Sec Form 4 Filing - Maeusli Heinz Christoph @ Lantheus Holdings, Inc. - 2020-06-19

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Maeusli Heinz Christoph 2. Issuer Name and Ticker or Trading Symbol Lantheus Holdings, Inc. [ LNTH] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O LANTHEUS HOLDINGS, INC., 331 TREBLE COVE ROAD 3. Date of Earliest Transaction (MM/DD/YY) 06/19/2020 (Street) NORTH BILLERICA, MA01862 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common stock 06/19/2020 A 5,981 A $ 0 5,981 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Non-Qualified Stock Option (Right to Buy) $ 16.17 06/19/2020 A 17,481 06/19/2020 12/13/2029 Common stock 17,481 ( 1 ) 17,481 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Maeusli Heinz Christoph C/O LANTHEUS HOLDINGS, INC. 331 TREBLE COVE ROAD NORTH BILLERICA, MA01862 X Signatures /s/ Daniel Niedzwiecki, attorney-in-fact 06/23/2020 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Received in exchange for a non-qualified stock option to acquire 56,393 shares of Progenics Pharmaceuticals, Inc. ("Progenics") for $5.01 per share, in connection with the merger of Progenics pursuant to the Amended and Restated Agreement and Plan of Merger (the "Merger Agreement"), dated as of February 20, 2020, by and among Lantheus Holdings, Inc. (the "Company"), Plato Merger Sub, Inc., a Delaware corporation and a wholly owned subsidiary of the Company ("Merger Sub"), and Progenics, pursuant to which Merger Sub merged with and into Progenics, with Progenics surviving as a wholly owned subsidiary of the Company (the "Merger").

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

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