Microcap Fraud:

Be skeptical of heavy stock promotions, especially if its unsolicited, says the SEC.  

Microcap fraud is when a microcap stock is heavily promoted to carry out other schemes, like pump-and-dump schemes where fraudsters try to promote or “pump” the price of stock and then sell their own holdings of stock into the market. This then causes the price to fall and investors to lose money.

To avoid this fraud, the SEC says to also look out for penny stocks connected to dormant shell companies, companies that have changed their name or business multiple times, and an unexplained increase in a stock price.

Microcap fraud, Pump and Dump scheme