WINNIPEG, MANITOBA--(Marketwire - Aug. 3, 2010) - Investors Group today reported preliminary mutual fund sales and assets under management for the month ending July 31, 2010. Mutual fund assets under management were $57.3-billion at July 31, 2010 compared with $54.2-billion at July 31, 2009 and $57.7-billion at December 31, 2009.