Holding(s) in Company

TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARESi

TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARES

1. Identity of the issuer or the underlying issuerof existing shares to which voting rights areattached: ii

Tullett Prebon PLC

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(s) subject to thenotification obligation: iii

OppenheimerFunds, Inc

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

5. Date of the transaction and date onwhich the threshold is crossed orreached: v

May 4, 2012

6. Date on which issuer notified:

May 7, 2012

7. Threshold(s) that is/are crossed orreached: vi, vii

5% (increased to 5.03%)

8. Notified details:

Nigel Szembel

Tullett Prebon PLC

155 Bishopsgate

London EC2M 3TQ

[email protected]

A: Voting rights attached to shares viii, ix

Class/type ofshares

if possible usingthe ISIN CODE

Situation previousto the triggeringtransaction

Resulting situation after the triggering transaction

NumberofShares

NumberofVotingRights

Numberof shares

Number of votingrights

% of voting rights x

Direct

Direct xi

Indirect xii

Direct

Indirect

GB00B1H0DZ51

8,623,507

8,623,507

10,951,454

10,951,454

5.03%

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Expirationdate xiii

Exercise/Conversion Period xiv

Number of votingrights that may beacquired if theinstrument isexercised/ converted.

% of votingrights

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments xv, xvi

Resulting situation after the triggering transaction

Type of financialinstrument

Exercise price

Expiration date xvii

Exercise/Conversion period xviii

Number of voting rights instrument refers to

% of voting rights xix, xx

Nominal

Delta

Total (A+B+C)

Number of voting rights

Percentage of voting rights

217,611,872

5.03%

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

OppenheimerFunds, Inc. ("OFI") is a registered investment advisor with the U.S. SEC. Its ultimate parent company, Massachusetts Mutual Life Insurance Company, qualifies for disaggregation under FSA regulations. The shares of the issuer are held by investment accounts managed by OFI and its subsidiary, OFI Institutional Asset Management, Inc. ("OFII").

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:

4. Contact name:

Debbie van der Sanden, Manager Compliance, OppenheimerFunds, Inc.

15. Contact telephone number:

001(303) 768-5801