[Form 4] Lantheus Holdings, Inc Insider Trading Activity

Rhea-AI Filing Summary

Paul Blanchfield, President and Director of Lantheus Holdings, Inc. (LNTH), reported an insider sale. On 08/13/2025 he disposed of 3,060 shares of common stock at $53.57 per share, leaving him with 108,214 shares beneficially owned. The filing notes the sale was executed under a Rule 10b5-1 trading plan adopted by the reporting person on 02/27/2025. The Form 4 was signed by an attorney-in-fact on 08/15/2025.

Positive

• Transaction executed under a Rule 10b5-1 trading plan, indicating pre-established, non-discretionary trading and stronger compliance documentation
• Complete disclosure of post-transaction beneficial ownership (108,214 shares) allows investors to track insider holdings

Negative

• Insider sale of 3,060 shares could be viewed as insider liquidity, though size appears limited relative to total holdings

Insights

Securities Analyst

TL;DR: Insider sale of a small portion of holdings executed under a pre-established 10b5-1 plan; not clearly material to valuation.

The reported disposal of 3,060 shares at $53.57 represents roughly 2.8% of the 111,274 shares implied prior to the sale, leaving 108,214 shares beneficially owned after the transaction. Because the sale was conducted pursuant to a Rule 10b5-1 plan adopted on 02/27/2025, this suggests the transaction followed an automated, pre-set schedule rather than a discretionary decision tied to nonpublic company developments. From an investor-impact perspective, this is typically viewed as routine insider liquidity rather than a signal of changing fundamentals. The filing provides clear numbers for outstanding insider ownership after the sale but contains no additional commentary on motivations or company events.

Corporate Governance Expert

TL;DR: Transaction adheres to governance best practices via a documented 10b5-1 plan; disclosure is complete for the reported items.

The Form 4 identifies the reporting person as President and Director and discloses the adoption date of the 10b5-1 plan, which supports compliance and provides an affirmative defense against allegations of trading on inside information. The form includes requisite details: transaction date, price, shares sold, and post-transaction beneficial ownership. There is no indication of an amendment or additional derivative transactions. This level of specificity aligns with regulatory expectations for Section 16 reporting.

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).

X

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^*

Blanchfield Paul

(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)
	President

3. Date of Earliest Transaction (Month/Day/Year)
08/13/2025

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	08/13/2025		S(1)		3,060	D	$53.57	108,214	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 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 27, 2025.

	/s/ Daniel Niedzwiecki, attorney-in-fact	08/15/2025
	** 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 did LNTH insider Paul Blanchfield report on Form 4?

The Form 4 reports a sale of 3,060 shares at $53.57 on 08/13/2025, leaving 108,214 shares beneficially owned.

Was the sale by the LNTH reporting person part of a 10b5-1 plan?

Yes. The filing states the transaction was effected pursuant to a Rule 10b5-1 trading plan adopted on 02/27/2025.

What is the reporting person's role at Lantheus Holdings (LNTH)?

The reporting person, Paul Blanchfield, is identified as President and a Director of Lantheus Holdings.

When was the Form 4 signed and by whom?

The Form 4 was signed by an attorney-in-fact, Daniel Niedzwiecki, on 08/15/2025.

Does the filing disclose any derivative transactions?

No. Table II for derivative securities contains no reported transactions in this filing.