DOSSIER · 13F Holders · Q1 2026BellwetherCompounder

LNTH 2.625 12/15/27

LANTHEUS HLDGS INC

73 institutions still hold LANTHEUS HLDGS INC as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 516544AB9·73 13F holders·last filed Mar 31, 2026

Market cap

—

▼ 4.6%

vs prior quarter

13F value held

$579M

46.0% inst. owned

of float

Holders

73

-77 QoQ

filers reporting

Activity

+89 / −52

+737 added · −726 reduced

this quarter

Concentration

10.57%

MACKAY SHIELDS LLC #1

top holder share

AI Holders Summary · Q1 2026

73 institutions reported LNTH 2.625 12/15/27 in Q1 2026. MACKAY SHIELDS LLC leads at 10.6% of the visible book. -77 net institutions QoQ — distribution reading.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter

MACKAY SHIELDS LLC

$61M50.9M2.24%Q1 2026 02

WOLVERINE ASSET MANAGEMENT LLC

$56M46.4M0.54%Q1 2026 03

TENOR CAPITAL MANAGEMENT Co., L.P.

$52M43.0M0.80%Q1 2026 04

ADVENT CAPITAL MANAGEMENT /DE/

$48M39.9M1.33%Q1 2026 05

CAMDEN ASSET MANAGEMENT L P /CA

$45M37.9M1.55%Q1 2026 06

BRIGADE CAPITAL MANAGEMENT, LP

$43M37.2M12.85%Q4 2025 07

DeepCurrents Investment Group LLC

$37M30.5M1.19%Q1 2026 08

$36M30.2M0.19%Q1 2026 09

READYSTATE ASSET MANAGEMENT LP

$34M29.5M1.37%Q4 2025 10

DEERFIELD MANAGEMENT COMPANY, L.P.

$29M25.3M0.37%Q4 2025 11

WELLINGTON MANAGEMENT GROUP LLP

$19M15.4M0.00%Q1 2026 12

Calamos Advisors LLC

$18M15.0M0.06%Q1 2026 13

Wellesley Asset Management

$17M14.4M1.82%Q1 2026 14

BANK OF AMERICA CORP /DE/

$16M13.3M0.00%Q1 2026 15

STATE STREET CORP

$15M12.2M0.00%Q1 2026 16

ABSOLUTE INVESTMENT ADVISERS, LLC

$13M10.6M1.49%Q1 2026 17

AMERIPRISE FINANCIAL INC

$12M10.0M0.00%Q1 2026 18

BlackRock, Inc.

$11M9.1M0.00%Q1 2026 19

$9M7.6M0.00%Q1 2026 20

Lombard Odier Asset Management (Europe) Ltd

$9M7.2M0.47%Q1 2026

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