RA Capital Management’s LB Pharmaceuticals LBRX Stock Holding History

RA Capital Management’s Portfolio LBRX Stock Details LBRX Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q2	$71.7M	Hold	2,208,604	–	–	0.62%	31
2026 Q1	$54.5M	Hold	2,208,604	–	–	0.58%	33
2025 Q4	$49.2M	Buy	2,208,604 +431,646	+24%	+$7.54M	0.5%	36
2025 Q3	$28.1M	Buy	+1,776,958	New	+$28.2M	0.35%	37

Other funds holding LBRX

DTC

Deep Track Capital Greenwich, Connecticut $6.87B AUM 205.24% 1-Year Est. Return

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

TECP

Trails Edge Capital Partners Atlanta, Georgia $630M AUM

JP Morgan Chase New York $1.81T AUM 41.13% 1-Year Est. Return

Commodore Capital New York $1.68B AUM 375.52% 1-Year Est. Return

TCM

TCG Crossover Management Palo Alto, California $4.16B AUM 983.43% 1-Year Est. Return

Caligan Partners New York $2.13B AUM 758.65% 1-Year Est. Return

SSC

Spruce Street Capital New York $510M AUM

NCM

Nantahala Capital Management New Canaan, Connecticut $3.01B AUM 119.46% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

RA Capital Management's LBRX Position: Q2 2026 in Review

RA Capital Management held its LB Pharmaceuticals (LBRX) position steady in Q2 2026 at 2,208,604 shares worth $71.7M. The position accounts for 0.62% of the portfolio, ranked #31.

RA Capital Management first reported a position in LBRX in Q3 2025 and has held it in 4 quarters since. 115 funds tracked by Wall St. Rank hold LBRX as of Q2 2026.

RA Capital Management held 2,208,604 shares of LB Pharmaceuticals worth $71.7M as of Q2 2026.
RA Capital Management left its LB Pharmaceuticals share count unchanged in Q2 2026.
LB Pharmaceuticals made up 0.62% of RA Capital Management's portfolio in Q2 2026, its #31 holding.
RA Capital Management first reported a position in LB Pharmaceuticals in Q3 2025 and has held it in 4 quarters since.
115 funds tracked by Wall St. Rank held LB Pharmaceuticals as of Q2 2026.

Based on RA Capital Management's 13F filing for Q2 2026, filed 14 Aug 2026.