Transaction in Thomson Reuters shares 
 
 
NEW YORK, NY, May 15, 2008 - Thomson Reuters (NYSE: TRI; TSX: TRI; LSE: TRIL: NASDAQ: TRIN), the world's leading source of intelligent information for businesses and professionals in the financial, legal, tax and accounting, scientific, healthcare, and media markets, today announced the re-purchase of 350,000 Thomson Reuters PLC ordinary shares on May 15, 2008. The average price paid was 1613.48 pence per share. The highest price per share paid was 1641 pence and the lowest price per share paid was 1589 pence. 
 
As of May 15, 2008, Thomson Reuters PLC had 189,703,372 ordinary shares outstanding. The re-purchased shares of Thomson Reuters PLC will be cancelled.

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