Most notable was after the internet and tech bubbles burst and investment banks were investigated for providing biased research to pump up stock prices of certain technology companies.

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One theory is that it was part of a pump and dump stock operation.

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But the statement was enough to pump up HAL stock 12% in a day.

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Look at how positively Japan's stock market responded when the government moved to pump liquidity into Japanese banks.

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The issue: Did executives pump up the company's stock by touting the drug as a blockbuster, even while they knew clinical trials were going poorly?

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That's why Hank Paulson decided to pump money directly into the banks by purchasing preferred stock.

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AUTL's rise and fall was a classic "pump 'n' dump" scheme perpetrated on stock message boards practically every day.

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Unless you own stock in one of the makers, the AGA says there is practically no difference between proton pump inhibitors.

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