Two primary drivers have transformed the equity markets in recent years: technological advances and regulatory initiatives. How does modern, electronic technology facilitate trading, and to what extent does it present new challenges? How does regulation adjust to the changing structure of the markets, and to what extent is it itself a source of change? What are the new problems and solutions for handling institutional orders? On both sides of the Atlantic, what are the overall impacts of technology and regulation on market quality? The conference resulting in this volume brought together buyside and sellside practitioners, regulators, and academicians to address these and related issues.