William Blair Investment Management
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William Blair Investment Management’s Lantheus LNTH Stock Holding History

William Blair Investment 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 		$25.8M Sell
232,597
-166,954
-42% -$15.6M 0.08% 209
2026
Q1 		$30.3M Sell
399,551
-122,626
-23% -$8.8M 0.1% 188
2025
Q4 		$34.8M Sell
522,177
-52,504
-9% -$3.06M 0.1% 178
2025
Q3 		$29.5M Buy
574,681
+183,059
+47% +$11.4M 0.08% 218
2025
Q2 		$32.1M Buy
391,622
+27,855
+8% +$2.45M 0.09% 192
2025
Q1 		$35.5M Sell
363,767
-16,557
-4% -$1.55M 0.1% 182
2024
Q4 		$34M Buy
380,324
+9,245
+2% +$901K 0.08% 221
2024
Q3 		$40.7M Sell
371,079
-134,502
-27% -$14M 0.1% 163
2024
Q2 		$40.6M Sell
505,581
-54,253
-10% -$3.98M 0.11% 162
2024
Q1 		$34.8M Buy
559,834
+3,124
+0.6% +$184K 0.09% 213
2023
Q4 		$34.5M Buy
556,710
+214,702
+63% +$14.5M 0.1% 201
2023
Q3 		$23.8M Buy
342,008
+14,243
+4% +$1.04M 0.08% 247
2023
Q2 		$27.5M Sell
327,765
-178,482
-35% -$16M 0.09% 242
2023
Q1 		$41.8M Sell
506,247
-81,496
-14% -$5.26M 0.15% 143
2022
Q4 		$30M Sell
587,743
-10,585
-2% -$653K 0.11% 202
2022
Q3 		$42.1M Sell
598,328
-180,835
-23% -$13.7M 0.17% 126
2022
Q2 		$51.4M Sell
779,163
-438,544
-36% -$27.6M 0.19% 128
2022
Q1 		$67.4M Sell
1,217,707
-995,322
-45% -$37.3M 0.2% 134
2021
Q4 		$63.9M Sell
2,213,029
-418,217
-16% -$11.1M 0.17% 141
2021
Q3 		$67.6M Buy
2,631,246
+2,625,646
+46,887% +$68.6M 0.19% 130
2021
Q2 		$155K Buy
+5,600
New +$129K ﹤0.01% 367

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

William Blair Investment Management's LNTH Position: Q2 2026 in Review

William Blair Investment Management reduced its Lantheus (LNTH) stake by 42% in Q2 2026, selling an estimated $15.6M and leaving 232,597 shares worth $25.8M. The position accounts for 0.08% of the portfolio, ranked #209.

William Blair Investment Management first reported a position in LNTH in Q2 2021 and has held it in 21 quarters since. The position peaked at $67.6M in Q3 2021. 466 funds tracked by Wall St. Rank hold LNTH as of Q2 2026.

  • William Blair Investment Management held 232,597 shares of Lantheus worth $25.8M as of Q2 2026.
  • William Blair Investment Management sold 166,954 Lantheus shares in Q2 2026, an estimated $15.6M.
  • Lantheus made up 0.08% of William Blair Investment Management's portfolio in Q2 2026, its #209 holding.
  • William Blair Investment Management first reported a position in Lantheus in Q2 2021 and has held it in 21 quarters since.
  • William Blair Investment Management's Lantheus position peaked at $67.6M in Q3 2021.
  • 466 funds tracked by Wall St. Rank held Lantheus as of Q2 2026.

Based on William Blair Investment Management's 13F filing for Q2 2026, filed 12 Aug 2026.