STX insider plans sale of 694 common shares

James C. Lee filed a Form 144 indicating an intention to sell up to 694 shares of common stock of STX through Morgan Stanley Smith Barney LLC’s Executive Financial Services.

Rhea-AI Filing Summary

James C. Lee filed a Form 144 indicating an intention to sell up to 694 shares of common stock of STX through Morgan Stanley Smith Barney LLC’s Executive Financial Services. The planned sale has an aggregate market value of $530,514.42, with 224,228,992 shares outstanding as of July 30, 2026.

During the prior three months, Lee sold 542 shares on July 23, 2026 for $490,514.72 and 697 shares on May 4, 2026 for $516,595.49, with the filing noting these as 10b5-1 sales.

Key Figures

Shares planned for sale: 694 shares Planned sale value: $530,514.42 Shares outstanding: 224,228,992 shares +2 more

5 metrics

Shares planned for sale 694 shares Maximum common shares to be sold under current Form 144

Planned sale value $530,514.42 Aggregate market value of 694 shares to be sold

Shares outstanding 224,228,992 shares Common shares outstanding as of July 30, 2026

Recent sale 1 542 shares; $490,514.72 Common shares sold on July 23, 2026

Recent sale 2 697 shares; $516,595.49 Common shares sold on May 4, 2026 as 10b5-1 sale

Key Terms

Form 144, 10b5-1, Restricted Stock Units, aggregate market value

4 terms

Form 144 regulatory

"James C. Lee filed a Form 144 indicating an intention to sell"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

10b5-1 regulatory

"10b5-1 Sales for JAMES C LEE 121 Woodlands Avenue 5"

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

"Common | 07/22/2026 | Restricted Stock Units | Issuer"

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.

aggregate market value financial

"The planned sale has an aggregate market value of $530,514.42"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

FAQ

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

What does the Form 144 filing for STX by James C. Lee disclose?

The Form 144 shows James C. Lee intends to sell up to 694 STX common shares worth $530,514.42. It also lists prior three-month sales and confirms activity under a Rule 10b5-1 trading plan.

How many STX shares does James C. Lee plan to sell under this Form 144?

James C. Lee plans to sell up to 694 shares of STX common stock. The filing values this planned sale at an aggregate market value of $530,514.42, facilitated through Morgan Stanley Smith Barney LLC Executive Financial Services.

What recent STX stock sales by James C. Lee are reported in the Form 144?

The filing lists two recent sales: 542 shares on July 23, 2026 for $490,514.72 and 697 shares on May 4, 2026 for $516,595.49. Both are described as 10b5-1 sales.

What is the outstanding share count of STX referenced in the Form 144?

The Form 144 references 224,228,992 STX common shares outstanding as of July 30, 2026. This figure provides context but is separate from the 694 shares Lee plans to sell under the notice.

Is the STX Form 144 sale by James C. Lee under a 10b5-1 trading plan?

The filing states that the past transactions were 10b5-1 sales by James C. Lee. This indicates those trades followed a pre-arranged Rule 10b5-1 trading plan, which can structure sales independently of day-to-day market decisions.

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

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Available on EDGAR 07/30/2026 - 04:21 PM Accepted by SEC EDGAR 07/30/2026 - 04:21 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	0001773423
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	JAMES LEE
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	694	530514.42	224228992	07/30/2026	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	07/22/2026	Restricted Stock Units	Issuer			694	07/22/2026	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
JAMES C LEE 121 Woodlands Avenue 5 Singapore U0 739009	Common	07/23/2026	542	490514.72
10b5-1 Sales for JAMES C LEE 121 Woodlands Avenue 5 Singapore U0 739009	Common	05/04/2026	697	516595.49

144: Remarks and Signature

Remarks
Date of Notice	07/30/2026
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/ James Lee
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)