[Form 3] Lantheus Holdings, Inc Initial Statement of Beneficial Ownership

Rhea-AI Filing Summary

Farallon Partners and affiliated managing members filed a Form 3 disclosing beneficial ownership of 6,883,227 shares of Lantheus Holdings, Inc. (ticker: LNTH). The filing, triggered by an event dated 08/06/2025, states that as of 08/01/2025 there were 67,994,149 shares outstanding and that, solely because the issuer reduced its outstanding share count, the Farallon Funds now hold in excess of 10.0% of common stock. The Form 3 emphasizes that this report does not reflect any acquisition by the reporting persons and that ownership is held indirectly by Farallon-managed funds with various managing members disclaiming direct beneficial ownership except to the extent of any pecuniary interest.

Positive

• Compliance disclosure: The filing provides clear Section 16 disclosure with footnotes explaining fund and manager relationships.
• No acquisition: The reporting persons explicitly state that the >10% position resulted from a reduction in outstanding shares, not new purchases.

Negative

• Concentration: The Farallon Funds now hold >10.0% of LNTH, representing meaningful ownership concentration.
• Indirect ownership complexity: Multiple entities and managers are involved, which can complicate voting and engagement clarity.

Insights

Securities Analyst

TL;DR: Passive increase above 10% caused by share count reduction; no purchases reported.

The Form 3 documents an indirect holding of 6,883,227 shares by Farallon-affiliated funds, crossing the 10% threshold after the issuer reduced shares outstanding to 67,994,149. The filing clarifies no acquisition occurred and attributes beneficial ownership to Farallon Funds and their general partners, with managing members disclaiming direct ownership except for pecuniary interest. This is a routine Section 16 disclosure reflecting ownership concentration due to capital structure change rather than trading activity.

Corporate Governance Expert

TL;DR: Disclosure aligns with Section 16 norms; multiple managing members listed for clarity and compliance.

The Form 3 lists Farallon Partners L.L.C. as reporting and names numerous managing members and affiliated entities. Footnotes explain the relationship among funds, general partners, and managing members and include customary disclaimers of direct beneficial ownership. The inclusion of an exhibit (Powers of Attorney) and multiple signed attorney-in-fact entries indicates attention to procedural compliance in initial ownership reporting.

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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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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. Date of Event Requiring Statement (Month/Day/Year)
08/06/2025

3. Issuer Name and Ticker or Trading Symbol
Lantheus Holdings, Inc. [ LNTH ]

4. 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%

5. 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 Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	6,883,227	I	See Footnotes(1)(2)(3)(4)(5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	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 3 may be deemed members of a group holding equity securities of Lantheus Holdings, Inc. (the "Issuer"). The filing of this Form 3 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 3 is limited, the entities and individuals listed in these footnotes that are not reporting persons on this Form 3 are filing an additional Form 3 on the date hereof as reporting persons with respect to the securities described herein (the "Parallel Form 3"). Information regarding these entities and individuals is included in this Form 3 for purposes of clarification and convenience only, and is duplicative of the information reported in the Parallel Form 3.

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.

Remarks:

On a Form 10-Q filed by the Issuer on August 6, 2025, the Issuer disclosed that, as of August 1, 2025, the Issuer had 67,994,149 shares of common stock outstanding. The reporting persons are filing this Form 3 to reflect the fact that, due solely to the reduction in the number of shares of common stock outstanding reflected in such Form 10-Q, the Farallon Funds hold greater than 10.0% of the common stock outstanding. This Form 3 does not reflect any acquisition of common stock by any reporting person. Exhibit List: Exhibit 24 - Powers of Attorney

	/s/ Hannah E. Dunn, Managing Member	08/18/2025
	/s/ Hannah E. Dunn, as attorney-in-fact	08/18/2025
	/s/ Hannah E. Dunn, as attorney-in-fact	08/18/2025
	/s/ Hannah E. Dunn	08/18/2025
	/s/ Hannah E. Dunn, as attorney-in-fact	08/18/2025
	/s/ Hannah E. Dunn, as attorney-in-fact	08/18/2025
	/s/ Hannah E. Dunn, as attorney-in-fact	08/18/2025
	/s/ Hannah E. Dunn, as attorney-in-fact	08/18/2025
	/s/ Hannah E. Dunn, as attorney-in-fact	08/18/2025
	/s/ Hannah E. Dunn, as attorney-in-fact	08/18/2025
	** 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 5 (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).
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FAQ

What stake did Farallon report in Lantheus Holdings (LNTH)?

The Farallon Funds reported beneficial ownership of 6,883,227 shares of LNTH.

Why did Farallon cross the 10% threshold in this Form 3 filing?

The filing states the Farallon Funds hold >10.0% solely due to a reduction in the issuer's outstanding shares (67,994,149 shares outstanding as of 08/01/2025).

Did the reporting persons buy shares to trigger this filing?

No. The Form 3 explicitly states this Form 3 does not reflect any acquisition of common stock by any reporting person.

When was the event requiring this statement dated?

The Date of Event Requiring Statement is 08/06/2025 and the outstanding share count is reported as of 08/01/2025.

Who signed the Form 3 for the reporting persons?

The signature block shows multiple entries signed by Hannah E. Dunn as Managing Member and as attorney-in-fact dated 08/18/2025.