Farallon Capital Partners, L.P. - 31 Mar 2025 SCHEDULE 13G/A Report for Lantheus Holdings, Inc. Common Stock, par value $0.01 per share (the "Shares") (CATX)

Filing manager
Farallon Capital Partners, L.P.
Reporting owner
Dapice Joshua J.
Security
Lantheus Holdings, Inc. Common Stock, par value $0.01 per share (the "Shares")
Beneficially owned shares
6,023,227 shares
Ownership signal CIK-linked ownership evidence from parsed SEC filings. 2 signals
Large-stake signal

Form

SCHEDULE 13G/A

Passive or exempt beneficial ownership filing.

Ownership

8.8%

Beneficial ownership of this reported class.

Shares

6,023,227 shares

Shares beneficially owned as disclosed.

Event date

31 Mar 2025

Date tied to the ownership event or amendment.

Accepted by SEC

08 May 2025

EDGAR acceptance date.

How to read this large-stake filing
  • Schedule 13D/G filings focus on beneficial ownership stakes, not a full portfolio.
  • Compare this filing with the holder history and issuer page before treating the percentage as a current position.
  • Use amendments to understand whether the disclosed stake increased, decreased, or changed reporting status.
Class ownership
8.8%
Subject security Names, identifiers, and filing context for this profile. 2 source fields
Symbol
CATX
Shares outstanding
68,445,761 shares
Source evidence Original filing metadata and source links for verification. 6 source fields
SEC form
SCHEDULE 13G/A
Accepted by SEC
08 May 2025, 16:09:31 UTC
Event date
31 Mar 2025
Prior SEC filing
05 Feb 2025
Next SEC filing
12 Nov 2025
Source filing
View source filing

Key filing fact

Farallon Capital Partners, L.P. disclosed 8.8% ownership in Lantheus Holdings, Inc. Common Stock, par value $0.01 per share (the "Shares") (CATX) on 31 Mar 2025.

Key facts

  • Farallon Capital Partners, L.P. filed SCHEDULE 13G/A for Lantheus Holdings, Inc. Common Stock, par value $0.01 per share (the "Shares") (CATX).
  • Disclosed ownership: 8.8%.
  • Date of event: 31 Mar 2025.

Change

  • Previous schedule filing date: 05 Feb 2025.
  • Current filing was accepted on 08 May 2025, 16:09.

Research use

  • This page turns one Schedule 13D/G filing into a quick large-stake read before the raw reporting-person rows.
  • Use the linked SEC filing as the source of truth for ownership percentages, shares, and reporting-party details.

Evidence

Backed by Schedule 13D/13G

Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.

View source filing

Reporting persons

Disclosed reporting parties (30)

Names, ownership percentages, voting power, signatures, titles, and CIKs as disclosed in this Schedule 13D/G filing.

Name Ownership Shares owned Sole voting power Shared voting power Signature Title CIK
Farallon Capital Partners, L.P. 0.7% 465,955 0 465,955 /s/ Hannah E. Dunn Hannah E. Dunn, Managing Member of its General Partner
Farallon Capital Institutional Partners, L.P. 0.8% 539,155 0 539,155 /s/ Hannah E. Dunn Hannah E. Dunn, Managing Member of its General Partner
Farallon Capital Institutional Partners II, L.P. 0.2% 109,654 0 109,654 /s/ Hannah E. Dunn Hannah E. Dunn, Managing Member of its General Partner
Farallon Capital Institutional Partners III, L.P. 0.1% 61,706 0 61,706 /s/ Hannah E. Dunn Hannah E. Dunn, Managing Member of its General Partner
Four Crossings Institutional Partners V, L.P. 0.1% 96,883 0 96,883 /s/ Hannah E. Dunn Hannah E. Dunn, Manager of its General Partner
Farallon Capital Offshore Investors II, L.P. 1.5% 1,057,227 0 1,057,227 /s/ Hannah E. Dunn Hannah E. Dunn, Managing Member of its General Partner
Farallon Capital (AM) Investors, L.P. 0.1% 68,091 0 68,091 /s/ Hannah E. Dunn Hannah E. Dunn, Managing Member of its General Partner
Farallon Capital F5 Master I, L.P. 0.2% 159,273 0 159,273 /s/ Hannah E. Dunn Hannah E. Dunn, Manager of its General Partner
Farallon Healthcare Partners Master, L.P. 5.1% 3,465,283 0 3,465,283 /s/ Hannah E. Dunn Hannah E. Dunn, Manager of its General Partner
Farallon Partners, L.L.C. 8.6% 5,863,954 0 5,863,954 /s/ Hannah E. Dunn Hannah E. Dunn, Managing Member
Farallon Institutional (GP) V, L.L.C. 0.1% 96,883 0 96,883 /s/ Hannah E. Dunn Hannah E. Dunn, Manager
Farallon F5 (GP), L.L.C. 0.2% 159,273 0 159,273 /s/ Hannah E. Dunn Hannah E. Dunn, Manager
Farallon Healthcare Partners (GP), L.L.C. 5.1% 3,465,283 0 3,465,283 /s/ Hannah E. Dunn Hannah E. Dunn, Manager
Dapice Joshua J. 8.8% 6,023,227 0 6,023,227 /s/ Hannah E. Dunn Hannah E. Dunn, as attorney-in-fact
Dreyfuss, Philip D. 8.8% 6,023,227 0 6,023,227 /s/ Hannah E. Dunn Hannah E. Dunn, as attorney-in-fact
Dunn Hannah E. 8.8% 6,023,227 0 6,023,227 /s/ Hannah E. Dunn Hannah E. Dunn
Fried, Richard B 8.8% 6,023,227 0 6,023,227 /s/ Hannah E. Dunn Hannah E. Dunn, as attorney-in-fact
Gehani, Varun N. 8.8% 6,023,227 0 6,023,227 /s/ Hannah E. Dunn Hannah E. Dunn, as attorney-in-fact
Giauque, Nicolas 8.8% 6,023,227 0 6,023,227 /s/ Hannah E. Dunn Hannah E. Dunn, as attorney-in-fact
Kim, David T. 8.8% 6,023,227 0 6,023,227 /s/ Hannah E. Dunn Hannah E. Dunn, as attorney-in-fact
Linn, Michael G. 8.8% 6,023,227 0 6,023,227 /s/ Hannah E. Dunn Hannah E. Dunn, as attorney-in-fact
Luo Patrick (Cheng) 8.8% 6,023,227 0 6,023,227 /s/ Hannah E. Dunn Hannah E. Dunn, as attorney-in-fact
Patel, Rajiv A. 8.8% 6,023,227 0 6,023,227 /s/ Hannah E. Dunn Hannah E. Dunn, as attorney-in-fact
Roberts, Jr., Thomas G. 8.8% 6,023,227 0 6,023,227 /s/ Hannah E. Dunn Hannah E. Dunn, as attorney-in-fact
Saito Edric C. 8.8% 6,023,227 0 6,023,227 /s/ Hannah E. Dunn Hannah E. Dunn, as attorney-in-fact
Seybold, William 8.8% 6,023,227 0 6,023,227 /s/ Hannah E. Dunn Hannah E. Dunn, as attorney-in-fact
Short Daniel S. 8.8% 6,023,227 0 6,023,227 /s/ Hannah E. Dunn Hannah E. Dunn, as attorney-in-fact
Spokes, Andrew J. M. 8.8% 6,023,227 0 6,023,227 /s/ Hannah E. Dunn Hannah E. Dunn, as attorney-in-fact
Warren, John R. 8.8% 6,023,227 0 6,023,227 /s/ Hannah E. Dunn Hannah E. Dunn, as attorney-in-fact
Wehrly, Mark C. 8.8% 6,023,227 0 6,023,227 /s/ Hannah E. Dunn Hannah E. Dunn, as attorney-in-fact
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