Arm Holdings (ARM) CCO sells 4,655 Ordinary Shares in open market

Rhea-AI Filing Summary

Arm Holdings Chief Commercial Officer William Abbey reported an open-market sale of Ordinary Shares held as American Depositary Shares. On May 21, 2026, he sold 4,655 shares and received a weighted average price within a range of $287.02 to $287.15 per share. Following this transaction, Abbey directly holds 33,629 Ordinary Shares.

Insider Trade Summary

Net Seller: 4,655 shares ($1,336,125)

Net Sell 1 txn

Insider Abbey William

Role Chief Commercial Officer

Sold 4,655 shs ($1.34M)

Type	Security	Shares	Price	Value
Sale	Ordinary Shares	4,655	$287.03	$1.34M

Holdings After Transaction: Ordinary Shares — 33,629 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. Represents weighted average sales price. The shares were sold at prices ranging from $287.02 to $287.15. The reporting person will provide upon request, to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price.

Key Figures

Shares sold: 4,655 shares Post-transaction holdings: 33,629 shares Sale price range: $287.02–$287.15 per share +2 more

5 metrics

Shares sold 4,655 shares Ordinary Shares sold on May 21, 2026

Post-transaction holdings 33,629 shares Ordinary Shares held directly after sale

Sale price range $287.02–$287.15 per share Weighted average sale prices disclosed in footnote

Security type Ordinary Shares via ADSs Each ADS represents 1 Ordinary Share

Transaction code S Sale in open market or private transaction

Key Terms

open-market sale, Ordinary Shares, American Depositary Shares, weighted average sales price

4 terms

open-market sale financial

"transaction_action is described as an 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

"security title is listed as Ordinary Shares in the filing"

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.

American Depositary Shares financial

"Ordinary Shares are 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.

weighted average sales price financial

"footnote states the trade used a weighted average sales price"

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).

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^*

Abbey William

(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 Commercial Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/21/2026

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)	05/21/2026		S		4,655	D	$287.03(2)	33,629	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. Represents weighted average sales price. The shares were sold at prices ranging from $287.02 to $287.15. The reporting person will provide upon request, to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price.

Remarks:

	/s/ George Kanelos, as Attorney-in-Fact for William Abbey	05/22/2026
	** 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 Holdings (ARM) report for William Abbey?

Arm Holdings reported that Chief Commercial Officer William Abbey completed an open-market sale of 4,655 Ordinary Shares on May 21, 2026. These shares are held as American Depositary Shares, and the transaction is disclosed in a Form 4 insider filing.

How many Arm Holdings (ARM) shares did William Abbey sell and at what price range?

William Abbey sold 4,655 Ordinary Shares of Arm Holdings in an open-market transaction. The weighted average sale price was based on trades executed between $287.02 and $287.15 per share, according to the Form 4 footnote disclosure.

How many Arm Holdings (ARM) shares does William Abbey hold after this Form 4 sale?

After the reported sale, William Abbey directly holds 33,629 Ordinary Shares of Arm Holdings. This post-transaction ownership figure is shown in the Form 4 as the total number of Ordinary Shares beneficially owned following the transaction.

What type of security did William Abbey trade in the Arm Holdings (ARM) Form 4?

The Form 4 shows Abbey traded Ordinary Shares of Arm Holdings, each represented by an American Depositary Share. The filing clarifies that each ADS corresponds to one Ordinary Share with a nominal value of 0.001 GBP per share.

Was William Abbey’s Arm Holdings (ARM) transaction an open-market sale or another type?

The transaction is classified as an open-market sale of non-derivative Ordinary Shares. The Form 4 uses transaction code “S” and describes it as a sale in an open market or private transaction, confirming it as a standard share disposition.