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RIM investor Watsa doubles stake
Prem Watsa, one of Canada's best-known value investors, has nearly doubled his stake in BlackBerry makerThe increase makes him the largest shareholder in the struggling company and identifies a buyer for shares that other investors have been unloading.RIM shares rose 1 cent to $6.78 in midday trading Monday. The shares have lost 95 percent of their value since 2008 as BlackBerry sales have lost out to the
