Over the first two months of this year, his $9.2 billion Glenview Capital Management’s flagship portfolio lost 15 percent. The new fund — called GCM Equity Partners — is down 5.2 percent. Even worse, the Glenview Capital Opportunity fund, a $1.7 billion portfolio that uses leverage or borrowed money to enhance its bets, has lost 22.4 percent through the end of February. Mr. Robbins is not the only one. William A. Ackman, another big-name investor, is also nursing double-digit losses this year. If last year was a tough one for the swing-for-the-fences hedge fund managers who became synonymous with moneymaking...