Seagate Technology (NASDAQ: STX) CEO discloses RSU vesting and remaining awards

Rhea-AI Filing Summary

Seagate Technology Holdings plc CEO and director William D. Mosley reported equity compensation-related share transactions dated December 9, 2025. Through the vesting of restricted share units (RSUs), he acquired 2,815 and 2,415 ordinary shares at a price of $0, reflecting grants made under the Seagate Technology Holdings plc 2022 Equity Incentive Plan (the "2022 Plan").

On the same date, 1,423 and 1,221 ordinary shares were disposed of at $282.86 per share in code "F" transactions, and Mosley held 448,254 ordinary shares directly following the reported activity. The two RSU grants each have four-year vesting schedules: for one grant, one quarter vested on September 9, 2023; for the other, one quarter vested on September 9, 2025, with remaining portions vesting in equal quarterly installments over the following three years. After these transactions, he continued to hold 8,445 and 26,573 RSUs from the two grants.

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^*

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)
12/09/2025

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	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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
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.
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FAQ

What insider share transactions did Seagate Technology (STX) CEO report on December 9, 2025?

CEO and director William D. Mosley reported RSU-related activity on December 9, 2025. He acquired 2,815 and 2,415 ordinary shares at a price of $0 through the vesting of restricted share units, and disposed of 1,423 and 1,221 shares at $282.86 per share in code "F" transactions.

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

Following the reported December 9, 2025 transactions, William D. Mosley beneficially owned 448,254 Seagate Technology Holdings plc ordinary shares directly.

What RSU awards are involved in the Seagate Technology (STX) CEO’s Form 4 filing?

The filing involves two grants of restricted share units (RSUs) awarded under the Seagate Technology Holdings plc 2022 Equity Incentive Plan (the "2022 Plan"). These RSUs were the source of the 2,815 and 2,415 ordinary shares acquired at $0 upon vesting.

What is the vesting schedule for the RSUs held by Seagate Technology (STX) CEO William D. Mosley?

For the first RSU grant, one quarter of the shares vested on September 9, 2023, with the remaining portion vesting in equal quarterly installments over the following three years, for a total four-year vesting period. For the second grant, one quarter vested on September 9, 2025, with the rest also vesting in equal quarterly installments over the next three years.

How many restricted share units does the Seagate Technology (STX) CEO continue to hold?

After the December 9, 2025 transactions, William D. Mosley continued to beneficially own 8,445 RSUs from one grant and 26,573 RSUs from another grant, both under the 2022 Plan.

Do the reported Seagate Technology (STX) insider transactions involve open-market share purchases?

No. The reported activity consists of RSU vesting (code "M") resulting in shares acquired at $0 and code "F" transactions disposing of shares at $282.86 per share, rather than open-market purchases.