The Securities and Exchange Commission voted unanimously Tuesday to require large traders to register and to share more information. The rule, yet another measure in response to the Flash Crash of May 2010, will take effect in 60 days, with traders given an additional two months to begin registering.

The rule will apply to investors that trade more than two million shares or $20 million a day, or 20 million shares or $200 million a month. The SEC will assign such traders a unique identification number that they will have to share with their broker-dealer, which will maintain transaction records for these traders.

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