Form 144: 90,000 STX Shares Notified for Resale

Morgan Stanley Smith Barney LLC Executive Financial Services files a Form 144 notice reporting proposed resale of common stock and recent 10b5-1 dispositions by Mosley.

Rhea-AI Filing Summary

Morgan Stanley Smith Barney LLC Executive Financial Services files a Form 144 notice reporting proposed resale of common stock and recent 10b5-1 dispositions by Mosley. The filing lists 90,000 shares associated with the notice and itemizes specific securities: 42,000 shares from option exercises, 47,468 RSUs, and 532 shares from an ESPP.

The excerpt also records 10b5-1 sales by Mosley on 05/20/2026 (30,000 shares for $22,538,568.00), 04/01/2026 (20,000 shares for $8,414,638.00), 03/19/2026 (24,584 shares for $10,000,033.68), and 03/02/2026 (20,000 shares for $7,695,262.00).

Insights

Securities Counsel

Form 144 notifies the SEC of intended resale and documents recent Rule 10b5-1 sales.

The filing lists proposed resale quantities including 90,000 shares tied to option exercises, RSUs, and ESPP issuances. It also records multiple 10b5-1 dispositions by Mosley across 03/02/2026 to 05/20/2026.

These entries are procedural notices required before public resale; cash‑flow treatment is determined by actual trades and is described for past sales with gross proceeds in the excerpt.

Key Figures

Proposed resale: 90,000 shares Option exercise shares: 42,000 shares RSUs listed: 47,468 shares +4 more

7 metrics

Proposed resale 90,000 shares Form 144 notice aggregate listed at top of excerpt

Option exercise shares 42,000 shares Listed under "Securities To Be Sold" as "Exercise of Stock Options"

RSUs listed 47,468 shares Listed under "Restricted and Performance Stock Units" dated 10/30/2013

ESPP shares 532 shares Listed under "Employee Stock Purchase Plan" dated 01/30/2015

10b5-1 sale on 05/20/2026 30,000 shares for $22,538,568.00 Recorded past sale by Mosley

10b5-1 sale on 03/19/2026 24,584 shares for $10,000,033.68 Recorded past sale by Mosley

10b5-1 sale on 04/01/2026 20,000 shares for $8,414,638.00 Recorded past sale by Mosley

Key Terms

Form 144, Rule 10b5-1, Restricted and Performance Stock Units, Employee Stock Purchase Plan

4 terms

Form 144 regulatory

"Filer Information | 144: Filer Information"

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.

Rule 10b5-1 regulatory

"10b5-1 Sales for MOSLEY 121 Woodlands Avenue 5 Singapore"

Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.

Restricted and Performance Stock Units financial

"Restricted and Performance Stock Units | Issuer | 47468"

Employee Stock Purchase Plan financial

"Employee Stock Purchase Plan | Issuer | 532"

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.

FAQ

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

What does the STX Form 144 disclose about shares being sold?

The filing lists a proposed resale of 90,000 shares tied to option exercises, RSUs, and an ESPP. It itemizes 42,000 from option exercises, 47,468 RSUs, and 532 ESPP shares in the excerpt.

Who executed recent 10b5-1 sales shown in the Form 144 excerpt?

The excerpt shows multiple 10b5-1 sales by Mosley on specified dates. Sales included 30,000 shares on 05/20/2026 and other transactions in March and April 2026 with disclosed gross proceeds.

How much cash did recent Mosley 10b5-1 sales generate?

Reported gross proceeds in the excerpt include $22,538,568.00 for 30,000 shares on 05/20/2026 and $10,000,033.68 for 24,584 shares on 03/19/2026, among other entries.

Does this Form 144 mean the company issued new shares?

No. The filing documents proposed resale of existing securities by holders and lists securities issuable from prior grants and plans; it does not state that the company issued new shares in this excerpt.

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

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Accepted by SEC EDGAR 06/01/2026 - 04:36 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	0001388390
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	WILLIAM D. MOSLEY
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	Director
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	90000	79182000.00	224228992	06/01/2026	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	06/01/2026	Exercise of Stock Options	Issuer			42000	06/01/2026	Cash
Common	10/30/2013	Restricted and Performance Stock Units	Issuer			47468	10/30/2013	N/A
Common	01/30/2015	Employee Stock Purchase Plan	Issuer			532	01/30/2015	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
10b5-1 Sales for WILLIAM MOSLEY 121 Woodlands Avenue 5 Singapore U0 739009	Common	05/20/2026	30000	22538568.00
10b5-1 Sales for WILLIAM MOSLEY 121 Woodlands Avenue 5 Singapore U0 739009	Common	04/01/2026	20000	8414638.00
WILLIAM MOSLEY 121 Woodlands Avenue 5 Singapore U0 739009	Common	03/19/2026	24584	10000033.68
10b5-1 Sales for WILLIAM MOSLEY 121 Woodlands Avenue 5 Singapore U0 739009	Common	03/02/2026	20000	7695262.00

144: Remarks and Signature

Remarks	The 42,000 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 47,468 securities to be sold were acquired upon the vesting of restricted and performance stock units during the period of 10/30/2013 through 06/11/2025. The 532 securities to be sold were acquired upon the vesting of employee stock purchase plan during the period of 01/30/2015 through 07/31/2025.
Date of Notice	06/01/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	02/18/2026
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/ William D. Mosley
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)