Hedge fund manager Larry Robbins announced he is closing his funds after losing bets on the health-care industry, while giving existing investors the opportunity to invest in a long-only fund. Robbins’ Glenview Opportunity Fund has been the top-performing hedge fund over the last three years, with annualized returns of more than 57 percent. He’s done this by relying on concentrated exposure to health care shares, which he believed would soar on the back of Obamacare and an aging baby boomer population.