Question 1

How many shares of LNTH does WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC own?

Accepted Answer

As of 2026-Q2, WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC holds 232,597 shares of LNTH (LANTHEUS HOLDINGS INC).

Question 2

What is WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC's LNTH position worth?

Accepted Answer

As of 2026-Q2, WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC's LNTH position is worth $25.8M.

Question 3

Is WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC buying or selling LNTH?

Accepted Answer

In 2026-Q2, WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC decreased their LNTH position (-41.8% change in shares).

Question 4

When did WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC first buy LNTH?

Accepted Answer

Based on available 13F filings, WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC first reported a position in LNTH in 2024-Q3. They have held the position across 21 quarters.

Quarter	Action	Shares	Change	Value	Weight	Price	Conviction
2026-Q2 Latest	Decreased	232,597	-41.8%	$25.8M	0.1%	$110.94	0
2026-Q1	Decreased	399,551	-23.5%	$30.3M	0.1%	$78.84	0
2025-Q4	Decreased	522,177	-9.1%	$34.8M	0.1%	$67.16	0
2025-Q3	Increased	574,681	+46.7%	$29.5M	0.1%	$50.62	39
2025-Q2	Increased	391,622	+7.7%	$32.1M	0.1%	$81.49	31
2025-Q1	Decreased	363,767	-4.3%	$35.5M	0.1%	$96.16	0
2024-Q4	Increased	380,324	+2.5%	$34M	0.1%	$89.13	30
2024-Q3	Decreased	371,079	-26.6%	$40.7M	0.1%	$107.36	0