EcoR1 Capital’s Solid Biosciences SLDB Stock Holding History

EcoR1 Capital’s Portfolio SLDB Stock Details SLDB Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2025 Q2	–	Sell	-744,450	Closed	-$2.75M	–	47
2025 Q1	$2.75M	Buy	+744,450	New	+$3.19M	0.16%	34
2022 Q2	–	Sell	-171,007	Closed	-$3.08M	–	94
2022 Q1	$3.08M	Sell	171,007 -442,506	-72%	-$7.81M	0.1%	59
2021 Q4	$16.1M	Hold	613,513	–	–	0.51%	31
2021 Q3	$22M	Hold	613,513	–	–	0.77%	24
2021 Q2	$33.7M	Hold	613,513	–	–	1.26%	17
2021 Q1	$50.9M	Buy	613,513 +81,666	+15%	+$9.04M	2.26%	14
2020 Q4	$60.5M	Buy	+531,847	New	+$33.6M	3.25%	11
2019 Q4	–	Sell	-222,846	Closed	-$34.6M	–	53
2019 Q3	$34.6M	Buy	222,846 +167,713	+304%	+$19M	4.36%	10
2019 Q2	$4.75M	Buy	+55,133	New	+$6.01M	0.48%	31
2019 Q1	–	Sell	-57,816	Closed	-$23.2M	–	53
2018 Q4	$23.2M	Buy	+57,816	New	+$27.2M	2.33%	15

Other funds holding SLDB

Perceptive Advisors New York $6.66B AUM 360.84% 1-Year Est. Return

BCLSI

Bain Capital Life Sciences Investors Boston, Massachusetts $1.68B AUM 126.09% 1-Year Est. Return

Siren LLC Greenwich, Connecticut $4.94B AUM 244.43% 1-Year Est. Return

Adage Capital Partners Boston, Massachusetts $71.3B AUM 56.8% 1-Year Est. Return

RCM

RA Capital Management Boston, Massachusetts $11.5B AUM 168.77% 1-Year Est. Return

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

Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return

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

Citadel Advisors Miami, Florida $875B AUM 40.91% 1-Year Est. Return

MIM

Monashee Investment Management Boston, Massachusetts $59.6M AUM 181.61% 1-Year Est. Return

EcoR1 Capital's SLDB Position: Q2 2025 in Review

EcoR1 Capital sold out of Solid Biosciences (SLDB) in Q2 2025, closing a stake of 744,450 shares — an estimated $2.75M sold.

EcoR1 Capital first reported a position in SLDB in Q4 2018 and held it in 10 quarters. The position peaked at $60.5M in Q4 2020. 114 funds tracked by Wall St. Rank hold SLDB as of Q2 2025.

EcoR1 Capital reported no remaining Solid Biosciences position as of Q2 2025 after selling out during the quarter.
EcoR1 Capital sold 744,450 Solid Biosciences shares in Q2 2025, an estimated $2.75M.
EcoR1 Capital first reported a position in Solid Biosciences in Q4 2018 and held it in 10 quarters.
EcoR1 Capital's Solid Biosciences position peaked at $60.5M in Q4 2020.
114 funds tracked by Wall St. Rank held Solid Biosciences as of Q2 2025.

Based on EcoR1 Capital's 13F filing for Q2 2025, filed 14 Aug 2025.