RNS Number : 9250U

Thomson Reuters PLC

20 May 2008

Form TR-1 with annex. FSA Version 2.1 updated April 2007

For filings with the FSA include the annex

For filings with issuer exclude the annex

TR-1: Notifications of Major Interests in Shares

1. Identity of the issuer or the underlying issuer Thomson Reuters plc

of existing shares to which voting rights are

attached:

2. Reason for notification (yes/no)

An acquisition or disposal of voting rights YES

An acquisition or disposal of financial instruments which may result in

the acquisition of shares already issued to which voting rights are

attached

An event changing the breakdown of voting rights

Other (please specify):______________

3. Full name of person(s) Credit Suisse Securities (Europe) Limited

subject to notification

obligation:

4. Full name of shareholder(s) Credit Suisse Securities (Europe) Limited

(if different from 3): Credit Suisse International

Credit Suisse Securities (USA) LLC

5. Date of transaction (and 16.05.08

date on which the threshold is

crossed or reached if

different):

6. Date on which issuer 20.05.08

notified:

7. Threshold(s) that is/are 9%

crossed or reached:

8: Notified Details

A: Voting rights attached to shares

Class/type of shares Situation previous to the triggering Resulting situation after the triggering transaction

If possible use ISIN transaction

code

Number of shares Number of voting Number of shares Number of voting rights Percentage of voting

rights rights

Direct Indirect Direct Indirect

ORD

GB00B29MWZ99 18,523,899 18,523,899 16,779,110 16,779,110 n/a 8.64% n/a

ADR

US8851411012 1,866 1,866 13,686 13,686 n/a 0.007% n/a

B: Financial Instruments

Resulting situation after the triggering transaction

Type of financial instrument Expiration date Exercise/ conversion No. of voting rights Percentage of voting

period/date that may be acquired rights

(if the instrument

exercised/converted)

Total (A+B)

Number of voting rights Percentage of voting rights

16,792,796 8.65%

9. Chain of controlled undertakings through which the voting rights and /or

the financial instruments are effectively held, if applicable:

Credit Suisse Securities (Europe) Limited , Credit Suisse International and

Credit Suisse Securities (USA) LLC are a division of Credit Suisse

('CSIBD'), which is part of the Credit Suisse Group ('CSG'). CSIBD is a

segregated business unit within CSG with an independent management structure

and exercises its voting rights independently from other divsions of CSG

Proxy Voting:

10. Name of 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: Simon Crawley

15. Contact telephone number: +44 (0) 20 7888 5416

For notes on how to complete form TR-1 please see the FSA website.

This information is provided by RNS

The company news service from the London Stock Exchange

END

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