Lantheus Holdings, Inc. - Common Stock, par value $0.01 per share (the "Shares") (CATX)

Q: What does CUSIP 46489V104 represent in this 13F holders report?

CUSIP 46489V104 is the security identifier for CATX - Lantheus Holdings, Inc. - Common Stock, par value $0.01 per share (the "Shares") used to aggregate holder disclosures.

Q: How many institutions held CATX - Lantheus Holdings, Inc. - Common Stock, par value $0.01 per share (the "Shares") in Q1 2026?

2 institutional investors reported CATX - Lantheus Holdings, Inc. - Common Stock, par value $0.01 per share (the "Shares") for Q1 2026. Use the holders table for investor-level position and value details.

CUSIP: 46489V104

Q1 2026 13F Holders as of 31 Mar 2026

Security type / class: Equity / Common Stock, par value $0.01 per share (the "Shares")
Total 13F shares: 1,348,691
Total 13F value: $5,624,500
Share change: +1,098,189
SEC-reported price per share: $4.17
Number of holders: 2
Value change: +$4,579,906
Number of buys: 1
Shares outstanding: 66,188,768

Security key

46489V104

Report period

Q1 2026

Institutions

Top holders

CATX full security history Ownership snapshot Full 13F holder table Newer quarter: Q2 2026 Previous quarter: Q4 2025 Lantheus Holdings, Inc. SEC filings Lantheus Holdings, Inc. company facts

Broader feeds

Latest 13F filings Latest 13D/G filings Investors directory

Reporting periods

Holder history for CUSIP 46489V104

Newer quarter: Q2 2026 Previous quarter: Q4 2025

Recent filing periods:

Q2 2026 Q1 2026 Q4 2025 Q3 2025

Ownership snapshot

Top reported holders of CATX - Lantheus Holdings, Inc. - Common Stock, par value $0.01 per share (the "Shares") (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.

Comparable stake leader

Farallon Capital Partners...

Disclosed value leader

BlackRock, Inc.

Comparable rows

15/15

Latest evidence

31 Mar 2026

13D/G 13F 3/4/5 Lead comparable stake: 8.2% 13D/G row: Farallon Capital Partners, L.P. Showing 1-6 of 15 holder rows.

Quick read

Farallon Capital Partners, L.P. leads the comparable SEC ownership view at 8.2%.

15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.

Open SEC evidence Opens Farallon Capital Partners, L.P.'s linked filing trail.

Comparable ownership Top 5

Farallon Capital Partners, L.P. 8.2%

Janus Henderson Group Ltd. 7.4%

FMR LLC 6.5%

VANGUARD CAPITAL MANAGEMENT LLC 5.2%

MORGAN STANLEY 2.5%

Ownership % is shown only when SEC disclosures are safely comparable across share classes.

Detailed SEC evidence table Showing 1-6 of 15 holder rows

Holder	Evidence	Ownership %	Position	12M Net Δ	As of
Farallon Capital Partners, L.P.	13D/G Dapice Joshua J. 13D/G	8.2%	— 5,427,479 shares	+$6,689,559	31 Dec 2025
Janus Henderson Group Ltd.	13D/G 13F JANUS HENDERSON GROUP PLC · Company 13D/G 13F	7.4%	$384,804,436 4,774,841 shares	-$75,142,600	31 Mar 2026
FMR LLC	13F 13D/G Company 13F 13D/G	6.5% from 13D/G	$287,730,636 4,323,526 shares	—	31 Dec 2025
VANGUARD CAPITAL MANAGEMENT LLC	13D/G Vanguard Capital Management 13D/G	5.2%	$259,514,252 3,421,414 shares	$0	31 Mar 2026
MORGAN STANLEY	13F 13D/G Company 13F 13D/G	2.5% from 13D/G	$116,966,337 1,757,569 shares	—	31 Dec 2025
FARALLON PARTNERS L L C/CA	3/4/5 Member of a Group Owning 10%, 10%+ Owner 3/4/5	5.3%	$195,246,296 3,477,227 shares	-$191,213,690	19 Aug 2025

How to read this table

Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

13F holder rows

Institutional holders as of Q1 2026

Investor-level positions for this CUSIP, loaded as an interactive table.

Institutions

1,348,691

Rows available

Investor	Option	Weight %	Change %	SEC-reported value	* Price	Shares	Share Change	Activity	Report Period

^* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.

Compare Q1 2026 vs Q4 2025 Across Filers

Q4 2025 holders

Q1 2026 holders

Holder diff

Investor	Q4 2025 Shares	Q1 2026 Shares	Share Diff	Share Chg %	Q4 2025 value	Q1 2026 value	Value change	Value Chg %

Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).

Quarterly Holders Trend

Quarterly Value Trend

Quarterly Shares Trend