Richard Roy Grisenthwaite

CIK: 0002112445

Transaction Breakdown

Open Market Buys (P)0 (0.0%)

High conviction signal

Open Market Sales (S)1 (11.1%)

Position reduction

Option Exercises (M)4 (44.4%)

Derivative conversions

Awards (A)3 (33.3%)

Compensation grants

Other (G, F, J, C, D, …)1 (11.1%)

Gifts, tax withholding, conversions, dispositions to the issuer and other codes

Companies & Roles (1)

ARM

ARM HOLDINGS PLC /UK

Officer

Discretionary Trading P&L

Holdings

Transaction History (9 total)

ARM
ARM HOLDINGS PLC /UK
May 18, 2026
Sale(S)
Direct
24.3K shares at avg. $209.15$5.1M
ARM
ARM HOLDINGS PLC /UK
May 15, 2026
Exercise(M)
Direct
2K shares-
ARM
ARM HOLDINGS PLC /UK
May 15, 2026
Exercise(M)
Direct
14.6K shares-
ARM
ARM HOLDINGS PLC /UK
May 15, 2026
Award(A)
Direct
4.2K shares-
ARM
ARM HOLDINGS PLC /UK
May 15, 2026
Award(A)
Direct
5.2K shares-
ARM
ARM HOLDINGS PLC /UK
May 15, 2026
Award(A)
Direct
13.3K shares-
ARM
ARM HOLDINGS PLC /UK
May 15, 2026
Exercise(M)
Direct
4.4K shares-
ARM
ARM HOLDINGS PLC /UK
May 15, 2026
Tax Payment(F)
Direct
21.3K shares at avg. $209.16$4.5M
ARM
ARM HOLDINGS PLC /UK
May 15, 2026
Exercise(M)
Direct
1.6K shares-

		Type	Shares	Price		Ownership
May 18, 2026	ARM ARM HOLDINGS PLC /UK	Sale(S)	24,339	$209.15	$5,090,502	Direct
May 15, 2026	ARM ARM HOLDINGS PLC /UK	Exercise(M)	2,046	-	$0	Direct
May 15, 2026	ARM ARM HOLDINGS PLC /UK	Exercise(M)	14,595	-	$0	Direct
May 15, 2026	ARM ARM HOLDINGS PLC /UK	Award(A)	4,158	-	$0	Direct
May 15, 2026	ARM ARM HOLDINGS PLC /UK	Award(A)	5,217	-	$0	Direct
May 15, 2026	ARM ARM HOLDINGS PLC /UK	Award(A)	13,315	-	$0	Direct
May 15, 2026	ARM ARM HOLDINGS PLC /UK	Exercise(M)	4,352	-	$0	Direct
May 15, 2026	ARM ARM HOLDINGS PLC /UK	Tax Payment(F)	21,301	$209.16	$4,455,317	Direct
May 15, 2026	ARM ARM HOLDINGS PLC /UK	Exercise(M)	1,631	-	$0	Direct

1-9 of 9 transactions

About Grisenthwaite Richard Roy

Grisenthwaite Richard Roy (SEC CIK 0002112445) files insider reports with the SEC as Chief Architect of ARM HOLDINGS PLC /UK (ARM).

Signal8 holds 2 ownership filings by Grisenthwaite Richard Roy (1 Form 3, 1 Form 4), filed between Mar 18, 2026 and May 19, 2026. Those filings report 9 transactions, from May 15, 2026 to May 18, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on Grisenthwaite Richard Roy's filings is in CAMBRIDGE.

Recent filings by Grisenthwaite Richard Roy

May 18, 2026: Open-market sale of ARM shares (Form 4, code S).
May 15, 2026: Option exercises of ARM shares (2 lines, Form 4, code M).
May 15, 2026: Grants or awards of ARM shares (3 lines, Form 4, code A).
May 15, 2026: Option exercise of ARM shares (Form 4, code M).
May 15, 2026: Tax withholding of ARM shares (Form 4, code F).

Other insiders filing for ARM HOLDINGS PLC /UK (ARM)

Child Jason, Chief Financial Officer
Abbey William, Chief Commercial Officer
Haas Rene A., Chief Executive Officer
Bartels Laura Kathleen, Chief Accounting Officer
Sine Jeffrey, Director
Eaton Charlotte Claire, Chief People Officer

How to read Form 4 transaction codes