on the New York Stock Exchange (NYSE) had degraded to as low as 84% (meaning we were able to, on average, trade 84 shares out of every 100 shares that were quoted at the time we attempted to trade).

Tired of seeing volumes flood unlit trading venues, the New York Stock Exchange is taking a page from the dark pools' playbook. Call it “NYSE vs. the Internalizers, Round Two.” In what amounts to its ...