Were the Seagate (STX) CEO share sales made under a Rule 10b5-1 plan?

Yes. The Form 4 states all transactions were effected under a Rule 10b5-1 trading plan adopted on February 20, 2025. Such plans pre-schedule trades, indicating the sale timing was set in advance rather than based on day-to-day market conditions.

Seagate (STX) CEO Mosley sells 20,000 shares in 10b5-1 trades

Q: How many Seagate (STX) shares did CEO William Mosley sell in this Form 4?

CEO William D. Mosley sold 20,000 Seagate Ordinary Shares in total, spread across 21 open-market transactions on April 1, 2026. The trades involved only non-derivative stock, reflecting a series of planned sales rather than option exercises.

Q: What type of transactions are reported in this Seagate (STX) Form 4?

The filing reports only non-derivative open-market sales of Seagate Ordinary Shares, coded as “S” transactions. There are no option exercises, gifts, or tax-withholding entries, and the derivative position summary is empty in this particular disclosure.

Q: How many individual trades did the Seagate (STX) CEO execute in this sale program?

The Form 4 shows 21 separate sale transactions on April 1, 2026. Each line reflects a block of shares sold at a weighted average price, with footnotes describing the underlying price ranges for the multiple trades included in each reported block.

Filing Impact

(Very High)

Filing Sentiment

(Very Negative)

Form Type

Rhea-AI Filing Summary

Seagate Technology Holdings plc CEO William D. Mosley reported open-market sales of 20,000 Ordinary Shares on April 1, 2026, across 21 transactions at prices generally around $400–$428 per share. These were all non-derivative sales of existing shares.

After these trades, Mosley directly holds 355,591 Ordinary Shares. According to the disclosure, all transactions were effected under a Rule 10b5-1 trading plan adopted on February 20, 2025, indicating the sales were pre-arranged rather than discretionary.

Insider Trade Summary 10b5-1

Net Seller: 20,000 shares ($8,414,638)

Net Sell 21 txns

Insider MOSLEY WILLIAM D

Role CEO

Sold 20,000 shs ($8.41M)

Type	Security	Shares	Price	Value
Sale	Ordinary Shares	100	$399.05	$40K
Sale	Ordinary Shares	200	$400.335	$80K
Sale	Ordinary Shares	100	$404.06	$40K
Sale	Ordinary Shares	100	$407.48	$41K
Sale	Ordinary Shares	200	$409.18	$82K
Sale	Ordinary Shares	100	$410.83	$41K
Sale	Ordinary Shares	300	$412.2833	$124K
Sale	Ordinary Shares	300	$413.9667	$124K
Sale	Ordinary Shares	800	$415.2313	$332K
Sale	Ordinary Shares	1,100	$416.5597	$458K
Sale	Ordinary Shares	808	$417.4505	$337K
Sale	Ordinary Shares	1,092	$418.7858	$457K
Sale	Ordinary Shares	1,500	$419.9356	$630K
Sale	Ordinary Shares	2,900	$420.7721	$1.22M
Sale	Ordinary Shares	2,887	$421.8372	$1.22M
Sale	Ordinary Shares	2,444	$422.9304	$1.03M
Sale	Ordinary Shares	1,469	$423.9752	$623K
Sale	Ordinary Shares	1,500	$424.9213	$637K
Sale	Ordinary Shares	1,000	$425.937	$426K
Sale	Ordinary Shares	800	$426.9313	$342K
Sale	Ordinary Shares	300	$427.97	$128K

Holdings After Transaction: Ordinary Shares — 375,491 shares (Direct)

Footnotes (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 20, 2025. These Ordinary Shares were sold in multiple trades at prices ranging from $400.14 to $400.53. 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 $409.03 to $409.33. 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 $412.05 to $412.40. 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. These Ordinary Shares were sold in multiple trades at prices ranging from $413.57 to $414.29. 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 $414.85 to $415.69. 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 $416.18 to $417.14. 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 $417.22 to $418.18. 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 $418.22 to $419.10. 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 $419.33 to $420.31. 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. These Ordinary Shares were sold in multiple trades at prices ranging from $420.35 to $421.30. 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 $421.37 to $422.35. 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 $422.41 to $423.37. 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. These Ordinary Shares were sold in multiple trades at prices ranging from $423.41 to $424.38. 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. These Ordinary Shares were sold in multiple trades at prices ranging from $424.46 to $425.44. 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 $425.46 to $426.19. 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 $426.47 to $427.45. 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 $427.63 to $428.14. 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.

Key Figures

Shares sold: 20,000 shares Transactions count: 21 sales Post-sale holdings: 355,591 shares +4 more

7 metrics

Shares sold 20,000 shares Total Ordinary Shares sold on April 1, 2026

Transactions count 21 sales Number of separate open-market sale entries

Post-sale holdings 355,591 shares Ordinary Shares held directly after trades

Lowest reported sale price $400.14/share Lower end of disclosed price range in footnotes

Highest reported sale price $428.14/share Upper end of disclosed price range in footnotes

Rule 10b5-1 plan date February 20, 2025 Adoption date of CEO’s trading plan

Net share direction 20,000 share net-sell Net change from transaction summary

Key Terms

Rule 10b5-1 trading plan, open-market sale, weighted average sale price, Ordinary Shares, +1 more

5 terms

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.

open-market sale financial

"transaction_action: "open-market sale" with transaction code "S" for each entry"

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.

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.

non-derivative financial

"transaction_type: "non-derivative" for each reported sale of Ordinary Shares"

Form 4 Insider Transactions: What Each Field Means →

04/02/2026 - 04:53 PM

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).

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)

X	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	CEO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/01/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form 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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Ordinary Shares	04/01/2026		S		100⁽¹⁾	D	$399.05	375,491	D
Ordinary Shares	04/01/2026		S		200	D	$400.335⁽²⁾	375,291	D
Ordinary Shares	04/01/2026		S		100	D	$404.06	375,191	D
Ordinary Shares	04/01/2026		S		100	D	$407.48	375,091	D
Ordinary Shares	04/01/2026		S		200	D	$409.18⁽³⁾	374,891	D
Ordinary Shares	04/01/2026		S		100	D	$410.83	374,791	D
Ordinary Shares	04/01/2026		S		300	D	$412.2833⁽⁴⁾	374,491	D
Ordinary Shares	04/01/2026		S		300	D	$413.9667⁽⁵⁾	374,191	D
Ordinary Shares	04/01/2026		S		800	D	$415.2313⁽⁶⁾	373,391	D
Ordinary Shares	04/01/2026		S		1,100	D	$416.5597⁽⁷⁾	372,291	D
Ordinary Shares	04/01/2026		S		808	D	$417.4505⁽⁸⁾	371,483	D
Ordinary Shares	04/01/2026		S		1,092	D	$418.7858⁽⁹⁾	370,391	D
Ordinary Shares	04/01/2026		S		1,500	D	$419.9356⁽¹⁰⁾	368,891	D
Ordinary Shares	04/01/2026		S		2,900	D	$420.7721⁽¹¹⁾	365,991	D
Ordinary Shares	04/01/2026		S		2,887	D	$421.8372⁽¹²⁾	363,104	D
Ordinary Shares	04/01/2026		S		2,444	D	$422.9304⁽¹³⁾	360,660	D
Ordinary Shares	04/01/2026		S		1,469	D	$423.9752⁽¹⁴⁾	359,191	D
Ordinary Shares	04/01/2026		S		1,500	D	$424.9213⁽¹⁵⁾	357,691	D
Ordinary Shares	04/01/2026		S		1,000	D	$425.937⁽¹⁶⁾	356,691	D
Ordinary Shares	04/01/2026		S		800	D	$426.9313⁽¹⁷⁾	355,891	D
Ordinary Shares	04/01/2026		S		300	D	$427.97⁽¹⁸⁾	355,591	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

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 20, 2025.

2. These Ordinary Shares were sold in multiple trades at prices ranging from $400.14 to $400.53. 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.

3. These Ordinary Shares were sold in multiple trades at prices ranging from $409.03 to $409.33. 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.

4. These Ordinary Shares were sold in multiple trades at prices ranging from $412.05 to $412.40. 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.

5. These Ordinary Shares were sold in multiple trades at prices ranging from $413.57 to $414.29. 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 $414.85 to $415.69. 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.

7. These Ordinary Shares were sold in multiple trades at prices ranging from $416.18 to $417.14. 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 $417.22 to $418.18. 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.

9. These Ordinary Shares were sold in multiple trades at prices ranging from $418.22 to $419.10. 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 $419.33 to $420.31. 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.

11. These Ordinary Shares were sold in multiple trades at prices ranging from $420.35 to $421.30. 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 $421.37 to $422.35. 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 $422.41 to $423.37. 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.

14. These Ordinary Shares were sold in multiple trades at prices ranging from $423.41 to $424.38. 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.

15. These Ordinary Shares were sold in multiple trades at prices ranging from $424.46 to $425.44. 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.

16. These Ordinary Shares were sold in multiple trades at prices ranging from $425.46 to $426.19. 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.

17. These Ordinary Shares were sold in multiple trades at prices ranging from $426.47 to $427.45. 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 $427.63 to $428.14. 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	04/02/2026
	** 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.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR

FAQ

How many Seagate (STX) shares did CEO William Mosley sell in this Form 4?

CEO William D. Mosley sold 20,000 Seagate Ordinary Shares in total, spread across 21 open-market transactions on April 1, 2026. The trades involved only non-derivative stock, reflecting a series of planned sales rather than option exercises.

What prices did the Seagate (STX) CEO receive for the shares sold?

The reported Seagate CEO sales occurred at prices generally around $400–$428 per share. Footnotes state the shares were sold in multiple trades within narrower ranges, with the Form 4 showing weighted average sale prices for each transaction block.

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

Following the reported transactions, CEO William D. Mosley directly holds 355,591 Ordinary Shares of Seagate. This figure reflects his remaining position after selling 20,000 shares in multiple open-market trades disclosed in the Form 4 filing.

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

The filing reports only non-derivative open-market sales of Seagate Ordinary Shares, coded as “S” transactions. There are no option exercises, gifts, or tax-withholding entries, and the derivative position summary is empty in this particular disclosure.

How many individual trades did the Seagate (STX) CEO execute in this sale program?

The Form 4 shows 21 separate sale transactions on April 1, 2026. Each line reflects a block of shares sold at a weighted average price, with footnotes describing the underlying price ranges for the multiple trades included in each reported block.