UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 14A
Proxy Statement Pursuant to Section 14(a) of the
Securities Exchange Act of 1934
(Amendment No.    )

Filed by the Registrant  ☒                            Filed by a Party other than the Registrant  ☐
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☐	 	Preliminary Proxy Statement	
☐	 	Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))	
☐	 	Definitive Proxy Statement	
☒	 	Definitive Additional Materials	
☐	 	Soliciting Material under §240.14a-12	
LANTHEUS HOLDINGS, INC.
(Name of Registrant as Specified In Its Charter)
 
(Name of Person(s) Filing Proxy Statement, if other than the Registrant)
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Important Notice Regarding the Availability of Proxy Materials for the Stockholder Meeting
to be held on April 27, 2017, for Lantheus Holdings, Inc.
This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. We encourage you to access and review all of the important information contained in the proxy materials before voting. To view the proxy statement and annual report, go to  www.proxydocs.com/lnth . To submit your proxy while visiting this site, you will need the 12 digit control number in the box below.

 	 	 	 	 	  	Under United States Securities and Exchange Commission rules, proxy materials do not have to be delivered in paper. Proxy materials can be distributed by making them available on the Internet. We have chosen to use these procedures for our 2017 Annual Meeting and need YOUR participation.
 
If you want to receive a paper or e-mail copy of the proxy materials, you must request one. There is no charge to you for requesting a copy. In order to receive a paper package in time for this year’s annual meeting, please make this request on or before April 17, 2017.	 	 	 	

 	 	 	 	 	  	 	 	 	 	 	 	 	

 	 	 	 	 	  	 	 	 	 	 	 	 	 	 	 	

 	 	 	 	 	  	 	 	 	 	 	 	 	 	 	 	 	 	 	

 	 	 	 	 	 	
 	 	For a Convenient Way to VIEW Proxy Materials	 	 	 	
 	 	– and –	 	 	 	 	
 	 	VOTE Online go to: www.proxydocs.com/lnth	 	 	 	 	
Proxy Materials Available to View or Receive:
1. Annual Report
2. Proxy Statement
Printed materials may be requested by one of the following methods:

 	 	 
INTERNET
www.investorelections.com/lnth	 	 	 	 
TELEPHONE
(866) 648-8133	 	 	 	 
*E-MAIL
paper@investorelections.com	 	 	 	
 	 	 
You must use the 12 digit control number
located in the shaded gray box below.	 	*	 	If requesting material by e-mail, please send a blank e-mail with the 12 digit control number (located below) in the subject line. No other requests, instructions or other inquiries should be included with your e-mail requesting material.	 	 	 	

 	 	 	 	 	 	 	 	 	 	
Lantheus Holdings, Inc., Notice of Annual Meeting	 	
 	 	 	 	 	 	
 	 	 	 	Date:	 	Thursday, April 27, 2017	 	 	 	
 	 	 	 	Time:	 	11:00 A.M. (Eastern Time)	 	 	 	 	
 	 	 	 	Place:	 	DoubleTree - Bedford Glen, 44 Middlesex Turnpike, Bedford, MA 01730	 	 	
 
  The Board of Directors Recommends a Vote FOR all the nominees listed in proposal 1 and for proposals 2, 3 and 4.	 	 	
  1.	 	To elect three Class II directors to serve until the 2020 Annual Meeting of Stockholders:	 	 	
 	 	01 James C. Clemmer	 	 	 	 	
 	 	02 Julie H. McHugh	 	 	 	 	
 	 	03 Dr. Frederick Robertson	 	 	 	 	

 	 	 	
  2.	 	To approve the Amendment to the Lantheus Holdings, Inc. 2015 Equity Incentive Plan to increase the number of shares of common stock reserved for issuance thereunder by 1,200,000 shares.	 	 	
 	 	 	
  3.	 	To approve the Lantheus Holdings, Inc. 2017 Employee Stock Purchase Plan.	 	 	
 	 	 	
  4.	 	To ratify the appointment of Deloitte & Touche LLP as the Company’s independent registered public accounting firm for the fiscal year ending on December 31, 2017.	 	 	
Vote In-Person Instructions: While we encourage stockholders to vote by the means indicated above, a stockholder is entitled to vote in person at the Annual Meeting. If you wish to vote your shares at the Annual Meeting, please register with the Inspector of Elections at the desk marked “Stockholder Registration” at the entrance to receive a ballot. Proper photo ID is required. Ballots should be returned to the Inspector of Elections in order to be counted. Additionally, a stockholder who has submitted a proxy before the meeting, may revoke that proxy in person at the Annual Meeting.