The widely reported, but not yet announced, $3.9 billion sale of Putman Investments to Montreal-based Power Corp. could mean the end of a bumpy road for the Boston-based investment firm and its New York-based parent, Marsh & McLennan.

And while it will provide the Canadian company with long-desired access to the large and growing American retirement market, taking over the reins is going to require Power to pay close attention to Putnam's existing 401(k) business.

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