pump and dump
v. When a stockbroker, analyst, or shareholder encourages investors to buy a particular stock in an effort to raise its share price, and then to sell what he owns of the stock at the higher price.

Example Citation:
"Some of the promoters charged Wednesday allegedly engaged in 'pump-and-dump' schemes in which they spread falsely positive information about stocks. As small investors piled into the stocks, sending the prices up, the promoters sold the shares they owned."
—Walter Hamilton, "SEC Cracks Down on Internet Stock Fraud," Los Angeles Times

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