Spoofing - depressing price ?Spoofing is a disruptive algorithmic trading activity employed by traders to outpace other market participants and to manipulate markets. Spoofers feign interest in trading futures, stocks, and other products in financial markets creating an illusion of the demand and supply of the traded asset.
Its illegal and CIBC/RBC are being sued for allowing it to happen on their platform. Article in G&M October 22nd.