# EDGAR Filing Document

**Accession Number:** 0001904298
**File Stem:** 0000908834-25-000258
**Filing Date:** 2025-8
**Character Count:** 34347
**Document Hash:** c3375b3f53ef02430fea991f57605eb7
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000908834-25-000258.hdr.sgml**: 20250818

**ACCESSION NUMBER**: 0000908834-25-000258

**CONFORMED SUBMISSION TYPE**: 3

**PUBLIC DOCUMENT COUNT**: 2

**CONFORMED PERIOD OF REPORT**: 20250806

**FILED AS OF DATE**: 20250818

**DATE AS OF CHANGE**: 20250818

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** FARALLON PARTNERS L L C/CA
- **CENTRAL INDEX KEY:** 0001040153

**ORGANIZATION NAME:**
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-36569
- **FILM NUMBER:** 251227887

**BUSINESS ADDRESS:**
- **STREET 1:** ONE MARITIME PLAZA
- **STREET 2:** SUITE 2100
- **CITY:** SAN FRANCISCO
- **STATE:** CA
- **ZIP:** 94111
- **BUSINESS PHONE:** (415)421-2132

**MAIL ADDRESS:**
- **STREET 1:** ONE MARITIME PLAZA
- **STREET 2:** SUITE 2100
- **CITY:** SAN FRANCISCO
- **STATE:** CA
- **ZIP:** 94111
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** FRIED RICHARD B
- **CENTRAL INDEX KEY:** 0001245637

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-36569
- **FILM NUMBER:** 251227883

**MAIL ADDRESS:**
- **STREET 1:** C/O FARALLON CAPITAL MANAGEMENT, L.L.C.
- **STREET 2:** ONE MARITIME PLAZA, SUITE  2100
- **CITY:** SAN FRANCISCO
- **STATE:** CA
- **ZIP:** 94111
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Giauque Nicolas
- **CENTRAL INDEX KEY:** 0001372970

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-36569
- **FILM NUMBER:** 251227881

**MAIL ADDRESS:**
- **STREET 1:** C/O NOONDAY ASSET MANAGEMENT, LLP
- **STREET 2:** BURDETT HOUSE, 15-16, BUCKINGHAM STREET
- **CITY:** LONDON
- **STATE:** X0
- **ZIP:** WC2N 6DU
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Linn Michael G
- **CENTRAL INDEX KEY:** 0001495856

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-36569
- **FILM NUMBER:** 251227879

**MAIL ADDRESS:**
- **STREET 1:** C/O FARALLON CAPITAL MANAGEMENT, L.L.C.
- **STREET 2:** ONE MARITIME PLAZA, SUITE 2100
- **CITY:** SAN FRANCISCO
- **STATE:** CA
- **ZIP:** 94111
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Kim David T
- **CENTRAL INDEX KEY:** 0001595643

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-36569
- **FILM NUMBER:** 251227880

**MAIL ADDRESS:**
- **STREET 1:** C/O FARALLON CAPITAL MANAGEMENT, L.L.C.
- **STREET 2:** ONE MARITIME PLAZA, SUITE 2100
- **CITY:** SAN FRANCISCO
- **STATE:** CA
- **ZIP:** 94111
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Luo Patrick (Cheng)
- **CENTRAL INDEX KEY:** 0002054041

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-36569
- **FILM NUMBER:** 251227878

**MAIL ADDRESS:**
- **STREET 1:** ONE MARITIME PLAZA, SUITE 2100
- **CITY:** SAN FRANCISCO
- **STATE:** CA
- **ZIP:** 94111
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Dreyfuss Philip D
- **CENTRAL INDEX KEY:** 0001693981

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-36569
- **FILM NUMBER:** 251227885

**MAIL ADDRESS:**
- **STREET 1:** C/O FARALLON CAPITAL MANAGEMENT, L.L.C.
- **STREET 2:** ONE MARITIME PLAZA, SUITE 2100
- **CITY:** SAN FRANCISCO
- **STATE:** CA
- **ZIP:** 94111
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Gehani Varun N
- **CENTRAL INDEX KEY:** 0001904298

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-36569
- **FILM NUMBER:** 251227882

**MAIL ADDRESS:**
- **STREET 1:** ONE MARITIME PLAZA, SUITE 2100
- **CITY:** SAN FRANCISCO
- **STATE:** CA
- **ZIP:** 94111
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Dapice Joshua J.
- **CENTRAL INDEX KEY:** 0001960821

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-36569
- **FILM NUMBER:** 251227886

**MAIL ADDRESS:**
- **STREET 1:** ONE MARITIME PLAZA SUITE 2100
- **CITY:** SAN FRANCISCO
- **STATE:** CA
- **ZIP:** 94111
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Dunn Hannah E.
- **CENTRAL INDEX KEY:** 0001960890

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-36569
- **FILM NUMBER:** 251227884

**MAIL ADDRESS:**
- **STREET 1:** ONE MARITIME PLAZA SUITE 2100
- **CITY:** SAN FRANCISCO
- **STATE:** CA
- **ZIP:** 94111
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Lantheus Holdings, Inc.
- **CENTRAL INDEX KEY:** 0001521036
- **STANDARD INDUSTRIAL CLASSIFICATION:** IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES [2835]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 352318913
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 331 TREBLE COVE ROAD
- **CITY:** NORTH BILLERICA
- **STATE:** MA
- **ZIP:** 01862
- **BUSINESS PHONE:** 978 671-8001

**MAIL ADDRESS:**
- **STREET 1:** 331 TREBLE COVE ROAD
- **CITY:** NORTH BILLERICA
- **STATE:** MA
- **ZIP:** 01862

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Lantheus MI Holdings, Inc.
- **DATE OF NAME CHANGE:** 20110517

## Ex-24

POWER OF ATTORNEY

The undersigned hereby appoints each of Hannah E. Dunn, Philip D. Dreyfuss, David T. Kim, Thomas G. Roberts, Jr., John R. Warren, and Mark C. Wehrly his or her true and lawful attorney-in-fact and agent to execute and file with the Securities and Exchange Commission any Form 3, Form 4 or Form 5, any amendments thereto or any related documentation (together the "Filing Documentation") which may be required to be filed in his or her individual capacity as a result of the undersigned's position as managing member of Farallon Capital Management, L.L.C. and/or Farallon Partners, L.L.C., and granting unto each said attorney-in-fact and agent full power and authority to do and perform each and every act and thing which he might or could do in person, hereby ratifying and confirming all that each said attorney-in-fact and agent may lawfully do or cause to be done by virtue hereof. The authority of each of Hannah E. Dunn, Philip D. Dreyfuss, David T. Kim, Thomas G. Roberts, Jr., John R. Warren, and Mark C. Wehrly under this Power of Attorney shall continue with respect to the undersigned until the undersigned is no longer required to file the Filing Documentation unless revoked earlier in writing. The undersigned hereby revokes any and all prior Powers of Attorney executed by the undersigned in his or her capacity as a managing member of Farallon Capital Management, L.L.C. and/or Farallon Partners, L.L.C. with respect to the execution and filing of Filing Documentation.

Date: December 26, 2024 <u>/s/ Joshua J. Dapice</u>

POWER OF ATTORNEY

The undersigned hereby appoints each of Hannah E. Dunn, Philip D. Dreyfuss, David T. Kim, Thomas G. Roberts, Jr., John R. Warren, and Mark C. Wehrly his or her true and lawful attorney-in-fact and agent to execute and file with the Securities and Exchange Commission any Form 3, Form 4 or Form 5, any amendments thereto or any related documentation (together the "Filing Documentation") which may be required to be filed in his or her individual capacity as a result of the undersigned's position as managing member of Farallon Capital Management, L.L.C. and/or Farallon Partners, L.L.C., and granting unto each said attorney-in-fact and agent full power and authority to do and perform each and every act and thing which he might or could do in person, hereby ratifying and confirming all that each said attorney-in-fact and agent may lawfully do or cause to be done by virtue hereof. The authority of each of Hannah E. Dunn, Philip D. Dreyfuss, David T. Kim, Thomas G. Roberts, Jr., John R. Warren, and Mark C. Wehrly under this Power of Attorney shall continue with respect to the undersigned until the undersigned is no longer required to file the Filing Documentation unless revoked earlier in writing. The undersigned hereby revokes any and all prior Powers of Attorney executed by the undersigned in his or her capacity as a managing member of Farallon Capital Management, L.L.C. and/or Farallon Partners, L.L.C. with respect to the execution and filing of Filing Documentation.

Date: December 26, 2024 <u>/s/ Philip D. Dreyfuss</u>

POWER OF ATTORNEY

The undersigned hereby appoints each of Hannah E. Dunn, Philip D. Dreyfuss, David T. Kim, Thomas G. Roberts, Jr., John R. Warren, and Mark C. Wehrly his or her true and lawful attorney-in-fact and agent to execute and file with the Securities and Exchange Commission any Form 3, Form 4 or Form 5, any amendments thereto or any related documentation (together the "Filing Documentation") which may be required to be filed in his or her individual capacity as a result of the undersigned's position as managing member of Farallon Capital Management, L.L.C. and/or Farallon Partners, L.L.C., and granting unto each said attorney-in-fact and agent full power and authority to do and perform each and every act and thing which he might or could do in person, hereby ratifying and confirming all that each said attorney-in-fact and agent may lawfully do or cause to be done by virtue hereof. The authority of each of Hannah E. Dunn, Philip D. Dreyfuss, David T. Kim, Thomas G. Roberts, Jr., John R. Warren, and Mark C. Wehrly under this Power of Attorney shall continue with respect to the undersigned until the undersigned is no longer required to file the Filing Documentation unless revoked earlier in writing. The undersigned hereby revokes any and all prior Powers of Attorney executed by the undersigned in his or her capacity as a managing member of Farallon Capital Management, L.L.C. and/or Farallon Partners, L.L.C. with respect to the execution and filing of Filing Documentation.

Date: December 26, 2024 <u>/s/ Hannah E. Dunn</u>

POWER OF ATTORNEY

The undersigned hereby appoints each of Hannah E. Dunn, Philip D. Dreyfuss, David T. Kim, Thomas G. Roberts, Jr., John R. Warren, and Mark C. Wehrly his or her true and lawful attorney-in-fact and agent to execute and file with the Securities and Exchange Commission any Form 3, Form 4 or Form 5, any amendments thereto or any related documentation (together the "Filing Documentation") which may be required to be filed in his or her individual capacity as a result of the undersigned's position as managing member of Farallon Capital Management, L.L.C. and/or Farallon Partners, L.L.C., and granting unto each said attorney-in-fact and agent full power and authority to do and perform each and every act and thing which he might or could do in person, hereby ratifying and confirming all that each said attorney-in-fact and agent may lawfully do or cause to be done by virtue hereof. The authority of each of Hannah E. Dunn, Philip D. Dreyfuss, David T. Kim, Thomas G. Roberts, Jr., John R. Warren, and Mark C. Wehrly under this Power of Attorney shall continue with respect to the undersigned until the undersigned is no longer required to file the Filing Documentation unless revoked earlier in writing. The undersigned hereby revokes any and all prior Powers of Attorney executed by the undersigned in his or her capacity as a managing member of Farallon Capital Management, L.L.C. and/or Farallon Partners, L.L.C. with respect to the execution and filing of Filing Documentation.

Date: December 26, 2024 <u>/s/ Richard B. Fried</u>

POWER OF ATTORNEY

The undersigned hereby appoints each of Hannah E. Dunn, Philip D. Dreyfuss, David T. Kim, Thomas G. Roberts, Jr., John R. Warren, and Mark C. Wehrly his or her true and lawful attorney-in-fact and agent to execute and file with the Securities and Exchange Commission any Form 3, Form 4 or Form 5, any amendments thereto or any related documentation (together the "Filing Documentation") which may be required to be filed in his or her individual capacity as a result of the undersigned's position as managing member of Farallon Capital Management, L.L.C. and/or Farallon Partners, L.L.C., and granting unto each said attorney-in-fact and agent full power and authority to do and perform each and every act and thing which he might or could do in person, hereby ratifying and confirming all that each said attorney-in-fact and agent may lawfully do or cause to be done by virtue hereof. The authority of each of Hannah E. Dunn, Philip D. Dreyfuss, David T. Kim, Thomas G. Roberts, Jr., John R. Warren, and Mark C. Wehrly under this Power of Attorney shall continue with respect to the undersigned until the undersigned is no longer required to file the Filing Documentation unless revoked earlier in writing. The undersigned hereby revokes any and all prior Powers of Attorney executed by the undersigned in his or her capacity as a managing member of Farallon Capital Management, L.L.C. and/or Farallon Partners, L.L.C. with respect to the execution and filing of Filing Documentation.

Date: December 26, 2024 <u>/s/ Varun N. Gehani</u>

POWER OF ATTORNEY

The undersigned hereby appoints each of Hannah E. Dunn, Philip D. Dreyfuss, David T. Kim, Thomas G. Roberts, Jr., John R. Warren, and Mark C. Wehrly his or her true and lawful attorney-in-fact and agent to execute and file with the Securities and Exchange Commission any Form 3, Form 4 or Form 5, any amendments thereto or any related documentation (together the "Filing Documentation") which may be required to be filed in his or her individual capacity as a result of the undersigned's position as managing member of Farallon Capital Management, L.L.C. and/or Farallon Partners, L.L.C., and granting unto each said attorney-in-fact and agent full power and authority to do and perform each and every act and thing which he might or could do in person, hereby ratifying and confirming all that each said attorney-in-fact and agent may lawfully do or cause to be done by virtue hereof. The authority of each of Hannah E. Dunn, Philip D. Dreyfuss, David T. Kim, Thomas G. Roberts, Jr., John R. Warren, and Mark C. Wehrly under this Power of Attorney shall continue with respect to the undersigned until the undersigned is no longer required to file the Filing Documentation unless revoked earlier in writing. The undersigned hereby revokes any and all prior Powers of Attorney executed by the undersigned in his or her capacity as a managing member of Farallon Capital Management, L.L.C. and/or Farallon Partners, L.L.C. with respect to the execution and filing of Filing Documentation.

Date: December 26, 2024 <u>/s/ Nicolas Giauque</u>

POWER OF ATTORNEY

The undersigned hereby appoints each of Hannah E. Dunn, Philip D. Dreyfuss, David T. Kim, Thomas G. Roberts, Jr., John R. Warren, and Mark C. Wehrly his or her true and lawful attorney-in-fact and agent to execute and file with the Securities and Exchange Commission any Form 3, Form 4 or Form 5, any amendments thereto or any related documentation (together the "Filing Documentation") which may be required to be filed in his or her individual capacity as a result of the undersigned's position as managing member of Farallon Capital Management, L.L.C. and/or Farallon Partners, L.L.C., and granting unto each said attorney-in-fact and agent full power and authority to do and perform each and every act and thing which he might or could do in person, hereby ratifying and confirming all that each said attorney-in-fact and agent may lawfully do or cause to be done by virtue hereof. The authority of each of Hannah E. Dunn, Philip D. Dreyfuss, David T. Kim, Thomas G. Roberts, Jr., John R. Warren, and Mark C. Wehrly under this Power of Attorney shall continue with respect to the undersigned until the undersigned is no longer required to file the Filing Documentation unless revoked earlier in writing. The undersigned hereby revokes any and all prior Powers of Attorney executed by the undersigned in his or her capacity as a managing member of Farallon Capital Management, L.L.C. and/or Farallon Partners, L.L.C. with respect to the execution and filing of Filing Documentation.

Date: December 26, 2024 <u>/s/ David T. Kim</u>

POWER OF ATTORNEY

The undersigned hereby appoints each of Hannah E. Dunn, Philip D. Dreyfuss, David T. Kim, Thomas G. Roberts, Jr., John R. Warren, and Mark C. Wehrly his or her true and lawful attorney-in-fact and agent to execute and file with the Securities and Exchange Commission any Form 3, Form 4 or Form 5, any amendments thereto or any related documentation (together the "Filing Documentation") which may be required to be filed in his or her individual capacity as a result of the undersigned's position as managing member of Farallon Capital Management, L.L.C. and/or Farallon Partners, L.L.C., and granting unto each said attorney-in-fact and agent full power and authority to do and perform each and every act and thing which he might or could do in person, hereby ratifying and confirming all that each said attorney-in-fact and agent may lawfully do or cause to be done by virtue hereof. The authority of each of Hannah E. Dunn, Philip D. Dreyfuss, David T. Kim, Thomas G. Roberts, Jr., John R. Warren, and Mark C. Wehrly under this Power of Attorney shall continue with respect to the undersigned until the undersigned is no longer required to file the Filing Documentation unless revoked earlier in writing. The undersigned hereby revokes any and all prior Powers of Attorney executed by the undersigned in his or her capacity as a managing member of Farallon Capital Management, L.L.C. and/or Farallon Partners, L.L.C. with respect to the execution and filing of Filing Documentation.

Date: December 26, 2024 <u>/s/ Michael G. Linn</u>

POWER OF ATTORNEY

The undersigned hereby appoints each of Hannah E. Dunn, Philip D. Dreyfuss, David T. Kim, Thomas G. Roberts, Jr., John R. Warren, and Mark C. Wehrly his or her true and lawful attorney-in-fact and agent to execute and file with the Securities and Exchange Commission any Form 3, Form 4 or Form 5, any amendments thereto or any related documentation (together the "Filing Documentation") which may be required to be filed in his or her individual capacity as a result of the undersigned's position as managing member of Farallon Capital Management, L.L.C. and/or Farallon Partners, L.L.C., and granting unto each said attorney-in-fact and agent full power and authority to do and perform each and every act and thing which he might or could do in person, hereby ratifying and confirming all that each said attorney-in-fact and agent may lawfully do or cause to be done by virtue hereof. The authority of each of Hannah E. Dunn, Philip D. Dreyfuss, David T. Kim, Thomas G. Roberts, Jr., John R. Warren, and Mark C. Wehrly under this Power of Attorney shall continue with respect to the undersigned until the undersigned is no longer required to file the Filing Documentation unless revoked earlier in writing. The undersigned hereby revokes any and all prior Powers of Attorney executed by the undersigned in his or her capacity as a managing member of Farallon Capital Management, L.L.C. and/or Farallon Partners, L.L.C. with respect to the execution and filing of Filing Documentation.

Date: December 26, 2024 <u>/s/ Patrick (Cheng) Luo</u>

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

## FORM 3

### INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>FARALLON PARTNERS L L C/CA<br><sub>(Last) (First) (Middle)</sub><br>ONE MARITIME PLAZA, SUITE 2100<br><sub>(Street)</sub><br>SAN FRANCISCO, CA 94111<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>Lantheus Holdings, Inc. [ LNTH ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2025-08-06 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director   [X] 10% Owner<br>[ ] Officer (give title below)   [X] Other (specify below)<br>_ _ | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Dapice Joshua J.<br><sub>(Last) (First) (Middle)</sub><br>C/O FARALLON CAPITAL MANAGEMENT, L.L.C.<br>ONE MARITIME PLAZA, SUITE 2100<br><sub>(Street)</sub><br>SAN FRANCISCO, CA 94111<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>Lantheus Holdings, Inc. [ LNTH ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2025-08-06 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director   [ ] 10% Owner<br>[ ] Officer (give title below)   [X] Other (specify below)<br>_ _ | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Dreyfuss Philip D<br><sub>(Last) (First) (Middle)</sub><br>C/O FARALLON CAPITAL MANAGEMENT, L.L.C.<br>ONE MARITIME PLAZA, SUITE 2100<br><sub>(Street)</sub><br>SAN FRANCISCO, CA 94111<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>Lantheus Holdings, Inc. [ LNTH ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2025-08-06 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director   [ ] 10% Owner<br>[ ] Officer (give title below)   [X] Other (specify below)<br>_ _ | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Dunn Hannah E.<br><sub>(Last) (First) (Middle)</sub><br>C/O FARALLON CAPITAL MANAGEMENT, L.L.C.<br>ONE MARITIME PLAZA, SUITE 2100<br><sub>(Street)</sub><br>SAN FRANCISCO, CA 94111<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>Lantheus Holdings, Inc. [ LNTH ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2025-08-06 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director   [ ] 10% Owner<br>[ ] Officer (give title below)   [X] Other (specify below)<br>_ _ | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>FRIED RICHARD B<br><sub>(Last) (First) (Middle)</sub><br>C/O FARALLON CAPITAL MANAGEMENT, L.L.C.<br>ONE MARITIME PLAZA, SUITE 2100<br><sub>(Street)</sub><br>SAN FRANCISCO, CA 94111<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>Lantheus Holdings, Inc. [ LNTH ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2025-08-06 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director   [ ] 10% Owner<br>[ ] Officer (give title below)   [X] Other (specify below)<br>_ _ | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Gehani Varun N<br><sub>(Last) (First) (Middle)</sub><br>C/O FARALLON CAPITAL MANAGEMENT, L.L.C.<br>ONE MARITIME PLAZA, SUITE 2100<br><sub>(Street)</sub><br>SAN FRANCISCO, CA 94111<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>Lantheus Holdings, Inc. [ LNTH ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2025-08-06 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director   [ ] 10% Owner<br>[ ] Officer (give title below)   [X] Other (specify below)<br>_ _ | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Giauque Nicolas<br><sub>(Last) (First) (Middle)</sub><br>C/O FARALLON CAPITAL MANAGEMENT, L.L.C.<br>ONE MARITIME PLAZA, SUITE 2100<br><sub>(Street)</sub><br>SAN FRANCISCO, CA 94111<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>Lantheus Holdings, Inc. [ LNTH ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2025-08-06 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director   [ ] 10% Owner<br>[ ] Officer (give title below)   [X] Other (specify below)<br>_ _ | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Kim David T<br><sub>(Last) (First) (Middle)</sub><br>C/O FARALLON CAPITAL MANAGEMENT, L.L.C.<br>ONE MARITIME PLAZA, SUITE 2100<br><sub>(Street)</sub><br>SAN FRANCISCO, CA 94111<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>Lantheus Holdings, Inc. [ LNTH ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2025-08-06 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director   [ ] 10% Owner<br>[ ] Officer (give title below)   [X] Other (specify below)<br>_ _ | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Linn Michael G<br><sub>(Last) (First) (Middle)</sub><br>C/O FARALLON CAPITAL MANAGEMENT, L.L.C.<br>ONE MARITIME PLAZA, SUITE 2100<br><sub>(Street)</sub><br>SAN FRANCISCO, CA 94111<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>Lantheus Holdings, Inc. [ LNTH ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2025-08-06 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director   [ ] 10% Owner<br>[ ] Officer (give title below)   [X] Other (specify below)<br>_ _ | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

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| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Luo Patrick (Cheng)<br><sub>(Last) (First) (Middle)</sub><br>C/O FARALLON CAPITAL MANAGEMENT, L.L.C.<br>ONE MARITIME PLAZA, SUITE 2100<br><sub>(Street)</sub><br>SAN FRANCISCO, CA 94111<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>Lantheus Holdings, Inc. [ LNTH ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2025-08-06 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director   [ ] 10% Owner<br>[ ] Officer (give title below)   [X] Other (specify below)<br>_ _ | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

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## Table I - Non-Derivative Securities Beneficially Owned

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|  |  |  |  |
| --- | --- | --- | --- |
| 1. Title of Security | 2. Amount of Securities Beneficially Owned | 3. Ownership Form | 4. Nature of Indirect Beneficial Ownership |
| Common Stock | 6883227 | I | See Footnotes<sup>(1)(2)(3)(4)(5)</sup> |

---

## Table II - Derivative Securities Beneficially Owned

---

|  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Date Exercisable and Expiration Date (Month/Day/Year) | 2. Date Exercisable and Expiration Date (Month/Day/Year) | 3. Title and Amount of Underlying Securities | 3. Title and Amount of Underlying Securities | 4. Conversion or Exercise Price | 5. Ownership Form | 6. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 4. Conversion or Exercise Price | 5. Ownership Form | 6. Nature of Indirect Beneficial Ownership |
|  |  |  |  |  |  |  |  |

---

### Footnotes:

(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

**Signature:** /s/ Hannah E. Dunn, Managing Member  
**Date:** 2025-08-18

**Signature:** /s/ Hannah E. Dunn, as attorney-in-fact  
**Date:** 2025-08-18

**Signature:** /s/ Hannah E. Dunn, as attorney-in-fact  
**Date:** 2025-08-18

**Signature:** /s/ Hannah E. Dunn  
**Date:** 2025-08-18

**Signature:** /s/ Hannah E. Dunn, as attorney-in-fact  
**Date:** 2025-08-18

**Signature:** /s/ Hannah E. Dunn, as attorney-in-fact  
**Date:** 2025-08-18

**Signature:** /s/ Hannah E. Dunn, as attorney-in-fact  
**Date:** 2025-08-18

**Signature:** /s/ Hannah E. Dunn, as attorney-in-fact  
**Date:** 2025-08-18

**Signature:** /s/ Hannah E. Dunn, as attorney-in-fact  
**Date:** 2025-08-18

**Signature:** /s/ Hannah E. Dunn, as attorney-in-fact  
**Date:** 2025-08-18

### Remarks:

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.**