Holding(s) in Company

For filings with the FSA include the annex                                     
                                                                               
For filings with issuer exclude the annex                                      

TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARESi                                

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

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  Allianz Global Investors                           
(s) subject to the      GmbH                                               
notification                                                               
obligation: iii                                                            
                                                                           
4. Full name of                                                            
shareholder(s) (if                                                         
different from 3.):iv                                                      
                                                                           
5. Date of the                                    19/05/2015               
transaction and date on                                                    
which the threshold is                                                     
crossed or reached: v                                                      
                                                                           
6. Date on which issuer                           21/05/2015               
notified:                                                                  
                                                                           
7. Threshold(s) that is                           5%                       
/are crossed or                                                            
reached: vi, vii                                                           
                                                                           

8. Notified details:
A: Voting rights attached to shares viii, ix

Class/type of Situation previous            Resulting situation after           
shares         to the triggering                  the triggering                
                  transaction                      transaction                  
                                                                                
if possible              Number                   Number          % of voting   
using          Number      of      Number           of             rights x     
the ISIN CODE    of      Voting      of           voting                        
               Shares    Rights    shares         rights                        
                                                                                
                                   Direct   Direct xi Indirect  Direct  Indirect
                                                        xii                     
                                                                                
GB0006650450  2,909,741 2,909,741 2,721,503 2,721,503          4.75%            

B: Qualifying Financial Instruments                                            
                                                                               
Resulting situation after the triggering transaction                           

Type of financial Expiration     Exercise/      Number of voting   % of voting 
   instrument     date xiii  Conversion Period rights that may be    rights    
                                    xiv         acquired if the                
                                                 instrument is                 
                                                   exercised/                  
                                                   converted.                  
                                                                               

C: Financial Instruments with similar economic effect to Qualifying Financial  
Instruments xv, xvi                                                            
                                                                               
Resulting situation after the triggering transaction                           

   Type of     Exercise Expiration Exercise/  Number of voting    % of voting   
  financial     price   date xvii  Conversion rights instrument  rights xix, xx 
  instrument                         period       refers to                     
                                     xviii                                      
                                                                                
                                                                Nominal   Delta 
                                                                                

Total (A+B+C)                                                                  
                                                                               
        Number of voting rights               Percentage of voting rights      
                                                                               
               2,721,503                                 4.75%                 

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

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:                     Oxford Instruments plc         
                                                                               
14. Contact name:                                 Susan Johnson-Brett          
                                                                               
15. Contact telephone number:                        01865 393 200