Seagate CEO sells 2,849 shares after RSU exercise

Seagate’s CEO exercised RSUs into shares, then sold about 2,849 Ordinary Shares in market transactions at roughly $862 per share.

Rhea-AI Filing Summary

Seagate Technology Holdings plc (STX) CEO and director William D. Mosley reported transactions involving company equity. On September 9, 2026 he exercised 5,230 Restricted Share Units into Ordinary Shares at a conversion price of $0.00 per share, tied to prior RSU grants under equity incentive plans. On September 10, 2026 he then sold an aggregate 2,849.25 Ordinary Shares in open-market or private transactions at prices around $862.13 per share, resulting in a net reported share disposition for this filing.

Insider Trade Summary

Exercise and sale activity reported; no spread calculated

Exercise and Sale 6 txns

Insider MOSLEY WILLIAM D

Role CEO

Sold 2,849.25 shs ($2.46M)

Approx. gross sale proceeds $2.46M

Approx. exercise cost $0.00

Type	Security	Shares	Price	Value
Sale	Ordinary Shares	1,533.5	$862.1337	$1.32M
Sale	Ordinary Shares	1,315.75	$862.1351	$1.13M
Exercise	Restricted Share Unit F1	2,815	$0.00	$0.00
Exercise	Restricted Share Unit F2	2,415	$0.00	$0.00
Exercise	Ordinary Shares	2,815	$0.00	$0.00
Exercise	Ordinary Shares	2,415	$0.00	$0.00

Holdings After Transaction: Restricted Share Unit — 19,328 contracts (Direct); Ordinary Shares — 297,548.25 shares (Direct)

Footnotes (2)

1. F1. Consists of a grant of RSUs awarded to the Reporting Person under the Seagate Technology Holdings plc 2022 Equity Incentive Plan (the "2022 Plan"). One-quarter of the shares vested on September 9, 2023 and the remaining portion vested in equal quarterly installments over the following three years for a total vesting period of four years.
2. F2. Consists of a grant of RSUs awarded to the Reporting Person under the Plan. One-quarter of the shares 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.

Key Figures

Shares sold at $862.1337: 1,533.5 shares Shares sold at $862.1351: 1,315.75 shares Total shares sold: 2,849.25 shares +4 more

7 metrics

Shares sold at $862.1337 1,533.5 shares Ordinary Shares sold on September 10, 2026

Shares sold at $862.1351 1,315.75 shares Ordinary Shares sold on September 10, 2026

Total shares sold 2,849.25 shares Aggregate Ordinary Shares sold across two transactions on September 10, 2026

RSUs exercised (first grant) 2,815 RSUs Restricted Share Units converted into Ordinary Shares on September 9, 2026

RSUs exercised (second grant) 2,415 RSUs Restricted Share Units converted into Ordinary Shares on September 9, 2026

Total RSUs exercised 5,230 RSUs Sum of RSUs converted to Ordinary Shares on September 9, 2026

RSU conversion price $0.00 per share Conversion or exercise price for RSUs exercised into Ordinary Shares

Key Terms

Restricted Share Unit, Equity Incentive Plan, vesting period

3 terms

Restricted Share Unit financial

"Consists of a grant of RSUs awarded to the Reporting Person under the Seagate Technology Holdings plc 2022 Equity Incentive Plan"

A restricted share unit (RSU) is a promise by a company to give an employee a set number of company shares at a future date, typically after meeting time or performance conditions. For investors, RSUs matter because when they convert into actual shares they increase the number of shares outstanding (like unlocking more tickets in a game), which can dilute existing holders, and they align employee incentives with company performance, influencing behavior and long-term value.

Equity Incentive Plan financial

"grant of RSUs awarded to the Reporting Person under the Seagate Technology Holdings plc 2022 Equity Incentive Plan"

An equity incentive plan is a program that gives employees, executives or directors the right to receive company stock or options to buy stock as part of their pay. Think of it as offering slices of future company profit to motivate people to boost long‑term performance; for investors it matters because it can align employee goals with shareholder value but also increases the number of shares outstanding, which can dilute existing ownership.

vesting period financial

"the remaining portion vested in equal quarterly installments over the following three years for a total vesting period of four years"

A vesting period is the set amount of time someone must wait before they fully own granted shares, stock options, or other equity tied to their work or an agreement; ownership increases gradually or in steps during that time. Investors care because vesting determines when insiders or employees can sell shares, which affects future supply of stock, company incentives and executive retention—think of it like unlocking ownership over installments rather than receiving it all at once.

FAQ

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

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

The CEO reported exercising 5,230 Restricted Share Units into Ordinary Shares on September 9, 2026, then selling an aggregate 2,849.25 Ordinary Shares on September 10, 2026 in open-market or private transactions.

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

William D. Mosley sold 1,533.5 Ordinary Shares at $862.1337 per share and 1,315.75 Ordinary Shares at $862.1351 per share on September 10, 2026, for a total of 2,849.25 shares sold.

What RSU exercises did the Seagate (STX) CEO report?

On September 9, 2026, the CEO exercised 2,815 RSUs and 2,415 RSUs, converting them into a total of 5,230 Ordinary Shares at a conversion price of $0.00 per share.

Under which plans were the Seagate (STX) CEO’s RSUs granted and how do they vest?

One RSU grant was awarded under the Seagate Technology Holdings plc 2022 Equity Incentive Plan, vesting one-quarter on September 9, 2023 with the rest in equal quarterly installments over three years. Another grant vests one-quarter on September 9, 2025, then quarterly over the next three years.

Were the Seagate (STX) CEO’s transactions made under a Rule 10b5-1 trading plan?

The filing indicates no Rule 10b5-1 trading plan checkbox was marked for these transactions, so there is no document-level affirmation that they were made pursuant to a Rule 10b5-1 plan.

What is the net effect of the reported Form 4 transactions for Seagate (STX) CEO holdings?

Within this Form 4, the CEO exercised 5,230 RSUs into Ordinary Shares and sold 2,849.25 shares, representing a net reported disposition of 2,849.25 shares relative to buy/sell activity; post-transaction share balances are not stated in the data provided.

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

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Available on EDGAR 09/11/2026 - 04:47 PM Accepted by SEC EDGAR 09/11/2026 - 04:46 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)
09/09/2026

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	09/09/2026		M		2,815	A	$0	297,982.5	D
Ordinary Shares	09/10/2026		S		1,533.5	D	$862.1337	296,449	D
Ordinary Shares	09/09/2026		M		2,415	A	$0	298,864	D
Ordinary Shares	09/10/2026		S		1,315.75	D	$862.1351	297,548.25	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
Restricted Share Unit	$0	09/09/2026		M			2,815	(1)	(1)	Ordinary Shares	2,815	$0	0	D
Restricted Share Unit	$0	09/09/2026		M			2,415	(2)	(2)	Ordinary Shares	2,415	$0	19,328	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"). One-quarter of the shares vested on September 9, 2023 and the remaining portion vested 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 Plan. One-quarter of the shares 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	09/11/2026
	** 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)