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Seagate (STX) CEO Mosley sells 9,343 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 William D. Mosley reported selling 9,343 Ordinary Shares of STX in open-market transactions. The sales occurred on July 1, 2026 at prices referenced as weighted averages for ranges between $919.19 and $934.61, according to the footnotes.

All transactions were carried out under a pre-arranged Rule 10b5-1 trading plan adopted on February 18, 2026, indicating they were scheduled in advance. Following the reported trades, Mosley directly held 319,380 Ordinary Shares of Seagate.

Positive

  • None.

Negative

  • None.

Insights

CEO’s 9,343-share sale is pre-planned and small versus remaining holdings.

CEO William D. Mosley executed open-market sales totaling 9,343 Ordinary Shares of Seagate Technology Holdings plc on July 1, 2026. All 15 transactions are coded "S" for open-market sales, with no derivative exercises or tax withholdings reported.

The filing states that every trade was made under a Rule 10b5-1 trading plan adopted on February 18, 2026, signaling the timing was pre-scheduled rather than opportunistic. After these trades, Mosley still directly owns 319,380 shares, so the net sale represents a small fraction of his visible stake in this filing.

The prices are reported as weighted averages over narrow ranges from about $919.19 to $934.61, reflecting execution across multiple trades. The routine, pre-planned nature and modest proportion of shares sold suggest limited informational value beyond confirming ongoing portfolio diversification.

Insider MOSLEY WILLIAM D
Role CEO
Sold 9,343 shs ($8.64M)
Type Security Shares Price Value
Sale Ordinary Shares 1,480 $919.6414 $1.36M
Sale Ordinary Shares 880 $920.5713 $810K
Sale Ordinary Shares 880 $921.8045 $811K
Sale Ordinary Shares 720 $922.6828 $664K
Sale Ordinary Shares 1,160 $923.832 $1.07M
Sale Ordinary Shares 770 $925.0257 $712K
Sale Ordinary Shares 1,019 $926.1676 $944K
Sale Ordinary Shares 571 $926.9989 $529K
Sale Ordinary Shares 620 $928.0977 $575K
Sale Ordinary Shares 320 $929.105 $297K
Sale Ordinary Shares 280 $930.0957 $260K
Sale Ordinary Shares 120 $931.6167 $112K
Sale Ordinary Shares 320 $932.9413 $299K
Sale Ordinary Shares 200 $934.452 $187K
Sale Ordinary Shares 3 $936.36 $3K
Holdings After Transaction: Ordinary Shares — 319,380 shares (Direct, null)
Footnotes (1)
  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. These Ordinary Shares were sold in multiple trades at prices ranging from $919.19 to $920.18. 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. These Ordinary Shares were sold in multiple trades at prices ranging from $920.19 to $921.18. 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. These Ordinary Shares were sold in multiple trades at prices ranging from $921.20 to $922.19. 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. These Ordinary Shares were sold in multiple trades at prices ranging from $922.30 to $923.27. 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. These Ordinary Shares were sold in multiple trades at prices ranging from $923.45 to $924.44. 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. These Ordinary Shares were sold in multiple trades at prices ranging from $924.54 to $925.51. 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. These Ordinary Shares were sold in multiple trades at prices ranging from $925.54 to $926.51. 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. These Ordinary Shares were sold in multiple trades at prices ranging from $926.54 to $927.43. 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. These Ordinary Shares were sold in multiple trades at prices ranging from $927.61 to $928.33. 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. These Ordinary Shares were sold in multiple trades at prices ranging from $928.63 to $929.22. 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. These Ordinary Shares were sold in multiple trades at prices ranging from $929.67 to $930.23. 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. These Ordinary Shares were sold in multiple trades at prices ranging from $931.21 to $931.83. 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. These Ordinary Shares were sold in multiple trades at prices ranging from $932.65 to $933.54. 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. These Ordinary Shares were sold in multiple trades at prices ranging from $934.30 to $934.61. 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 9,343 shares Total Ordinary Shares sold on July 1, 2026
Post-transaction holdings 319,380 shares CEO William D. Mosley direct ownership after sales
Highest listed sale price $936.36 per share Price for a 3-share sale of Ordinary Shares
Lowest price range in footnotes $919.19–$920.18 Range for one weighted-average sale group
Number of sale transactions 15 entries Non-derivative open-market sales coded "S"
Trading plan adoption date February 18, 2026 Date CEO adopted Rule 10b5-1 trading plan
Rule 10b5-1 trading plan regulatory
"All transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person"
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 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.
non-derivative financial
"transaction_type": "non-derivative""
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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).
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)
07/01/2026		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 Shares07/01/2026S1,480(1)D$919.6414(2)319,380D
Ordinary Shares07/01/2026S880D$920.5713(3)318,500D
Ordinary Shares07/01/2026S880D$921.8045(4)317,620D
Ordinary Shares07/01/2026S720D$922.6828(5)316,900D
Ordinary Shares07/01/2026S1,160D$923.832(6)315,740D
Ordinary Shares07/01/2026S770D$925.0257(7)314,970D
Ordinary Shares07/01/2026S1,019D$926.1676(8)313,951D
Ordinary Shares07/01/2026S571D$926.9989(9)313,380D
Ordinary Shares07/01/2026S620D$928.0977(10)312,760D
Ordinary Shares07/01/2026S320D$929.105(11)312,440D
Ordinary Shares07/01/2026S280D$930.0957(12)312,160D
Ordinary Shares07/01/2026S120D$931.6167(13)312,040D
Ordinary Shares07/01/2026S320D$932.9413(14)311,720D
Ordinary Shares07/01/2026S200D$934.452(15)311,520D
Ordinary Shares07/01/2026S3D$936.36311,517D
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 $919.19 to $920.18. 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.
3. These Ordinary Shares were sold in multiple trades at prices ranging from $920.19 to $921.18. 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.
4. These Ordinary Shares were sold in multiple trades at prices ranging from $921.20 to $922.19. 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.
5. These Ordinary Shares were sold in multiple trades at prices ranging from $922.30 to $923.27. 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.
6. These Ordinary Shares were sold in multiple trades at prices ranging from $923.45 to $924.44. 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 $924.54 to $925.51. 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 $925.54 to $926.51. 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 $926.54 to $927.43. 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 $927.61 to $928.33. 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.
11. These Ordinary Shares were sold in multiple trades at prices ranging from $928.63 to $929.22. 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 $929.67 to $930.23. 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 $931.21 to $931.83. 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 $932.65 to $933.54. 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 $934.30 to $934.61. 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. Mosley07/02/2026
** 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

FAQ

What did Seagate (STX) CEO William D. Mosley report in this Form 4?

He reported selling 9,343 Ordinary Shares of Seagate in open-market transactions on July 1, 2026. The sales were broken into 15 separate trades, each recorded as a non-derivative sale of Ordinary Shares at different weighted-average prices.

At what prices did the Seagate (STX) CEO’s July 1, 2026 share sales occur?

The filing shows weighted-average sale prices with trade ranges between about $919.19 and $934.61. Each price per share reflects the average for multiple trades within a narrow band, as explained in the detailed transaction footnotes attached to the filing.

How many Seagate (STX) shares does CEO William D. Mosley hold after these sales?

Following the reported transactions, William D. Mosley directly holds 319,380 Ordinary Shares of Seagate. This post-transaction figure comes from the holdings column associated with the final listed sale and indicates his remaining direct ownership stake after the July 1, 2026 trades.

Were the Seagate (STX) CEO’s July 1, 2026 sales made under a Rule 10b5-1 plan?

Yes. The footnotes state that all transactions on this Form 4 were executed under a Rule 10b5-1 trading plan adopted on February 18, 2026. Such plans pre-schedule trades, reducing the significance of trade timing as a signal of management’s short-term outlook.

What type of transactions are reported for Seagate (STX) CEO Mosley in this Form 4?

All reported entries are non-derivative open-market sales of Ordinary Shares, coded "S". There are no option exercises, conversions, tax-withholding dispositions, or gifts disclosed in this filing, and the derivative section shows no remaining derivative positions in this particular report.

How many individual trades make up the Seagate (STX) CEO’s 9,343-share sale?

The Form 4 lists 15 separate sale entries, each with its own share amount and weighted-average price per share. Together, these transactions sum to 9,343 shares sold, as reflected in the transaction summary’s total sell-share figure for the reporting date.