EcoR1 Capital, LLC
CIK 0001587114 · SAN FRANCISCO, CA · Quarter end: 2026-06-30 · Filed on: 2026-08-14 · Open the SEC source ↗
Portfolio Value (AUM)Total value of the fund's US stock portfolio reported to the SEC.
$2.06B
2026 Q2
Positions
33
Top-10 ConcentrationHow much of the portfolio sits in the 10 largest holdings. High = concentrated bets.
86.3%
Est. Net Flow (Q)
—
2026 Q2
Top Holdings
ZYME
ZYMEWORKS INC
29.2%
ANAB
ANAPTYSBIO INC
25.9%
AKTS
AKTIS ONCOLOGY INC
7.6%
CGON
CG ONCOLOGY INC
5.2%
ETON
ETON PHARMACEUTICALS INC
3.8%
CRSP
CRISPR THERAPEUTICS AG
3.7%
ORIC
ORIC PHARMACEUTICALS INC
3.5%
TRAX
FIRST TRACKS BIOTHERAPEUTICS
3.1%
New / Increased
No prior quarter data
Reduced / Exited
No prior quarter data
Read the 2026-Q2 quarterly report · 13F Filing Calendar
13F data shows quarter-end positions, is delayed by up to 45 days and covers only long positions in US-listed securities; short positions, most derivatives and non-US assets are not reported.