UnitedHealth hiked its 2015 forecast after soaring past Wall Street's first-quarter expectations with a performance fueled in part by growth outside health insurance. Shares of the nation's largest health insurer climbed toward another all-time high hours before markets opened Thursday after it said it now expects annual earnings of $6.15 to $6.30 per share, up from a forecast of $6 to $6.25 per share that it made late last year.