Front run.

Front running is the unethical practice of a stockbroker executing orders on a security for its own account while taking advantage of advance knowledge of pending orders from its customers. The front running broker either buys for its own account before filling customer buy orders that drive up the price, or sells for its own account before filling customer sell orders that drive down the price. Front running is considered unethical since the broker is making a profit at the direct expense of its own customers.[1]

In 2003, several hedge fund and mutual fund companies became embroiled in an illegal late trading scandal made public by a complaint against Bank of America brought by New York Attorney General Eliot Spitzer. A resulting U.S. Securities and Exchange Commission investigation into allegations of front-running activity implicated Edward D. Jones & Co., Inc., Goldman Sachs, Morgan Stanley, Strong Mutual Funds, Putnam Investments, Invesco, and Prudential Securities.[2]