Seagate CEO sells 97,889.25 shares for taxes

Seagate’s CEO had performance units vest into ordinary shares, with part of the shares sold to cover tax withholding obligations.

Rhea-AI Filing Summary

Seagate Technology Holdings plc (STX) reported that CEO and director William D. Mosley had performance-based restricted share units granted on September 11, 2023 vest on September 14, 2026 and settle into 177,000 Ordinary Shares following certification of the applicable performance conditions by the Compensation and People Committee. On September 15, 2026, Mosley then sold 97,889.25 Ordinary Shares at $772.1432 per share in sales made pursuant to an issuer-mandated sell-to-cover arrangement solely to satisfy tax withholding obligations.

Insider Trade Summary

Exercise and sale activity reported; no spread calculated

Exercise and Sale 3 txns

Insider MOSLEY WILLIAM D

Role CEO

Sold 97,889.25 shs ($75.58M)

Approx. gross sale proceeds $75.58M

Approx. exercise cost $0.00

Type	Security	Shares	Price	Value
Sale	Ordinary Shares F2	97,889.25	$772.1432	$75.58M
Exercise	Performance-Based Restricted Share Units F3	177,000	$0.00	$0.00
Exercise	Ordinary Shares F1	177,000	$0.00	$0.00

Holdings After Transaction: Performance-Based Restricted Share Units — 0 contracts (Direct); Ordinary Shares — 378,108.25 shares (Direct)

Footnotes (3)

1. F1. Represents Ordinary Shares issued upon the vesting and settlement of Performance Share Units granted on September 11, 2023, following certification by the Compensation and People Committee of the achievement of the applicable performance conditions.
2. F2. Represents sales made pursuant to Issuer mandated sell-to-cover solely to satisfy tax withholding obligations.
3. F3. Performance Share Units granted on September 11, 2023 vested and were settled in Ordinary Shares upon certification of the applicable performance conditions by the Compensation and People Committee.

Key Figures

Shares sold: 97,889.25 shares Sale price per share: $772.1432 per share Performance Share Units vested: 177,000 units +2 more

5 metrics

Shares sold 97,889.25 shares Ordinary Shares sold by William D. Mosley on September 15, 2026

Sale price per share $772.1432 per share Price for Ordinary Shares sold on September 15, 2026 in issuer-mandated sell-to-cover

Performance Share Units vested 177,000 units Performance Share Units granted on September 11, 2023 that vested and settled into Ordinary Shares on September 14, 2026

Underlying Ordinary Shares from vested units 177,000 shares Ordinary Shares received upon settlement of vested Performance Share Units

Remaining Performance-Based Restricted Share Units 0 units Balance of the reported Performance-Based Restricted Share Units after vesting and settlement

Key Terms

Performance Share Units, issuer mandated sell-to-cover, tax withholding obligations, Compensation and People Committee

4 terms

Performance Share Units financial

"Performance Share Units granted on September 11, 2023 vested and were settled in Ordinary Shares"

Performance share units are a type of company stock award given to employees that depend on the company meeting specific goals or targets. If these goals are achieved, the employee receives shares or the value of shares; if not, they may receive little or no compensation. This aligns employees’ interests with the company's success and encourages performance that benefits investors.

issuer mandated sell-to-cover financial

"Represents sales made pursuant to Issuer mandated sell-to-cover solely to satisfy tax withholding obligations."

tax withholding obligations financial

"Represents sales made pursuant to Issuer mandated sell-to-cover solely to satisfy tax withholding obligations."

Compensation and People Committee financial

"following certification by the Compensation and People Committee of the achievement of the applicable performance conditions."

FAQ

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

What insider transactions did Seagate Technology Holdings plc (STX) disclose for its CEO?

The CEO, William D. Mosley, had 177,000 Performance Share Units vest and settle into Ordinary Shares on September 14, 2026, and on September 15, 2026 sold 97,889.25 Ordinary Shares to cover tax withholding obligations through an issuer-mandated sell-to-cover.

How many Seagate (STX) shares did the CEO sell and at what price?

On September 15, 2026, William D. Mosley sold 97,889.25 Ordinary Shares of Seagate at a price of $772.1432 per share in transactions described as issuer-mandated sell-to-cover solely to satisfy tax withholding obligations.

What equity award vested for Seagate (STX) CEO William D. Mosley?

Performance Share Units granted to William D. Mosley on September 11, 2023 vested on September 14, 2026 after the Compensation and People Committee certified achievement of the applicable performance conditions, and were settled in 177,000 Ordinary Shares.

Were the Seagate (STX) CEO’s recent share sales under a 10b5-1 trading plan?

The Form 4 indicates no Rule 10b5-1 trading plan for these transactions, and the footnotes describe the sales as issuer mandated sell-to-cover transactions solely to satisfy tax withholding obligations upon vesting of performance-based awards.

Did the Seagate (STX) CEO retain any performance-based restricted share units after the vesting event?

The filing shows that 177,000 Performance-Based Restricted Share Units vested and were settled into Ordinary Shares, leaving a reported balance of 0 such units after the transaction associated with that award.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/16/2026 - 04:10 PM Accepted by SEC EDGAR 09/16/2026 - 04:10 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 CALIFORNIA 94538

(City) (State) (Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/14/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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	09/14/2026		M		177,000(1)	A	$0	475,997.5	D
Ordinary Shares	09/15/2026		S		97,889.25(2)	D	$772.1432	378,108.25	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
Performance-Based Restricted Share Units	$0	09/14/2026		M			177,000	(3)	(3)	Ordinary Shares	177,000	$0	0	D

Explanation of Responses:

1. Represents Ordinary Shares issued upon the vesting and settlement of Performance Share Units granted on September 11, 2023, following certification by the Compensation and People Committee of the achievement of the applicable performance conditions.

2. Represents sales made pursuant to Issuer mandated sell-to-cover solely to satisfy tax withholding obligations.

3. Performance Share Units granted on September 11, 2023 vested and were settled in Ordinary Shares upon certification of the applicable performance conditions by the Compensation and People Committee.

Remarks:

	/s/ Louis J. Thorson, Attorney-in-Fact for William D. Mosley	09/16/2026
	** 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.
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.
* Form 4: SEC 1474 (03-26)