Affiliate files Form 144 to sell common shares

Affiliate files proposed sale notice under Form 144 for STX common stock.

Rhea-AI Filing Summary

Affiliate files proposed sale notice under Form 144 for STX common stock. The filing lists planned issuer-related transactions and recent 10b5-1 sales by an affiliate. It records proposed sales tied to an exercise of stock options for 14,000 shares on 05/20/2026 and previously issued RSU/PSU-related 16,000 shares (10/13/2013). The excerpt also shows three 10b5-1 dispositions: 20,000 shares on 04/01/2026 for $8,414,638.00, 24,584 shares on 03/19/2026 for $10,000,033.68, and 20,000 shares on 03/02/2026 for $7,695,262.00.

Insights

Securities Compliance Analyst

Form 144 lists proposed affiliate sales and recent 10b5-1 dispositions.

The filing fragment documents an affiliate notice to sell common stock, including an exercise of options for 14,000 shares effective 05/20/2026 and RSU/PSU-related shares from 10/13/2013. It also records three executed 10b5-1 sales with exact share counts and proceeds.

Timing and proceeds for the proposed sales are presented as transaction-line items; cash‑flow recipients are not explicitly stated beyond the listed proceeds for executed 10b5-1 trades. Subsequent filings or broker confirmations would show settlement details and whether the proposed sales were completed.

Key Figures

Proposed option exercise: 14,000 shares RSU & PSU shares: 16,000 shares 10b5-1 sale — 04/01/2026: 20,000 shares +2 more

5 metrics

Proposed option exercise 14,000 shares exercise of stock options on <date>05/20/2026</date>

RSU & PSU shares 16,000 shares RSU & PSUs grant date <date>10/13/2013</date>

10b5-1 sale — 04/01/2026 20,000 shares proceeds <money>$8,414,638.00</money> on <date>04/01/2026</date>

10b5-1 sale — 03/19/2026 24,584 shares proceeds <money>$10,000,033.68</money> on <date>03/19/2026</date>

10b5-1 sale — 03/02/2026 20,000 shares proceeds <money>$7,695,262.00</money> on <date>03/02/2026</date>

Key Terms

Form 144, 10b5-1, RSU & PSUs, Exercise of Stock Options

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.

10b5-1 regulatory

"144: Securities Sold During The Past 3 Months | 10b5-1 Sales for MOSLEY"

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.

RSU & PSUs financial

"Common | 10/13/2013 | RSU & PSUs"

Exercise of Stock Options financial

"Common | 05/20/2026 | Exercise of Stock Options"

FAQ

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

What does the Form 144 for STX report?

It reports proposed affiliate sales and recent dispositions. The excerpt lists a proposed exercise sale of 14,000 shares on 05/20/2026 and three prior 10b5-1 sales with shares and proceeds.

How many shares were sold under 10b5-1 plans in the excerpt?

The excerpt lists three sales totaling 64,584 shares: 20,000 on 04/01/2026, 24,584 on 03/19/2026, and 20,000 on 03/02/2026.

What proceeds were reported for the 10b5-1 sales in STX's excerpt?

The filing shows proceeds of $8,414,638.00 (04/01/2026), $10,000,033.68 (03/19/2026), and $7,695,262.00 (03/02/2026) for the respective 10b5-1 transactions.

Does the excerpt show shares issued from equity awards?

Yes. It lists 16,000 shares tied to RSU & PSUs with an original grant date of 10/13/2013 and an exercise of stock options for 14,000 shares on 05/20/2026.

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

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Accepted by SEC EDGAR 05/20/2026 - 04:39 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 plc
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	30000	22000500.00	224228992	05/20/2026	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	05/20/2026	Exercise of Stock Options	Issuer			14000	05/20/2026	Cash
Common	10/13/2013	RSU & PSUs	Issuer			16000	10/13/2013	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
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 securities to be sold were acquired upon the vesting of restricted stock units and performance stock units during the period of 10/13/2013 through 3/11/2026.
Date of Notice	05/20/2026
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)