http://www.berlinerboerse.de/?SID=&LANG=en
Looks like PTSC is one of the hottest stocks in Berlin.
In what looks like volume in Eurodollars PTSC ranks #3 ahead of lightweights like GM* and Daimler-Chrysler. And it is the #1 most requested orderbook stock.
*over exuberance note - I checked on Yahoo GM.BE had traded only 1000 shares (aprrox. 25000 Euros)