NEW YORK--(BUSINESS WIRE)--UnitedHealth Group (NYSE:UNH) announced today that its Board of Directors authorized payment of a cash dividend of $0.50 per share, to be paid on June 24, 2015, to all shareholders of record of UnitedHealth Group common stock as of the close of business on June 15, 2015. This dividend represents a 33 percent increase over the quarterly dividend of $0.375 per share the Company has been paying since the second quarter of 2014. Future dividend payments are subject to Boa