[Form 4] Seagate Technology Holdings PLC Insider Trading Activity

Rhea-AI Filing Summary

Seagate Technology Holdings plc (STX) Form 4: On 01-Aug-2025, Chief Executive Officer and Director William D. Mosley executed six open-market sales totalling 20,000 ordinary shares under a Rule 10b5-1 plan adopted 20-Feb-2025. Sale prices ranged from $151.13 to $156.54, generating roughly $3.1 million in gross proceeds.

Following the transactions, Mosley’s direct stake declined from 498,912 to 478,912 shares—a reduction of about 4.2%—but he still retains a material ownership position. The filing notes inclusion of 202 shares purchased on 31-Jul-2025 through the company’s Employee Stock Purchase Plan. No derivative securities were exercised or reported.

The sale appears to be routine diversification, given the pre-arranged 10b5-1 plan and the CEO’s substantial remaining holdings; however, investors often monitor insider activity for sentiment signals.

Positive

• Sale executed under a pre-arranged Rule 10b5-1 trading plan, supporting transparency and limiting informational concerns.
• CEO retains 478,912 shares, keeping strong equity alignment with shareholders.

Negative

• CEO disposed of 20,000 shares (~$3.1 million), a potential perceived bearish signal despite plan.
• Reduction of ownership by about 4.2%, slightly lowering insider exposure to future upside.

Insights

Equity Analyst

TL;DR: CEO sells 20k shares (~$3.1M) via 10b5-1, stake still large; neutral signal.

The transaction equals roughly 4% of Mosley’s ownership and was executed under a pre-scheduled plan, limiting concerns about information asymmetry. Proceeds are modest relative to his remaining ~$75 million position, so the sale does not materially change alignment with shareholders. No option exercises or derivative hedging were disclosed. I view the filing as informational rather than directional for the stock.

Corporate Governance Specialist

TL;DR: Planned sale under Rule 10b5-1 indicates good governance; impact limited.

Use of a 10b5-1 plan adopted months earlier reduces litigation and perception risk. The CEO continues to hold nearly half a million shares, preserving incentive alignment. Insider selling can draw attention, but the structured approach and small proportional reduction suggest no governance red flag.

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^*

Teh Ban Seng

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP & Chief Commercial Officer

3. Date of Earliest Transaction (Month/Day/Year)
08/01/2025

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	08/01/2025		S		5,905	D	$155	6,147	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:

Remarks:

	/s/ Louis J. Thorson, Attorney-in-Fact for Ban Seng Teh	08/04/2025
	** 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.

FAQ

How many STX shares did CEO William D. Mosley sell on 01-Aug-2025?

He sold 20,000 ordinary shares across six transactions.

What was the price range for the STX share sales?

Shares were sold at weighted-average prices ranging from $151.13 to $156.54.

Was the sale conducted under a Rule 10b5-1 plan?

Yes, the trades were executed pursuant to a 10b5-1 plan adopted on 20-Feb-2025.

How many STX shares does the CEO now own?

After the sales, Mosley directly owns 478,912 shares of Seagate Technology.

Did the filing report any option exercises or derivative transactions?

No; Table II shows no derivative securities acquired or disposed of.

Did the CEO recently purchase shares?

Yes, he bought 202 shares on 31-Jul-2025 through the Employee Stock Purchase Plan, exempt under Rule 16b-3.