Seagate (STX) CEO reports ~$10M share sale to an exchange fund

Rhea-AI Filing Summary

Seagate Technology Holdings plc CEO William D. Mosley reported a sale of 24,584 ordinary shares on March 19, 2026. The transaction, coded as an open-market sale, is described in the notes as a contribution of Seagate securities to an exchange fund in return for an interest in that fund.

The contributed shares had an aggregate value of approximately $10,000,000, based on the closing stock price of the company’s common stock on March 18, 2026. Following this transaction, Mosley directly holds 375,591 Seagate ordinary shares, indicating he retains a substantial equity position in the company.

Insights

Insider transactions analyst

CEO shifts ~$10M in Seagate shares into an exchange fund, modestly trimming holdings.

The CEO of Seagate Technology Holdings plc, William D. Mosley, reported a disposition of 24,584 ordinary shares. While coded as an open-market sale for Section 16 purposes, the footnote explains the shares were contributed to an exchange fund in exchange for an interest in that fund, effectively diversifying personal exposure.

The contributed shares were valued at approximately $10,000,000, using the March 18, 2026 closing stock price. After the transaction, Mosley still directly owns 375,591 shares, so the move represents a relatively small portion of his visible stake and looks more like personal portfolio management than a major shift in alignment with shareholders.

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)
03/19/2026

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)
			Code	V	Amount	(A) or (D)	Price
Ordinary Shares	03/19/2026		S(1)		24,584	D	$406.77(1)	375,591	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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The reported transaction reflects the contribution of issuer securities to an exchange fund in exchange for interest in the exchange fund. For purposes of Section 16, the transaction is being reported as a sale. The value of the securities contributed, and the corresponding interest received, was determined based on closing stock price of the issuer's common stock on March 18, 2026, with an aggregate value of approximately $10,000,000.

Remarks:

	/s/ Louis J. Thorson, Attorney-in-Fact for William D. Mosley	03/23/2026
	** 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)

FAQ

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

Seagate reported that CEO William D. Mosley disposed of 24,584 ordinary shares. The Form 4 shows this as an open-market sale on March 19, 2026, though a footnote clarifies the shares were contributed to an exchange fund rather than sold for cash in a typical market trade.

How large was the Seagate (STX) CEO’s recent share transaction in dollar terms?

The Seagate CEO’s transaction was valued at approximately $10,000,000. The footnote states that the value of the 24,584 contributed shares, and the corresponding exchange fund interest, was based on the March 18, 2026 closing stock price of Seagate’s common stock.

How many Seagate (STX) shares does CEO William D. Mosley hold after this Form 4?

After the reported transaction, CEO William D. Mosley holds 375,591 ordinary shares. This post-transaction balance, disclosed in the Form 4, indicates that the 24,584-share disposition represents a relatively small portion of his overall direct Seagate share ownership.

Was the Seagate (STX) CEO’s transaction a normal sale or an exchange fund contribution?

The transaction is reported as a sale but functionally is an exchange fund contribution. According to the footnote, Seagate securities were contributed to an exchange fund in return for an interest in that fund, and for Section 16 reporting it is treated as a sale.

What is the significance of the March 18, 2026 date in Seagate (STX) CEO’s Form 4?

March 18, 2026 is the pricing date used to value the contributed shares. The footnote explains that the approximate $10,000,000 aggregate value was determined using Seagate’s closing stock price on that date for both the contributed shares and the exchange fund interest received.

Does the Seagate (STX) CEO’s $10M share disposition indicate he is exiting his position?

The filing shows a partial disposition, not an exit. While 24,584 shares, valued at about $10,000,000, were contributed to an exchange fund, Mosley still directly owns 375,591 shares, suggesting he maintains a substantial ongoing equity stake in Seagate.