This excerpt taken from the SYT 20-F filed Mar 1, 2006.
Trading Markets and Price Ranges
Our shares are primarily listed on the Swiss Exchange and principally traded on the London-based virt-x, a recognized investment exchange supervised by the Financial Services Authority (FSA) in the United Kingdom, where all the Swiss blue chips have been principally traded since June 25, 2001. Our shares are also listed and traded on the New York Stock Exchange (in the form of ADRs).
Syngenta de-listed its shares from the London Stock Exchange and from the OM Stockholm Stock Exchange as of December 30, 2003. There has been no trading on these exchanges as of January 1, 2004.
The information presented in the tables below represent, for the periods indicated, the reported high and low closing sales prices quoted in their respective currency.