We investigate and test hypotheses on how informed trading varies with market-wide factors and the structural and trading characteristics of a firm. We find strong evidence of commonality in informed trading, and a systematic dependence of informed trading on firm characteristics that is largely...

We investigate empirically the impact of electronic market-makers on the reliability and the consistency with which financial markets provide transactional liquidity services. Our analysis is based on proprietary intraday data from U.S. futures markets. We document results of considerable...