Seagate CEO Mosley exercises RSUs, sells shares in filing

Seagate Technology Holdings plc CEO and director William D. Mosley reported equity transactions dated December 11, 2025.

Rhea-AI Filing Summary

Seagate Technology Holdings plc CEO and director William D. Mosley reported equity transactions dated December 11, 2025. He acquired 3,319 ordinary shares at a price of $0, linked to a restricted share unit award under the Seagate Technology Holdings plc 2022 Equity Incentive Plan, and disposed of 1,678 ordinary shares at $307.845 per share on the same date.

Following these transactions, Mosley beneficially owned 449,895 ordinary shares directly and 23,233 restricted share units. The restricted share unit grant described vests over four years, with one-quarter vesting starting on September 11, 2024 and the remainder vesting in equal quarterly installments over the following three years, subject to his continuous employment.

Insider Trade Summary

3,319 shares exercised/converted

Exercise 3 txns

Insider MOSLEY WILLIAM D

Role CEO

Type	Security	Shares	Price	Value
Exercise	Restricted Share Unit	3,319	$0.00	$0.00
Exercise	Ordinary Shares	3,319	$0.00	$0.00
Exercise Price or Tax Liability	Ordinary Shares	1,678	$307.845	$517K

Holdings After Transaction: Restricted Share Unit — 23,233 contracts (Direct); Ordinary Shares — 449,895 shares (Direct)

Footnotes (1)

1. F1. Consists of a grant of restricted share unit awarded to the reporting person under the Seagate Technology Holdings plc 2022 Equity Incentive Plan. Subject to the Reporting Person's continuous employment, one-quarter vested starting on September 11, 2024 and then in equal quarterly installments over the following three years for a total vesting period of four years.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider share transactions did Seagate (STX) CEO William D. Mosley report?

William D. Mosley reported acquiring 3,319 ordinary shares at $0 and disposing of 1,678 ordinary shares at $307.845 per share on December 11, 2025.

How many Seagate (STX) shares does CEO William D. Mosley own after this Form 4?

After the reported transactions, William D. Mosley beneficially owned 449,895 ordinary shares directly and 23,233 restricted share units.

What equity award is referenced in William D. Mosley’s Seagate (STX) Form 4?

The filing references a restricted share unit grant awarded to William D. Mosley under the Seagate Technology Holdings plc 2022 Equity Incentive Plan.

What is the vesting schedule of William D. Mosley’s Seagate (STX) restricted share units?

Subject to his continuous employment, one-quarter of the restricted share unit grant vested starting on September 11, 2024, with the remaining units vesting in equal quarterly installments over the next three years, for a total vesting period of four years.

What roles does William D. Mosley hold at Seagate Technology Holdings plc (STX)?

William D. Mosley is reported as both a director and an officer of Seagate Technology Holdings plc, serving as CEO.

Was the reported Seagate (STX) transaction filed by a single reporting person?

Yes. The Form 4 indicates it was filed by one reporting person, William D. Mosley.

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Accepted by SEC EDGAR 12/12/2025 - 04:17 PM Learn about SEC filing dates

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)
12/11/2025

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	12/11/2025		M		3,319	A	$0	451,573	D
Ordinary Shares	12/11/2025		F		1,678	D	$307.845	449,895	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	12/11/2025		M			3,319	(1)	(1)	Ordinary Shares	3,319	$0	23,233	D

Explanation of Responses:

1. Consists of a grant of restricted share unit awarded to the reporting person under the Seagate Technology Holdings plc 2022 Equity Incentive Plan. Subject to the Reporting Person's continuous employment, one-quarter vested starting on September 11, 2024 and then in equal quarterly installments over the following three years for a total vesting period of four years.

Remarks:

	/s/ Louis J. Thorson, Attorney-in-Fact for William D. Mosley	12/12/2025
	** 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.