Chi-X, Turquoise and Bats, among others, have all emerged in the directive's wake to challenge traditional exchanges such as the LSE and Deutsche Borse.
The migration of share trading from regulated platforms to dark pools is to be examined by the European Commission as part of a wider review of the Markets in Financial Instruments Directive (MiFID).
Chi-X, Turquoise and Bats, among others, have all emerged in the directive's wake to challenge traditional exchanges such as the
LSE and Deutsche Borse.
However, McCreevy says there also seems to have been a "significant migration" of trading to unregulated over-the-counter broker-dealer venues where dark pools of liquidity have built up.
"This gives rise to questions as to whether there are unfair commercial advantages for the operators of these venues and whether the trend undermines price discovery, market integrity and efficiency for the market as a whole," says McCreevy.
Dark pools have come under increasing scrutiny from regulators in recent months, with both the Securities and Exchange Commission in the US, and the UK's FSA, looking into their impact on market transparency and integrity.
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