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Holding(s) in Company
ARM Holdings PLC
23 September 2004


                                SCHEDULE 10
 
                  NOTIFICATION OF MAJOR INTERESTS IN SHARES


1)   NAME OF COMPANY

     ARM HOLDINGS PLC

2)   NAME OF SHAREHOLDER HAVING A MAJOR INTEREST

     MORGAN STANLEY SECURITIES LIMITED

3)   Please state whether notification indicates that it is in respect of 
     holding of the Shareholder named in 2 above or in respect of a 
     non-beneficial interest or in the case of an individual holder if it is a
     holding of that person's spouse or children under the age of 18

     AS NAMED IN 2 ABOVE

4)   Name of the registered holder(s) and, if more than one holder, the 
     number of shares held by each of them.

     NOT DISCLOSED

5)   Number of shares/amount of stock acquired.

     N/A

6)   Percentage of issued Class

     N/A

7)   Number of shares/amount of stock disposed

     N/A

8)   Percentage of issued Class

     N/A

9)   Class of security

     ORDINARY SHARES

10)  Date of transaction

     16TH SEPTEMBER 2004

11)  Date company informed

     23RD SEPTEMBER 2004

12)  Total holding following this notification

     41,366,931
               
13)  Total percentage holding of issued class following this notification

     4.03%

14)  Any additional information



15)  Name of contact and telephone number for queries

     REBECCA HORSFALL
     +44 1223 400432

16)  Name and signature of authorised company official responsible for 
     making this notification

     Date of Notification      23RD SEPTEMBER 2004



                      This information is provided by RNS
            The company news service from the London Stock Exchange
"Safe Harbor" Statement under the Private Securities Litigation Reform Act of 1995: Statements in this press release regarding ARM Holdings plc's business which are not historical facts are "forward-looking statements" that involve risks and uncertainties. For a discussion of such risks and uncertainties, which could cause actual results to differ from those contained in the forward-looking statements, see "Risk Factors" in the Company's Annual Report or Form 10-K for the most recently ended fiscal year.