Publication ofARM Holdings plc's Annual Report2010

ARM HOLDINGS PLC

4 March 2011

For immediate release

Publication of ARM Holdings plc's Annual Report 2010

ARM Holdings plc announces that on 4 March 2011 it published its Annual Report for the year ended 31 December 2010 on the company's website at www.arm.com/ir. The Annual Report has also been sent to the UK Listing Authority.

A hard copy of the Annual Report 2010 is being sent to those shareholders who have elected to continue to receive paper communications. A hard copy of the Circular incorporating Notice of the Annual General Meeting to be held on 12 May 2011 is also being sent to all shareholders at their addresses on the register.

The unaudited Preliminary Results for the year ended 31 December 2010 were announced on 1 February 2011.

In accordance with the requirements of Rule 4.1 of the Disclosure and Transparency Rules of the UK Financial Services Authority, Appendix 1 to this announcement contains a description of the principal risks and uncertainties affecting the Group and Appendix 2 contains a directors' responsibility statement.

ARM Holdings plc also announces that it has filed with the Securities and Exchange Commission an Annual Report on Form 20-F including audited financial statements for the year ended 31 December 2010.

All of these documents are available online at ARM's website at www.arm.com/ir and the Annual Report on Form 20-F is also available at www.sec.gov.

Shareholders are able to request a hard copy of the 2010 Annual Report free of charge, subject to availability, as follows:

UK - by calling +44(0) 1628 427850 or writing to ARM Holdings plc, Liberty House, Moorbridge Road, Maidenhead, Berkshire SL6 8LT UK.

US - by calling 1-800-555-2470 or writing to Proxy Services Corporation at 200A Executive Drive, Edgewood, NY 11717 USA.

Patricia Alsop

Company Secretary

4 March 2011

Appendix 1

Principal risks and uncertainties

1. About half of ARM's revenue comes from direct sales to semiconductor companies. If there are fewer semiconductor companies, then ARM may have fewer customers to sell to. ARM is exposed to a range of markets including wireless handsets and microcontrollers. Consolidation in these parts of the industry could represent a loss to ARM's future licensing business.

2. ARM is developing more functionally capable products and our technology is becoming more widely deployed in a broad range of end markets. Having a more capable product increases the risk of patent infringement, and our success may encourage a patent owner to make a claim against ARM or one of our customers.

3. The main processor in a laptop is typically based on the x86 architecture. It has been announced that smaller and lower-power x86-based chips are being developed that will be suitable for the main processor in a smartphone. There is therefore competition from large companies that have demonstrated advanced technology and well-funded marketing strategies. They are capable of reducing ARM's market share in smartphone application processors and hindering any market share gains that might be made by ARM licensees in mobile computing.

4. It could be difficult for ARM to be successful in the microcontroller market. ARM will need to displace many established in-house processor designs. ARM has invested a lot of effort and cost to achieve modest penetration to date. As the microcontroller chips are low-cost, the royalty revenue per device is also lower than other markets.

5. Currently, most major chip companies develop their physical IP using their in-house teams. Even for companies that have outsourced manufacturing, the rate at which they want to license in physical IP is unclear. The foundries may choose to develop the physical IP. This could add more value to their customers and help create 'lock-in' by making it harder for the customer to change foundry. There are also other physical IP suppliers who compete in this market, some with a similar scale and scope to ARM.

A more detailed description of the risks facing the company is included in the Annual Report on Form 20-F.

Appendix 2

Directors' Responsibility Statement

Each of the directors whose names and functions are listed below, confirm that, to the best of each person's knowledge and belief:

1. The financial statements for the Group, prepared in accordance with IFRS as adopted by the European Union (UK GAAP for the Company) give a true and fair view of the assets, liabilities, financial position and profit of the Group and the Company; and

2. The directors' report and the financial review in the Annual Report include a fair review of the development and performance of the business and the position of the Company and the Group, together with a description of the principal risks and uncertainties that they face.

Name Function

Doug Dunn Chairman

Warren East Chief Executive Officer

Tim Score Chief Financial Officer

Tudor Brown President

Mike Inglis EVP & General Manager Processor Division

Mike Muller Chief Technology Officer

Simon Segars EVP & General Manager Physical IP Division

Andy Green Independent non-executive director

Larry Hirst Independent non-executive director

Kathleen O'Donovan Senior Independent director

Janice Roberts Independent non-executive director

Philip Rowley Independent non-executive director

John Scarisbrick Non-executive director

Young Sohn Independent non-executive director