Dark pools represent roughly 11% of trading volume, corresponding to 1,888,478 share of AAPL on May 9. In this case the trade gains 50% of the price dislocation. After 1.5 milliseconds, the trader can sell it for $531.5 in the dark pool. If some such regular traders have placed an order to trade at mid-price in a dark pool, then a faster trader can buy the stock at $531 in dark pool when the synthetic NBBO gets updated. In the first 1.5 milliseconds, slower traders are not aware of the price change. This changes the mid-price from $531 to $531.5. No, I’m not particularly sporty quanto costa il viagra generico in farmaciaĪssume BATS updates AAPL bid price from $530 to $531, and the ask price remains at $532.
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