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

Seagate CEO Mosley (NASDAQ: STX) sells 20,000 shares via 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 selling a total of 20,000 Ordinary Shares on January 2, 2026 in a series of open-market transactions. The sales were executed at weighted average prices that, according to the footnotes, occurred in multiple trades within ranges from $280.66 to $289.25 per share.

The filing states that these transactions were carried out under a Rule 10b5-1 trading plan adopted by Mosley on February 20, 2025, which is a pre-arranged program for selling shares. Following these sales, Mosley beneficially owned 429,895 Ordinary Shares directly.

Positive

  • None.

Negative

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Insider MOSLEY WILLIAM D
Role CEO
Sold 20,000 shs ($5.71M)
Type Security Shares Price Value
Sale Ordinary Shares 800 $281.0939 $225K
Sale Ordinary Shares 2,000 $282.0863 $564K
Sale Ordinary Shares 1,600 $283.2211 $453K
Sale Ordinary Shares 1,800 $284.0845 $511K
Sale Ordinary Shares 2,705 $285.2311 $772K
Sale Ordinary Shares 3,586 $286.3231 $1.03M
Sale Ordinary Shares 5,009 $287.2739 $1.44M
Sale Ordinary Shares 2,100 $288.01 $605K
Sale Ordinary Shares 400 $289.0275 $116K
Holdings After Transaction: Ordinary Shares — 449,095 shares (Direct)
Footnotes (1)
  1. These Ordinary Shares were sold under a Rule 10b5-1 trading plan adopted by the Reporting Person February 20, 2025. These Ordinary Shares were sold in multiple trades at prices ranging from $280.66 to $281.52. 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. These Ordinary Shares were sold in multiple trades at prices ranging from $281.66 to $282.62. 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 $282.69 to $283.59. 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 $283.69 to $284.53. 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 $284.70 to $285.68. 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 $285.71 to $286.69. 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 $286.71 to $287.67. 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 $287.72 to $288.66. 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. These Ordinary Shares were sold in multiple trades at prices ranging from $288.74 to $289.25. 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.
Form 4 Insider Transactions: What Each Field Means →
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).
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 CA 94538
(City) (State) (Zip)
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
3. Date of Earliest Transaction (Month/Day/Year)
01/02/2026
4. If Amendment, Date of Original Filed (Month/Day/Year)
 6. Individual or Joint/Group Filing (Check Applicable Line)
X Form filed by One Reporting Person
Form filed by More than One Reporting Person
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 01/02/2026 S 800(1) D $281.0939(2) 449,095 D
Ordinary Shares 01/02/2026 S 2,000 D $282.0863(3) 447,095 D
Ordinary Shares 01/02/2026 S 1,600 D $283.2211(4) 445,495 D
Ordinary Shares 01/02/2026 S 1,800 D $284.0845(5) 443,695 D
Ordinary Shares 01/02/2026 S 2,705 D $285.2311(6) 440,990 D
Ordinary Shares 01/02/2026 S 3,586 D $286.3231(7) 437,404 D
Ordinary Shares 01/02/2026 S 5,009 D $287.2739(8) 432,395 D
Ordinary Shares 01/02/2026 S 2,100 D $288.01(9) 430,295 D
Ordinary Shares 01/02/2026 S 400 D $289.0275(10) 429,895 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
Explanation of Responses:
1. These Ordinary Shares were sold under a Rule 10b5-1 trading plan adopted by the Reporting Person February 20, 2025.
2. These Ordinary Shares were sold in multiple trades at prices ranging from $280.66 to $281.52. 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.
3. These Ordinary Shares were sold in multiple trades at prices ranging from $281.66 to $282.62. 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 $282.69 to $283.59. 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 $283.69 to $284.53. 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 $284.70 to $285.68. 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 $285.71 to $286.69. 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 $286.71 to $287.67. 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 $287.72 to $288.66. 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.
10. These Ordinary Shares were sold in multiple trades at prices ranging from $288.74 to $289.25. 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.
Remarks:
/s/ Louis J. Thorson, Attorney-in-Fact for William D. Mosley 01/06/2026
** 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.

Source: View Original Filing on SEC EDGAR

FAQ

What insider transaction did Seagate (STX) report in this Form 4?

The report shows CEO and director William D. Mosley sold a total of 20,000 Ordinary Shares of Seagate Technology Holdings plc on January 2, 2026 in multiple open-market transactions.

At what prices did Seagate CEO William D. Mosley sell his STX shares?

The Ordinary Shares were sold in multiple trades at weighted average prices within ranges from $280.66 to $289.25 per share, as detailed in the transaction footnotes.

Was the Seagate (STX) CEO’s stock sale made under a Rule 10b5-1 plan?

Yes. The filing states that the Ordinary Shares were sold under a Rule 10b5-1 trading plan adopted by William D. Mosley on February 20, 2025.

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

After completing the reported transactions, William D. Mosley beneficially owned 429,895 Ordinary Shares of Seagate Technology Holdings plc directly.

What role does William D. Mosley have at Seagate Technology Holdings plc?

According to the report, William D. Mosley is both a Director and an Officer of Seagate Technology Holdings plc, serving as CEO.

Were the Seagate CEO’s STX share sales executed in a single block or multiple trades?

The filing shows several transactions on January 2, 2026, each covering different share amounts. The footnotes explain that each reported price is a weighted average for multiple trades within the stated price ranges.