What restricted share units (RSUs) are involved in the Seagate (STX) Form 4 filing?

The filing shows two restricted share unit awards with underlying ordinary shares of 2,815 and 2,415 , granted under Seagate's 2022 Equity Incentive Plan .

Seagate Technology Holdings plc (STX) CEO discloses RSU vesting and stock trades

Q: What insider transactions did Seagate (STX) CEO William D. Mosley report on 12/09/2025?

On 12/09/2025, William D. Mosley acquired 2,815 and 2,415 ordinary shares at $0 per share and disposed of 1,423 and 1,221 ordinary shares at $282.86 per share.

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

Following the reported 12/09/2025 transactions, William D. Mosley directly owned 448,254 ordinary shares of Seagate Technology Holdings plc.

Q: What is the vesting schedule for the Seagate (STX) RSU grants reported by William D. Mosley?

For one RSU grant, one quarter vested on 09/09/2023 , and for another, one quarter vested on 09/09/2025 ; in each case the remaining portion vests in equal quarterly installments over the following three years , for a total vesting period of four years, subject to continuous employment.

Q: How many restricted share units does the Seagate (STX) CEO beneficially own after the reported transactions?

After the 12/09/2025 activity, William D. Mosley beneficially owned 8,445 and 26,573 restricted share units, as reported in the derivative securities table.

Filing Impact

(Very High)

Filing Sentiment

(Negative)

Form Type

Rhea-AI Filing Summary

Seagate Technology Holdings plc CEO and director William D. Mosley reported equity award–related share transactions. On 12/09/2025 he acquired 2,815 and 2,415 ordinary shares at $0 per share in connection with restricted share units and disposed of 1,423 and 1,221 ordinary shares at $282.86 per share.

After these transactions he directly owned 448,254 ordinary shares. The restricted share units were granted under Seagate's 2022 Equity Incentive Plan and, subject to his continuous employment, vest over four years, with one quarter vesting on 09/09/2023 or 09/09/2025 and the remainder in equal quarterly installments over the following three years. Following the reported activity he beneficially owned 8,445 and 26,573 restricted share units.

Insider Trade Summary

5,230 shares exercised/converted

Mixed 6 txns

Insider MOSLEY WILLIAM D

Role CEO

Type	Security	Shares	Price	Value
Exercise	Restricted Share Unit	2,815	$0.00	--
Exercise	Restricted Share Unit	2,415	$0.00	--
Exercise	Ordinary Shares	2,815	$0.00	--
Tax Withholding	Ordinary Shares	1,423	$282.86	$403K
Exercise	Ordinary Shares	2,415	$0.00	--
Tax Withholding	Ordinary Shares	1,221	$282.86	$345K

Holdings After Transaction: Restricted Share Unit — 8,445 shares (Direct); Ordinary Shares — 448,483 shares (Direct)

Footnotes (1)

Consists of a grant of RSUs awarded to the Reporting Person under the Seagate Technology Holdings plc 2022 Equity Incentive Plan (the "2022 Plan"). Subject to the Reporting Person's continuous employment, such RSUs vested as to one-quarter of the shares 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. Consists of a grant of RSUs awarded to the Reporting Person under the 2022 Plan. Subject to the Reporting Person's continuous employment one-quarter 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.

Form 4 Insider Transactions: What Each Field Means →

12/11/2025 - 04:04 PM

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

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)
12/09/2025

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Ordinary Shares	12/09/2025		M		2,815	A	$0	448,483	D
Ordinary Shares	12/09/2025		F		1,423	D	$282.86	447,060	D
Ordinary Shares	12/09/2025		M		2,415	A	$0	449,475	D
Ordinary Shares	12/09/2025		F		1,221	D	$282.86	448,254	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Restricted Share Unit	$0	12/09/2025		M			2,815	⁽¹⁾	⁽¹⁾	Ordinary Shares	2,815	$0	8,445	D
Restricted Share Unit	$0	12/09/2025		M			2,415	⁽²⁾	⁽²⁾	Ordinary Shares	2,415	$0	26,573	D

Explanation of Responses:

1. Consists of a grant of RSUs awarded to the Reporting Person under the Seagate Technology Holdings plc 2022 Equity Incentive Plan (the "2022 Plan"). Subject to the Reporting Person's continuous employment, such RSUs vested as to one-quarter of the shares 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.

2. Consists of a grant of RSUs awarded to the Reporting Person under the 2022 Plan. Subject to the Reporting Person's continuous employment one-quarter 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.

Remarks:

	/s/ Louis J. Thorson, Attorney-in-Fact for William D. Mosley	12/11/2025
	** 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.

Source: View Original Filing on SEC EDGAR

FAQ

What insider transactions did Seagate (STX) CEO William D. Mosley report on 12/09/2025?

On 12/09/2025, William D. Mosley acquired 2,815 and 2,415 ordinary shares at $0 per share and disposed of 1,423 and 1,221 ordinary shares at $282.86 per share.

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

Following the reported 12/09/2025 transactions, William D. Mosley directly owned 448,254 ordinary shares of Seagate Technology Holdings plc.

What is the vesting schedule for the Seagate (STX) RSU grants reported by William D. Mosley?

For one RSU grant, one quarter vested on 09/09/2023, and for another, one quarter vested on 09/09/2025; in each case the remaining portion vests in equal quarterly installments over the following three years, for a total vesting period of four years, subject to continuous employment.