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Seagate Technology (STX) CEO sells 17,080 shares via Rule 10b5-1 plan

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

Rhea-AI Filing Summary

Seagate Technology Holdings plc CEO and director William D. Mosley reported sale transactions totaling 17,080 Ordinary Shares on August 3, 2026, across 19 trades at weighted-average prices between $818.84 and $837.99 per share. All transactions were executed under a Rule 10b5-1 trading plan adopted on February 18, 2026.

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Insider MOSLEY WILLIAM D
Role CEO
Sold 17,080 shs ($14.13M)
Type Security Shares Price Value
Sale Ordinary Shares F1, F2 400 $819.412 $328K
Sale Ordinary Shares F3 520 $820.3454 $427K
Sale Ordinary Shares F4 575 $821.4594 $472K
Sale Ordinary Shares F5 840 $822.5562 $691K
Sale Ordinary Shares F6 1,120 $823.4571 $922K
Sale Ordinary Shares F7 1,600 $824.5711 $1.32M
Sale Ordinary Shares F8 1,280 $825.6356 $1.06M
Sale Ordinary Shares F9 1,985 $826.7609 $1.64M
Sale Ordinary Shares F10 1,799 $827.6701 $1.49M
Sale Ordinary Shares F11 1,641 $828.5955 $1.36M
Sale Ordinary Shares F12 1,619 $829.7847 $1.34M
Sale Ordinary Shares F13 1,960 $830.8345 $1.63M
Sale Ordinary Shares F14 320 $832.0238 $266K
Sale Ordinary Shares F15 400 $832.7258 $333K
Sale Ordinary Shares F16 200 $833.9087 $167K
Sale Ordinary Shares F17 181 $835.0597 $151K
Sale Ordinary Shares F18 400 $835.989 $334K
Sale Ordinary Shares F19 160 $836.7675 $134K
Sale Ordinary Shares F20 80 $837.98 $67K
Holdings After Transaction: Ordinary Shares — 295,517 shares (Direct)
Footnotes (20)
  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 $818.84 to $819.71. 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 $819.89 to $820.88. 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 $820.99 to $821.98. 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 $822.01 to $822.97. 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 $823.085 to $824.07. 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.
  7. F7. These Ordinary Shares were sold in multiple trades at prices ranging from $824.15 to $825.11. 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 $825.16 to $826.15. 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 $826.19 to $827.18. 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.
  10. F10. These Ordinary Shares were sold in multiple trades at prices ranging from $827.20 to $828.19. 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.
  11. F11. These Ordinary Shares were sold in multiple trades at prices ranging from $828.22 to $829.16. 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 $829.33 to $830.31. 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 $830.33 to $831.27. 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 $831.43 to $832.31. 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 $832.43 to $833.40. 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 $833.43 to $834.36. 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 $834.46 to $835.37. 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 $835.55 to $836.52. 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 $836.58 to $837.21. 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.
  20. F20. These Ordinary Shares were sold in multiple trades at prices ranging from $837.97 to $837.99. 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.
Shares sold 17,080 Ordinary Shares Aggregate shares sold by William D. Mosley on August 3, 2026 across all reported transactions
Number of sale transactions 19 Count of separate sale transactions reported for August 3, 2026
Lowest reported price range $818.84 to $819.71 per share Price range for one tranche of Ordinary Share sales described in footnote F2
Highest reported price range $837.97 to $837.99 per share Price range for the final tranche of Ordinary Share sales described in footnote F20
Example weighted average price $819.4120 per share Weighted average sale price for a 400-share transaction on August 3, 2026
Trading plan adoption date February 18, 2026 Date the Rule 10b5-1 trading plan governing these transactions was adopted
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.

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

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FAQ

What insider transaction did STX report for CEO William D. Mosley?
Seagate reported that CEO William D. Mosley sold 17,080 Ordinary Shares on August 3, 2026. The sales occurred in 19 separate transactions at weighted-average prices between $818.84 and $837.99 per share under a Rule 10b5-1 trading plan.

How many Seagate (STX) shares did the CEO sell in this Form 4?
The Form 4 shows that CEO William D. Mosley sold a total of 17,080 Ordinary Shares. This aggregate volume comes from 19 individual sale transactions reported for August 3, 2026, as summarized in the filing’s transaction overview section.

Over what price range were STX shares sold by the CEO?
Footnotes state the sales occurred in ranges from $818.84 to $837.99 per share. Each line item’s reported price is a weighted average sale price for multiple trades executed within its specific price interval on August 3, 2026.

Were the STX CEO’s share sales made under a Rule 10b5-1 plan?
Yes. A footnote explains that all transactions reported were effected under a Rule 10b5-1 trading plan. The plan was adopted by William D. Mosley on February 18, 2026, and the filing’s Rule 10b5-1 checkbox is marked as affirmative.

What type of security did the STX CEO sell in these transactions?
All reported transactions involve Ordinary Shares of Seagate Technology Holdings plc. Each of the 19 sale entries on August 3, 2026, lists “Ordinary Shares” as the security title and reflects a weighted-average price for the shares sold in that tranche.
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)
08/03/2026		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 Shares08/03/2026S400(1)D$819.412(2)312,197D
Ordinary Shares08/03/2026S520D$820.3454(3)311,677D
Ordinary Shares08/03/2026S575D$821.4594(4)311,102D
Ordinary Shares08/03/2026S840D$822.5562(5)310,262D
Ordinary Shares08/03/2026S1,120D$823.4571(6)309,142D
Ordinary Shares08/03/2026S1,600D$824.5711(7)307,542D
Ordinary Shares08/03/2026S1,280D$825.6356(8)306,262D
Ordinary Shares08/03/2026S1,985D$826.7609(9)304,277D
Ordinary Shares08/03/2026S1,799D$827.6701(10)302,478D
Ordinary Shares08/03/2026S1,641D$828.5955(11)300,837D
Ordinary Shares08/03/2026S1,619D$829.7847(12)299,218D
Ordinary Shares08/03/2026S1,960D$830.8345(13)297,258D
Ordinary Shares08/03/2026S320D$832.0238(14)296,938D
Ordinary Shares08/03/2026S400D$832.7258(15)296,538D
Ordinary Shares08/03/2026S200D$833.9087(16)296,338D
Ordinary Shares08/03/2026S181D$835.0597(17)296,157D
Ordinary Shares08/03/2026S400D$835.989(18)295,757D
Ordinary Shares08/03/2026S160D$836.7675(19)295,597D
Ordinary Shares08/03/2026S80D$837.98(20)295,517D
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
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 $818.84 to $819.71. 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 $819.89 to $820.88. 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 $820.99 to $821.98. 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 $822.01 to $822.97. 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 $823.085 to $824.07. 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.
7. These Ordinary Shares were sold in multiple trades at prices ranging from $824.15 to $825.11. 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 $825.16 to $826.15. 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 $826.19 to $827.18. 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.
10. These Ordinary Shares were sold in multiple trades at prices ranging from $827.20 to $828.19. 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.
11. These Ordinary Shares were sold in multiple trades at prices ranging from $828.22 to $829.16. 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 $829.33 to $830.31. 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 $830.33 to $831.27. 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 $831.43 to $832.31. 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 $832.43 to $833.40. 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 $833.43 to $834.36. 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 $834.46 to $835.37. 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 $835.55 to $836.52. 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 $836.58 to $837.21. 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.
20. These Ordinary Shares were sold in multiple trades at prices ranging from $837.97 to $837.99. 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. Mosley08/04/2026
** 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