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Sirios Capital Management’s Lantheus LNTH Stock Holding History

Sirios 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
2025
Q4 		– Sell
-9,074
Closed -$465K – 78
2025
Q3 		$465K Sell
9,074
-7,880
-46% -$492K 0.06% 68
2025
Q2 		$1.39M Sell
16,954
-233
-1% -$20.5K 0.2% 51
2025
Q1 		$1.68M Sell
17,187
-5,996
-26% -$561K 0.3% 47
2024
Q4 		$2.07M Buy
23,183
+4,310
+23% +$420K 0.37% 40
2024
Q3 		$2.07M Sell
18,873
-6,353
-25% -$660K 0.37% 43
2024
Q2 		$2.03M Sell
25,226
-9,283
-27% -$681K 0.35% 43
2024
Q1 		$2.15M Sell
34,509
-11,503
-25% -$677K 0.4% 41
2023
Q4 		$2.85M Sell
46,012
-3,234
-7% -$219K 0.58% 36
2023
Q3 		$3.42M Buy
49,246
+11,246
+30% +$823K 0.65% 38
2023
Q2 		$3.19M Sell
38,000
-33,505
-47% -$3.01M 0.55% 35
2023
Q1 		$5.9M Sell
71,505
-2,130
-3% -$137K 1.04% 33
2022
Q4 		$3.75M Buy
73,635
+17,116
+30% +$1.06M 0.69% 32
2022
Q3 		$3.98M Buy
+56,519
New +$4.28M 0.74% 35

Other funds holding LNTH

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
Janus Henderson Group
Janus Henderson Group London $209B AUM 37.72% 1-Year Est. Return
FCM
Farallon Capital Management San Francisco, California $21.7B AUM 79.24% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
RP
Reinhart Partners Mequon, Wisconsin $4.38B AUM 55.55% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return

Sirios Capital Management's LNTH Position: Q4 2025 in Review

Sirios Capital Management sold out of Lantheus (LNTH) in Q4 2025, closing a stake of 9,074 shares — an estimated $465K sold.

Sirios Capital Management first reported a position in LNTH in Q3 2022 and held it in 13 quarters. The position peaked at $5.9M in Q1 2023. 393 funds tracked by Wall St. Rank hold LNTH as of Q4 2025.

  • Sirios Capital Management reported no remaining Lantheus position as of Q4 2025 after selling out during the quarter.
  • Sirios Capital Management sold 9,074 Lantheus shares in Q4 2025, an estimated $465K.
  • Sirios Capital Management first reported a position in Lantheus in Q3 2022 and held it in 13 quarters.
  • Sirios Capital Management's Lantheus position peaked at $5.9M in Q1 2023.
  • 393 funds tracked by Wall St. Rank held Lantheus as of Q4 2025.

Based on Sirios Capital Management's 13F filing for Q4 2025, filed 13 Feb 2026.