Cheng Xin / Getty Images Close Key Takeaways Robinhood's latest venture raises the prediction-markets stakes. The U.S. brokerage made popular by offering slices of stocks to retail investors is launching a futures and derivatives exchange in a bid to expand its prediction markets business. Robinhood (HOOD) announced Tuesday that the exchange will be managed by a joint venture with market maker Susquehanna International Group. Its shares were up 10% as of Wednesday afternoon, solidifying Robinhood's position ...