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Indicators a stock is part of a pump and dump scheme?
Pump-and-dump scams are indeed very real, but the scale of a single scam isn't anywhere near the type of heist you see in movies like Trading Places. Usually, the scammer will buy a few hundred dollars of a penny stock for some obscure small business, then they'll spam every address they have with advice that this business is about to announce a huge breakthrough that will make it the next Microsoft. A few dozen people bite, buy up a few thousand shares each (remember the shares are trading for pennies), then when the rise in demand pushes up the price enough for the scammer to make a decent buck, he cashes out, the price falls based on the resulting glut of stock, and the victims lose their money. Thus a few red flags shake out that would-be investors should be wary of: