Legg Mason Inc., the Baltimore-based asset manager, reported last week that assets under management in September were $707.8 billion, up 7.9 percent from $656.0 billion in September 2013. Fixed income investments closed at $360.4 billion, an increase from last year’s $355 billion. Managed assets in stocks this September totaled $193.6 billion versus $169.5 billion in the same month last year. Liquid assets, such as money-market mutual funds, rose to $153.8 billion, up from the $131.5 billion reported in August 2013. Month over month, AUM was down from $711.2 billion in August.