TR-1: Notifications of Major Interests in Shares
1. Identity of the issuer or the Oxford Instruments PLC
underlying issuer of existing shares
to which voting rights are attached:
2: Reason for notification (please tick the appropriate box or boxes)
An acquisition or disposal of voting rights
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(s) subject to the Hermes Equity Ownership Services notification
Limited
obligation:iii4. Full name of shareholder(s) (if Shares are held by the relevant different from 3.):iv
custodian(s)
5. Date of the transaction (and date on 9 May 2012
which the threshold
is crossed or reached):v
6. Date on which issuer notified: 10 May 2012
7. Threshold(s) that is/are crossed or 0%
reached:
8: Notified Details
A. Voting rights attached to shares
* Class/type of share If possible GB0006650450
use ISIN code
Situation previous to the triggering transaction
* Number of shares * Number of voting rights
1,871,352 1,871,352Resulting situation after the triggering transaction
* Number of Number of voting rights Percentage of
shares voting rights
Direct Indirect Direct Indirect
17,570 0.03128%
B. Qualifying Financial Instruments
Resulting situation after the triggering transaction
Type of Expiration Exercise/ No. of voting Percentage of
financial date conversion rights that may voting rights
instrument period/date be acquired
(if the
instrument
exercised/
converted)
Delta
C: Financial Instruments with similar economic effect to Qualifying Financial Instruments
Resulting situation after the triggering transaction
Type of financial Exercise Expiration Exercise/ Number of % of voting
instrument price date Conversion voting rights
period rights
instrument
refers to
Nominal
Total (A+B+C)
Number of voting rights Percentage of voting rights
17,570 0.03128%
9. Chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held, if applicable:
BT Pension Scheme Trustees Limited, as trustee of the BT Pension Scheme ("BTPS") controls Britel Fund Trustees Limited, which is the parent undertaking of Hermes Fund Managers Limited ("HFML"). HFML is the parent undertaking of Hermes Equity Ownership Services Limited ("HEOS") (voting rights: 0.03128%)*
* This notification is being made in respect of HEOS, which is an indirect holder of shares for the purpose of DTR 5.2.1(h) as a result of control of voting rights in relation to such shares.
Proxy Voting:
10. Name of the proxy holder: See comment in Section 911. Number of voting rights proxy holder See comment in Section 9 will cease to hold:
12. Date on which proxy holder will cease to See comment in Section 9
hold voting rights:
13. Additional information: This disclosure represents a cessation of
voting control only.
14. Contact name: Susan Johnson-Brett, Company Secretary15. Contact telephone number: 01865 393324
