OMAHA, Neb.--(BUSINESS WIRE)--TD Ameritrade, Inc. (“TD Ameritrade”), a broker-dealer subsidiary of TD Ameritrade Holding Corporation (NYSE: AMTD), is today releasing the Investor Movement Index® reading for June 2015. The Investor Movement Index, or the IMXsm, is a proprietary, behavior-based index created by TD Ameritrade that aggregates Main Street investor positions and activity to measure what investors are actually doing and how they are positioned in the markets. The June 2015 Investor Mo