Vox tiene un post sobre un tema donde la libre y la tortuga no condicen con su Fabula.
According to the Securities and Exchange Commission, the number of active dark pools dealing in stocks on major US stock markets trebled to 29 in 2009 from about 10 in 2002. For April to June 2009, the total dark pools volume was about 7.2% of the total volumes of all US exchanges.
Dark pools are a private or alternative trading system that allows participants to transact without displaying quotes publicly. Orders are anonymously matched and not reported to any entity, even the regulators (Younglai and Spicer 2009). Thus, the mainstream exchange-traded market does not have any clue about the volume of transactions happening in this parallel market or the prices at which they are being executed. Obviously, price discovery on the mainstream market, without dark pools information, becomes inefficient.
But what is unacceptable is the practice of allowing a privileged minority to flash trade to track the reaction with high-speed processing capacity and the algorithm that can take advantage of the reaction to reap benefits – as this is akin to front-running. It is an example of high-frequency trading system with knowledge of asymmetric information that confuses common investors by simultaneously issuing and cancelling orders and entices them to shell out more for a particular security and, thus, squeezes out their profits.
It was the Chicago Board Options Exchange which pioneered flash orders early this decade to increase its execution speed (Patterson et al. 2009). Flash orders remained in the dark until a newspaper report in 2009 blew the whistle on how Goldman Sachs had made a killing through this route. According to Rosenblatt, flash trading accounted for about 2.4% of the total US stock volumes in June 2009.
Por ultimo, una de las fuentes de este articulo es un trabajo de PWC, Dark Pools of liquidity