This paper assesses proposals to redefine the scope of activities of systemically important financial institutions. Alongside reform of prudential regulation and oversight, these have been offered as solutions to the too-important-to-fail problem. It is argued that while the more radical of these proposals such as narrow utility banking do not adequately address key policy objectives, two concrete policy measures - the Volcker Rule in the United States and retail ring-fencing in the United Kingdom - are more promising while still entailing significant implementation challenges. A risk factor c