What is William Mosley’s Seagate (STX) share ownership after these transactions?

After the reported trades, William Mosley directly held 341,517 Seagate Ordinary Shares. The Form 4 also shows he held 125,100 NQ Options following the derivative transaction, giving visibility into both his current equity stake and remaining option-based exposure.

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

All the reported transactions were effected under a Rule 10b5-1 trading plan. A footnote explains the plan was adopted on February 18, 2026, indicating the timing and size of the July 1, 2026 trades were pre-arranged rather than decided on that trading day.

Seagate (STX) CEO Mosley sells 20,657 shares, exercises 14,000 options

Filing Impact

(Very High)

Filing Sentiment

(Very Negative)

Form Type

Rhea-AI Filing Summary

Seagate Technology Holdings plc CEO William D. Mosley reported a series of insider trades in Ordinary Shares. On July 1, 2026, he executed open-market sales totaling 20,657 shares at prices generally around $890–$920 per share, in multiple transactions.

These sales were carried out under a pre-arranged Rule 10b5-1 trading plan adopted on February 18, 2026. On the same date, Mosley also exercised options to acquire 14,000 Ordinary Shares at an exercise price of $46.23 per share. Following these transactions, he directly held 341,517 Ordinary Shares and 125,100 NQ Options.

Insider Trade Summary 10b5-1

Net Seller: 20,657 shares ($18,807,775)

Net Sell 31 txns

Insider MOSLEY WILLIAM D

Role CEO

Sold 20,657 shs ($18.81M)

Type	Security	Shares	Price	Value
Exercise	NQ Options	14,000	$0.00	--
Exercise	Ordinary Shares	14,000	$46.23	$647K
Sale	Ordinary Shares	320	$887.9738	$284K
Sale	Ordinary Shares	320	$890.015	$285K
Sale	Ordinary Shares	120	$891.13	$107K
Sale	Ordinary Shares	200	$892.08	$178K
Sale	Ordinary Shares	40	$892.93	$36K
Sale	Ordinary Shares	266	$894.3945	$238K
Sale	Ordinary Shares	254	$895.6612	$227K
Sale	Ordinary Shares	400	$896.775	$359K
Sale	Ordinary Shares	340	$897.7822	$305K
Sale	Ordinary Shares	300	$898.7933	$270K
Sale	Ordinary Shares	308	$900.0465	$277K
Sale	Ordinary Shares	401	$900.8231	$361K
Sale	Ordinary Shares	320	$902.1375	$289K
Sale	Ordinary Shares	560	$903.0821	$506K
Sale	Ordinary Shares	720	$904.3607	$651K
Sale	Ordinary Shares	320	$905.1188	$290K
Sale	Ordinary Shares	609	$906.4731	$552K
Sale	Ordinary Shares	391	$907.5569	$355K
Sale	Ordinary Shares	560	$908.4157	$509K
Sale	Ordinary Shares	441	$909.5226	$401K
Sale	Ordinary Shares	399	$910.4946	$363K
Sale	Ordinary Shares	960	$911.6325	$875K
Sale	Ordinary Shares	813	$912.7227	$742K
Sale	Ordinary Shares	1,596	$913.6524	$1.46M
Sale	Ordinary Shares	2,379	$914.7656	$2.18M
Sale	Ordinary Shares	2,308	$915.6507	$2.11M
Sale	Ordinary Shares	1,185	$916.6086	$1.09M
Sale	Ordinary Shares	1,762	$917.671	$1.62M
Sale	Ordinary Shares	2,065	$918.67	$1.90M

Holdings After Transaction: NQ Options — 125,100 shares (Direct, null); Ordinary Shares — 341,517 shares (Direct, null)

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 18, 2026. These Ordinary Shares were sold in multiple trades at prices ranging from $887.74 to $888.06. 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 $889.61 to $890.12. 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 $890.81 to $891.49. 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 $891.88 to $892.78. 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 $894.09 to $895.06. 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 $895.09 to $895.80. 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 $896.21 to $897.00. 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 $897.42 to $898.36. 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. These Ordinary Shares were sold in multiple trades at prices ranging from $898.42 to $899.21. 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. These Ordinary Shares were sold in multiple trades at prices ranging from $899.45 to $900.43. 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 $900.45 to $901.42. 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 $901.54 to $902.36. 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. These Ordinary Shares were sold in multiple trades at prices ranging from $902.67 to $903.39. 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 $903.84 to $904.74. 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 $904.86 to $905.72. 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 $905.88 to $906.84. 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 $907.01 to $908.00. 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 $908.01 to $908.99. 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. These Ordinary Shares were sold in multiple trades at prices ranging from $909.11 to $910.01. 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 $910.12 to $910.82. 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 $911.15 to $912.14. 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 $912.15 to $913.13. 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 $913.16 to $914.11. 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. These Ordinary Shares were sold in multiple trades at prices ranging from $914.17 to $915.165. 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 $915.17 to $916.12. 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 $916.18 to $917.13. 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 $917.18 to $918.17. 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 $918.18 to $919.17. 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. Options granted to the Reporting Person under the Issuer's 2012 Equity Incentive Plan are subject to a four year vesting schedule. Subject to continuous employment, one quarter of the option shares vested on September 9, 2021. The remaining option shares vested in equal monthly installments over the 36 months following September 9, 2021.

Key Figures

Shares sold: 20,657 shares Sale price range: $887.74–$919.17 per share Options exercised: 14,000 shares +3 more

6 metrics

Shares sold 20,657 shares Open-market sales of Ordinary Shares on July 1, 2026

Sale price range $887.74–$919.17 per share Price ranges from multiple sale footnotes

Options exercised 14,000 shares Ordinary Shares acquired via option exercise on July 1, 2026

Option exercise price $46.23 per share Exercise price for 14,000-share option grant

Shares held after 341,517 shares Direct Ordinary Share holdings following reported transactions

NQ options remaining 125,100 options Total NQ Options held after derivative transaction

Key Terms

Rule 10b5-1 trading plan, NQ Options, weighted average sale price, derivative security, +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 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.

NQ Options financial

"security_title: "NQ Options" with underlying security title "Ordinary Shares""

weighted average sale price financial

"The price reported above reflects the weighted average sale price."

derivative security financial

"transaction_code_description: "Exercise or conversion of derivative security""

A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.

Equity Incentive Plan financial

"Options granted to the Reporting Person under the Issuer's 2012 Equity Incentive Plan are subject to a four year vesting schedule."

An equity incentive plan is a program that gives employees, executives or directors the right to receive company stock or options to buy stock as part of their pay. Think of it as offering slices of future company profit to motivate people to boost long‑term performance; for investors it matters because it can align employee goals with shareholder value but also increases the number of shares outstanding, which can dilute existing ownership.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 07/02/2026 - 04:42 PM Accepted by SEC EDGAR 07/02/2026 - 04:40 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)
07/01/2026

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	07/01/2026		M		14,000⁽¹⁾	A	$46.23	341,517	D
Ordinary Shares	07/01/2026		S		320	D	$887.9738⁽²⁾	341,197	D
Ordinary Shares	07/01/2026		S		320	D	$890.015⁽³⁾	340,877	D
Ordinary Shares	07/01/2026		S		120	D	$891.13⁽⁴⁾	340,757	D
Ordinary Shares	07/01/2026		S		200	D	$892.08⁽⁵⁾	340,557	D
Ordinary Shares	07/01/2026		S		40	D	$892.93	340,517	D
Ordinary Shares	07/01/2026		S		266	D	$894.3945⁽⁶⁾	340,251	D
Ordinary Shares	07/01/2026		S		254	D	$895.6612⁽⁷⁾	339,997	D
Ordinary Shares	07/01/2026		S		400	D	$896.775⁽⁸⁾	339,597	D
Ordinary Shares	07/01/2026		S		340	D	$897.7822⁽⁹⁾	339,257	D
Ordinary Shares	07/01/2026		S		300	D	$898.7933⁽¹⁰⁾	338,957	D
Ordinary Shares	07/01/2026		S		308	D	$900.0465⁽¹¹⁾	338,649	D
Ordinary Shares	07/01/2026		S		401	D	$900.8231⁽¹²⁾	338,248	D
Ordinary Shares	07/01/2026		S		320	D	$902.1375⁽¹³⁾	337,928	D
Ordinary Shares	07/01/2026		S		560	D	$903.0821⁽¹⁴⁾	337,368	D
Ordinary Shares	07/01/2026		S		720	D	$904.3607⁽¹⁵⁾	336,648	D
Ordinary Shares	07/01/2026		S		320	D	$905.1188⁽¹⁶⁾	336,328	D
Ordinary Shares	07/01/2026		S		609	D	$906.4731⁽¹⁷⁾	335,719	D
Ordinary Shares	07/01/2026		S		391	D	$907.5569⁽¹⁸⁾	335,328	D
Ordinary Shares	07/01/2026		S		560	D	$908.4157⁽¹⁹⁾	334,768	D
Ordinary Shares	07/01/2026		S		441	D	$909.5226⁽²⁰⁾	334,327	D
Ordinary Shares	07/01/2026		S		399	D	$910.4946⁽²¹⁾	333,928	D
Ordinary Shares	07/01/2026		S		960	D	$911.6325⁽²²⁾	332,968	D
Ordinary Shares	07/01/2026		S		813	D	$912.7227⁽²³⁾	332,155	D
Ordinary Shares	07/01/2026		S		1,596	D	$913.6524⁽²⁴⁾	330,559	D
Ordinary Shares	07/01/2026		S		2,379	D	$914.7656⁽²⁵⁾	328,180	D
Ordinary Shares	07/01/2026		S		2,308	D	$915.6507⁽²⁶⁾	325,872	D
Ordinary Shares	07/01/2026		S		1,185	D	$916.6086⁽²⁷⁾	324,687	D
Ordinary Shares	07/01/2026		S		1,762	D	$917.671⁽²⁸⁾	322,925	D
Ordinary Shares	07/01/2026		S		2,065	D	$918.67⁽²⁹⁾	320,860	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)
NQ Options	$46.23	07/01/2026		M			14,000	⁽³⁰⁾	09/09/2027	Ordinary Shares	14,000	$0	125,100	D

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 $887.74 to $888.06. 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 $889.61 to $890.12. 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 $890.81 to $891.49. 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 $891.88 to $892.78. 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 $894.09 to $895.06. 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 $895.09 to $895.80. 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 $896.21 to $897.00. 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 $897.42 to $898.36. 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.

10. These Ordinary Shares were sold in multiple trades at prices ranging from $898.42 to $899.21. 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.

11. These Ordinary Shares were sold in multiple trades at prices ranging from $899.45 to $900.43. 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.

12. These Ordinary Shares were sold in multiple trades at prices ranging from $900.45 to $901.42. 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 $901.54 to $902.36. 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.

14. These Ordinary Shares were sold in multiple trades at prices ranging from $902.67 to $903.39. 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 $903.84 to $904.74. 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 $904.86 to $905.72. 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 $905.88 to $906.84. 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 $907.01 to $908.00. 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 $908.01 to $908.99. 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.

20. These Ordinary Shares were sold in multiple trades at prices ranging from $909.11 to $910.01. 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 $910.12 to $910.82. 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.

22. These Ordinary Shares were sold in multiple trades at prices ranging from $911.15 to $912.14. 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.

23. These Ordinary Shares were sold in multiple trades at prices ranging from $912.15 to $913.13. 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.

24. These Ordinary Shares were sold in multiple trades at prices ranging from $913.16 to $914.11. 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.

25. These Ordinary Shares were sold in multiple trades at prices ranging from $914.17 to $915.165. 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.

26. These Ordinary Shares were sold in multiple trades at prices ranging from $915.17 to $916.12. 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.

27. These Ordinary Shares were sold in multiple trades at prices ranging from $916.18 to $917.13. 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.

28. These Ordinary Shares were sold in multiple trades at prices ranging from $917.18 to $918.17. 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.

29. These Ordinary Shares were sold in multiple trades at prices ranging from $918.18 to $919.17. 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.

30. Options granted to the Reporting Person under the Issuer's 2012 Equity Incentive Plan are subject to a four year vesting schedule. Subject to continuous employment, one quarter of the option shares vested on September 9, 2021. The remaining option shares vested in equal monthly installments over the 36 months following September 9, 2021.

Remarks:

	/s/ Louis J. Thorson, Attorney-in-Fact for William D. Mosley	07/02/2026
	** 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

What insider transaction did Seagate (STX) CEO William Mosley report?

Seagate CEO William Mosley reported multiple open-market sales of Ordinary Shares and an option exercise. He sold 20,657 shares in several trades and exercised options for 14,000 shares, all dated July 1, 2026, under a disclosed Rule 10b5-1 trading plan.

How many Seagate (STX) shares did the CEO sell and at what prices?

William Mosley sold 20,657 Seagate Ordinary Shares in multiple open-market transactions. Footnotes state the trades occurred in price ranges roughly between $887.74 and $919.17 per share, with each Form 4 line showing a weighted average sale price within those ranges.

Did the Seagate (STX) CEO exercise stock options in this Form 4 filing?

Yes. William Mosley exercised options covering 14,000 Seagate Ordinary Shares at an exercise price of $46.23 per share. The options were granted under the company’s 2012 Equity Incentive Plan and followed a four-year vesting schedule tied to continuous employment conditions.

What vesting terms applied to the Seagate (STX) options the CEO exercised?

The exercised options were granted under Seagate’s 2012 Equity Incentive Plan and vested over four years. One quarter vested on September 9, 2021, with the remaining shares vesting in equal monthly installments over the following 36 months, subject to continued employment.