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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
Q2 		$32M Sell
288,691
-128,699
-31% -$12M 1.2% 23
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 $6.73T AUM 46.02% 1-Year Est. Return
FCM
Farallon Capital Management San Francisco, California $21.7B AUM 79.24% 1-Year Est. Return
JT
Jupiter Topco New York $245B AUM
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
American Century Companies
American Century Companies Kansas City, Missouri $226B AUM 44.75% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
T. Rowe Price Associates
T. Rowe Price Associates Baltimore, Maryland $999B AUM 46.22% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Portolan Capital Management's LNTH Position: Q2 2026 in Review

Portolan Capital Management reduced its Lantheus (LNTH) stake by 31% in Q2 2026, selling an estimated $12M and leaving 288,691 shares worth $32M. The position accounts for 1.2% of the portfolio, ranked #23.

Portolan Capital Management first reported a position in LNTH in Q1 2023 and has held it in 14 quarters since. The position peaked at $84.6M in Q1 2025. 467 funds tracked by Wall St. Rank hold LNTH as of Q2 2026.

  • Portolan Capital Management held 288,691 shares of Lantheus worth $32M as of Q2 2026.
  • Portolan Capital Management sold 128,699 Lantheus shares in Q2 2026, an estimated $12M.
  • Lantheus made up 1.2% of Portolan Capital Management's portfolio in Q2 2026, its #23 holding.
  • Portolan Capital Management first reported a position in Lantheus in Q1 2023 and has held it in 14 quarters since.
  • Portolan Capital Management's Lantheus position peaked at $84.6M in Q1 2025.
  • 467 funds tracked by Wall St. Rank held Lantheus as of Q2 2026.

Based on Portolan Capital Management's 13F filing for Q2 2026, filed 14 Aug 2026.