Pump-and-dump stock manipulation works like this: Spammers purchase stock in companies trading at very low levels, at a cheap price. They then sell off their stock at a profit, often causing the stock price to slump for those who made the mistake of investing. Global recession, jail sentences, and tighter regulation by the SEC seemed to largely kill off stock spam a few years ago. Naked Security reader Ivan forwarded us an unsolicited email claiming to come from a user of LinkedIn.”]
Source: https://grahamcluley.com/linkedin-spam-pump-dump-stock/