The Dark Pool
The Island-Renaissance fusion was a vision of the future in which high-speed AI-guided robots would operate on lightning-fast electronic pools, controlling the daily ebb and flow of the market. The AI Bots poured their valuable liquidity into Island, which, in turn, made it possible for the Bots to operate at high frequencies. They fed off one another, creating a virtuous cycle that would become unstoppable. Little-known outfits such as Timber Hill, Tradebot, RGM, and Getco would soon start trading on Island, forming the emergent ganglia of a new space-age trading organism driven by machines. Tricked-out artificial intelligence systems designed to scope out hidden pockets in the market where they could ply their trades powered many of these systems.
http://www.zerohedge.com/news/dark-pool-truth-about-what-really-goes-stock-market-part–4