Question 1

How many shares of LBRX does RA CAPITAL MANAGEMENT, L.P. own?

Accepted Answer

As of 2026-Q2, RA CAPITAL MANAGEMENT, L.P. holds 2.2M shares of LBRX (LB PHARMACEUTICALS INC).

Question 2

What is RA CAPITAL MANAGEMENT, L.P.'s LBRX position worth?

Accepted Answer

As of 2026-Q2, RA CAPITAL MANAGEMENT, L.P.'s LBRX position is worth $71.7M.

Question 3

When did RA CAPITAL MANAGEMENT, L.P. first buy LBRX?

Accepted Answer

Based on available 13F filings, RA CAPITAL MANAGEMENT, L.P. first reported a position in LBRX in 2025-Q3. They have held the position across 4 quarters.

Quarter	Action	Shares	Change	Value	Weight	Price	Conviction
2026-Q2 Latest	Unchanged	2.2M	0.0%	$71.7M	0.6%	$32.46	0
2026-Q1	Unchanged	2.2M	0.0%	$54.5M	0.6%	$23.91	0
2025-Q4	Increased	2.2M	+24.3%	$49.2M	0.5%	$21.50	50
2025-Q3	New	1.8M	—	$28.1M	0.3%	$15.24	48