Thompson Siegel & Walmsley’s Lantheus LNTH Stock Holding History

Thompson Siegel & Walmsley’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	$15.4M	Sell	138,733 -38,234	-22%	-$3.56M	0.28%	98
2026 Q1	$13.4M	Sell	176,967 -57,564	-25%	-$4.13M	0.24%	102
2025 Q4	$15.6M	Sell	234,531 -39,663	-14%	-$2.31M	0.26%	101
2025 Q3	$14.1M	Buy	274,194 +127,196	+87%	+$7.95M	0.23%	106
2025 Q2	$12M	Buy	146,998 +9,976	+7%	+$876K	0.2%	118
2025 Q1	$13.4M	Sell	137,022 -20,942	-13%	-$1.96M	0.22%	102
2024 Q4	$14.1M	Buy	157,964 +81,680	+107%	+$7.96M	0.22%	111
2024 Q3	$8.37M	Buy	+76,284	New	+$7.92M	0.12%	150

Other funds holding LNTH

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

Jupiter Topco New York $245B AUM

Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

American Century Companies Kansas City, Missouri $226B AUM 44.75% 1-Year Est. Return

State Street Boston, Massachusetts $3.38T AUM 44.17% 1-Year Est. Return

T. Rowe Price Associates Baltimore, Maryland $999B AUM 46.22% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Thompson Siegel & Walmsley's LNTH Position: Q2 2026 in Review

Thompson Siegel & Walmsley reduced its Lantheus (LNTH) stake by 22% in Q2 2026, selling an estimated $3.56M and leaving 138,733 shares worth $15.4M. The position accounts for 0.28% of the portfolio, ranked #98.

Thompson Siegel & Walmsley first reported a position in LNTH in Q3 2024 and has held it in 8 quarters since. The position peaked at $15.6M in Q4 2025. 468 funds tracked by Wall St. Rank hold LNTH as of Q2 2026.

Thompson Siegel & Walmsley held 138,733 shares of Lantheus worth $15.4M as of Q2 2026.
Thompson Siegel & Walmsley sold 38,234 Lantheus shares in Q2 2026, an estimated $3.56M.
Lantheus made up 0.28% of Thompson Siegel & Walmsley's portfolio in Q2 2026, its #98 holding.
Thompson Siegel & Walmsley first reported a position in Lantheus in Q3 2024 and has held it in 8 quarters since.
Thompson Siegel & Walmsley's Lantheus position peaked at $15.6M in Q4 2025.
468 funds tracked by Wall St. Rank held Lantheus as of Q2 2026.

Based on Thompson Siegel & Walmsley's 13F filing for Q2 2026, filed 11 Aug 2026.