EcoR1 Capital Portfolio
13F Holdings & Position Changes — Last filed May 15, 2026
13F Holdings & Position Changes — Last filed May 15, 2026
Growth-stage crossover fund investing in life sciences companies from late-stage private rounds through public equity. Named after the EcoR1 restriction enzyme, reflecting the firm's scientific roots. Focuses on platform technologies and novel therapeutic modalities.
EcoR1 Capital is a $5B biotech-focused hedge fund managed by Oleg Nodelman. As of their latest 13F filing (Q1 2026), the fund holds 28 positions worth $2.3B. This quarter they initiated 5 new positions and exited 82. Their largest holding is ZYME ($575.2M).
EcoR1 initiated 5 new positions and increased 9 this quarter. Portfolio grew +6.8% to $2.3B. 256 upcoming catalysts across holdings.
Portfolio Value (13F)
$2.3B
Holdings
28
Top 10 Concentration
89.5%
QoQ Change
+6.8%
Turnover
4.5%
Portfolio Value Trend
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| # | Ticker | Company | Change | Value | % of Portfolio | SI % Float ? | Trend |
|---|---|---|---|---|---|---|---|
| 1 | ZYME | Zymeworks Inc. | $575.2M | 24.58% | 9.1% | ||
| 2 | ANAB | AnaptysBio Inc. | $437.0M | 18.68% | 35.6% | ||
| 3 | JAZZ | Jazz Pharmaceuticals plc | $322.6M | 13.79% | 6.5% | ||
| 4 | CNTA | Centessa Pharmaceuticals plc | Increased↑3Q | $238.3M | 10.19% | 1.2% | |
| 5 | CRNX | Crinetics Pharmaceuticals Inc. | $155.7M | 6.66% | 14.3% | ||
| 6 | AKTS | Aktis Oncology, Inc. | New | $86.3M | 3.69% | 18.4% | — |
| 7 | ORIC | ORIC Pharmaceuticals Inc. | $85.2M | 3.64% | 20.6% | ||
| 8 | CGON | CG Oncology, Inc. | Increased↑2Q | $74.6M | 3.19% | 12.2% | |
| 9 | CRSP | CRISPR Therapeutics AG | $66.1M | 2.82% | 27.0% | ||
| 10 | ETON | Eton Pharmaceuticals, Inc. | Increased↑5Q | $53.6M | 2.29% | 7.3% |
Share changes reflect active decisions. Value changes include price moves.
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EcoR1 Capital held 28 biotech stocks in their 13F portfolio this quarter. Their top positions include ZYME, ANAB, JAZZ, CNTA, CRNX. The full holdings table is available on BiotechEdge with position sizes, quarter-over-quarter changes, and AI analysis.
EcoR1 Capital's tracked biotech portfolio is worth $2.3B across 28 positions, with total assets under management of approximately $5B. Portfolio values are based on 13F filings with the SEC.
EcoR1 Capital initiated 5 new positions this quarter, including AKTS, EIKN, ZURA, STOK, HLXC. They also increased 9 existing positions.
EcoR1 Capital fully exited 82 positions this quarter, including PHVS, MLTX, EWTX, VERV, BEAM and 77 more. They also trimmed 4 existing positions.
Growth-stage crossover fund investing in life sciences companies from late-stage private rounds through public equity. Named after the EcoR1 restriction enzyme, reflecting the firm's scientific roots. Focuses on platform technologies and novel therapeutic modalities.
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