SEC Investigating Several Cases of Nasdaq 'Spoofing,' Letter Says
The Securities and Exchange Commission is investigating several cases in which people may have tried to manipulate the Nasdaq Stock Market by entering false quotes for a few seconds before canceling them, an SEC official said. 
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### Instruction: SEC Investigating Several Cases of Nasdaq 'Spoofing,' Letter Says

### Response: The Securities and Exchange Commission is investigating several cases in which people may have tried to manipulate the Nasdaq Stock Market by entering false quotes for a few seconds before canceling them, an SEC official said. 