A scheme where people artificially hype up a stock or cryptocurrency to drive its price higher, and then quickly sell their own holdings at the inflated price. Once the insiders sell and exit, the price typically crashes, leaving other buyers with losses. This practice is illegal in most cases.
A group of traders bought 100,000 shares of a little-known penny stock for $1 per share. They then promoted it heavily online, claiming it was the next big thing. When the price rose to $5, they sold all their shares. The stock then fell back to $0.50, and new buyers who joined late lost money.
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