Seagate (STX) CEO vests 3,319 RSUs; 1,658 shares withheld for taxes

Rhea-AI Filing Summary

Seagate Technology Holdings plc CEO William D. Mosley reported routine equity compensation activity. On March 11, 2026, he exercised restricted share units covering 3,319 ordinary shares, converting them at $0.00 per share as part of a previously granted award.

Of these shares, 1,658 ordinary shares were automatically withheld at a value of $385.97 per share to cover tax obligations, a non-market disposition coded as tax withholding. Following these transactions, Mosley directly owned 400,175 ordinary shares.

The vested units relate to a restricted share unit grant under the Seagate Technology Holdings plc 2022 Equity Incentive Plan, which began vesting on September 11, 2024 and continues in equal quarterly installments over four years, subject to his continued employment.

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)
03/11/2026

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	03/11/2026		M		3,319	A	$0	401,833	D
Ordinary Shares	03/11/2026		F		1,658	D	$385.97	400,175	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	03/11/2026		M			3,319	(1)	(1)	Ordinary Shares	3,319	$0	19,914	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	03/12/2026
	** 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.
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FAQ

What insider transaction did Seagate (STX) CEO William Mosley report?

Seagate CEO William Mosley reported exercising restricted share units for 3,319 ordinary shares. These shares came from a prior equity grant that is vesting over four years, reflecting routine compensation rather than an open-market share purchase or sale.

How many Seagate (STX) shares were withheld for taxes in this Form 4?

In this filing, 1,658 ordinary shares of Seagate were withheld to cover tax obligations at a value of $385.97 per share. This tax-withholding disposition is not an open-market sale but an automatic mechanism tied to the equity award vesting.

How many Seagate (STX) shares does CEO William Mosley own after this transaction?

After these transactions, CEO William Mosley directly owned 400,175 ordinary shares of Seagate. This total reflects the newly vested shares from restricted share units, net of the portion withheld to satisfy associated tax liabilities under the company’s equity plan.

What is the vesting schedule for the Seagate (STX) RSUs in this Form 4?

The restricted share units were granted under the 2022 Equity Incentive Plan. One quarter vested starting on September 11, 2024, with the remaining units vesting in equal quarterly installments over the following three years, conditioned on Mosley’s continued employment.

Was this Seagate (STX) CEO transaction an open-market stock purchase or sale?

No. The Form 4 shows an exercise of restricted share units and a related tax-withholding disposition. The codes “M” and “F” indicate derivative conversion and tax payment using shares, not an open-market buy or sell decision in the company’s stock.