The credit crunch may be slowing down M&A activity, but venture capitalists have returned from their vacations ready for dealmaking.

Columbia Capital of Alexandria, Va., M/C Venture Partners of Boston, Oak Investment Partners of Westport, Conn., Battery Ventures of Wellesley Hills, Mass., and Centennial Ventures of Denver kicked off the end of summer surge in dealmaking with the year's largest funding, a $225 million investment in Zayo Bandwidth Inc.

Since the Aug. 31 financing venture firms have opened their wallets to invest another $450 million in just the last seven days.

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