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  4. [Form 4] Seagate Technology Holdings plc Insider Trading Activity

Seagate (STX) CEO sells 1,768 shares after RSU vesting, keeps large stake

Filing Impact
(Very High)
Filing Sentiment
(Negative)
Form Type
4

Rhea-AI Filing Summary

Seagate Technology Holdings plc CEO William D. Mosley reported an open-market sale and related equity award vesting in the company’s ordinary shares. On June 12, 2026, he sold 1,768.25 ordinary shares at an average price of $880.1888 per share.

These shares came from the June 11, 2026 vesting and conversion of 3,319 restricted share units granted under Seagate’s 2022 Equity Incentive Plan. After these transactions, Mosley holds 327,517 ordinary shares directly and 16,595 restricted share units, indicating he retained a substantial equity position alongside the partial sale.

Positive

  • None.

Negative

  • None.
Insider MOSLEY WILLIAM D
Role CEO
Sold 1,768.25 shs ($1.56M)
Type Security Shares Price Value
Sale Ordinary Shares 1,768.25 $880.1888 $1.56M
Exercise Restricted Share Unit 3,319 $0.00 --
Exercise Ordinary Shares 3,319 $0.00 --
Holdings After Transaction: Ordinary Shares — 327,517 shares (Direct, null); Restricted Share Unit — 16,595 shares (Direct, null)
Footnotes (1)
  1. [object Object]
Shares sold 1,768.25 shares Open-market sale on June 12, 2026
Sale price $880.1888 per share Average price for June 12, 2026 sale
Shares after sale 327,517 shares Ordinary shares directly owned post-transaction
RSUs converted 3,319 units Restricted share units converted to ordinary shares on June 11, 2026
RSUs remaining 16,595 units Restricted share units held after June 11, 2026
Net share change (buy/sell) -1,768.25 shares Net sell direction from transaction summary
Restricted Share Unit financial
"Consists of a grant of restricted share unit 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
"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.
open-market sale financial
"transaction_action": "open-market sale""
An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.
derivative security financial
"transaction_code_description": "Exercise or conversion of derivative security""
A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.
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Form 4 Insider Transactions: What Each Field Means →
SEC Form 4
FORM 4UNITED 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)
XDirector10% Owner
XOfficer (give title below)Other (specify below)
CEO
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
06/11/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Ordinary Shares06/11/2026M3,319A$0329,285.25D
Ordinary Shares06/12/2026S1,768.25D$880.1888327,517D
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Restricted Share Unit$006/11/2026M3,319 (1) (1)Ordinary Shares3,319$016,595D
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. Mosley06/15/2026
** Signature of Reporting PersonDate
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)

Source: View Original Filing on SEC EDGAR

FAQ

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

William D. Mosley reported an open-market sale of 1,768.25 ordinary shares and the vesting and conversion of 3,319 restricted share units into ordinary shares, all occurring on June 11–12, 2026, under Seagate’s 2022 Equity Incentive Plan.

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

On June 12, 2026, the CEO sold 1,768.25 Seagate ordinary shares at an average price of $880.1888 per share. This transaction was reported as an open-market sale and followed the vesting of related restricted share units the previous day.

What equity awards vested for the Seagate (STX) CEO in this Form 4 filing?

3,319 restricted share units vested and were converted into Seagate ordinary shares for the CEO on June 11, 2026. These units were granted under the Seagate Technology Holdings plc 2022 Equity Incentive Plan with a four-year vesting schedule in quarterly installments.

What are William D. Mosley’s Seagate (STX) holdings after these transactions?

Following the reported transactions, William D. Mosley directly holds 327,517 Seagate ordinary shares and 16,595 restricted share units. These figures from the Form 4 show he maintains a sizable ongoing equity stake in the company after the partial sale.

Is the Seagate (STX) CEO’s share sale linked to a compensation plan?

Yes. The shares sold stem from restricted share units granted under Seagate’s 2022 Equity Incentive Plan. One-quarter of the award vested starting on September 11, 2024, with additional equal quarterly vesting over three years, forming a four-year compensation schedule.