We analyze the location of stock trading for firms with a US cross-listing. The fraction of trading that occurs in the United States tends to be larger for companies from countries that are geographically close to the United States and feature low financial development and poor insider trading protection. For companies based in developed countries, trading volume in the United States is larger if the company is small, volatile, and technology-oriented, while this does not apply to emerging country firms. The domestic turnover rate increases in the cross-listing year and remains higher for firms based in developed markets, but not for emerging market firms. Domestic trading volume actually declines for companies from countries with poor enforcement of insider trading regulation. (JEL G15, G30.) Many companies list their shares not only on their domestic exchange, but also on foreign exchanges-a fact for which several reasons have been offered and explored (see Saudagaran (1988); Karolyi (1998Karolyi ( , 2006Baker, Nofsinger, and Weaver (2002);Pagano, Röell, and Zechner (2002);Doidge, Karolyi, and Stulz (2004);and Sarkissian and Schill (2004), among others). One motive often hypothesized for this decision is that cross-listing facilitates trading by foreign investors. If so, then one would expect cross-listings to be followed by fairly substantial and persistent trading activity in the foreign market.