Arm officer may sell $3.1M in ADS on NASDAQ

Rhea-AI Filing Summary

ARM HOLDINGS PLC /UK (ARM) received a notice under Rule 144 that officer Jason E. Child, through Fidelity Brokerage Services LLC as attorney-in-fact, may sell up to 10,400 American Depositary Shares on NASDAQ, with an indicated aggregate market value of $3,120,000 as of September 21, 2026.

The notice states these shares relate to restricted stock that vested on May 15, 2024 (4,290 ADS) and May 15, 2025 (6,110 ADS). It also reports that during the prior three months, Child sold 10,400 ADS on August 27, 2026 for an aggregate value of $2,655,432.

Key Figures

Proposed shares to be sold: 10,400 American Depositary Shares Aggregate market value of proposed sale: $3,120,000 Shares sold in prior 3 months: 10,400 American Depositary Shares +3 more

6 metrics

Proposed shares to be sold 10,400 American Depositary Shares Potential sale under Rule 144 listed with sale date September 21, 2026

Aggregate market value of proposed sale $3,120,000 Value associated with 10,400 ADS for the potential Rule 144 sale

Shares sold in prior 3 months 10,400 American Depositary Shares Shares sold on August 27, 2026 as reported in the 3‑month history

Aggregate value of prior sale $2,655,432 Aggregate value for 10,400 ADS sold on August 27, 2026

Restricted stock vesting 2024 4,290 American Depositary Shares Shares from restricted stock vesting on May 15, 2024

Restricted stock vesting 2025 6,110 American Depositary Shares Shares from restricted stock vesting on May 15, 2025

Key Terms

Rule 144, American Depositary Shares, Restricted Stock Vesting, attorney-in-fact

4 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

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.

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

"05/15/2024 | Restricted Stock Vesting | Issuer"

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.

attorney-in-fact regulatory

"as attorney-in-fact for Jason E. Child"

An attorney-in-fact is the person or entity given legal authority through a power of attorney to act on behalf of another for specific tasks, such as signing documents, voting shares, or handling transactions. For investors, this matters because it lets a trusted representative make timely decisions or complete paperwork when the owner cannot, much like handing keys to someone to run errands on your behalf—so checks on scope and limits of that authority are important.

FAQ

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

What insider transaction is disclosed for ARM in this Form 144?

The notice reports that officer Jason E. Child, via Fidelity Brokerage Services LLC, may sell up to 10,400 American Depositary Shares of ARM on NASDAQ under Rule 144, with an indicated aggregate market value of $3,120,000 as of September 21, 2026.

What type of ARM (ARM) securities are covered by this Form 144?

The filing covers American Depositary Shares of ARM HOLDINGS PLC /UK, to be sold through Fidelity Brokerage Services LLC on NASDAQ, subject to Rule 144 conditions.

How many ARM (ARM) shares were sold by the insider in the last 3 months?

The filing states that 10,400 American Depositary Shares were sold on August 27, 2026, for an aggregate value of $2,655,432 during the prior three months.

What is the origin of the ARM (ARM) shares to be sold under this Form 144?

The notice attributes the shares to restricted stock vesting, including 4,290 ADS that vested on May 15, 2024 and 6,110 ADS that vested on May 15, 2025, both from the issuer as compensation.

Who is acting for the ARM (ARM) insider in this Form 144 sale?

The form is signed by /s/ Wade Moss as a duly authorized representative of Fidelity Brokerage Services LLC, acting as attorney-in-fact for Jason E. Child in connection with the proposed Rule 144 sales.

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

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Available on EDGAR 09/21/2026 - 11:45 AM Accepted by SEC EDGAR 09/21/2026 - 11:44 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	10400	3120000.00	1064055252	09/21/2026	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	05/15/2024	Restricted Stock Vesting	Issuer			4290	05/15/2024	Compensation
American Depositary Shares	05/15/2025	Restricted Stock Vesting	Issuer			6110	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 CB1 9NJ	American Depositary Shares	08/27/2026	10400	2655432.00

144: Remarks and Signature

Remarks
Date of Notice	09/21/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	05/22/2026
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/Wade Moss, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Jason E. Child
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)