ARM (ARM) CFO Jason Child sells 31,920 shares, retains 174,232 stake

Rhea-AI Filing Summary

ARM Holdings Chief Financial Officer Jason Child sold 31,920 Ordinary Shares in open-market transactions at a price of $226.54 per share. The shares are held in the form of American Depositary Shares, with each ADS representing one Ordinary Share.

After the sale, Child still holds 174,232 Ordinary Shares, showing he maintains a significant remaining stake in the company. The transaction was executed under a pre-arranged Rule 10b5-1 trading plan adopted by the reporting person, indicating the sale was scheduled in advance rather than timed opportunistically.

Insider Trade Summary 10b5-1

Net Seller: 31,920 shares ($7,231,157)

Net Sell 1 txn

Insider Child Jason

Role Chief Financial Officer

Sold 31,920 shs ($7.23M)

Type	Security	Shares	Price	Value
Sale	Ordinary Shares	31,920	$226.54	$7.23M

Holdings After Transaction: Ordinary Shares — 174,232 shares (Direct, null)

Footnotes (1)

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. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 30, 2025.

Key Figures

Shares sold: 31,920 shares Sale price: $226.54 per share Shares held after sale: 174,232 shares +2 more

5 metrics

Shares sold 31,920 shares Ordinary Shares sold in open-market transaction

Sale price $226.54 per share Price for the reported open-market sale

Shares held after sale 174,232 shares Direct Ordinary Share holdings following transaction

ADS to Ordinary Share ratio 1 ADS : 1 Ordinary Share Each ADS represents one Ordinary Share

Transaction date 2026-05-20 Date of the reported open-market sale

Key Terms

Rule 10b5-1 trading plan, American Depositary Shares, open-market sale, Ordinary Shares, +1 more

5 terms

Rule 10b5-1 trading plan regulatory

"The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person"

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

"Ordinary Shares are held in the form of American Depositary Shares ("ADSs"). Each ADS represents 1 Ordinary Share."

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.

open-market sale financial

"transaction_action": "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

Ordinary Shares financial

"Ordinary shares, nominal value 0.001 GBP per share ("Ordinary Shares")"

Ordinary shares are a type of ownership stake in a company, giving shareholders a right to participate in the company’s profits and decision-making through voting. They are similar to owning a piece of a business, and their value can rise or fall based on the company's performance. Investors buy ordinary shares to potentially earn dividends and benefit from the company's growth over time.

Form 4 regulatory

"INSIDER FILING DATA (Form 4)"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

Form 4 Insider Transactions: What Each Field Means →

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)
05/20/2026

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)	05/20/2026		S(2)		31,920	D	$226.54	174,232	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	05/21/2026
	** 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 insider transaction did ARM (ARM) disclose for Jason Child?

ARM disclosed that Chief Financial Officer Jason Child sold 31,920 Ordinary Shares in an open-market transaction at $226.54 per share. Following the sale, he continues to hold 174,232 Ordinary Shares, so this filing reflects a partial reduction, not a full exit, of his position.

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

Jason Child sold 31,920 ARM Ordinary Shares at $226.54 per share. This price applies to the reported open-market sale, which was carried out under a pre-arranged Rule 10b5-1 trading plan rather than as a discretionary, unscheduled trade.

How many ARM (ARM) shares does Jason Child hold after the reported sale?

After selling 31,920 Ordinary Shares, Jason Child holds 174,232 Ordinary Shares of ARM. This remaining balance is reported as a direct ownership position, indicating he continues to have substantial equity exposure to the company following the transaction.

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

Yes. The filing states the transaction was executed under a Rule 10b5-1 trading plan adopted by Jason Child. Such plans schedule trades in advance, which generally makes the timing less informative about the insider’s short-term view of the stock.

What type of ARM (ARM) security did Jason Child sell in this Form 4?

Jason Child sold ARM Ordinary Shares that are held in the form of American Depositary Shares (ADSs). The filing specifies that each ADS represents one Ordinary Share, so the reported 31,920 shares sold correspond to 31,920 ADSs as well.