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Seagate Technology Holdings plc (STX) CEO sells 13,780 shares in Rule 10b5-1 plan

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

Rhea-AI Filing Summary

Seagate Technology Holdings plc reports that CEO William D. Mosley sold a total of 13,780 Ordinary Shares on June 1, 2026 in 20 open-market or private transactions at weighted-average prices between approximately $916.34 and $940.07 per share, pursuant to a Rule 10b5-1 trading plan adopted on February 18, 2026. Following these sales, he directly holds 323,591 Ordinary Shares.

Positive

  • None.

Negative

  • None.

Insights

Pre-planned CEO sales of 13,780 shares look routine in scale.

CEO William D. Mosley sold 13,780 Ordinary Shares of Seagate Technology Holdings plc in 20 open-market transactions on June 1, 2026. All trades were executed under a Rule 10b5-1 trading plan adopted on February 18, 2026, signaling they were pre-arranged.

Sale prices ranged from $916.34 to $940.07 per share, reported as weighted averages for multiple trades within each range. After these disposals, Mosley still directly owns 337,051 Ordinary Shares, suggesting the transactions represent a modest portion of his visible holdings.

The filing shows no option exercises or derivative activity; derivativeSummary is empty. Overall, this appears to be routine, pre-planned diversification rather than a thesis-changing move, and its impact depends largely on broader company performance disclosed in future filings.

Insider MOSLEY WILLIAM D
Role CEO
Sold 13,780 shs ($12.75M)
Type Security Shares Price Value
Sale Ordinary Shares 320 $916.775 $293K
Sale Ordinary Shares 480 $918.7488 $441K
Sale Ordinary Shares 1,691 $919.6229 $1.56M
Sale Ordinary Shares 1,730 $920.9012 $1.59M
Sale Ordinary Shares 1,807 $921.7474 $1.67M
Sale Ordinary Shares 1,598 $922.9496 $1.47M
Sale Ordinary Shares 480 $923.5783 $443K
Sale Ordinary Shares 360 $924.8844 $333K
Sale Ordinary Shares 871 $925.8728 $806K
Sale Ordinary Shares 320 $926.83 $297K
Sale Ordinary Shares 320 $928.2125 $297K
Sale Ordinary Shares 1,480 $929.3797 $1.38M
Sale Ordinary Shares 240 $930.1233 $223K
Sale Ordinary Shares 200 $931.646 $186K
Sale Ordinary Shares 415 $933.25 $387K
Sale Ordinary Shares 440 $934.1709 $411K
Sale Ordinary Shares 320 $935.4413 $299K
Sale Ordinary Shares 355 $937.3861 $333K
Sale Ordinary Shares 273 $938.8178 $256K
Sale Ordinary Shares 80 $939.995 $75K
Holdings After Transaction: Ordinary Shares — 323,591 shares (Direct)
Footnotes (21)
  1. F1. All transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 18, 2026.
  2. F2. These Ordinary Shares were sold in multiple trades at prices ranging from $916.34 to $917.19. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
  3. F3. These Ordinary Shares were sold in multiple trades at prices ranging from $918.07 to $919.05. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
  4. F4. These Ordinary Shares were sold in multiple trades at prices ranging from $919.24 to $920.21. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
  5. F5. These Ordinary Shares were sold in multiple trades at prices ranging from $920.26 to $921.25. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
  6. F6. These Ordinary Shares were sold in multiple trades at prices ranging from $921.33 to $922.32. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
  7. F7. These Ordinary Shares were sold in multiple trades at prices ranging from $922.39 to $923.38. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
  8. F8. These Ordinary Shares were sold in multiple trades at prices ranging from $923.39 to $923.92. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
  9. F9. These Ordinary Shares were sold in multiple trades at prices ranging from $924.39 to $925.33. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
  10. F10. These Ordinary Shares were sold in multiple trades at prices ranging from $925.39 to $926.38. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
  11. F11. These Ordinary Shares were sold in multiple trades at prices ranging from $926.39 to $927.19. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
  12. F12. These Ordinary Shares were sold in multiple trades at prices ranging from $927.63 to $928.56. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
  13. F13. These Ordinary Shares were sold in multiple trades at prices ranging from $928.88 to $929.83. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
  14. F14. These Ordinary Shares were sold in multiple trades at prices ranging from $929.90 to $930.47. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
  15. F15. These Ordinary Shares were sold in multiple trades at prices ranging from $931.53 to $931.85. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
  16. F16. These Ordinary Shares were sold in multiple trades at prices ranging from $932.70 to $933.66. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
  17. F17. These Ordinary Shares were sold in multiple trades at prices ranging from $933.99 to $934.50. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
  18. F18. These Ordinary Shares were sold in multiple trades at prices ranging from $935.19 to $935.81. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
  19. F19. These Ordinary Shares were sold in multiple trades at prices ranging from $937.08 to $937.64. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
  20. F20. These Ordinary Shares were sold in multiple trades at prices ranging from $938.43 to $939.18. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
  21. F21. These Ordinary Shares were sold in multiple trades at prices ranging from $939.92 to $940.07. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
Total shares sold 13,780 shares Non-derivative Ordinary Shares sold on 2026-06-01 by the CEO
Number of sale transactions 20 Individual non-derivative sale entries reported for June 1, 2026
Sale price range $916.34–$940.07 per share Price bands across multiple trades, as detailed in footnotes F2–F21
Post-transaction holdings 323,591 shares Direct Ordinary Shares held by CEO William D. Mosley after the reported sales
Rule 10b5-1 plan adoption date February 18, 2026 Date the CEO adopted the trading plan governing these transactions
Rule 10b5-1 trading plan regulatory
"All transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan"
A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.
weighted average sale price financial
"The price reported above reflects the weighted average sale price"
Ordinary Shares financial
"These Ordinary Shares were sold in multiple trades at prices ranging"
Ordinary shares are a type of ownership stake in a company, giving shareholders a right to participate in the company’s profits and decision-making through voting. They are similar to owning a piece of a business, and their value can rise or fall based on the company's performance. Investors buy ordinary shares to potentially earn dividends and benefit from the company's growth over time.
open market or private transaction financial
"Sale in open market or private transaction"

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FAQ

What insider transaction did Seagate (STX) disclose in this Form 4?
Seagate disclosed that CEO William D. Mosley sold 13,780 Ordinary Shares on June 1, 2026. The sales were executed in 20 non-derivative transactions and reported as open-market or private sales under a Rule 10b5-1 trading plan.

At what prices did the Seagate (STX) CEO sell his shares?
The CEO’s Ordinary Shares were sold at weighted-average prices ranging from about $916.34 to $940.07 per share. Footnotes state the shares were executed in multiple trades within narrow price bands, with the reported prices reflecting weighted averages for each group of trades.

How many Seagate (STX) shares does CEO William Mosley still own after these sales?
After the reported transactions, CEO William D. Mosley directly holds 323,591 Ordinary Shares of Seagate. This post-transaction holding reflects his remaining direct equity position following the June 1, 2026 open-market or private sales disclosed in the Form 4.

Were the Seagate (STX) insider sales made under a Rule 10b5-1 plan?
Yes. The company reports that all transactions in this Form 4 were effected under a Rule 10b5-1 trading plan adopted by CEO William D. Mosley on February 18, 2026, indicating the sales followed a pre-established, SEC-recognized trading arrangement.

How many individual transactions were included in Seagate’s (STX) Form 4 filing?
The Form 4 lists 20 separate non-derivative sale transactions, all dated June 1, 2026. Together, these open-market or private sales account for the 13,780 Ordinary Shares reported as sold by CEO William D. Mosley under his Rule 10b5-1 trading plan.
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).
X
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)
06/01/2026		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 Shares06/01/2026S320(1)D$916.775(2)337,051D
Ordinary Shares06/01/2026S480D$918.7488(3)336,571D
Ordinary Shares06/01/2026S1,691D$919.6229(4)334,880D
Ordinary Shares06/01/2026S1,730D$920.9012(5)333,150D
Ordinary Shares06/01/2026S1,807D$921.7474(6)331,343D
Ordinary Shares06/01/2026S1,598D$922.9496(7)329,745D
Ordinary Shares06/01/2026S480D$923.5783(8)329,265D
Ordinary Shares06/01/2026S360D$924.8844(9)328,905D
Ordinary Shares06/01/2026S871D$925.8728(10)328,034D
Ordinary Shares06/01/2026S320D$926.83(11)327,714D
Ordinary Shares06/01/2026S320D$928.2125(12)327,394D
Ordinary Shares06/01/2026S1,480D$929.3797(13)325,914D
Ordinary Shares06/01/2026S240D$930.1233(14)325,674D
Ordinary Shares06/01/2026S200D$931.646(15)325,474D
Ordinary Shares06/01/2026S415D$933.25(16)325,059D
Ordinary Shares06/01/2026S440D$934.1709(17)324,619D
Ordinary Shares06/01/2026S320D$935.4413(18)324,299D
Ordinary Shares06/01/2026S355D$937.3861(19)323,944D
Ordinary Shares06/01/2026S273D$938.8178(20)323,671D
Ordinary Shares06/01/2026S80D$939.995(21)323,591D
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
Explanation of Responses:
1. All transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 18, 2026.
2. These Ordinary Shares were sold in multiple trades at prices ranging from $916.34 to $917.19. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
3. These Ordinary Shares were sold in multiple trades at prices ranging from $918.07 to $919.05. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
4. These Ordinary Shares were sold in multiple trades at prices ranging from $919.24 to $920.21. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
5. These Ordinary Shares were sold in multiple trades at prices ranging from $920.26 to $921.25. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
6. These Ordinary Shares were sold in multiple trades at prices ranging from $921.33 to $922.32. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
7. These Ordinary Shares were sold in multiple trades at prices ranging from $922.39 to $923.38. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
8. These Ordinary Shares were sold in multiple trades at prices ranging from $923.39 to $923.92. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
9. These Ordinary Shares were sold in multiple trades at prices ranging from $924.39 to $925.33. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
10. These Ordinary Shares were sold in multiple trades at prices ranging from $925.39 to $926.38. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
11. These Ordinary Shares were sold in multiple trades at prices ranging from $926.39 to $927.19. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
12. These Ordinary Shares were sold in multiple trades at prices ranging from $927.63 to $928.56. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
13. These Ordinary Shares were sold in multiple trades at prices ranging from $928.88 to $929.83. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
14. These Ordinary Shares were sold in multiple trades at prices ranging from $929.90 to $930.47. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
15. These Ordinary Shares were sold in multiple trades at prices ranging from $931.53 to $931.85. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
16. These Ordinary Shares were sold in multiple trades at prices ranging from $932.70 to $933.66. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
17. These Ordinary Shares were sold in multiple trades at prices ranging from $933.99 to $934.50. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
18. These Ordinary Shares were sold in multiple trades at prices ranging from $935.19 to $935.81. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
19. These Ordinary Shares were sold in multiple trades at prices ranging from $937.08 to $937.64. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
20. These Ordinary Shares were sold in multiple trades at prices ranging from $938.43 to $939.18. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
21. These Ordinary Shares were sold in multiple trades at prices ranging from $939.92 to $940.07. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
Remarks:
/s/ Louis J. Thorson, Attorney-in-Fact for William D. Mosley06/02/2026
** 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