Lantheus (LNTH) officer gets 36,692 stock units, with tax share disposal

Rhea-AI Filing Summary

Lantheus Holdings, Inc. officer Daniel Niedzwiecki received an equity award of 36,692 shares of common stock on March 5, 2026 at a stated price of $0.00 per share. This consists of 18,346 restricted stock units that vest in equal installments over three years and 18,346 performance-based PSUs that cliff vest after a three-year performance period, with the final PSU amount adjustable between 0% and 200% of target based on performance. On the same date, 1,283 shares were disposed of at $76.31 per share to cover taxes, leaving him with 119,376 shares of common stock held directly following these transactions.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Niedzwiecki Daniel

Role See Remarks

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	36,692	$0.00	--
Tax Withholding	Common Stock	1,283	$76.31	$98K

Holdings After Transaction: Common Stock — 120,659 shares (Direct)

Footnotes (1)

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Form 4 Insider Transactions: What Each Field Means →

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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)
03/05/2026

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	03/05/2026		A(1)		36,692	A	$0	120,659	D
Common Stock	03/05/2026		F		1,283	D	$76.31	119,376	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. Consists of 18,346 restricted stock units that vest in equal installments over a three-year period and 18,346 Total Shareholder Return performance-based restricted stock units ("PSUs") that cliff vest following a three-year performance period. The amount of PSUs included in this Report reflects the target award; however, the ultimate award size can range from 0% to 200% of the target based on the actual performance achieved at the end of the performance period.

Remarks:

Chief Administrative Officer, General Counsel and Corporate Secretary

	/s/ Eric M. Green, attorney-in-fact	03/09/2026
	** 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What stock award did Lantheus (LNTH) officer Daniel Niedzwiecki receive?

Daniel Niedzwiecki received an equity award of 36,692 Lantheus common shares. The grant includes 18,346 time-based restricted stock units and 18,346 performance-based PSUs, providing both service-linked and performance-linked compensation over a three-year period.

How do the new Lantheus (LNTH) restricted stock units for Daniel Niedzwiecki vest?

18,346 restricted stock units granted to Daniel Niedzwiecki vest in equal installments over three years. This structure rewards continued employment, spreading ownership benefits over time rather than delivering the full award immediately at grant.

How are Daniel Niedzwiecki’s Lantheus (LNTH) PSUs structured in this Form 4 filing?

Daniel Niedzwiecki received 18,346 Total Shareholder Return PSUs that cliff vest after a three-year performance period. The ultimate PSU payout can range from 0% to 200% of the target amount, depending entirely on performance achieved over that period.

Why did Daniel Niedzwiecki dispose of 1,283 Lantheus (LNTH) shares?

He disposed of 1,283 common shares at $76.31 per share as a tax-withholding transaction. The shares were delivered to satisfy exercise price or tax liabilities associated with equity awards, rather than being sold as an open-market trade.

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

Following the March 5, 2026 transactions, Daniel Niedzwiecki holds 119,376 Lantheus common shares directly. This figure reflects both the new equity award and the 1,283-share tax-withholding disposition reported in the same Form 4.

Were the newly granted Lantheus (LNTH) shares to Daniel Niedzwiecki free or purchased?

The 36,692 newly reported shares were granted at a stated price of $0.00 per share. They represent restricted stock units and performance-based PSUs awarded as compensation, not shares bought by Niedzwiecki in a cash purchase.