X0206 3 2015-06-24 0 0001521036 Lantheus Holdings, Inc. LNTH 0001237200 DUFFY MICHAEL P C/O LANTHEUS HOLDINGS, INC. 331 TREBLE COVE ROAD NORTH BILLERICA MA 01862 0 1 0 0 VP, General Counsel, Secretary Common Stock 39145 D Stock Option (right to buy) 5.62 2018-04-04 Common Stock 44484 D Stock Option (right to buy) 5.62 2018-04-04 Common Stock 17170 D Stock Option (right to buy) 18.66 2023-08-05 Common Stock 24911 D This option is currently exercisable. On April 4, 2008, the reporting person was granted this option to purchase 44,484 shares of Common Stock. This option vests in five equal annual installments based on the level of LNTH's satisfaction of certain performance criteria for each of fiscal years 2008, 2009, 2010, 2011 and 2012. A certain level of the performance criteria for each of fiscal years 2008 and 2009 was met, resulting in vesting of this option as to 17,170 shares. The shares subject to this option vest in four equal annual installments, beginning August 5, 2014. Exhibit List Exhibit 24 - Power of Attorney /s/ Michael P. Duffy 2015-06-24