Yes of course:

https://btct.co/

https://bitfunder.com/

http://mpex.co/

https://www.havelockinvestments.com/

It's all risky and low volume, as you might expect. Then there's also OTC with people doing auctions on forums, etc.

> * This is a virtual stock exchange using virtual currency. Virtual goods utilized on this site are for entertainment and educational purposes only.

So the favorable interpretation would be that this is a toy exchange... The other possibility being a conveyor of unregistered securities.

> The other possibility being a conveyor of unregistered securities.

ding ding ding

BTCTC also announced they were considering blocking all U.S. users to avoid confronting the SEC, even though I believe they run in another country.

A few days after they posted they were considering it, they said they decided not to and will be continuing operations to US citizens with an added disclaimer.

It looks like Bitcoin has risen in value about 30% during that time period compared to stable currencies, so the share drop is not really that dramatic.