Mylan NV’s three-way deal drama is putting the spotlight on a fourth player: Abbott Laboratories (NYSE: ABT).

Abbott Park, Illinois-based Abbott is the largest holder of Mylan after swapping its established-markets drug business for Mylan stock in February. Since then, Mylan shares have surged more than 20 percent as the drugmaker pursues Perrigo Co. and fends off advances from Teva Pharmaceutical Industries Ltd.

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