Lantheus Holdings, Inc. (together with its subsidiaries, the “Company” or “we”) is filing this Conflict Minerals Report for the 2015 calendar year (this “Report”) in accordance with Rule 13p-1 under the Securities Exchange Act of 1934, as amended, and Form SD (collectively, the “Rule”). Rule 13p-1 imposes certain due diligence and reporting obligations on public companies that manufacture (or contract to manufacture) any products for which cassiterite, columbite-tantalite, gold, wolframite and their derivatives limited to tin, tantalum, tungsten or gold (“conflict minerals”) are necessary to the functionality or production of those products (conflict minerals meeting this criteria are referred to as “necessary conflict minerals”). The Rule generally imposes heightened due diligence and reporting obligations if a public company knows or has reason to believe that those necessary conflict minerals originated or may have originated in the Democratic Republic of the Congo (“DRC”) or any of the adjoining countries (collectively, the “Covered Countries”).