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Portolan Capital Management’s Lantheus LNTH Stock Holding History

Portolan Capital Management’s Portfolio LNTH Stock Details LNTH Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$31.7M Sell
417,390
-58,399
-12% -$4.19M 1.68% 16
2025
Q4 		$31.7M Buy
475,789
+178,581
+60% +$10.4M 1.7% 11
2025
Q3 		$15.2M Buy
297,208
+42,731
+17% +$2.67M 0.82% 38
2025
Q2 		$20.8M Sell
254,477
-612,832
-71% -$53.8M 1.31% 21
2025
Q1 		$84.6M Buy
867,309
+54,679
+7% +$5.11M 6.43% 1
2024
Q4 		$72.7M Buy
812,630
+141,749
+21% +$13.8M 4.89% 1
2024
Q3 		$73.6M Buy
670,881
+38,776
+6% +$4.03M 5.34% 1
2024
Q2 		$50.8M Buy
632,105
+106,363
+20% +$7.8M 4.18% 1
2024
Q1 		$32.7M Buy
525,742
+98,498
+23% +$5.8M 2.49% 3
2023
Q4 		$26.5M Sell
427,244
-47,415
-10% -$3.21M 2.32% 7
2023
Q3 		$33M Buy
474,659
+128,010
+37% +$9.36M 3.08% 5
2023
Q2 		$29.1M Buy
346,649
+118,372
+52% +$10.6M 2.58% 8
2023
Q1 		$18.8M Buy
+228,277
New +$14.7M 1.8% 9

Other funds holding LNTH

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
FCM
Farallon Capital Management San Francisco, California $17.5B AUM 50.95% 1-Year Est. Return
Janus Henderson Group
Janus Henderson Group London, United Kingdom $209B AUM 37.72% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
American Century Companies
American Century Companies Kansas City, Missouri $194B AUM 35% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return

Portolan Capital Management's LNTH Position: Q1 2026 in Review

Portolan Capital Management reduced its Lantheus (LNTH) stake by 12% in Q1 2026, selling an estimated $4.19M and leaving 417,390 shares worth $31.7M. The position accounts for 1.68% of the portfolio, ranked #16.

Portolan Capital Management first reported a position in LNTH in Q1 2023 and has held it in 13 quarters since. The position peaked at $84.6M in Q1 2025. 404 funds tracked by Wall St. Rank hold LNTH as of Q1 2026.

  • Portolan Capital Management held 417,390 shares of Lantheus worth $31.7M as of Q1 2026.
  • Portolan Capital Management sold 58,399 Lantheus shares in Q1 2026, an estimated $4.19M.
  • Lantheus made up 1.68% of Portolan Capital Management's portfolio in Q1 2026, its #16 holding.
  • Portolan Capital Management first reported a position in Lantheus in Q1 2023 and has held it in 13 quarters since.
  • Portolan Capital Management's Lantheus position peaked at $84.6M in Q1 2025.
  • 404 funds tracked by Wall St. Rank held Lantheus as of Q1 2026.

Based on Portolan Capital Management's 13F filing for Q1 2026, filed 15 May 2026.