ARM Form 144: Insider proposes ADS sales

ARM Form 144 filing lists proposed sales of American Depositary Shares.

Rhea-AI Filing Summary

ARM Form 144 filing lists proposed sales of American Depositary Shares. The filing shows transactions by Jason E. Child of 21,280 ADS on 03/25/2026 (value $3,157,313.60) and 21,280 ADS on 04/22/2026 (value $3,830,400.00). It also records a Restricted Stock Vesting event on 05/15/2025.

Key Figures

ADS sold (first reported): 21,280 shares Value (first reported): $3,157,313.60 ADS sold (second reported): 21,280 shares +3 more

6 metrics

ADS sold (first reported) 21,280 shares transaction dated 03/25/2026

Value (first reported) $3,157,313.60 associated with 03/25/2026 ADS amount

ADS sold (second reported) 21,280 shares transaction dated 04/22/2026

Value (second reported) $3,830,400.00 associated with 04/22/2026 ADS amount

Restricted stock vesting 31,920 shares Restricted Stock Vesting dated 05/15/2025

Exchange listed NASDAQ exchange referenced in filing header

Key Terms

Form 144, American Depositary Shares, Restricted Stock Vesting, Fidelity Brokerage Services LLC

4 terms

Form 144 regulatory

"144: Securities To Be Sold"

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.

American Depositary Shares financial

"American Depositary Shares | Fidelity Brokerage Services LLC"

American depositary shares (ADSs) are a way for investors in the United States to buy shares of foreign companies without dealing with international markets directly. They represent ownership in a foreign company's stock and are traded on U.S. stock exchanges, making it easier for American investors to buy, sell, and own parts of companies from around the world.

Restricted Stock Vesting financial

"Restricted Stock Vesting | Issuer | 05/15/2025"

Restricted stock vesting is the timetable and conditions under which shares granted to employees or insiders become fully owned and can be sold, typically requiring continued work or meeting performance goals. It matters to investors because large blocks of shares can become tradable at once, which can change share supply and price, and because vesting aligns insiders’ incentives with the company’s long‑term performance—think of it like a timed unlock that both rewards and locks in key people.

Fidelity Brokerage Services LLC other

"Fidelity Brokerage Services LLC 900 Salem Street Smithfield RI 02917"

FAQ

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

What does ARM's Form 144 disclose about insider sales?

Direct answer: The filing discloses proposed sales of American Depositary Shares by an insider. Details: It lists two transactions by Jason E. Child: 21,280 ADS on 03/25/2026 valued at $3,157,313.60 and 21,280 ADS on 04/22/2026 valued at $3,830,400.00.

Who is the reporting party on the ARM Form 144 and what did they report?

Direct answer: The reporting party is Jason E. Child. Details: The filing shows Child associated with two ADS transactions of 21,280 shares each, dated 03/25/2026 and 04/22/2026, with the dollar values shown in the excerpt.

Does the filing show any equity vesting events for ARM?

Direct answer: Yes. Details: The excerpt records a Restricted Stock Vesting event dated 05/15/2025 involving American Depositary Shares and references 31,920 in the related line of the filing.

Which brokerage or transfer agent appears in the ARM Form 144 excerpt?

Direct answer: Fidelity Brokerage Services LLC is named in the excerpt. Details: The filing lists Fidelity Brokerage Services LLC at a Smithfield, RI address in connection with American Depositary Shares and includes NASDAQ as the exchange in the same line.

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

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Accepted by SEC EDGAR 05/20/2026 - 10:55 AM 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	0001533913
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	ARM HOLDINGS PLC /UK
SEC File Number	001-41800
Address of Issuer	110 FULBOURN ROAD CAMBRIDGE UNITED KINGDOM CB1 9NJ
Phone	44 1223 400 400
Name of Person for Whose Account the Securities are To Be Sold	Child Jason
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	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
American Depositary Shares	Fidelity Brokerage Services LLC 900 Salem Street Smithfield RI 02917	31920	7231156.70	1056513738	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 *
American Depositary Shares	05/15/2025	Restricted Stock Vesting	Issuer			31920	05/15/2025	Compensation

* 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
Jason E. Child 110 Fulbourn Road Cambridge X0 Cambridge	American Depositary Shares	03/25/2026	21280	3157313.60
Jason E. Child 110 Fulbourn Road, Cambridge X0 CB1 9NJ	American Depositary Shares	04/22/2026	21280	3830400.00

144: Remarks and Signature

Remarks
Date of Notice	05/20/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	05/30/2025
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/ Daniel Tucci, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Jason Child
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)