Arm (ARM) CFO sells 21,280 shares, retains 174,706 stake

Rhea-AI Filing Summary

ARM Holdings PLC Chief Financial Officer Jason Child sold 21,280 Ordinary Shares in an open-market transaction. The sale was executed at an average price of $148.37 per share. After this transaction, he directly holds 174,706 Ordinary Shares.

The shares are held as American Depositary Shares, with each ADS representing one Ordinary Share. The transaction was carried out under a pre-arranged Rule 10b5-1 trading plan adopted by Child on May 30, 2025, indicating the sale was scheduled in advance.

Insights

Equity compensation and insider-trading analyst

Arm’s CFO executed a pre-planned sale of a modest portion of his holdings.

Chief Financial Officer Jason Child sold 21,280 Ordinary Shares of ARM Holdings PLC at $148.37 per share in an open-market transaction. This is a direct, non-derivative sale rather than an option exercise or restructuring move.

The filing shows Child retaining 174,706 Ordinary Shares after the sale, so the transaction represents only a portion of his overall stake. A footnote states the sale was made under a Rule 10b5-1 trading plan adopted on May 30, 2025, suggesting the timing was pre-scheduled rather than discretionary.

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)
03/25/2026

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)	03/25/2026		S(2)		21,280	D	$148.37	174,706	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 30, 2025.

Remarks:

	/s/ George Kanelos, as Attorney-in-Fact for Jason Child	03/27/2026
	** 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)

FAQ

What did ARM (ARM) CFO Jason Child do in this Form 4 filing?

ARM CFO Jason Child reported an open-market sale of 21,280 Ordinary Shares. The shares were sold at an average price of $148.37 each, and the transaction involved non-derivative stock directly owned by him rather than options or other derivative securities.

How many ARM (ARM) shares does the CFO still hold after the sale?

After the reported sale, Jason Child directly holds 174,706 Ordinary Shares of ARM. This post-transaction balance shows he retains a substantial equity position, with the 21,280 shares sold representing only a portion of his overall direct holdings in the company.

At what price did ARM (ARM) CFO Jason Child sell his shares?

Jason Child’s reported sale price was an average of $148.37 per Ordinary Share. This price applies to the full block of 21,280 shares sold in the open market, according to the Form 4 transaction details describing a non-derivative, direct ownership sale.

Was the ARM (ARM) CFO’s share sale under a Rule 10b5-1 plan?

Yes. A footnote states the transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by Jason Child on May 30, 2025. Such plans pre-schedule trades, indicating the sale’s timing was arranged in advance rather than based on short-term developments.

What type of ARM (ARM) security did the CFO sell in this transaction?

The transaction involved Ordinary Shares of ARM, held in the form of American Depositary Shares (ADSs). A footnote explains that each ADS represents one Ordinary Share, so the 21,280 shares sold correspond to the same number of ADSs in the market.