Seagate officer plans sale of 14,849 shares

Officer John C. Morris files a Rule 144 notice to sell Seagate shares from option exercises and equity awards, following several recent sales.

Rhea-AI Filing Summary

Seagate Technology Holdings plc (STX) reports that officer John C. Morris filed a notice to sell up to 14,849 shares of common stock through Morgan Stanley Smith Barney on or about September 21, 2026 on NASDAQ, under Rule 144. The shares relate to exercises of stock options and the vesting of restricted and performance stock units between September 2025 and September 2026. Recent sales by Morris over the past three months included multiple transactions in Seagate common stock, some executed under a Rule 10b5-1 trading plan.

Key Figures

Shares to be sold under Rule 144: 14,849 shares Aggregate market value of planned sale: $12,752,172.71 Shares outstanding: 226,644,518 shares +3 more

6 metrics

Shares to be sold under Rule 144 14,849 shares Maximum common shares listed for sale by John C. Morris

Aggregate market value of planned sale $12,752,172.71 Aggregate value for the 14,849 shares to be sold

Shares outstanding 226,644,518 shares Common shares outstanding for Seagate Technology Holdings plc

Recent sale on September 15, 2026 15,465 shares for $11,941,318.31 Common stock sale by John C. Morris in past three months

Recent sale on August 21, 2026 3,515 shares for $2,985,482.12 Common stock sale by John C. Morris in past three months

10b5-1 sale on August 20, 2026 523 shares for $436,987.42 Seagate common stock sold under a Rule 10b5-1 plan

Key Terms

Rule 144, 10b5-1, Restricted Stock Units, Performance Stock Units, +1 more

5 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

10b5-1 regulatory

"10b5-1 Sales for JOHN C MORRIS 121 Woodlands Avenue 5 Singapore"

A 10b5-1 plan is a pre-set schedule that lets company insiders buy or sell shares according to written instructions made when they do not possess material, nonpublic information. Think of it as a timed automatic payment for stock trades: it helps insiders avoid accusations of trading on secret information and gives outside investors a clearer signal about whether sales are routine or potentially informative about the company’s prospects.

Restricted Stock Units financial

"Restricted Stock Units | Issuer | | | 3138 | 09/09/2025"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

Performance Stock Units financial

"Performance Stock Units | Issuer | | | 8967 | 09/14/2025"

Performance stock units are a type of company award that grants employees shares of stock only if certain performance goals are met. They motivate employees to work toward specific company achievements, aligning their interests with those of shareholders. For investors, they can influence a company's future stock supply and reflect management’s confidence in reaching key targets.

Exercise of Stock Options financial

"Exercise of Stock Options | Issuer | | | 2744 | 09/21/2026"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does the Form 144 filing disclose for Seagate Technology (STX)?

The filing discloses that officer John C. Morris intends to sell up to 14,849 shares of Seagate common stock under Rule 144, primarily from stock option exercises and vested restricted and performance stock units.

How many Seagate (STX) shares does John C. Morris plan to sell under this notice?

John C. Morris plans to sell up to 14,849 shares of Seagate common stock. The notice lists an aggregate market value of $12,752,172.71 for these shares and indicates sales are expected around September 21, 2026 on NASDAQ.

What is the source of the Seagate (STX) shares being sold by John C. Morris?

The shares to be sold were and will be received upon the exercise of stock options, and were acquired upon the vesting of restricted stock units between September 9–11, 2025 and performance stock units between September 14, 2025 and September 14, 2026.

What recent Seagate (STX) stock sales has John C. Morris reported in the last three months?

Reported sales over the past three months include 15,465 shares of common stock on September 15, 2026 for $11,941,318.31, and additional smaller sales on September 14, 2026, September 10, 2026, and August 21, 2026.

Are any of John C. Morris’s recent Seagate (STX) sales under a Rule 10b5-1 plan?

Yes. The notice identifies 10b5-1 sales for John C. Morris in Seagate common stock, including transactions on August 20, 2026 and August 3, 2026, with reported sale values of $436,987.42 and $137,383.68, respectively.

How many Seagate (STX) shares are reported as outstanding in the filing?

The filing lists 226,644,518 shares of Seagate common stock as outstanding as of the Form 144 information table, providing context for the planned 14,849-share sale under Rule 144.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/21/2026 - 04:35 PM Accepted by SEC EDGAR 09/21/2026 - 04:34 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001988271
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	SEAGATE TECHNOLOGY HOLDINGS PUBLIC LIMITED COMPANY
SEC File Number	001-31560
Address of Issuer	121 Woodlands Avenue 5 Singapore SINGAPORE 739009
Phone	6560182562
Name of Person for Whose Account the Securities are To Be Sold	JOHN C MORRIS
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	14849	12752172.71	226644518	09/21/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	09/21/2026	Exercise of Stock Options	Issuer			2744	09/21/2026	Cash
Common	09/09/2025	Restricted Stock Units	Issuer			3138	09/09/2025	N/A
Common	09/14/2025	Performance Stock Units	Issuer			8967	09/14/2025	N/A

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
JOHN C MORRIS 121 Woodlands Avenue 5 Singapore U0 739009	Common	09/15/2026	15465	11941318.31
JOHN C MORRIS 121 Woodlands Avenue 5 Singapore U0 739009	Common	09/14/2026	492	384366.39
JOHN C MORRIS 121 Woodlands Avenue 5 Singapore U0 739009	Common	09/10/2026	572	493139.01
JOHN C MORRIS 121 Woodlands Avenue 5 Singapore U0 739009	Common	08/21/2026	3515	2985482.12
10b5-1 Sales for JOHN C MORRIS 121 Woodlands Avenue 5 Singapore U0 739009	Common	08/20/2026	523	436987.42
10b5-1 Sales for JOHN C MORRIS 121 Woodlands Avenue 5 Singapore U0 739009	Common	08/03/2026	168	137383.68

144: Remarks and Signature

Remarks	The securities to be sold were and will be received upon the exercise of stock options over the next three months. The dates of acquisition and payment were and will be the dates of exercise/sale. The securities to be sold were acquired upon the vesting of restricted stock units during the period of 09/09/2025 through 09/11/2025 and performance stock units during the period of 09/14/2025 through 09/14/2026.
Date of Notice	09/21/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	01/29/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ John Morris
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)