Four federal regulators on Friday announced they would give commenters an additional month to weigh in on sweeping restrictions to banks' proprietary trading vehicles.

Institutions now have until Feb. 13 to comment on the agencies' fall proposal for implementing the so-called Volcker Rule, a key section of the Dodd-Frank Act. The provision — named for former Federal Reserve Board Chairman Paul Volcker, who originated the idea — severely limits the ability of banks and other financial companies to do their own trading or be affiliated with hedge funds and private-equity groups. The comment period was originally going to end Jan. 13.

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