Amazon.com Inc. on Wednesday cleared two of the biggest hurdles it needed to close its $13.7 billion acquisition of Whole Foods Market Inc, with approvals from a U.S. regulator and the grocery chain's shareholders.

The U.S. Federal Trade Commission said in a statement it would not pursue its investigation into the proposed merger further after reviewing whether the deal would substantially lessen competition or constituted an unfair method of competition.

Amazon said it was on track to close the merger, expected sometime this year. Earlier on Wednesday, Whole Foods said its shareholders voted in favor of the deal.