This is a deliberate attempt to interfere with the free and fair operation of the market and create artificial, false or misleading appearances with respect to the price of a security.
Examples
1. Pools:
"Agreements, often written, among a group of traders to delegate authority to a single manager to trade in a specific stock for a specific period of time and then to share in the resulting profits or losses."
2. Churning:
"When a trader places both buy and sell orders at about the same price. The increase in activity is intended to attract additional investors, and increase the price.
3. Runs:
"When a group of traders create activity or rumors in order to drive the price of a security up."
4. Ramping:
"Actions designedto artificially raise the market price of listed securities and to give the impression of voluminous trading, in order to make a quick profit."
5. Wash trade:
"Selling and repurchasing the same or substantially the same security for the purpose of generating activity and increasing the price"
6. Bear raid:
"Attempting to push the price of a stock down by heavy selling or short selling."
courtersy of wikipedia
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