EcoR1 Capital, LLC
CIK 1587114
13F filing for Q2 2026・No. 1,607
- Holdings
- US$2.06B
- Quarter change
- −US$299.59M
- Entries
- 33
- Net bought (estimate)
- −US$549.08M
The quarter change is the holdings' value against the quarter before, price moves included — not what was bought or sold; each institution's page estimates that.
Net bought (estimate)
Each stock's change in shares at the quarter-end price, added up: a new position counts as bought, one sold out as sold, shares held long only. Splits are compared split-adjusted; corporate actions under a new CUSIP are not estimated. An estimate from the filings, not actual trades.
- New 9
- Sold out 7
- Cut 2
- Added 4
- Corporate actions 0
- Unchanged 16
Largest holdings
31 stocks worth US$2.02B, options and bonds left out.
| Stock | This quarter | Shares | Value | Weight |
|---|---|---|---|---|
| ZYMEWORKS INCCOM | Unchanged | 22,970,388 | US$600.45M | 29.77% |
| ANAPTYSBIO INCCOM | Unchanged | 7,880,094 | US$531.91M | 26.37% |
| AKTSAKTIS ONCOLOGY INCCOM | Unchanged | 4,824,469 | US$155.49M | 7.71% |
| CG ONCOLOGY INCCOM | Added | 1,494,300 | US$106.17M | 5.26% |
| ETON PHARMACEUTICALS INCCOM | Unchanged | 2,171,938 | US$78.62M | 3.90% |
| CRSPCRISPR THERAPEUTICS AGNAMEN AKT | Unchanged | 1,389,276 | US$75.77M | 3.76% |
| ORIC PHARMACEUTICALS INCCOM | Unchanged | 6,728,116 | US$72.87M | 3.61% |
| FIRST TRACKS BIOTHERAPEUTICSORD SHS ADDED | New | 3,174,519 | US$63.87M | 3.17% |
| LAKEFRONT BIOTHERAPEUTICS NVSPON ADR | Unchanged | 1,667,119 | US$49.98M | 2.48% |
| NEUROGENE INCCOM | Unchanged | 1,271,342 | US$39.98M | 1.98% |
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Filings
The quarter's original 13F filings (SEC).
- 13F-HRFiled August 14, 2026SEC ↗
13F covers long positions in US-listed securities only; the data is SEC's, filed within 45 days of the quarter's end.