Lantheus
LNTH
407 hedge funds and large institutions have $5.51B invested in Lantheus in 2026 Q1 according to their latest regulatory filings, with 70 funds opening new positions, 143 increasing their positions, 132 reducing their positions, and 48 closing their positions.
46% more first-time investments, than exits
New positions opened: 70 | Existing positions closed: 48
45% more call options, than puts
Call options by funds: $31.1M | Put options by funds: $21.4M
19% more capital invested
Capital invested by funds: $4.62B → $5.51B (+$893M)
7.05% more ownership
Funds ownership: 104.6% → 111.65% (+7%)
4% more funds holding
Funds holding: 392 → 407 (+15)
8% more repeat investments, than reductions
Existing positions increased: 143 | Existing positions reduced: 132
38% less funds holding in top 10
Funds holding in top 10: 8 → 5 (-3)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
American Century Companies
Kansas City,
Missouri
|
+$72.7M |
| 2 |
Brown Advisory
Baltimore,
Maryland
|
+$49.4M |
| 3 |
Wellington Management Group
Boston,
Massachusetts
|
+$46.8M |
| 4 |
Healthcare of Ontario Pension Plan (HOOPP) Trust Fund
Toronto,
Ontario, Canada
|
+$37.5M |
| 5 |
UBS Group
Zurich,
Switzerland
|
+$33.8M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Janus Henderson Group
London,
|
-$66.9M |
| 2 |
FGP
Freestone Grove Partners
San Francisco,
California
|
-$40.5M |
| 3 |
Citadel Advisors
Miami,
Florida
|
-$25.8M |
| 4 |
VPC
Vestal Point Capital
New York
|
-$24M |
| 5 |
Bank of America
Charlotte,
North Carolina
|
-$20.7M |
LNTH Hedge Fund Activity: Q1 2026 in Review
407 of the 8,187 institutional investors tracked by Wall St. Rank reported a position in Lantheus (LNTH) for Q1 2026, worth a combined $5.51B — up 19% from $4.62B a quarter earlier.
Buyers outnumbered sellers: 70 funds opened new LNTH positions and 48 closed out — a net gain of 22 holders — while 143 added to existing stakes and 132 trimmed.
The largest buyer was American Century Companies, adding an estimated $72.7M. The largest seller was Janus Henderson Group, cutting an estimated $66.9M.
- 407 institutional investors held Lantheus (LNTH) as of Q1 2026, up from 392 in Q4 2025.
- Funds reported $5.51B of Lantheus stock for Q1 2026, up 19% quarter-over-quarter.
- 70 funds opened new Lantheus positions in Q1 2026 and 48 closed out, a net change of +22 holders.
- The largest Lantheus buyer in Q1 2026 was American Century Companies, an estimated $72.7M added.
- The largest Lantheus seller in Q1 2026 was Janus Henderson Group, an estimated $66.9M sold.
Based on aggregated 13F filings for Q1 2026.