Seagate CEO sells 1,869.75 shares for taxes

Seagate’s CEO reported RSU vesting into shares followed by a tax-related sell-to-cover transaction.

Rhea-AI Filing Summary

Seagate Technology Holdings plc (STX) CEO and director William D. Mosley reported equity transactions involving ordinary shares and restricted share units. On September 11, 2026, 3,319 restricted share units were converted into 3,319 ordinary shares, and on September 14, 1,869.75 shares were sold in issuer-mandated sell-to-cover transactions 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 1,869.75 shs ($1.46M)

Approx. gross sale proceeds $1.46M

Approx. exercise cost $0.00

Type	Security	Shares	Price	Value
Sale	Ordinary Shares F1	1,869.75	$781.2254	$1.46M
Exercise	Restricted Share Unit F2	3,319	$0.00	$0.00
Exercise	Ordinary Shares	3,319	$0.00	$0.00

Holdings After Transaction: Restricted Share Unit — 13,276 contracts (Direct); Ordinary Shares — 298,997.5 shares (Direct)

Footnotes (2)

1. F1. Represents sales made pursuant to Issuer mandated sell-to-cover solely to satisfy tax withholding obligations.
2. F2. Consists of a grant of restricted share unit awarded to the reporting person under the Seagate Technology Holdings plc 2022 Equity Incentive Plan. One-quarter of the shares vested on September 11, 2024 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: 1,869.75 shares Sale price: $781.2254 per share RSUs converted: 3,319 restricted share units +2 more

5 metrics

Shares sold 1,869.75 shares Ordinary shares sold on September 14, 2026 in sell-to-cover transactions

Sale price $781.2254 per share Price for ordinary shares sold on September 14, 2026

RSUs converted 3,319 restricted share units RSUs converted into ordinary shares on September 11, 2026

Shares acquired from RSUs 3,319 ordinary shares Ordinary shares received upon RSU conversion on September 11, 2026

RSUs held after transaction 13,276 restricted share units Direct RSU holdings after the September 11, 2026 conversion

Key Terms

sell-to-cover, Restricted Share Unit, Equity Incentive Plan, vesting

4 terms

sell-to-cover financial

"Represents sales made pursuant to Issuer mandated sell-to-cover solely"

Sell-to-cover is when part of newly issued or exercised company stock is immediately sold to pay required taxes and fees, so the recipient keeps the remaining shares. For investors this matters because it reduces the number of shares insiders or employees actually hold after a grant, can create small, routine share sales that aren’t signal of cashing out, and slightly increases share supply on the market—like selling a portion of a paycheck to cover the tax bill.

Restricted Share Unit financial

"Consists of a grant of restricted share unit awarded to the reporting"

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

"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 financial

"One-quarter of the shares vested on September 11, 2024 and the"

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

FAQ

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

What equity transactions did STX’s CEO report in this Form 4?

The CEO reported 3,319 restricted share units converting into 3,319 ordinary shares on September 11, 2026, and a sale of 1,869.75 ordinary shares on September 14, 2026 in issuer-mandated sell-to-cover transactions for tax withholding.

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

The CEO sold 1,869.75 ordinary shares of Seagate at a price of $781.2254 per share on September 14, 2026. The related footnote states these were issuer-mandated sell-to-cover transactions solely to satisfy tax withholding obligations.

What RSU activity involving STX did the CEO report?

The CEO reported that 3,319 restricted share units converted into 3,319 ordinary shares on September 11, 2026 at an exercise price of $0.00 per share. The derivative line shows 13,276 restricted share units held after this transaction.

Were the STX share sales under a Rule 10b5-1 plan?

No. The filing’s Rule 10b5-1 checkbox is marked false, and the footnotes describe the September 14, 2026 sales as issuer-mandated sell-to-cover transactions for tax withholding, not as trades under a Rule 10b5-1 trading plan.

What is the vesting schedule of the CEO’s RSU grant at Seagate (STX)?

The RSU grant was awarded under the Seagate Technology Holdings plc 2022 Equity Incentive Plan. One-quarter vested on September 11, 2024, and the remaining portion vests in equal quarterly installments over the following three years, for a total vesting period of four years.

How many restricted share units does the STX CEO hold after the reported transaction?

After the RSU conversion reported for September 11, 2026, the CEO holds 13,276 restricted share units directly, according to the derivative transaction data in the Form 4 filing.

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

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Available on EDGAR 09/15/2026 - 04:16 PM Accepted by SEC EDGAR 09/15/2026 - 04:15 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)
09/11/2026

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	09/11/2026		M		3,319	A	$0	300,867.25	D
Ordinary Shares	09/14/2026		S		1,869.75(1)	D	$781.2254	298,997.5	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	09/11/2026		M			3,319	(2)	(2)	Ordinary Shares	3,319	$0	13,276	D

Explanation of Responses:

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

2. Consists of a grant of restricted share unit awarded to the reporting person under the Seagate Technology Holdings plc 2022 Equity Incentive Plan. One-quarter of the shares vested on September 11, 2024 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	09/15/2026
	** 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)