Lantheus (LNTH) executive delivers shares to cover tax obligations

Rhea-AI Filing Summary

Lantheus Holdings, Inc. executive Daniel Niedzwiecki reported a small tax-related share disposition. On April 17, 2026, 1,911 shares of Common Stock were delivered at $83.82 per share to satisfy tax obligations, a non-market transaction. Following this, he directly owned 117,465 shares, indicating the move was a routine withholding rather than an open-market sale.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Niedzwiecki Daniel

Role See Remarks

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	1,911	$83.82	$160K

Holdings After Transaction: Common Stock — 117,465 shares (Direct, null)

Footnotes (1)

Key Figures

Shares disposed for tax withholding: 1,911 shares Transaction share value: $83.82 per share Shares held after transaction: 117,465 shares

3 metrics

Shares disposed for tax withholding 1,911 shares Tax-withholding disposition on April 17, 2026

Transaction share value $83.82 per share Value used for tax-withholding disposition

Shares held after transaction 117,465 shares Direct ownership following Form 4 event

Key Terms

Form 4, tax-withholding disposition, Common Stock, Payment of exercise price or tax liability by delivering securities

4 terms

Form 4 regulatory

"INSIDER FILING DATA (Form 4):"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

tax-withholding disposition financial

"transaction_action": "tax-withholding disposition""

A tax-withholding disposition is an event or transaction—such as selling or transferring securities, exercising options, or receiving compensation—that triggers a requirement to hold back part of the payment and remit it to tax authorities. It matters to investors because it reduces the cash they receive immediately and can change the timing and amount of taxable income, like a cashier taking a portion of your sale proceeds to pay taxes before you get the rest.

Common Stock financial

""security_title": "Common Stock""

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

Payment of exercise price or tax liability by delivering securities financial

"transaction_code_description": "Payment of exercise price or tax liability by delivering securities""

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 MASSACHUSETTS 01730

(City) (State) (Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/17/2026

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

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

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

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	04/17/2026		F		1,911	D	$83.82	117,465	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:

Remarks:

Chief Administrative Officer, General Counsel and Corporate Secretary

	/s/ Eric M. Green, attorney-in-fact	04/21/2026
	** 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.
* Form 4: SEC 1474 (03-26)

FAQ

What did Lantheus (LNTH) executive Daniel Niedzwiecki report on this Form 4?

Daniel Niedzwiecki reported a tax-withholding disposition of Lantheus common stock. He delivered shares to cover tax obligations rather than selling them on the open market, a routine administrative transaction often linked to equity compensation events.

How many Lantheus (LNTH) shares were involved in Niedzwiecki’s tax withholding?

The filing shows 1,911 shares of Lantheus common stock were delivered for tax withholding. These shares were valued at $83.82 each, reflecting a non-discretionary transfer to satisfy tax liabilities tied to equity compensation.

What was the price per share for the Lantheus (LNTH) tax-withholding transaction?

The tax-withholding disposition used a price of $83.82 per share. This figure is used to determine the value of the 1,911 shares delivered to cover the executive’s tax obligations rather than indicating an open-market trade price.

How many Lantheus (LNTH) shares does Niedzwiecki hold after this Form 4 transaction?

After the transaction, Daniel Niedzwiecki directly held 117,465 shares of Lantheus common stock. This remaining position shows the tax-withholding event affected only a small portion of his overall holdings in the company.

Was this Lantheus (LNTH) Form 4 a market sale or a routine tax event?

The Form 4 describes a routine tax event, not a market sale. Shares were disposed of as a “tax-withholding disposition,” meaning they were delivered to satisfy tax liabilities, rather than sold through open-market transactions.