 Charles Schwab Investment Management Inc. trimmed its position in shares of Affiliated Managers Group, Inc. NYSE:AMG by 16.6 in the 4th quarter, HoldingsChannel.com reports. The institutional investor owned 419,539 shares of the asset managers stock after selling 83,658 shares during the period. Charles Schwab Investment Management Inc.s holdings in Affiliated Managers Group were worth 35,552,000 ... 