Drawing on recent discussions of the material cultures of markets and of financial innovation as bricolage, this paper explores the development of Island, a new share trading venue set up in 1995. The paper examines Island’s roots in a very specific conflict in the US financial markets and in the information libertarianism of ‘hacker culture’, and examines the material bricolage involved in Island’s construction. It also outlines the processes that led to a dramatic ‘Latourian’ change of scale: Island was originally a ‘micro’ development on the fringes of US markets, but within little more than a decade key features of Island became close to compulsory, as the nature of North American and Western European share trading changed utterly. (~Free access~)