Morgan Stanley Smith Barney files Rule 144; STX (NASDAQGS: STX) RSU vesting 3,319 shares listed

Rhea-AI Filing Summary

Morgan Stanley Smith Barney LLC submitted a Rule 144 notice regarding proposed sales of Common stock for STX tied to restricted stock unit vesting. The filing lists 3,319 shares associated with a 06/11/2026 vesting and multiple dispositions by William Mosley totaling 83,855 shares across April–June 2026.

The document records sale dates and gross proceeds for each Mosley disposition, and labels the 3,319 shares as compensation for service. Timing and method details beyond the listed dates are not included in the excerpt.

Insights

Securities Compliance Analyst

Rule 144 notice lists vested RSUs and recent sales by an individual.

The filing shows a planned sale tied to Restricted Stock Unit Vesting of 3,319 shares on 06/11/2026, described as compensation for service. It also itemizes prior sales by William Mosley on 04/01/2026, 05/20/2026, 06/01/2026, and 06/10/2026

These entries are procedural notifications required under the securities rules; cash‑flow treatment and distribution methods are not shown in the excerpt. Subsequent filings would confirm completion or methods of disposition.

Key Figures

RSU vesting shares: 3,319 shares Mosley sale - 04/01/2026: 20,000 shares Mosley sale - 05/20/2026: 30,000 shares +3 more

6 metrics

RSU vesting shares 3,319 shares Restricted Stock Unit Vesting on 06/11/2026

Mosley sale - 04/01/2026 20,000 shares Sale on 04/01/2026 with proceeds $8,414,638.00

Mosley sale - 05/20/2026 30,000 shares Sale on 05/20/2026 with proceeds $22,538,568.00

Mosley sale - 06/01/2026 30,000 shares Sale on 06/01/2026 with proceeds $27,347,823.00

Mosley sale - 06/10/2026 2,855 shares Sale on 06/10/2026 with proceeds $2,345,873.82

Mosley total recent dispositions 83,855 shares Aggregate of listed sales in Apr–Jun 2026

Key Terms

Rule 144, Restricted Stock Unit (RSU), Compensation for Service

3 terms

Rule 144 regulatory

"Filer submitted a Rule 144 notice regarding proposed sales"

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.

Restricted Stock Unit (RSU) financial

"Restricted Stock Unit Vesting noted for 3,319 shares"

A restricted stock unit (RSU) is a promise from a company to give an employee company shares (or cash equal to their value) at a future date if certain conditions are met, such as staying with the company or hitting performance targets. For investors, RSUs matter because when they convert into actual shares they increase the number of shares available and can create selling pressure as employees cash out—think of them as a future paycheck paid in company stock.

Compensation for Service financial

"3319 ... 06/11/2026 ... Compensation for Service"

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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

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	1769	1535651.21	224228992	06/12/2026	NASDAQGS

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	06/11/2026	Restricted Stock Unit Vesting	Issuer			3319	06/11/2026	Compensation for Service

* 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
William Mosley 32932 Pacific Coast Hwy,14-476 Dana Point CA 92629	Common	04/01/2026	20000	8414638.00
William Mosley 32932 Pacific Coast Hwy,14-476 Dana Point CA 92629	Common	05/20/2026	30000	22538568.00
William Mosley 32932 Pacific Coast Hwy,14-476 Dana Point CA 92629	Common	06/01/2026	30000	27347823.00
William Mosley 32932 Pacific Coast Hwy,14-47 Dana Point CA 92629	Common	06/10/2026	2855	2345873.82

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)

FAQ

What does the STX Form 144 filed by Morgan Stanley Smith Barney LLC show?

The filing lists a planned sale of 3,319 shares tied to RSU vesting on 06/11/2026. It also records recent open market dispositions by William Mosley totaling 83,855 shares between April and June 2026.

Who is listed as selling shares in the STX excerpt?

The excerpt shows William Mosley as the seller of multiple lots: 20,000, 30,000, 30,000, and 2,855 shares on specified dates in 2026. The filer is Morgan Stanley Smith Barney LLC for the RSU vesting sale.

Are the 3,319 vested shares for STX described as compensation or a sale?

The 3,319 shares tied to 06/11/2026 are labeled in the filing as Restricted Stock Unit Vesting and described as compensation for service, indicating issuance upon vesting rather than an open‑market purchase.

Do the amounts listed include proceeds from the Mosley transactions for STX?

Yes. Each Mosley disposition entry includes gross proceeds: for example, $8,414,638.00 for 20,000 shares on 04/01/2026 and other proceeds for the subsequent lots as listed in the excerpt.

Does the Form 144 excerpt state how the planned 3,319 shares will be sold?

The excerpt specifies the 3,319 shares result from RSU vesting on 06/11/2026 and are compensation for service. It does not specify sale method, broker, or timing for any disposition beyond the vesting date.