EcoR1 Capital Fund, L.P.
EcoR1 Capital Fund, L.P. is a hedge fund based in San Francisco, California. According to its most recent Form D, filed Jan 22, 2026, the fund has sold $117,778,169 of interests to 99 investors since its first sale in Mar 2013. The minimum investment it accepts from an outside investor is $25,000,000. It relies on the Section 3(c)(1) exclusion, which limits it to 100 beneficial owners, typically accredited investors. The offering uses Rule 506(b), which does not permit general solicitation. Related persons named in the filing include Scott Perlen; Sarah Marriott; EcoR1 Capital, LLC.
Performance
No verified returns have been reported for this fund. As a rough guide, Ecor1 Capital, LLC, which manages it, disclosed U.S. stock holdings that returned an estimated +21.3% 2026 YTD through Jun 30 (S&P 500: +9.5%), based only on its public 13F filings. Over a longer period, Q3 2024 to Q2 2026, the estimate is +16.0% (S&P 500: +37.2%).
This estimate covers the firm's whole disclosed long U.S. stock portfolio. It is not this fund's return and excludes dividends, fees, shorts, derivatives, bonds, cash and trading within each quarter.
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- Total raised
- $117,778,169Cumulative sales reported on Form D
- Investors
- 99
- First sale
- Mar 1, 2013
- Minimum investment
- $25,000,000
- Who can invest
- Accredited investorsSection 3(c)(1): up to 100 beneficial owners
- Offering exemption
- Rule 506(b)No general advertising
- Key people and entities
- Scott Perlen; Sarah Marriott; EcoR1 Capital, LLC
- Latest Form D
- Jan 22, 2026
From SEC filings, not verified. This page republishes the fund's Form D as filed. It is not an offer, solicitation or recommendation, and AltMountain has not reviewed the fund. “Raised” is cumulative sales, not current assets or performance. Private funds are speculative, illiquid and generally limited to accredited investors or qualified purchasers. Full disclosures · Request a correction
Questions about EcoR1 Capital Fund, L.P.
What is the minimum investment for EcoR1 Capital Fund, L.P.?
According to its latest Form D, filed Jan 22, 2026, the minimum investment EcoR1 Capital Fund, L.P. accepts from an outside investor is $25,000,000.
Who can invest in EcoR1 Capital Fund, L.P.?
EcoR1 Capital Fund, L.P. is generally open only to accredited investors, and it may have no more than 100 beneficial owners because it relies on Section 3(c)(1). It uses Rule 506(b), which does not allow general advertising.
How much has EcoR1 Capital Fund, L.P. raised?
EcoR1 Capital Fund, L.P. reports $117,778,169 sold from 99 investors on its Form D filed Jan 22, 2026. This is cumulative sales since the offering began, not current assets or performance.
Where is EcoR1 Capital Fund, L.P. based?
EcoR1 Capital Fund, L.P. is based in San Francisco, California and is managed by Ecor1 Capital, LLC.
When did EcoR1 Capital Fund, L.P. launch?
EcoR1 Capital Fund, L.P. reports its first sale in Mar 2013.
Size compared with every hedge fund
Raised more than 69% of the 1,060 hedge funds based in California, and more than 60% of all 10,308 that report sales.