Arm Holdings CFO Jason Child sells 10,400 shares

The chief financial officer reported 153,442 ordinary shares after the sale; that total includes 10 shares acquired under the employee stock purchase plan on August 31, 2026.

Rhea-AI Filing Summary

ARM Holdings plc Chief Financial Officer Jason Child reported a sale of 10,400 ordinary shares on September 21, 2026, at 300 per share. The ordinary shares are held in the form of American Depositary Shares, with each ADS representing one ordinary share. The sale was made under a Rule 10b5-1 trading plan adopted on May 22, 2026. His reported direct holdings afterward were 153,442 ordinary shares, including 10 shares acquired under the 2024 Employee Stock Purchase Plan on August 31, 2026.

Insider Trade Summary 10b5-1

Net Seller: 10,400 shares

Net Sell 1 txn

Insider Child Jason

Role Chief Financial Officer

Sold 10,400 shs ($3.12M)

Type	Security	Shares	Price	Value
Sale	Ordinary Shares F1, F2, F3	10,400	$300.00	$3.12M

Holdings After Transaction: Ordinary Shares — 153,442 shares (Direct)

Footnotes (3)

1. F1. Ordinary shares, nominal value 0.001 GBP per share ("Ordinary Shares"), are held in the form of American Depositary Shares ("ADSs"). Each ADS represents 1 Ordinary Share.
2. F2. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 22, 2026.
3. F3. Includes 10 ordinary shares acquired under the Arm Holdings plc 2024 Employee Stock Purchase Plan on August 31, 2026.

Key Figures

Ordinary shares sold: 10,400 ordinary shares Sale price: 300 per share Direct holdings after transaction: 153,442 ordinary shares +1 more

4 metrics

Ordinary shares sold 10,400 ordinary shares Sale on September 21, 2026

Sale price 300 per share Sale on September 21, 2026

Direct holdings after transaction 153,442 ordinary shares Following the sale on September 21, 2026

Employee Stock Purchase Plan shares acquired 10 ordinary shares Acquired on August 31, 2026; included in reported direct holdings

Key Terms

Rule 10b5-1 trading plan, American Depositary Shares, Employee Stock Purchase Plan

3 terms

Rule 10b5-1 trading plan regulatory

"effected pursuant to a Rule 10b5-1 trading plan"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

American Depositary Shares financial

"held in the form of American Depositary Shares"

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.

Employee Stock Purchase Plan financial

"acquired under the Arm Holdings plc 2024 Employee Stock Purchase Plan"

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.

How many ARM shares did the CFO sell, and at what price?

Jason Child, ARM's chief financial officer, sold 10,400 ordinary shares on September 21, 2026, at 300 per share. The ordinary shares are held in the form of ADSs, with each ADS representing one ordinary share.

Was the ARM CFO's share sale made under a 10b5-1 plan?

Yes. Jason Child's sale was made under a Rule 10b5-1 trading plan he adopted on May 22, 2026.

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

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Available on EDGAR 09/23/2026 - 05:06 PM Accepted by SEC EDGAR 09/23/2026 - 05:06 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

X

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Child Jason

(Last) (First) (Middle)

C/O ARM HOLDINGS PLC

110 FULBOURN ROAD

(Street)

CAMBRIDGE CB1 9NJ

(City) (State) (Zip)

UNITED KINGDOM

(Country)

2. Issuer Name and Ticker or Trading Symbol
ARM HOLDINGS PLC /UK [ ARM ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Financial Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/21/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Ordinary Shares(1)	09/21/2026		S(2)		10,400	D	$300	153,442(3)	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Ordinary shares, nominal value 0.001 GBP per share ("Ordinary Shares"), are held in the form of American Depositary Shares ("ADSs"). Each ADS represents 1 Ordinary Share.

2. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 22, 2026.

3. Includes 10 ordinary shares acquired under the Arm Holdings plc 2024 Employee Stock Purchase Plan on August 31, 2026.

Remarks:

	/s/ George Kanelos, as Attorney-in-Fact for Jason Child	09/23/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)