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Exhibit 32.1

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

 

Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, Mary Anne Heino, the Chief Executive Officer, and Robert J. Marshall, Jr., the Chief Financial Officer, of Lantheus Holdings, Inc. (the “Company”), hereby certify, that, to their knowledge:

1.
The Quarterly Report on Form 10-Q for the period ended March 31, 2026 (the “Report”) of the Company fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

 

2.
The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

 

 

Date: May 7, 2026

 

 

 

 

 

 

/s/ MARY ANNE HEINO

Name:

Mary Anne Heino

Title:

Chief Executive Officer and Chairperson of the Board

 

(Principal Executive Officer)

Date: May 7, 2026

 

 

 

 

 

/s/ ROBERT J. MARSHALL, JR.

Name:

Robert J. Marshall, Jr.

Title:

Chief Financial Officer and Treasurer

 

 

(Principal Financial Officer)

 

A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.