These are spams for small companies that are traded on markets. The only problem is that the Markets that you've heard of... "Dow Jones, Nasdaq, AMEX, etc" won't touch them because they are (if you'll forgive me) small change.
Pretty much any stock trading under $1.50 per share is just too damned volatile to consider.
One of my Penny Stock Spams was for a company that specializes in new technology.
...a leader in the fight against email based viruses, spam, and outbound threats of corporate espionage....
Trading at $0.11 per share on August 2 they haven't actually traded any shares since.