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 plcissuer of existing shares to which votingrights are attached: ii 2 Reason for the notification (please tick the appropriate box or boxes): An acquisition or disposal of voting rights Yes An acquisition or disposal of qualifying financial instruments whichmay result in the acquisition of shares already issued to which votingrights are attached An acquisition or disposal of instruments with similar economic effectto qualifying financial instruments An event changing the breakdown of voting rights Other (pleasespecify): 3. Full name of person(s) subject to Kames Capitalthe notification obligation: iii 4. Full name of shareholder(s) (ifdifferent from 3.):iv 5. Date of the transaction and date 24 June 2013on which the threshold is crossed orreached: v 6. Date on which issuer notified: 24 June 2013 7. Threshold(s) that is/are crossed 4%or reached: vi, vii 8. Notified details:A: Voting rights attached to shares viii, ix Class/type Situation previous Resulting situation afterof to the triggering the triggeringshares transaction transaction if possible Number Number % of votingusing Number of Number of rights xthe ISIN of Voting of votingCODE Shares Rights shares rights Indirect Direct xi Indirect Direct Indirect xii GB0006650450 2,279,341 2,279,341 1,506,297 1,506,297 638,235 2.65% 1.12% 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. n/a C: Financial Instruments with similar economic effect to Qualifying FinancialInstruments 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 Contract for 81,404 0.14% 1Difference Total (A+B+C) Number of voting rights Percentage of voting rights 2,225,936 3.91% 9. Chain of controlled undertakings through which the voting rights and/or thefinancial instruments are effectively held, if applicable: xxi Kames Capital:- Kames Capital plcKames Capital Management LtdKames Capital ICVCKames Capital VCIC Proxy Voting: 10. Name of the proxy holder: Kames Capital 11. Number of voting rights proxyholder will cease to hold: 12. Date on which proxy holder willcease to hold voting rights: 13. Additional information: Oxford Instruments plc 14. Contact name: Susan Johnson-Brett 15. Contact telephone number: 01865 393 324