There was something like this a while back that was shut down: https://btct.co/
Maybe this is not based in the US though, judging from the British flag on the language selection.
Well, you can always use a decentralized stock market, like Nxt has;
You can see some asset charts on http://www.cryptoassetcharts.info
Can't be shut down.
Re:Cryptostocks
by waterlesscloud on Tuesday May 27, 2014 @12:28AM
(#7802861)
No.
Is running an unregulated "stock market" legal in the U.S. (or whatever country this site is based in)? Is buying and selling shares on such a market legal in the U.S.?