ARM.L Regulatory News (ARM)

TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARES

1. Identity of the issuer or the underlying issuer of existing shares to which voting rights are attached:

ARM Holdings plc

2 Reason for the notification (please tick the appropriate box or boxes):

An acquisition or disposal of voting rights

X

An acquisition or disposal of qualifying financial instruments which may result in the acquisition of shares already issued to which voting rights are attached

An acquisition or disposal of instruments with similar economic effect to qualifying financial instruments

An event changing the breakdown of voting rights

Other (please specify):

3. Full name of person(s) subject to the notification obligation:

The Capital Group Companies, Inc.

4. Full name of shareholder(s) (if different from 3.):

See Schedule A

5. Date of the transaction and date on which the threshold is crossed or reached:

1 February 2013

6. Date on which issuer notified:

4 February 2013

7. Threshold(s) that is/are crossed or reached:

Below 7%

8. Notified details:

A: Voting rights attached to shares

Class/type ofshares

if possible usingthe ISIN CODE

Situation previousto the triggeringtransaction

Resulting situation after the triggering transaction

NumberofShares

NumberofVotingRights

Numberof shares

Number of voting rights

% of voting rights

Direct

Indirect

Direct

Indirect

Direct

Indirect

 Ordinary

(GB0000595859)

97,116,811

97,116,811

95,690,311

 95,690,311

 6.9302%

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Expirationdate

Exercise/ConversionPeriod

Number of votingrights that may beacquired if theinstrument isexercised/ converted.

% of votingrights

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Exerciseprice

Expirationdate

Exercise/Conversionperiod

Number of votingrights instrumentrefers to

% of voting rights

Nominal

Delta

Total (A+B+C)

Number of voting rights

Percentage of voting rights

95,690,311

6.9302%

9. Chain of controlled undertakings through which the voting rights and/or thefinancial instruments are effectively held, if applicable:

See Schedule A

Proxy Voting:

10. Name of the proxy holder:

11. Number of voting rights proxy holder will cease to hold:

12. Date on which proxy holder will cease to hold voting rights:

13. Additional information:

14. Contact name:

15. Contact telephone number:

Note: Annex should only be submitted to the FSA not the issuer

Annex: Notification of major interests in share

A: Identity of the persons or legal entity subject to the notification obligation

Full name

(including legal form of legal entities)

The Capital Group Companies, Inc.

Contact address

(registered office for legal entities)

333 South Hope Street, 55th Floor

Los Angeles, California 90071

Phone number & email

(213) 615-0469

GRGroup@capgroup.com

Other useful information

(at least legal representative for legal persons)

B: Identity of the notifier, if applicable

Full name

Christopher Aquino

Contact address

333 South Hope Street, 55th Floor

Los Angeles, California 90071

Phone number & email

Tel: (213) 486-9200

Other useful information

(e.g. functional relationship with the person or legal entity subject to the notification obligation)

Fax: (213) 615-4056

C: Additional information

Due to a company reorganization, Capital Group International, Inc. ("CGII") and Capital Research and Management Company ("CRMC") will no longer report relevant holdings separately. With effect from 1 September 2012, the holdings under management will be reported in aggregate by the group's parent company, The Capital Group Companies, Inc.