Trading of US equities on “dark pools” has grown by almost a half in the past three years to account for nearly a third of total market volume, according to research that underscores the challenge facing international regulators.
The shift from transparent public exchanges has highlighted growing concern among asset managers and global regulators about off-exchange trading, where prices are reported only after deals are executed.
Such venues allow investors to trade large blocks of shares anonymously, with prices posted publicly only after trades are done.
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