FAIRPORT, N.Y. , June 12, 2018 /PRNewswire/ -- Manning & Napier, Inc. (NYSE: MN), (" Manning & Napier " or "the Company") today reported preliminary assets under management ("AUM") as of May 31, 2018 of $23.0 billion compared with $22.9 billion at April 30, 2018 and $23.4 billion at March 31, 2018