Citadel tops list of private U.S. trading venues: report

By John McCrank NEW YORK (Reuters) - Citadel Securities, one of the top market makers in U.S. stocks and listed stock options, runs one of the largest stock trading venues in the country, according to a report released on Monday aimed at providing transparency into where stock trading occurs. Citadel LLC, which also operates a hedge fund, executed just over 1.1 billion shares in its brokerage the week of April 4, according to the Financial Industry Regulatory Authority, Wall Street's own watchdo