RNS Number : 5586E

Thomson Reuters PLC

29 September 2008

TR-1: notification of major interests in shares

1. Identity of the issuer or the THOMSON REUTERS PLC

underlying issuer of existing shares to

which voting rights are attached:

2. Reason for the notification (please tick the appropriate

box or boxes)

An acquisition or disposal of voting rights

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): New Exemption DTR 5.1.3 (4) & DTR 5.1.5

(1)

3. Full name of person(s) subject to the ValueAct Capital Management, LLC

notification obligation: ValueAct Capital Management, L.P.

ValueAct Holdings GP, LLC

ValueAct Holdings L.P.

4. Full name of shareholder(s) (if (i) ValueAct Capital Master Fund,

different from 3.): L.P.

(ii) ValueAct Capital Master Fund

III, L.P.

5. Date of the transaction (and date on 25 September 2008

which the threshold is crossed or reached

if different):

6. Date on which issuer notified: 26 September 2008

7. Threshold(s) that is/are crossed or 5%

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 using transaction

the ISIN CODE

Number of Shares Number of Voting Number of shares Number of voting % of voting

Rights viii rights ix rights

Direct x Indirect xi Direct Indirect

(i) Ordinary shares 7,454,806 7,454,806 9,254,806 9,254,806 5.1%

B: Financial Instruments

Resulting situation after the triggering transaction xii

Type of financial instrument Expiration date xiii Exercise/ Conversion Number of voting % of voting rights

Period/ Date xiv rights that may be

acquired if the

instrument is

exercised/

converted.

Total (A+B)

Number of voting rights % of voting rights

9,254,806 5.1%

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

the financial instruments are effectively held, if applicable xv:

The ordinary shares are held by ValueAct Capital Master Fund, L.P. (7,761,669

ordinary shares, 4.3%) and ValueAct Capital Master Fund III, L.P. (1,493,137

ordinary shares, 0.8%). VA Partners I, LLC is the general partner of ValueAct

Capital Master Fund, L.P. VA Partners III, LLC is the general partner of

ValueAct Capital Master Fund III, L.P. ValueAct Capital Management, L.P. is

the manager of ValueAct Capital Master Fund, L.P. and ValueAct Capital Master

Fund III, L.P. ValueAct Capital Management, LLC is the general partner of

ValueAct Capital Management, L.P. ValueAct Holdings, L.P. is the sole owner

of the limited partnership interests of ValueAct Capital Management, L.P. and

the membership interests of ValueAct Capital Management, LLC, and is the

majority owner of the membership interests of VA Partners I, LLC and VA

Partners III, LLC. ValueAct Holdings GP, LLC is the General Partner of

ValueAct Holdings, L.P.

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:

This information is provided by RNS

The company news service from the London Stock Exchange

END

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