One Company, But Two Stocks?

[abidicefajoj]

Northwest BioTherapeutics Inc.
Symbol NWBO closed yesterday at $5.05 on NasdaqCM.
Symbol NWBOW closed yesterday at $2.89 on NasdaqCM.

1. How is it possible for one company to trade two stocks, on the same index, and at different prices?

2. Is this a common thing to find companies doing?

[akehuhar]

NWBOW are warrants

http://finance.yahoo.com/news/northw...142900786.html

[aexeniciey]

Gemalto NV
Symbol GTOFF closed yesterday at $117.25 on "Other OTC".
Symbol GTOMY closed yesterday at $58.53 on "Other OTC".

So what's the difference in these two?