Equity award, tax share disposition for Lantheus (LNTH) officer

Rhea-AI Filing Summary

Lantheus Holdings, Inc. reported that officer Daniel Niedzwiecki received 5,169 shares of common stock on March 2, 2026 at no cost, reflecting additional shares from performance-based PSUs that vested above target. On the same date, 8,259 shares were disposed of at $76.30 per share to cover tax obligations, leaving him with 83,967 directly held shares.

SEC Form 4

FORM 4

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
or Section 30(h) of the Investment Company Act of 1940

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

Check this box to indicate that a 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). See Instruction 10.

1. Name and Address of Reporting Person^*

Niedzwiecki Daniel

(Last) (First) (Middle)

C/O LANTHEUS HOLDINGS, INC.

201 BURLINGTON ROAD, SOUTH BUILDING

(Street)

BEDFORD MA 01730

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Lantheus Holdings, Inc. [ LNTH ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	See Remarks

3. Date of Earliest Transaction (Month/Day/Year)
03/02/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	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	03/02/2026		A(1)		5,169	A	$0	92,226	D
Common Stock	03/02/2026		F		8,259	D	$76.3	83,967	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 (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	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 (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (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: 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

Explanation of Responses:

1. The transaction reported in this Form 4 reflects additional shares of common stock issued by Lantheus Holdings, Inc. to the reporting person upon the vesting of relative Total Shareholder Return performance-based restricted stock units ("PSUs") that were previously granted and included in the Form 4 filed on March 6, 2023. The number of shares reported in the Form 4 reflected 100% of the target number of shares underlying the PSUs. The number of shares that actually vested under the PSUs equaled 162.8% of the target number of shares. Accordingly, the number of shares reported in this Form 4 reflects the difference between the number of shares that actually vested under the PSUs and the target number of shares originally included in the Form 4.

Remarks:

Chief Administrative Officer, General Counsel and Corporate Secretary

	/s/ Eric M. Green, attorney-in-fact	03/04/2026
	** Signature of Reporting Person	Date
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).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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FAQ

What insider transactions did Lantheus (LNTH) report for March 2, 2026?

Lantheus reported that officer Daniel Niedzwiecki received 5,169 common shares and disposed of 8,259 shares on March 2, 2026. The disposition was for tax withholding related to equity awards, not an open-market sale.

Why did Daniel Niedzwiecki receive 5,169 Lantheus (LNTH) shares?

He received 5,169 additional shares because performance-based PSUs vested above target. The footnote states relative Total Shareholder Return PSUs vested at 162.8% of the target, and these shares represent the excess over the original target amount previously reported.

What does the 8,259-share disposition by the Lantheus (LNTH) officer represent?

The 8,259-share disposition is a tax-withholding transaction at $76.30 per share. Shares were delivered to satisfy tax liability tied to equity awards, rather than being sold in the open market for discretionary portfolio reasons.

How many Lantheus (LNTH) shares does Daniel Niedzwiecki hold after these transactions?

After the March 2, 2026 transactions, Daniel Niedzwiecki directly holds 83,967 Lantheus common shares. This balance reflects the 5,169-share award from PSUs and the 8,259-share tax-withholding disposition recorded in the Form 4 filing.

What are the performance conditions behind the Lantheus (LNTH) PSU share award?

The additional shares arose from relative Total Shareholder Return performance-based restricted stock units. The number of shares that vested equaled 162.8% of the PSU target, leading to extra shares beyond the 100% target originally disclosed in a prior Form 4.