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POPSBlackberry maker becomes Canada's most valuable company " Earlier in 2005, Manulife Financial held the top spot in Canada's big companies list. It is now in third place, with a market capitalization of 62.28 billion Canadian dollars (62.3 billion U.S. dollars Nortel Networks was the country's most valuable company during the tech boom of 1999-2000. Its market capitalization reached 400 billion Canadian dollars (400 billion U.S. dollars) in 2000, making up 36 percent of the entire worth of Toronto's benchmark index at the time. It is now worth less than 7 billion Canadian dollars (7 billion U.S. dollars). "