EU Moving to Curb High-Frequency Trading

European legislators are backing rules to keep the price increment for securities from being too small, require mandatory testing of trading algorithms, and more.

High-frequency traders in the European Union (EU) are set to face some of the toughest rules in the world, as legislators backed rules that they said would curb volatility and make markets safer.

The limits include standards meant to keep the price increment for securities from being too small, mandatory tests of trading algorithms, and requirements that market makers provide liquidity for a set number of hours each day. The curbs are part of revamped EU markets legislation approved by the European Parliament voting in Strasbourg, France.

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