This off-exchange activity — which happens internally at major firms or in alternative platforms known as dark pools — is on course to account for a record 51.8% of traded volume in January.
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Wall Street enters darker age with most stock trading hidden
“Theoretically the more trading that goes off-exchange, the fewer orders there are on-exchange competing to determine the best price,” he said. “This means the pricing on and off-exchange could get worse.”
