Arm Holdings (ARM) CFO Jason Child reports initial share and RSU holdings

Rhea-AI Filing Summary

Arm Holdings plc Chief Financial Officer Jason Child reported his initial ownership of company equity. He holds restricted stock units (RSUs) covering 108,015, 15,568 and 10,843 underlying Ordinary Shares, each RSU convertible into one Ordinary Share with a nominal value of 0.001 GBP. He also directly owns 195,986 Ordinary Shares, held in the form of American Depositary Shares, with each ADS representing one Ordinary Share. The RSU grants were made on May 13, 2024, May 1, 2025 and December 9, 2025, and will vest in tranches between May 15, 2026 and November 15, 2028, subject to his continued service with the company.

Insider Trade Summary

4 transactions reported

Mixed 4 txns

Insider Child Jason

Role Chief Financial Officer

Type	Security	Shares	Price	Value
holding	Restricted Stock Units	--	--	--
holding	Restricted Stock Units	--	--	--
holding	Restricted Stock Units	--	--	--
holding	Ordinary Shares	--	--	--

Holdings After Transaction: Restricted Stock Units — 108,015 shares (Direct); Ordinary Shares — 195,986 shares (Direct)

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. This restricted stock unit ("RSU") award was granted on December 9, 2025. 30% will vest on each of November 15, 2026, and November 15, 2027, and the remaining 40% will vest on November 15, 2028, subject to continued service to Arm Holdings plc (the "Company"). Each RSU represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS. This RSU award was granted on May 1, 2025. 30% will vest on each of May 15, 2026 and May 15, 2027, and the remaining 40% will vest on May 15, 2028, subject to continued service to the Company. This RSU award of 15,490 was granted on May 13, 2024, of which 30% already vested on May 15, 2025. 30% will vest on May 15, 2026 and 40% will vest on May 15, 2027, subject to continued service to the Company.

Understanding Insider Trading Forms →

SEC Form 3

FORM 3

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

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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:			3235-0104
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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 STATES

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
03/18/2026

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

3a. Foreign Trading Symbol

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

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

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

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

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

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Ordinary Shares(1)	195,986	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Units	(2)	(2)	Ordinary Shares(1)	108,015	(3)	D
Restricted Stock Units	(4)	(4)	Ordinary Shares(1)	15,568	(3)	D
Restricted Stock Units	(5)	(5)	Ordinary Shares(1)	10,843	(3)	D

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. This restricted stock unit ("RSU") award was granted on December 9, 2025. 30% will vest on each of November 15, 2026, and November 15, 2027, and the remaining 40% will vest on November 15, 2028, subject to continued service to Arm Holdings plc (the "Company").

3. Each RSU represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

4. This RSU award was granted on May 1, 2025. 30% will vest on each of May 15, 2026 and May 15, 2027, and the remaining 40% will vest on May 15, 2028, subject to continued service to the Company.

5. This RSU award of 15,490 was granted on May 13, 2024, of which 30% already vested on May 15, 2025. 30% will vest on May 15, 2026 and 40% will vest on May 15, 2027, subject to continued service to the Company.

Remarks:

Exhibit 24 - Power of Attorney

	/s/ George Kanelos, as Attorney-in-Fact for Jason Child	03/18/2026
	** 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 5 (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 3: SEC 1473 (03-26)

FAQ

What insider position did ARM CFO Jason Child report on this Form 3?

Jason Child reported his initial equity holdings as Chief Financial Officer of Arm Holdings plc (ARM). He holds multiple restricted stock unit awards and directly owns 195,986 Ordinary Shares, giving investors visibility into his current stake in the company.

How many Arm Holdings RSUs does Jason Child hold according to this filing?

The filing shows Jason Child holding three RSU awards tied to 108,015, 15,568 and 10,843 underlying Ordinary Shares. Each RSU represents the right to receive one Ordinary Share, delivered in the form of an American Depositary Share after vesting.

What Arm Holdings ordinary share holdings did Jason Child disclose?

Jason Child disclosed direct ownership of 195,986 Ordinary Shares of Arm Holdings plc. These Ordinary Shares, with a nominal value of 0.001 GBP per share, are held as American Depositary Shares, with each ADS representing one Ordinary Share.

What are the vesting schedules for Jason Child’s Arm Holdings RSU grants?

The RSUs granted on May 13, 2024, May 1, 2025 and December 9, 2025 vest in tranches between May 15, 2026 and November 15, 2028. Vesting is contingent on Jason Child’s continued service with Arm Holdings.

How do Arm Holdings ADSs relate to Ordinary Shares in this insider filing?

Arm Holdings Ordinary Shares are held in the form of American Depositary Shares (ADSs). Each ADS represents one Ordinary Share, so Jason Child’s reported Ordinary Share and RSU positions translate directly into equivalent ADS holdings.

Do Jason Child’s Arm RSUs require a cash exercise price?

The RSUs reported for Jason Child have an exercise price of 0.0000. Each vested RSU entitles him to receive one Arm Holdings Ordinary Share in ADS form, making them a typical stock-based compensation award rather than an option requiring cash payment.