Form 144: MOSLEY reports multiple STX 10b5-1 sales

MOSLEY submitted a Form 144 reporting multiple sales of Common stock under a 10b5-1 plan.

Accepted by SEC EDGAR 04/01/2026 - 04:39 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

MOSLEY submitted a Form 144 reporting multiple sales of Common stock under a 10b5-1 plan. The filing lists a 24,584-share sale on 03/19/2026 and three earlier 20,000-share sales on 03/02/2026, 02/02/2026, and 01/02/2026, with proceeds shown for each transaction.

Key Figures

Sale on 03/19/2026: 24,584 shares Sale on 03/02/2026: 20,000 shares Sale on 02/02/2026: 20,000 shares +4 more

7 metrics

Sale on 03/19/2026 24,584 shares proceeds $10,000,033.68

Sale on 03/02/2026 20,000 shares proceeds $7,695,262.00

Sale on 02/02/2026 20,000 shares proceeds $8,585,358.00

Sale on 01/02/2026 20,000 shares proceeds $5,711,244.00

Restricted Stock Units 9,862 awards grant date 09/10/2015

Performance Stock Units 10,029 awards grant date 09/11/2018

Employee Stock Purchase Plan 109 shares grant date 07/31/2018

Key Terms

10b5-1, Restricted Stock Units, Performance Stock Units, Employee Stock Purchase Plan

4 terms

10b5-1 regulatory

"10b5-1 Sales for MOSLEY 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 | 9862 | 09/10/2015"

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 | 10029 | 09/11/2018"

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.

Employee Stock Purchase Plan financial

"Employee Stock Purchase Plan | Issuer | 109 | 07/31/2018"

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 MOSLEY's Form 144 for STX disclose?

The filing discloses 10b5-1 sales of Common stock by MOSLEY, including 24,584 shares on 03/19/2026 and three 20,000-share sales on 03/02/2026, 02/02/2026, and 01/02/2026. Proceeds for each sale are listed in the filing.

Were MOSLEY's sales executed under a trading plan?

Yes. The filing explicitly labels the transactions as "10b5-1 Sales" for MOSLEY. Each listed trade on 01/02/2026, 02/02/2026, 03/02/2026 and 03/19/2026 is identified with that designation.

How much cash did MOSLEY show for the 03/19/2026 sale?

The 03/19/2026 line shows proceeds of $10,000,033.68 for a 24,584-share sale. The filing pairs each sale date with a corresponding proceeds figure in dollars for the reported transactions.

Does the Form 144 list MOSLEY's outstanding equity awards?

Yes. The filing lists award counts: Restricted Stock Units 9,862 (09/10/2015), Performance Stock Units 10,029 (09/11/2018), and Employee Stock Purchase Plan 109 (07/31/2018) with their grant dates.

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

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

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 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	20000	7835200.00	218073067	04/01/2026	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	09/10/2015	Restricted Stock Units	Issuer			9862	09/10/2015	N/A
Common	09/11/2018	Performance Stock Units	Issuer			10029	09/11/2018	N/A
Common	07/31/2018	Employee Stock Purchase Plan	Issuer			109	07/31/2018	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
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
10b5-1 Sales for WILLIAM MOSLEY 121 Woodlands Avenue 5 Singapore U0 739009	Common	02/02/2026	20000	8585358.00
10b5-1 Sales for WILLIAM MOSLEY 121 Woodlands Avenue 5 Singapore U0 739009	Common	01/02/2026	20000	5711244.00

144: Remarks and Signature

Remarks	The securities to be sold were or will be acquired upon the vesting of performance stock units during the period of 09/11/2018 through 09/22/2018. The securities to be sold were acquired upon the vesting of restricted stock units during the period of 09/10/2015 through 09/12/2015.
Date of Notice	04/01/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	02/20/2025
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)