NEW YORK, Dec 19- A relatively unknown German holding company this week made its third move on a coffee company as it tries to assemble a juggernaut that can challenge chains like Starbucks Corp and Dunkin' Brands Group Inc.
Dec 17- The Benckiser group agreed to buy Caribou Coffee Co Inc for about $340 million in a deal that would boost the German investment company's position as the No. 2 U.S. purveyor of premium coffee, but still well behind Starbucks Corp..