Director/PDMR Shareholding

Oxford Instruments plc                             

          Notification of transactions by PDMR and Connected Persons           

On 30 July 2012 certain purchases and awards of ordinary shares of 5 pence each
in the capital of Oxford Instruments plc (the "Company") were made under the
all-employee Oxford Instruments Share Incentive Plan (the "SIP") including by
and to the following Executive Directors (PDMR) and Connected Person as
follows:

    Executive Director       No. of shares   No. of shares 
                             acquired as      awarded as   
  (or Connected Person as     Partnership   Matching Shares
         relevant)              Shares                     
                                                           
        Kevin Boyd                10               2       
                                                           
      Jonathan Flint              10               2       
                                                           
      Charles Holroyd             10               2       
                                                           
      (Claire Flint)               2               0       

Claire Flint is a Connected Person to Jonathan Flint by way of marriage.

The Partnership Shares and Matching Shares were acquired at a cost of £12.5484
each. The Matching Shares are subject to a risk of forfeiture which will
normally be removed on the third anniversary of award subject to the
participant's continued employment and the retention of the linked Partnership
Shares. No consideration was paid by the participants for the award of the
Matching Shares and no consideration is due on the release of the Matching
Shares or in relation to Partnership Shares and Dividend Shares.

The above transactions were undertaken on behalf of the above individuals by
the trustee of the SIP and the shares were purchased on the London Stock
Exchange.

The above notifications are made in accordance with Rule 3.1.4 of the UKLA
Disclosure Rules and Transparency Rules.

Oxford Instruments plc was notified of the above transactions on 31 July 2012.

Name of contact and telephone number for queries: Susan Johnson-Brett, 01865
393324.

For and on behalf of Oxford Instruments plc

Date: 31 July 2012