Plenty of companies are grappling with the aftermath of the storm, including Knight Capital, a trading firm that had to direct clients to reroute orders after its backup power system went down Wednesday.

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The SEC has already proposed a number of changes designed to address their growing influence, including extra restrictions on broker-dealers that provide direct market access to high frequency traders, a trader tracking system for large traders, circuit breakers that would slow trading in individual stocks if they fall more than 10%, and new rules for off-exchange trading venues.

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