Affiliated Managers Group's ( AMG) third-quarter cash earnings rose more than 16% on increased investment from its institutional clients.The Boston money manager persevered through market volatility in the third quarter, pulling in $4.3 billion in new money from investors. AMG was powered by strong growth from its growth equity managers, international equities and alternative investment products, said CEO Sean M. Healey. Net income rose 28.7% to $42.6 million for the quarter ended Sept. 30, compared with $33.1 million in the same period last year. Cash net income, which the company defines as net income plus amortization and deferred taxes related to intangible assets, plus affiliate depreciation, rose 20.9% to $61.3 million from $50.7 million. Cash earnings per share -- cash net income divided by the adjusted diluted average shares -- increased to $1.56 per share, compared with $1.34 a share in the year-ago period. The results exceeded expectations for cash earnings of $1.55 per share, according to analysts polled by Thomson Financial. Revenue increased to $345.6 million in the third quarter from $280.4 million a year earlier. AMG closed the third quarter with $276.8 billion in assets under management, an increase of more than $10.2 billion, or 3.84%, over the second quarter and $66.1 billion, or 31.4%, over the year-ago period. Healey said that the firm's growth equity managers Friess Associates, TimesSquare, Renaissance and Frontier enjoyed "exceptional" returns.