(Bloomberg) -- Tesla Inc.’s stock surge is taking a toll on another hedge fund manager as Tom Claugus’s GMT Capital suffered losses last month after betting against the electric-car maker. GMT’s three Bay Resource long-short equity funds, which have roughly $3.3 billion in combined assets, each plunged about 10% in January, Claugus confirmed. Tesla’s heavily shorted stock soared 55% in the month, helped by the company’s second straight quarter of blowout earnings. “Tesla has done a really good job getting to sustainability,” Claugus said in a telephone interview.