Who are the owner of bitfunder.com and btc trading corp? Do we know who he is? How do we knows he won't run away with our money?

Currently, you can buy their shares both on BitFunder and BTC Trading Corp.

Okay cool. But can I trust those 2 companies? Bitfunder and BTC Trading Corp? What about if they run with my money. Who are they? Do we know their real name?

This is not distributed stock exchange. Some guys control it and that some guys may be assholes.
With BTCT.CO each asset issuer receives a full list of all shareholders holdings every twelve hours.  So if the site did go down the damage would be limited.  Also you should only keep just enough coins for your orders on the site and not use it to store coins long term.