Market Manipulation Complaints Are Common But Prosecutions Rare

Traders work on the floor of the New York Stock Exchange in New York, U.S.

Jin Lee/Bloomberg
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CME Group Inc., the operator of the biggest U.S. futures market, has a spoofing problem.

Complaints about the practice -- using fake orders to manipulate prices, then withdrawing them -- are widespread. Enforcement is lax, and prosecutions are rare.