Acco Brands says that federal antitrust regulators at the U.S. Department of Justice have ended the waiting period for its acquisition of MeadWestvaco Corp.'s consumer and office product division.

Acco Brands added that a waiting period for Canadian antitrust authorities to review the merger has ended. Now that antitrust regulators have stepped aside, the deal is still subject to shareholder approval. MeadWestvaco announced in November that it would spin off its consumer and office products division to Acco in a deal worth $860 million.

The acquisition is expected to close in the second quarter of the year. After the deal is completed, MeadWestvaco shareholders will own 50.5 percent of the combined company. The combined business will be managed by Acco, but MeadWestvaco will select two directors to join its board of directors.