I was hoping someone with a little more experience/knowledge in the stock market than me could answer a few questions. A company I own shares in (AltaRex) is being bought by another company (ViRexx) in an all share deal . I am wondering how long it usually takes for the bought companys shares to be exchanged into the buying companys shares and also why the bought companys shares would be trading for quite a bit less than the "value" they will be worth once they are converted into shares of the other companys...is this just for liquidy purposes and because people may think that the shares of the buying company will then fall in value?

thanks in advance!!