NOTIFICATION OF MAJOR INTERESTS IN SHARES

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

     Johnson Matthey plc

2.   Reason for the notification:

     An acquisition or disposal of voting rights

     An acquisition or disposal of instruments with similar economic effect to
     qualifying instruments

3.   Full name of person(s) subject to the notification obligation:

     BlackRock, Inc.

4.   Full name of shareholder(s) (if different from 3.):

     N/A

5.   Date of the transaction (and date on which the threshold is crossed or
     reached if different):

     6 March 2013

6.   Date on which issuer notified:

     7 March 2013

7.   Threshold(s) that is/are crossed or reached:

     Holding has gone above 10%

8.   Notified details:

A.   VOTING RIGHTS ATTACHED TO SHARES:

     Class/type of shares (if possible using the ISIN CODE):

     GB00B70FPS60

     Situation previous to the triggering transaction:

     Number of shares: 20,164,605
     Number of voting rights: 20,164,605

     Resulting situation after the triggering transaction:

     Number of shares (direct): N/A
     Number of voting rights (direct): N/A
     Number of voting rights (indirect): 20,254,207
     % of voting rights (direct): N/A
     % of voting rights (indirect): 9.88%

B    QUALIFYING FINANCIAL INSTRUMENTS

     N/A

C    FINANCIAL INSTRUMENTS WITH SIMILAR ECONOMIC EFFECT TO QUALIFYING FNIANCIAL
     INSTRUMENTS

     Type of financial instrument: CFD
     Exercise price: N/A
     Expiration date: N/A
     Exercise/Conversion period: N/A
     Number of voting rights instrument refers to: 289,753
     % of voting rights (Nominal): 0.14%
     % of voting rights (Delta): 0.14%
     Total voting rights: 20,543,960 shares (10.03%)

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

     BlackRock Investment Management (UK) Limited - 20,543,960 shares (10.03%)

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

14.  Contact Name:

15.  Angela Purtill, Deputy Company Secretary, Johnson Matthey plc
     Contact Telephone Number: 020 7269 8461

7 Mach 2013