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Ecor1 Capital, LLC

CIK:0001587114
Hedge Fund
$5B AUM
37 holdings
San Francisco, CA, United States
Founded:2013
21 employees
Latest filing:Jun 30, 2025

EcoR1 Capital, LLC is a San Francisco-based hedge fund focused exclusively on biotechnology and life sciences investments. Founded in 2013, the firm manages approximately $5 billion in assets and employs around 21 staff members. EcoR1 serves institutional and accredited investors seeking dedicated exposure to the biotech sector through concentrated, research-driven public equity portfolios.

Investment Strategy

EcoR1 Capital deploys a highly focused strategy investing in publicly traded biotechnology companies, leveraging deep scientific expertise and a disciplined research process. The firm targets overlooked or misunderstood opportunities in the life sciences sector, relying on rigorous due diligence and close engagement with industry experts to identify companies with novel therapies or platforms capable of driving outsized, risk-adjusted returns. EcoR1 typically maintains a concentrated portfolio and seeks to create value by holding investments through fundamental inflection points.

Top Buys
I
ITOSITEOS THERAPEUTICS INC
+$106.6M
Z
ZYMEZYMEWORKS INC
+$82.7M
T
TNGXTANGO THERAPEUTICS INC
+$39.9M
A
ANABANAPTYSBIO INC
+$28.4M
G
GLPGGALAPAGOS NV
+$25.1M
Top Sells
P
PRTAPROTHENA CORP PLC
-$143.4M
S
SRPTSAREPTA THERAPEUTICS INC
-$82.5M
A
APLSAPELLIS PHARMACEUTICALS INC
-$54.2M
J
JAZZJAZZ PHARMACEUTICALS PLC
-$30.8M
C
CRNXCRINETICS PHARMACEUTICALS IN
-$20.5M

Top Holdings

Z
ZYMEZYMEWORKS INC
+17.1%$288.3M
A
APLSAPELLIS PHARMACEUTICALS INC
+12.2%$205.9M
J
JAZZJAZZ PHARMACEUTICALS PLC
+10.7%$181.1M
A
ANABANAPTYSBIO INC
+10.4%$174.9M
C
CRNXCRINETICS PHARMACEUTICALS IN
+7.3%$123.3M

Equity Positions (36)

TickerSecurityWeightMarket ValueSharesAvg CostPriceChange (QoQ)
Z
ZYME
ZYMEWORKS INC17.06%$288.3M22,970,388$10.13$12.55+$82.7M
A
APLS
APELLIS PHARMACEUTICALS INC12.19%$205.9M11,895,808$43.61$17.31-$54.2M
J
JAZZ
JAZZ PHARMACEUTICALS PLC10.72%$181.1M1,706,469$118.51$106.12-$30.8M
A
ANAB
ANAPTYSBIO INC10.36%$174.9M7,880,094$19.63$22.20+$28.4M
C
CRNX
CRINETICS PHARMACEUTICALS IN7.30%$123.3M4,288,120$37.51$28.76-$20.5M

Options Positions (1)

TickerSecurityActionTypeNotional ValueContractsUnderlying PricePremium PaidChange (Contracts)Change (Value)
Q
QURE
UNIQURE NV
Call
$1.9M1,350$13.94$17.660+$450.9K

Industry Allocation

PHARMACEUTICAL PREPARATIONS
+103.5%
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
+13.6%