Portolan Capital Management, LLC

Position in LNTH — Lantheus Holdings, Inc.

CIK 1350290 BOSTON, MA

Back to LNTH Full portfolio

Position in LNTH

as of Jun 30, 2026 · filed Aug 14, 2026 Compact

Position Value

$32,027,379

+$368,348 QoQ

Shares Held

288,691

-30.8% QoQ

Ownership

0.442%

of shares outstanding

% of Portfolio

1.21%

of 13F equity value

Holder Rank

#48

of 462 holders

Holding Since

Mar 2023

14 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Common Shares in LNTH Over Time

Shares Held

Position Value (USD)

Position in Drug Manufacturers - Specialty & Generic

Healthcare · as of Jun 30, 2026

Portolan Capital Management, LLC holds $76,196,276 across 2 Drug Manufacturers - Specialty & Generic names. LNTH ranks #2 (42.0% of the industry book) .

#	Ticker	Company	Shares	Value (USD)	Open
1	UTHR	UNITED THERAPEUTICS Corp	81,518	$44,168,897
2	LNTH	Lantheus Holdings, Inc. This page	288,691	$32,027,379

All Filings in LNTH

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14 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$32,027,379	288,691	-30.8%	Shares	Sole	2026-08-14
2026-03-31	$31,659,031	417,390	-12.3%	Shares	Sole	2026-05-15
2025-12-31	$31,663,757	475,789	+60.1%	Shares	Sole	2026-02-17
2025-09-30	$15,243,798	297,208	+16.8%	Shares	Sole	2025-11-13
2025-06-30	$20,831,487	254,477	-70.7%	Shares	Sole	2025-08-13
2025-03-31	$84,649,358	867,309	+6.7%	Shares	Sole	2025-05-15
2024-12-31	$72,697,879	812,630	+21.1%	Shares	Sole	2025-02-13
2024-09-30	$73,629,189	670,881	+6.1%	Shares	Sole	2024-11-14
2024-06-30	$50,751,710	632,105	+20.2%	Shares	Sole	2024-08-14
2024-03-31	$32,722,182	525,742	+23.1%	Shares	Sole	2024-05-15
2023-12-31	$26,489,128	427,244	-10.0%	Shares	Sole	2024-02-14
2023-09-30	$32,979,307	474,659	+36.9%	Shares	Sole	2023-11-14
2023-06-30	$29,090,784	346,649	+51.9%	Shares	Sole	2023-08-14
2023-03-31	$18,846,549	228,277	—	Shares	Sole	2023-05-15
No filing history on record for this holder in this stock.