You get as many chances as you want until they list the stock. If you buy tomorrow you get your shares from the company. If you buy after that then you will get the shares from whoever the person selling the shares to you is.
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Generex Biotechnology Corp. (GNBTQ) Stock Research Links
Disclaimer: Of course, all of this is my opinion and you should not make any investment decisions based on my opinion. I have not received any non-public information.