For filings with the FSA include the annexFor filings with issuer exclude the annexTR-1: NOTIFICATION OF MAJOR INTEREST IN SHARESi1. Identity of the issuer or the underlying Oxford Instruments plcissuer of existing shares to which votingrights are attached: ii2. Reason for the notification (please tick the appropriate box or boxes):An acquisition or disposal of voting rights XAn acquisition or disposal of qualifying financial instruments whichmay result in the acquisition of shares already issued to which votingrights are attachedAn acquisition or disposal of instruments with similar economic effectto qualifying financial instrumentsAn event changing the breakdown of voting rightsOther (pleasespecify):3. Full name of person(s) subject to The Capital Group Companies, Inc.the notification obligation: iii4. Full name of shareholder(s) (if See Section 9different from 3.):iv5. Date of the transaction and date 13 August 2014on which the threshold is crossed orreached: v6. Date on which issuer notified: 14 August 20147. Threshold(s) that is/are crossed Below 3%or reached: vi, vii8. Notified details:A: Voting rights attached to shares viii, ixClass/type Situation previous Resulting situation afterof to the triggering the triggeringshares transaction transactionif 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 xiiGB0006650450 1,719,500 1,719,500 1,712,000 2.9895%B: Qualifying Financial InstrumentsResulting situation after the triggering transactionType 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 FinancialInstruments xv, xviResulting 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 DeltaTotal (A+B+C) Number of voting rights Percentage of voting rights 1,712,000 2.9895%9. Chain of controlled undertakings through which the voting rights and/or thefinancial instruments are effectively held, if applicable: xxiThe Capital Group Companies, Inc. ("CG") holdings - 1,712,000 - 2.9895%Holdings by CG Management Companies and Funds: * Capital Research and Management Company - 1,712,000 - 2.9895%Proxy Voting:10. Name of the proxy holder: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 plc14. Contact name: Susan Johnson-Brett15. Contact telephone number: 01865 393 324