(Bloomberg) After years of debate, rancor and flagrant opportunism, the world’s toughest restrictions on dark trading come into force Monday. Exactly 755 stocks listed in European Union countries, including 321 in the U.K., are banned from trading on dark pools for the next six months, according to a list published by the bloc’s markets regulator on March 7. The region’s fund managers face a dilemma: Trade on stock exchanges and watch prices move against them, or send their orders to new and untested services such as trading venues run by banks and high-frequency traders.

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