Richard Roy Grisenthwaite net worth and biography

Richard Grisenthwaite Biography and Net Worth

Insider of ARM

Richard is responsible for the long-term evolution of the Arm architecture and has led its development for more than 20 years, beginning with Armv6. He is currently leading development on Armv9 to ensure its specialized processing unlocks new markets and opportunities across the full spectrum of compute.

In his early days at Arm, Richard worked on Arm720T, Arm940T, and Arm1136EJF-S. Prior to Arm, Richard worked for Analog Devices on fixed-function DSP, and at Inmos/ST on the Transputer.

Richard is an Arm fellow, has a BA in Engineering from the University of Cambridge, and holds 120 patents in the field of microprocessors. He was elected as a Fellow of the Royal Academy of Engineering in 2025.

What is Richard Roy Grisenthwaite's net worth?: The estimated net worth of Richard Roy Grisenthwaite is at least $1.42 million as of May 18th, 2026. Grisenthwaite owns 5,543 shares of ARM stock worth more than $1,422,461 as of May 20th. This net worth approximation does not reflect any other investments that Grisenthwaite may own. Learn More about Richard Roy Grisenthwaite's net worth.
How do I contact Richard Roy Grisenthwaite?: The corporate mailing address for Grisenthwaite and other ARM executives is 110 Fulbourn Road, Cambridge CB1 9NJ, United Kingdom. ARM can also be reached via phone at 44-1223-400-400. Learn More on Richard Roy Grisenthwaite's contact information.
Has Richard Roy Grisenthwaite been buying or selling shares of ARM?: During the past quarter, Richard Roy Grisenthwaite has sold $5,090,501.85 in shares of ARM stock. Most recently, Richard Roy Grisenthwaite sold 24,339 shares of the business's stock in a transaction on Monday, May 18th. The shares were sold at an average price of $209.15, for a transaction totalling $5,090,501.85. Following the completion of the sale, the insider now directly owns 5,543 shares of the company's stock, valued at $1,159,318.45. Learn More on Richard Roy Grisenthwaite's trading history.
Who are ARM's active insiders?: ARM's insider roster includes Jason Child (CFO), Spencer Collins (Insider), Richard Grisenthwaite (Insider), and Rene Haas (CEO). Learn More on ARM's active insiders.
Are insiders buying or selling shares of ARM?: In the last year, insiders at the sold shares 9 times. They sold a total of 168,589 shares worth more than $31,508,607.48. The most recent insider tranaction occured on May, 18th when insider Richard Roy Grisenthwaite sold 24,339 shares worth more than $5,090,501.85. Learn More about insider trades at ARM.
Information on this page was last updated on 5/18/2026.

Richard Roy Grisenthwaite Insider Trading History at ARM

Transaction Date	Buy/Sell	Number of Shares	Average Share Price	Total Transaction	Shares Held After Transaction	Details
5/18/2026	Sell	24,339	$209.15	$5,090,501.85	5,543

Richard Roy Grisenthwaite Buying and Selling Activity at ARM

ARM Company Overview

Arm Holdings Plc engages in the licensing, marketing, research, and development of microprocessors, systems IP, graphics processing units, physical IP and associated systems IP, software, and tools. It operates through the following geographical segments: United Kingdom, United States, and Other Countries. The company was founded on November 12, 1990 and is headquartered in Cambridge, the United Kingdom.

Today's Range

Now: $256.73

$226.09

$259.44

50 Day Range

MA: $168.98

$115.12

$237.30

2 Week Range

Now: $256.73

$100.02

$259.44

Volume

17,633,820 shs

Average Volume

7,945,973 shs

Market Capitalization

$271.24 billion

P/E Ratio

305.63

Dividend Yield

N/A

Beta

3.4