Lantheus Holdings (LNTH) CEO awarded shares, covers taxes in stock

Rhea-AI Filing Summary

Lantheus Holdings Executive Chair and CEO Mary Anne Heino reported a mix of equity award vesting and share withholding for taxes. She acquired 32,105 shares of common stock at $0 per share from the vesting of performance-based restricted stock units tied to relative total shareholder return, after the award paid out at 162.8% of its target.

To cover tax obligations on this vesting, 41,916 shares of common stock were disposed of at $76.30 per share through share withholding, a non-open-market transaction. After these transactions, she directly owns 323,124 common 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^*

Heino Mary Anne

(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)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Executive Chair and CEO

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)		32,105	A	$0	365,040	D
Common Stock	03/02/2026		F		41,916	D	$76.3	323,124	D
Common Stock								78,153	I	By The Mary Anne Fennell Heino Revocable Trust - 2018
Common Stock								8,618	I	By Heino Irrevocable Trust
Common Stock								179,300	I	By The Heino 2024 Family Trust

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.

	/s/ Eric M. Green, attorney-in-fact	03/04/2026
	** Signature of Reporting Person	Date
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FAQ

What insider transactions did LNTH CEO Mary Anne Heino report on this Form 4?

Mary Anne Heino reported a mix of equity award vesting and tax-related share withholding. She acquired 32,105 Lantheus common shares from performance-based RSUs and had 41,916 shares withheld at $76.30 each to satisfy tax obligations, all reported as direct ownership changes.

How many Lantheus (LNTH) shares did the CEO receive from performance-based awards?

The CEO received 32,105 Lantheus common shares at $0 per share from the vesting of performance-based restricted stock units. These units vested based on relative total shareholder return, with final vesting equaling 162.8% of the target number of shares originally granted.

Why were 41,916 Lantheus (LNTH) shares disposed of in this Form 4?

The 41,916 shares were disposed of to cover tax liabilities related to the vesting of equity awards. They were withheld at $76.30 per share, classified under code F, which reflects payment of taxes or exercise price by delivering or withholding securities rather than an open-market sale.

What is Mary Anne Heino’s direct Lantheus (LNTH) share ownership after these transactions?

After the reported transactions, Mary Anne Heino directly holds 323,124 shares of Lantheus common stock. This figure reflects both the additional 32,105 vested shares from performance-based awards and the 41,916 shares withheld to satisfy tax obligations tied to those vestings.

How did PSU performance affect the CEO’s Lantheus (LNTH) share vesting?

The performance-based restricted stock units vested above target, at 162.8% of the original target number of shares. The 32,105 shares reported represent the incremental difference between actual shares vested and the 100% target amount previously reported when the PSUs were initially granted.