Hello domaindirk,
NYSE is a federal trademark. I don't think you have a chance with this one. I own
NewYorkStockMarket.info (.net and .us also)
and don't think I can even use mine.
I fear you are in hot water with your domain. But then again, I am a newbie in the domain-game. So I may also be wrong.
Good luck though!
CoolDot