Arm (NASDAQ: ARM) CAO logs RSU vesting and tax share withholding

Q: What insider transaction did ARM (ARM) disclose for Laura Kathleen Bartels?

ARM disclosed that Chief Accounting Officer Laura Kathleen Bartels had 1,681 RSUs vest and convert into Ordinary Shares on 2026-08-17 . These Ordinary Shares are held in the form of American Depositary Shares (ADSs) , each representing one Ordinary Share.

Q: How many ARM (ARM) Restricted Stock Units vested in this Form 4 filing?

A total of 1,681 Restricted Stock Units vested for Laura Kathleen Bartels. These consisted of 862 RSUs from a May 13, 2024 grant and 819 RSUs from a May 1, 2025 grant, each RSU settling into one Ordinary Share.

Q: How many ARM (ARM) shares were withheld for taxes in this transaction?

ARM reported that 856 Ordinary Shares were withheld to satisfy tax withholding requirements on the RSU vesting. The tax withholding transaction used a price of $271.43 per share , according to the Form 4 disclosure and its tax-related footnote.

Q: What do the RSU grant footnotes in ARM (ARM)’s Form 4 say about vesting?

One RSU grant dated May 13, 2024 vests 28.5% on May 15, 2025 with 6.5% quarterly thereafter, while another granted May 1, 2025 vests 28.5% on May 15, 2026 with 6.5% quarterly, each subject to continued service.

Q: How are ARM (ARM) Ordinary Shares held for this insider according to the Form 4?

The Form 4 states that ARM Ordinary Shares , nominal value 0.001 GBP per share , are held in the form of American Depositary Shares (ADSs) . Each ADS represents one Ordinary Share for reporting and settlement purposes.

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

ARM HOLDINGS PLC /UK (ARM) reported insider equity compensation activity by Chief Accounting Officer Laura Kathleen Bartels. On 2026-08-17, 1,681 Restricted Stock Units vested and were converted into the same number of Ordinary Shares (held as ADSs). In connection with this vesting, 856 Ordinary Shares were withheld at $271.43 per share to satisfy tax withholding obligations. The filing does not report updated post-transaction share holdings.

Insider Trade Summary

Net Buyer: 825 shares

Net Buy 5 txns

Insider Bartels Laura Kathleen

Role Chief Accounting Officer

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units ^{F3, F2}	862	$0.00	$0.00
Exercise	Restricted Stock Units ^{F3, F4}	819	$0.00	$0.00
Exercise	Ordinary Shares ^{F1, F2, F3}	862	--	--
Exercise	Ordinary Shares ^{F1, F4, F3}	819	--	--
Tax Withholding	Ordinary Shares ^{F1, F5}	856	$271.43	$232K

Holdings After Transaction: Restricted Stock Units — 99,571 shares (Direct); Ordinary Shares — 12,960 shares (Direct)

Footnotes (5)

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.
F2. This restricted stock unit ("RSU") award was granted on May 13, 2024, 28.5% of which vested on May 15, 2025, with quarterly vesting of 6.5% thereafter, subject to continued service to the Company.
F3. Each RSU represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.
F4. This RSU award was granted on May 1, 2025, 28.5% of which vested on May 15, 2026, with quarterly vesting of 6.5% thereafter, subject to continued service to the Company.
F5. Ordinary Shares withheld to satisfy tax withholding requirements on vesting of RSUs.

Key Figures

RSUs converted: 1,681 shares RSUs from 2024 grant: 862 shares RSUs from 2025 grant: 819 shares +5 more

8 metrics

RSUs converted 1,681 shares Total Restricted Stock Units converted into Ordinary Shares on 2026-08-17

RSUs from 2024 grant 862 shares RSUs from May 13, 2024 award that vested on 2026-08-17

RSUs from 2025 grant 819 shares RSUs from May 1, 2025 award that vested on 2026-08-17

Shares withheld for taxes 856 shares Ordinary Shares withheld to satisfy tax withholding requirements

Tax withholding price $271.43 per share Price used for Ordinary Shares withheld for tax withholding

Ordinary share nominal value 0.001 GBP per share Nominal value of ARM Ordinary Shares referenced in the filing

Initial cliff vesting percentage 28.5% Portion of each RSU award vesting on initial vesting date, subject to service

Ongoing quarterly vesting 6.5% per quarter Quarterly vesting rate for the RSU awards, subject to continued service

Key Terms

Restricted Stock Units, American Depositary Shares, withheld to satisfy tax withholding requirements, nominal value 0.001 GBP per share

4 terms

Restricted Stock Units financial

"This restricted stock unit ("RSU") award was granted on May 13, 2024"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

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.

withheld to satisfy tax withholding requirements financial

"Ordinary Shares withheld to satisfy tax withholding requirements on vesting"

FAQ

What insider transaction did ARM (ARM) disclose for Laura Kathleen Bartels?

ARM disclosed that Chief Accounting Officer Laura Kathleen Bartels had 1,681 RSUs vest and convert into Ordinary Shares on 2026-08-17. These Ordinary Shares are held in the form of American Depositary Shares (ADSs), each representing one Ordinary Share.

How many ARM (ARM) Restricted Stock Units vested in this Form 4 filing?

A total of 1,681 Restricted Stock Units vested for Laura Kathleen Bartels. These consisted of 862 RSUs from a May 13, 2024 grant and 819 RSUs from a May 1, 2025 grant, each RSU settling into one Ordinary Share.

How many ARM (ARM) shares were withheld for taxes in this transaction?

ARM reported that 856 Ordinary Shares were withheld to satisfy tax withholding requirements on the RSU vesting. The tax withholding transaction used a price of $271.43 per share, according to the Form 4 disclosure and its tax-related footnote.

At what price were ARM (ARM) shares used for tax withholding in the Form 4?

The tax withholding for Laura Kathleen Bartels’ RSU vesting used $271.43 per share for 856 Ordinary Shares. These shares were withheld rather than sold in the market, specifically to satisfy tax withholding requirements related to the RSU vesting.

What do the RSU grant footnotes in ARM (ARM)’s Form 4 say about vesting?

One RSU grant dated May 13, 2024 vests 28.5% on May 15, 2025 with 6.5% quarterly thereafter, while another granted May 1, 2025 vests 28.5% on May 15, 2026 with 6.5% quarterly, each subject to continued service.

How are ARM (ARM) Ordinary Shares held for this insider according to the Form 4?

The Form 4 states that ARM Ordinary Shares, nominal value 0.001 GBP per share, are held in the form of American Depositary Shares (ADSs). Each ADS represents one Ordinary Share for reporting and settlement purposes.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/18/2026 - 05:34 PM Accepted by SEC EDGAR 08/18/2026 - 05:31 PM

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^*

Bartels Laura Kathleen

(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 Accounting Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/17/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Ordinary Shares⁽¹⁾	08/17/2026		M		862⁽²⁾	A	⁽³⁾	12,997	D
Ordinary Shares⁽¹⁾	08/17/2026		M		819⁽⁴⁾	A	⁽³⁾	13,816	D
Ordinary Shares⁽¹⁾	08/17/2026		F⁽⁵⁾		856	D	$271.43	12,960	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Restricted Stock Units	⁽³⁾	08/17/2026		M			862	⁽²⁾	⁽²⁾	Ordinary Shares	862	$0	100,390	D
Restricted Stock Units	⁽³⁾	08/17/2026		M			819	⁽⁴⁾	⁽⁴⁾	Ordinary Shares	819	$0	99,571	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 May 13, 2024, 28.5% of which vested on May 15, 2025, with quarterly vesting of 6.5% thereafter, subject to continued service to 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, 28.5% of which vested on May 15, 2026, with quarterly vesting of 6.5% thereafter, subject to continued service to the Company.

5. Ordinary Shares withheld to satisfy tax withholding requirements on vesting of RSUs.

Remarks:

	/s/ George Kanelos, as Attorney-in-Fact for Laura Kathleen Bartels	08/18/2026
	** 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 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)

Source: View Original Filing on SEC EDGAR