> They can also trade run of the mill securities in large quantities without moving the market or making known that a large position shift is happening. For US

> They can also trade run of the mill securities in large quantities without moving the market or making known that a large position shift is happening. For US public equities, dark pools are still required to print all trades to the public consolidated ticker. They hide potentially huge volumes of hidden orders waiting in their order books, but they don't hide actual position shifts (trades).