I am very well aware of the pump and dump schemes (sent by newsletters, spam emails etc.) by players on stocks trading in OTCBB space. However, I just thought about this: 1) How many total penny stocks are there in US? 2) Is there any official website for them? I tried google and got some links but am finding it tricky to identify if an official website exists. 3) Is there any reliable source of historical price & volume data for OTC BB stocks? either paid or free on the internet.