Tower Research Capital, one of the biggest names in quantitative trading, has quietly become a player in one of Wall Street's hottest talent races — backing external traders. In the battle to attract top investment talent, hedge funds such as Millennium, Qube, and Schonfeld have increasingly pitched a tantalizing setup to prized candidates: Rather than joining another in-house investing or trading team, they can set up a separate vehicle to run the firm's capital under their own banner. These