Arm Holdings (ARM) CLO details RSU awards and share ownership

Rhea-AI Filing Summary

Arm Holdings plc Chief Legal Officer Spencer Collins discloses his current equity holdings in the company. He directly holds 51,961 Ordinary Shares and several restricted stock unit (RSU) awards that are currently tied to 108,015, 13,947 and 9,216 underlying Ordinary Shares.

One RSU award was granted on December 9, 2025 and is scheduled to vest 30% on each of November 15, 2026 and November 15, 2027, with the remaining 40% on November 15, 2028, subject to continued service. Another was granted on May 1, 2025 with similar 30/30/40 vesting on May 15, 2026, May 15, 2027 and May 15, 2028. An earlier RSU award was granted on May 13, 2024, of which 30% vested on May 15, 2025, with 30% and 40% scheduled to vest on May 15, 2026 and May 15, 2027, subject to continued service. Each RSU represents the right to receive one Ordinary Share, which is held in the form of an American Depositary Share, and each ADS represents one Ordinary Share.

Insider Trade Summary

4 transactions reported

Mixed 4 txns

Insider Collins Spencer

Role Chief Legal 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 — 51,961 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 13,165 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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hours per response:			0.5

1. Name and Address of Reporting Person^*

Collins Spencer

(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 Legal 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)	51,961	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)	13,947	(3)	D
Restricted Stock Units	(5)	(5)	Ordinary Shares(1)	9,216	(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 13,165 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 Spencer Collins	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 equity holdings does Arm (ARM) Chief Legal Officer Spencer Collins report?

Spencer Collins reports direct ownership of 51,961 Ordinary Shares plus several restricted stock unit (RSU) awards. These RSUs are currently tied to 108,015, 13,947 and 9,216 underlying Ordinary Shares, providing potential future share delivery as vesting conditions tied to continued service are met.

How are Spencer Collins’ restricted stock units in Arm (ARM) structured?

His RSUs each represent the right to receive one Arm Ordinary Share, held as an American Depositary Share. The awards vest in tranches over several years, with typical 30%, 30% and 40% schedules, conditioned on continued service with Arm Holdings plc throughout the specified vesting dates.

What are the key vesting dates for Spencer Collins’ December 2025 Arm (ARM) RSU grant?

The December 9, 2025 RSU grant is scheduled to vest 30% on November 15, 2026, another 30% on November 15, 2027, and the remaining 40% on November 15, 2028. All vesting is subject to Collins’ continued service with Arm Holdings plc through each vesting date.

What vesting schedule applies to Spencer Collins’ May 1, 2025 RSU award at Arm (ARM)?

The May 1, 2025 RSU award vests 30% on May 15, 2026, another 30% on May 15, 2027, and the final 40% on May 15, 2028. Each portion vests only if Collins continues to provide service to Arm Holdings plc through the respective vesting date.

How does the May 13, 2024 RSU grant for Arm (ARM) Chief Legal Officer vest?

The May 13, 2024 RSU grant of 13,165 units vested 30% on May 15, 2025. The remaining 30% and 40% tranches are scheduled to vest on May 15, 2026 and May 15, 2027, respectively, contingent on continued service to Arm Holdings plc through those dates.

How are Arm (ARM) Ordinary Shares and American Depositary Shares related for Spencer Collins’ holdings?

Arm Ordinary Shares have a nominal value of 0.001 GBP per share and are held as American Depositary Shares (ADSs). Each ADS represents one Ordinary Share, so Collins’ RSUs and direct Ordinary Share holdings translate one-for-one into ADSs for trading and settlement purposes.