Daniel Niedzwiecki - Jun 13, 2025 Form 4 Insider Report for Lantheus Holdings, Inc. (LNTH)

Role: Chief Administrative Officer, General Counsel and Corporate Secretary
Signature: /s/ Eric M. Green, attorney-in-fact
Stock symbol: LNTH
Transactions as of: Jun 13, 2025
Transactions value $: -$472,440
Form type: 4
Date filed: 6/17/2025, 04:31 PM
Previous filing: Jun 9, 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Niedzwiecki Daniel	Chief Administrative Officer, General Counsel and Corporate Secretary	C/O LANTHEUS HOLDINGS, INC., 201 BURLINGTON ROAD, SOUTH BUILDING, BEDFORD	/s/ Eric M. Green, attorney-in-fact	2025-06-17	0001861113

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	LNTH	Common Stock	Sale	-$472K	-6K	-6.45%	$78.74	87.1K	Jun 13, 2025	Direct	F1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Buy Plan / Sale Plan: These are also open market purchases/sales of shares, but in this case the transaction is part of a trading plan. Rule 10b5-1 allows insiders to setup a trading plan to buy/sell stocks over a certain period of time. Since the purchases/sales are predetermined, this protects the insiders from violating insider trading law.

Transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

Explanation of Responses:

Id	Content
F1	The transaction reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2025.

Remarks:

Chief Administrative Officer, General Counsel and Corporate Secretary