Seth Klarman's Baupost Group bet big on Restaurant Brands International shares in the third quarter as the fast-food stock slipped. The billionaire hedge fund manager more than doubled his stake in the Burger King and Popeyes parent, regulatory fillings show. Restaurant Brands was the biggest holding in the Boston-based fund at just shy of $530 million, according to InsiderScore. Shares of the quick-service restaurant stock lost more than 3% in the three-month period, bucking the broader market's uptrend with the S & P 500 gaining almost 8% in the same timeframe. Klarman is known for buying discarded and undervalued stocks similar to Benjamin Graham, which has earned comparisons to Berkshire Hathaway CEO Warren Buffett . Klarman's bet on Restaurant Brands appeared to pay off: The Tim Horto

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