I do not know German law but I have to believe you have no cause for action until the stock drops and drops substantially. For the moment, it looks like a stock that did not receive adequate attention from the market until Mr. Prior started talking about it. If it never drops back (below $40 perhaps, who knows?) you have no choice but to acknowledge Mr. Prior might possibly know something you do not. Truth is stranger than fiction! Things like that do happen. Look at KIWT and IRSN for recent moves like SCMM has made.