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Castleark Management’s Lantheus LNTH Stock Holding History

Castleark 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
2025
Q2 		– Sell
-37,500
Closed -$3.66M – 314
2025
Q1 		$3.66M Buy
+37,500
New +$3.51M 0.13% 152
2024
Q4 		– Sell
-83,640
Closed -$9.18M – 311
2024
Q3 		$9.18M Buy
83,640
+26,890
+47% +$2.79M 0.37% 50
2024
Q2 		$4.56M Buy
+56,750
New +$4.16M 0.19% 123
2023
Q1 		– Sell
-84,850
Closed -$4.32M – 307
2022
Q4 		$4.32M Sell
84,850
-1,970
-2% -$122K 0.23% 106
2022
Q3 		$6.11M Sell
86,820
-1,860
-2% -$141K 0.34% 66
2022
Q2 		$5.86M Buy
88,680
+46,730
+111% +$2.95M 0.31% 70
2022
Q1 		$2.32M Buy
+41,950
New +$1.57M 0.1% 176
2018
Q1 		– Sell
-218,341
Closed -$4.46M – 421
2017
Q4 		$4.46M Sell
218,341
-72,049
-25% -$1.47M 0.13% 205
2017
Q3 		$5.17M Sell
290,390
-45,940
-14% -$807K 0.16% 183
2017
Q2 		$5.94M Buy
+336,330
New +$4.95M 0.19% 162

Other funds holding LNTH

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Janus Henderson Group
Janus Henderson Group London, United Kingdom $209B AUM 37.72% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
FCM
Farallon Capital Management San Francisco, California $17.5B AUM 50.95% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return
Westfield Capital Management
Westfield Capital Management Boston, Massachusetts $23.8B AUM 49.45% 1-Year Est. Return

Castleark Management's LNTH Position: Q2 2025 in Review

Castleark Management sold out of Lantheus (LNTH) in Q2 2025, closing a stake of 37,500 shares — an estimated $3.66M sold.

Castleark Management first reported a position in LNTH in Q2 2017 and held it in 10 quarters. The position peaked at $9.18M in Q3 2024. 475 funds tracked by Wall St. Rank hold LNTH as of Q2 2025.

  • Castleark Management reported no remaining Lantheus position as of Q2 2025 after selling out during the quarter.
  • Castleark Management sold 37,500 Lantheus shares in Q2 2025, an estimated $3.66M.
  • Castleark Management first reported a position in Lantheus in Q2 2017 and held it in 10 quarters.
  • Castleark Management's Lantheus position peaked at $9.18M in Q3 2024.
  • 475 funds tracked by Wall St. Rank held Lantheus as of Q2 2025.

Based on Castleark Management's 13F filing for Q2 2025, filed 18 Aug 2025.