Arm CFO sells 10,400 shares at $255.33 each

Rhea-AI Filing Summary

ARM HOLDINGS PLC (ARM) Chief Financial Officer Jason Child reported selling 10,400 Ordinary Shares (held as ADSs, each representing 1 Ordinary Share) on August 27, 2026 at a price of $255.33 per share. Following this Rule 10b5-1 plan trade, he directly holds 163,832 Ordinary Shares.

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 ($2.66M)

Type	Security	Shares	Price	Value
Sale	Ordinary Shares F1, F2	10,400	$255.33	$2.66M

Holdings After Transaction: Ordinary Shares — 163,832 shares (Direct)

Footnotes (2)

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.

Key Figures

Shares sold: 10,400 Ordinary Shares Sale price per share: $255.33 per share Shares held after transaction: 163,832 Ordinary Shares +2 more

5 metrics

Shares sold 10,400 Ordinary Shares Non-derivative sale on August 27, 2026

Sale price per share $255.33 per share Open market or private sale of Ordinary Shares

Shares held after transaction 163,832 Ordinary Shares Direct ownership following August 27, 2026 sale

ADS-to-Ordinary Share ratio 1 ADS = 1 Ordinary Share Structure of ARM Holdings PLC equity as reported

Rule 10b5-1 trading plan adoption date May 22, 2026 Plan governing the reported sale

Key Terms

Rule 10b5-1 trading plan, American Depositary Shares, Ordinary Shares

3 terms

Rule 10b5-1 trading plan regulatory

"The reported transaction was 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

"are held in the form of American Depositary Shares ("ADSs")"

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.

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.

FAQ

What insider transaction did ARM (ARM) CFO Jason Child report?

Jason Child reported a sale of 10,400 Ordinary Shares of ARM on August 27, 2026, at $255.33 per share, leaving him with 163,832 Ordinary Shares held directly.

At what price did the ARM (ARM) shares sell in Jason Child’s Form 4 filing?

The reported transaction shows a sale price of $255.33 per share for 10,400 Ordinary Shares of ARM on August 27, 2026.

How many ARM (ARM) shares does Jason Child hold after this Form 4 transaction?

After the reported sale, Jason Child directly holds 163,832 Ordinary Shares of ARM, as disclosed in the Form 4 filing.

Were Jason Child’s ARM (ARM) share sales under a Rule 10b5-1 trading plan?

Yes. The Form 4 states the sale was effected pursuant to a Rule 10b5-1 trading plan adopted by Jason Child on May 22, 2026.

How are ARM (ARM) Ordinary Shares held in Jason Child’s reported transaction?

The filing explains that ARM Ordinary Shares are held in the form of American Depositary Shares (ADSs), with each ADS representing 1 Ordinary Share.

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Available on EDGAR 08/31/2026 - 05:07 PM Accepted by SEC EDGAR 08/31/2026 - 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)
08/27/2026

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)	08/27/2026		S(2)		10,400	D	$255.33	163,832	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.

Remarks:

	/s/ George Kanelos, as Attorney-in-Fact for Jason Child	08/31/2026
	** 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)