[Form 4] Lantheus Holdings, Inc Insider Trading Activity

Rhea-AI Filing Summary

Farallon Partners and affiliated reporting persons disclosed sales of Lantheus Holdings, Inc. (LNTH) shares that substantially reduced their indirect holdings. The Form 4 shows a sale of 41,000 shares on 08/19/2025 at $55.34 and a subsequent sale of 3,365,000 shares on 08/20/2025 at a weighted-average price of $56.15 (execution prices ranged $56.14 to $56.55). The filing reports indirect beneficial ownership falling from 6,842,227 shares to 3,477,227 shares following the transactions. The Form includes detailed footnotes clarifying that the reported shares are held by Farallon-affiliated funds, that general partners and managing members may be deemed beneficial owners only to the extent of pecuniary interest, and that parallel Form 4 filings were made for additional reporting persons.

Positive

• Timely and detailed disclosure of share dispositions with specific dates and prices, including weighted-average and range.
• Clear footnotes explaining that shares are held by Farallon-affiliated funds and clarifying beneficial ownership and parallel filings.

Negative

• Substantial reduction in indirect holdings: combined sale of 3,406,000 shares reduced reported indirect stake from 6,842,227 to 3,477,227 shares.
• Large block sale on 08/20/2025: 3,365,000 shares sold at a weighted-average price of $56.15, representing the majority of the reduction.

Insights

Securities Analyst

TL;DR: Large block sales by Farallon materially reduced its reported indirect stake in LNTH within two days.

The filing documents a combined disposition of 3,406,000 common shares across 08/19/2025 and 08/20/2025, reducing indirect holdings from 6,842,227 to 3,477,227 shares. The August 20 sale of 3,365,000 shares at a weighted-average price of $56.15 represents the bulk of the reduction. For investors, such a sizable disposal by an institutional holder is a material change in ownership that can affect perceived supply and demand. The disclosure is specific on prices and includes footnotes clarifying ownership structure and parallel filings, which supports transparency.

Corporate Governance Expert

TL;DR: Form 4 is compliant and detailed; footnotes appropriately explain group and fund relationships.

The submission includes explicit footnotes about the Farallon Funds, Farallon General Partners, and managing members, and it references parallel Form 4 filings where required due to filing limits. Signatures and dates are present. The filing properly distinguishes indirect ownership and disclaims beneficial ownership except to the extent of pecuniary interest. From a governance and disclosure perspective, the Form 4 meets Section 16 transparency requirements and provides sufficient detail for stakeholders to understand the change in ownership position.

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

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X

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^*

FARALLON PARTNERS L L C/CA

(Last) (First) (Middle)

ONE MARITIME PLAZA, SUITE 2100

(Street)

SAN FRANCISCO CA 94111

(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	X	10% Owner
	Officer (give title below)	X	Other (specify below)
			Member of a Group Owning 10%

3. Date of Earliest Transaction (Month/Day/Year)
08/19/2025

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

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

	Form filed by One Reporting Person
X	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	08/19/2025		S		41,000	D	$55.34	6,842,227	I	See Footnotes(1)(2)(3)(4)(5)
Common Stock	08/20/2025		S		3,365,000	D	$56.15(6)	3,477,227	I	See Footnotes(1)(2)(3)(4)(5)

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

1. Name and Address of Reporting Person^*

FARALLON PARTNERS L L C/CA

(Last) (First) (Middle)

ONE MARITIME PLAZA, SUITE 2100

(Street)

SAN FRANCISCO CA 94111

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)	X	Other (specify below)
			Member of a Group Owning 10%

1. Name and Address of Reporting Person^*

Dapice Joshua J.

(Last) (First) (Middle)

C/O FARALLON CAPITAL MANAGEMENT, L.L.C.

ONE MARITIME PLAZA, SUITE 2100

(Street)

SAN FRANCISCO CA 94111

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

	Director		10% Owner
	Officer (give title below)	X	Other (specify below)
			Member of a Group Owning 10%

1. Name and Address of Reporting Person^*

Dreyfuss Philip D

(Last) (First) (Middle)

C/O FARALLON CAPITAL MANAGEMENT, L.L.C.

ONE MARITIME PLAZA, SUITE 2100

(Street)

SAN FRANCISCO CA 94111

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

	Director		10% Owner
	Officer (give title below)	X	Other (specify below)
			Member of a Group Owning 10%

1. Name and Address of Reporting Person^*

Dunn Hannah E.

(Last) (First) (Middle)

C/O FARALLON CAPITAL MANAGEMENT, L.L.C.

ONE MARITIME PLAZA, SUITE 2100

(Street)

SAN FRANCISCO CA 94111

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

	Director		10% Owner
	Officer (give title below)	X	Other (specify below)
			Member of a Group Owning 10%

1. Name and Address of Reporting Person^*

FRIED RICHARD B

(Last) (First) (Middle)

C/O FARALLON CAPITAL MANAGEMENT, L.L.C.

ONE MARITIME PLAZA, SUITE 2100

(Street)

SAN FRANCISCO CA 94111

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

	Director		10% Owner
	Officer (give title below)	X	Other (specify below)
			Member of a Group Owning 10%

1. Name and Address of Reporting Person^*

Gehani Varun N

(Last) (First) (Middle)

C/O FARALLON CAPITAL MANAGEMENT, L.L.C.

ONE MARITIME PLAZA, SUITE 2100

(Street)

SAN FRANCISCO CA 94111

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

	Director		10% Owner
	Officer (give title below)	X	Other (specify below)
			Member of a Group Owning 10%

1. Name and Address of Reporting Person^*

Giauque Nicolas

(Last) (First) (Middle)

C/O FARALLON CAPITAL MANAGEMENT, L.L.C.

ONE MARITIME PLAZA, SUITE 2100

(Street)

SAN FRANCISCO CA 94111

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

	Director		10% Owner
	Officer (give title below)	X	Other (specify below)
			Member of a Group Owning 10%

1. Name and Address of Reporting Person^*

Kim David T

(Last) (First) (Middle)

C/O FARALLON CAPITAL MANAGEMENT, L.L.C.

ONE MARITIME PLAZA, SUITE 2100

(Street)

SAN FRANCISCO CA 94111

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

	Director		10% Owner
	Officer (give title below)	X	Other (specify below)
			Member of a Group Owning 10%

1. Name and Address of Reporting Person^*

Linn Michael G

(Last) (First) (Middle)

C/O FARALLON CAPITAL MANAGEMENT, L.L.C.

ONE MARITIME PLAZA, SUITE 2100

(Street)

SAN FRANCISCO CA 94111

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

	Director		10% Owner
	Officer (give title below)	X	Other (specify below)
			Member of a Group Owning 10%

1. Name and Address of Reporting Person^*

Luo Patrick (Cheng)

(Last) (First) (Middle)

C/O FARALLON CAPITAL MANAGEMENT, L.L.C.

ONE MARITIME PLAZA, SUITE 2100

(Street)

SAN FRANCISCO CA 94111

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

	Director		10% Owner
	Officer (give title below)	X	Other (specify below)
			Member of a Group Owning 10%

Explanation of Responses:

1. The entities and individuals identified in the footnotes of this Form 4 may be deemed members of a group holding equity securities of Lantheus Holdings, Inc. (the "Issuer"). The filing of this Form 4 and any statements included herein shall not be deemed to be an admission that such entities and individuals are members of such a group.

2. Since the number of reporting persons that may be listed on a Form 4 is limited, the entities and individuals listed in these footnotes that are not reporting persons on this Form 4 are filing an additional Form 4 on the date hereof as reporting persons with respect to the securities described herein (the "Parallel Form 4"). Information regarding these entities and individuals is included in this Form 4 for purposes of clarification and convenience only, and is duplicative of the information reported in the Parallel Form 4.

3. The amount of securities shown in this row is held directly by certain investment funds affiliated with the reporting persons (the "Farallon Funds").

4. Farallon Partners, L.L.C. and certain affiliated entities (the "Farallon General Partners"), as general partner or sole member of the general partner, as the case may be, of each of the Farallon Funds, may be deemed to be a beneficial owner of the Issuer's securities held by the Farallon Funds. The Farallon General Partners disclaim any beneficial ownership of any of the Issuer's securities reported or noted herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (the "'34 Act"), or otherwise, except to the extent of their pecuniary interest, if any.

5. Each of Joshua J. Dapice, Philip D. Dreyfuss, Hannah E. Dunn, Richard B. Fried, Varun N. Gehani, Nicolas Giauque, David T. Kim, Michael G. Linn, Patrick (Cheng) Luo, Rajiv A. Patel, Thomas G. Roberts, Jr., Edric C. Saito, William Seybold, Daniel S. Short, Andrew J. M. Spokes, John R. Warren, and Mark C. Wehrly (collectively, the "Managing Members"), as a managing member or manager, or senior managing member or senior manager, as the case may be, of each of the Farallon General Partners, in each case with the power to exercise investment discretion, may be deemed to be a beneficial owner of the Issuer's securities held by the Farallon Funds. Each of the Managing Members disclaims any beneficial ownership of any of the Issuer's securities reported or noted herein for purposes of Section 16 of the '34 Act or otherwise, except to the extent of his or her pecuniary interest, if any.

6. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $56.14 to $56.55, inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range.

	/s/ Hannah E. Dunn, Managing Member	08/21/2025
	/s/ Hannah E. Dunn, as attorney-in-fact	08/21/2025
	/s/ Hannah E. Dunn, as attorney-in-fact	08/21/2025
	/s/ Hannah E. Dunn	08/21/2025
	/s/ Hannah E. Dunn, as attorney-in-fact	08/21/2025
	/s/ Hannah E. Dunn, as attorney-in-fact	08/21/2025
	/s/ Hannah E. Dunn, as attorney-in-fact	08/21/2025
	/s/ Hannah E. Dunn, as attorney-in-fact	08/21/2025
	/s/ Hannah E. Dunn, as attorney-in-fact	08/21/2025
	/s/ Hannah E. Dunn, as attorney-in-fact	08/21/2025
	** 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 transactions does the Form 4 for LNTH report?

The Form 4 reports sales of 41,000 shares on 08/19/2025 at $55.34 and 3,365,000 shares on 08/20/2025 at a weighted-average $56.15.

How did Farallon's reported ownership of LNTH change after these transactions?

Reported indirect beneficial ownership decreased from 6,842,227 shares to 3,477,227 shares following the transactions.

Who are the reporting persons named on the Form 4?

The Form 4 lists Farallon Partners L.L.C. and multiple affiliated individuals (Managing Members) and notes additional reporting persons filed in parallel.

Are the shares held directly by the reporting persons?

No; the filing states the shares are held directly by Farallon-affiliated investment funds and reported ownership is indirect with managing members disclaiming direct beneficial ownership except for any pecuniary interest.

What price range was disclosed for the 08/20/2025 purchases/sales?

The filing discloses a price range of $56.14 to $56.55 for the transactions comprising the weighted-average price of $56.15.