Form 144: 1,580 STX Shares Proposed for Resale

Filer reports a proposed sale of Common Stock under Rule 144.

Rhea-AI Filing Summary

Filer reports a proposed sale of Common Stock under Rule 144. The filing lists 1,580 shares of Common stock tied to restricted stock vesting under a registered plan (grant date 10/21/2020). The filing record shows a submission date of 05/05/2026 and identifies the broker as Morgan Stanley Smith Barney LLC Executive Financial Services.

Insights

Securities Compliance Specialist

Rule 144 notice for shares vested from a registered plan; routine transfer filing.

The submission documents a proposed resale of 1,580 shares that vested under a registered plan on 10/21/2020. The entry lists the broker and a filing date of 05/05/2026, consistent with a notice of intended sale rather than an open-market trade report.

Practical dependencies include compliance with Rule 144 holding and volume conditions and broker processing. Subsequent Form 4/Form 5 or trade confirmations would show actual sale execution and proceeds.

Key Figures

Shares proposed for resale: 1,580 shares Filing date: 05/05/2026 Broker: Morgan Stanley Smith Barney LLC +2 more

5 metrics

Shares proposed for resale 1,580 shares tied to restricted stock vesting on <date>10/21/2020</date>

Filing date 05/05/2026 Form 144 submission date listed in the document

Broker Morgan Stanley Smith Barney LLC executing broker recorded on the Form 144

Grant/Vest date 10/21/2020 date of restricted stock vesting under a registered plan

Documented numeric entry 1211249.96 numeric field present in the filing excerpt (exact label not shown)

Key Terms

restricted stock vesting under a registered plan, Form 144, Rule 144

3 terms

restricted stock vesting under a registered plan regulatory

"Restricted stock vesting under a registered plan"

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 144 regulatory

"Securities To Be Sold | Common | Restricted stock vesting under a registered plan"

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.

FAQ

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

What does the STX Form 144 report show?

It reports a proposed resale of 1,580 shares of Common Stock related to restricted stock vesting on 10/21/2020. The filing names Morgan Stanley Smith Barney LLC as the executing broker and lists 05/05/2026 as the filing date.

Does the Form 144 indicate the sale already occurred for STX?

No, the filing is a notice of intended sale under Rule 144 for 1,580 shares. It does not state that a sale has been executed; post-sale forms or confirmations would show completion and proceeds.

Why is 'restricted stock vesting under a registered plan' listed on the STX filing?

That phrase identifies the source of the shares: they vested under a registered plan on 10/21/2020. It indicates the shares originated from a compensation or benefit plan eligible for resale under Rule 144 conditions.

Who is the broker named on the STX Form 144?

The filing lists Morgan Stanley Smith Barney LLC Executive Financial Services at 1 New York Plaza, which is recorded as the broker handling the proposed transaction on the Form 144.

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

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Accepted by SEC EDGAR 05/05/2026 - 04:01 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	0001534995
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	(65) 6018-2562
Name of Person for Whose Account the Securities are To Be Sold	STEPHANIE TILENIUS
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

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	1580	1211249.96	224228992	05/05/2026	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	10/21/2020	Restricted stock vesting under a registered plan	Issuer			1580	10/21/2020	Not Applicable

* 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

Nothing to Report

144: Remarks and Signature

Remarks
Date of Notice	05/05/2026
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/ Stephanie Tilenius
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)