When Council Regulation (EC) No 2157/2001 on the Statute for a European Company (Societas Europaea, SE) became effective on 8 October 2004, it offered existing publicly traded companies, for the first time, a choice between competing company laws, namely the national law of the company's home state and the law of the supranational SE. Using an event study methodology, this chapter analyses a unique dataset of publicly traded firms that have announced to re-incorporate under the SE Regulation. The findings offer insights into how the market accepts the new European legal form.