FAIRPORT, N.Y. , Sept. 11, 2020 /PRNewswire/ -- Manning & Napier, Inc. (NYSE: MN), (" Manning & Napier " or "the Company") today reported preliminary assets under management ("AUM") as of August 31, 2020 of $19.8 billion compared with $19.1 billion at July 31, 2020 , and $18.6 billion at June