Insider files Form 144 to sell 7,361 shares of STX (NASDAQ: STX)

Rhea-AI Filing Summary

An affiliate of Ban Seng Teh filed to potentially sell up to 7,361 shares of common stock through Morgan Stanley Smith Barney LLC Executive Financial Services on NASDAQ, with a noted date of 08/13/2026. The filing also lists prior sales over the past three months, including 8,003 shares on 05/14/2026, 663 shares on 06/10/2026, and 989 shares on 06/12/2026, each with stated aggregate transaction values.

Key Figures

Shares to be sold: 7,361 shares Shares from stock option exercise: 6,002 shares Restricted stock source 1: 599 shares +5 more

8 metrics

Shares to be sold 7,361 shares Common stock listed with Morgan Stanley Smith Barney LLC EFS and NASDAQ, dated 08/13/2026

Shares from stock option exercise 6,002 shares Common stock from Stock Option Exercise with issuer, dated 08/13/2026

Restricted stock source 1 599 shares Common stock from Restricted Stock, dated 03/09/2026

Restricted stock source 2 599 shares Common stock from Restricted Stock, dated 06/09/2026

ESPP shares 161 shares Common stock from Employee Stock Purchase Plan, dated 01/30/2026

Sale on 05/14/2026 8,003 shares; 6,540,725.45 aggregate Common stock sold by Ban Seng Teh during the past 3 months

Sale on 06/10/2026 663 shares; 544,893.18 aggregate Common stock sold by Ban Seng Teh during the past 3 months

Sale on 06/12/2026 989 shares; 870,507.91 aggregate Common stock sold by Ban Seng Teh during the past 3 months

Key Terms

Form 144, Stock Option Exercise, Restricted Stock, Employee Stock Purchase Plan, +1 more

5 terms

Form 144 regulatory

"144: Securities To Be Sold Common | 08/13/2026 | Stock Option Exercise"

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.

Stock Option Exercise financial

"Common | 08/13/2026 | Stock Option Exercise | Issuer"

A stock option exercise is the act of using a previously granted right to buy shares of a company's stock at a specific, predetermined price by paying that price and receiving the shares. It matters to investors because exercising changes who owns the shares (which can dilute existing ownership), can trigger taxable events and shift potential gains or losses, and affects voting power and the company’s outstanding share count—like turning a voucher into an actual product that becomes part of circulating supply.

Restricted Stock financial

"Common | 03/09/2026 | Restricted Stock | Issuer"

Shares granted to an individual that carry limits on transfer or sale until certain conditions are met, such as staying with the company for a set time or hitting performance targets. Think of them as a locked gift that gradually opens; for investors they matter because they affect how many shares may enter the market later, signal management incentives and potential dilution, and reveal confidence in future company performance.

Employee Stock Purchase Plan financial

"Common | 01/30/2026 | Employee Stock Purchase Plan | Issuer"

An employee stock purchase plan is a company program that lets workers buy shares through small payroll deductions, often at a discount to the market price and after a set offering period. Think of it like a workplace savings plan that turns into ownership: it encourages employees to share in the company’s success and can create predictable buying or selling of stock that investors watch because it affects supply, demand and employee incentives.

Executive Financial Services financial

"Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza"

FAQ

What does the Form 144 filing for STX disclose about planned share sales?

The Form 144 indicates a plan to sell up to 7,361 shares of common stock through Morgan Stanley Smith Barney LLC on NASDAQ, with a noted date of 08/13/2026. This represents a proposed disposition by an affiliate of Ban Seng Teh.

Who is the reporting person in the STX Form 144 and what is their address?

The reporting person is Ban Seng Teh, with an address at 121 Woodlands Avenue 5, Singapore 739009. This information helps identify the insider or affiliate responsible for the proposed and recent share transactions.

How many STX shares has Ban Seng Teh sold in the past three months?

The filing lists three recent transactions: 8,003 shares on 05/14/2026, 663 shares on 06/10/2026, and 989 shares on 06/12/2026. Each entry includes corresponding aggregate transaction values for these common stock sales.

What types of STX equity awards are referenced in the Form 144?

The filing references several equity sources: Stock Option Exercise, Restricted Stock (with dates 03/09/2026 and 06/09/2026), and an Employee Stock Purchase Plan dated 01/30/2026, each tied to specific share amounts potentially available for sale.

Through which broker will the STX Form 144 sales be executed?

The proposed sale of up to 7,361 shares is associated with Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, 8th Floor, New York, NY 10004, as the broker handling the potential transactions.

On which exchange are the STX shares in this Form 144 listed?

The common stock referenced in the Form 144 is identified as traded on NASDAQ. The filing ties the proposed sale of up to 7,361 shares of common stock to this listing venue, providing context for where the securities are traded.

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Available on EDGAR 08/13/2026 - 04:19 PM Accepted by SEC EDGAR 08/13/2026 - 04:18 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
Filer CCC
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

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

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	7361	6778028.17	226644518	08/13/2026	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	08/13/2026	Stock Option Exercise	Issuer			6002	08/13/2026	Cash
Common	03/09/2026	Restricted Stock	Issuer			599	03/09/2026	Not Applicable
Common	06/09/2026	Restricted Stock	Issuer			599	06/09/2026	Not Applicable
Common	01/30/2026	Employee Stock Purchase Plan	Issuer			161	01/30/2026	Cash

* 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
BAN SENG TEH 121 Woodlands Avenue 5 Singapore U0 739009	Common	06/12/2026	989	870507.91
BAN SENG TEH 121 Woodlands Avenue 5 Singapore U0 739009	Common	06/10/2026	663	544893.18
BAN SENG TEH 121 Woodlands Avenue 5 Singapore U0 739009	Common	05/14/2026	8003	6540725.45

144: Remarks and Signature

Remarks

Date of Notice

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

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)