,788 ordinary shares.

What was the sale price reported for the dispositions?

Dispositions in the filing were reported at a price of $191.59 per share.

Were any restricted share units (RSUs) involved in these transactions?

Yes. The filing lists multiple RSU grants that vested or were delivered under the Seagate Technology plc Equity Incentive Plan, with explanatory vesting schedules included.

What is William D. Mosley’s relationship to Seagate as listed on the Form 4?

The Form 4 lists Mr. Mosley as both a Director and an Officer (CEO) of Seagate Technology Holdings plc.