☆EcoR1 Capital, LLC
Quality Q
0.612
AUM ($M)
2,017
Positions
31
Turnover
0.33
Top-10 wt
88%
Herfindahl
0.174
History (qtrs)
6
Excess Return
+14.7%
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Holdings · 38 positions · portfolio value $2,017M
| Ticker | Name | Activity | Security Type | Weight | Δ Weight | Value ($M) | Shares | Δ Shares | Qtrs Held | Excess Return |
|---|---|---|---|---|---|---|---|---|---|---|
| ☆ZYME funds › | ZYMEWORKS INC | HOLD | — | 29.8% | +5.2% | 600.4 | 22,970,388 | +0 | 5 | — |
| ☆ANAB funds › | ANAPTYSBIO INC | HOLD | — | 26.4% | +7.7% | 531.9 | 7,880,094 | +0 | 5 | — |
| ☆AKTS funds › | AKTIS ONCOLOGY INC | HOLD | — | 7.7% | +4.0% | 155.5 | 4,824,469 | +0 | 2 | +64.7% |
| ☆CGON funds › | CG ONCOLOGY INC | ADD | — | 5.3% | +2.1% | 106.2 | 1,494,300 | +392,300 | 3 | +100.1% |
| ☆ETON funds › | ETON PHARMACEUTICALS INC | HOLD | — | 3.9% | +1.6% | 78.6 | 2,171,938 | +0 | 5 | — |
| ☆CRSP funds › | CRISPR THERAPEUTICS AG | HOLD | — | 3.8% | +0.9% | 75.8 | 1,389,276 | +0 | 5 | — |
| ☆ORIC funds › | ORIC PHARMACEUTICALS INC | HOLD | — | 3.6% | -0.0% | 72.9 | 6,728,116 | +0 | 5 | — |
| ☆TRAX funds › | FIRST TRACKS BIOTHERAPEUTICS | NEW | — | 3.2% | +3.2% | 63.9 | 3,174,519 | +3,174,519 | 1 | +4180.6% |
| ☆LKFT funds › | LAKEFRONT BIOTHERAPEUTICS NV | HOLD | — | 2.5% | +0.3% | 50.0 | 1,667,119 | +0 | 5 | — |
| ☆NGNE funds › | NEUROGENE INC | HOLD | — | 2.0% | +0.9% | 40.0 | 1,271,342 | +0 | 5 | — |
| ☆STOK funds › | STOKE THERAPEUTICS INC | ADD | — | 1.2% | +1.1% | 24.0 | 735,000 | +635,000 | 2 | -30.4% |
| ☆FULC funds › | FULCRUM THERAPEUTICS INC | NEW | — | 1.2% | +1.2% | 24.0 | 6,549,866 | +6,549,866 | 1 | -111.0% |
| ☆LEGN funds › | LEGEND BIOTECH CORP | NEW | — | 1.1% | +1.1% | 23.1 | 800,000 | +800,000 | 1 | -93.1% |
| ☆BBOT funds › | BRIDGEBIO ONCOLOGY THERAPEUT | HOLD | — | 1.1% | -0.0% | 21.5 | 2,823,126 | +0 | 4 | -37.1% |
| ☆MBX funds › | MBX BIOSCIENCES INC | TRIM | — | 1.1% | +0.1% | 21.4 | 388,500 | -388,500 | 5 | — |
| ☆ZBIO funds › | ZENAS BIOPHARMA INC | HOLD | — | 1.0% | +0.3% | 20.0 | 789,500 | +0 | 3 | -47.7% |
| ☆ATRA funds › | ATARA BIOTHERAPEUTICS INC | ADD | — | 0.9% | +0.9% | 17.8 | 1,552,000 | +1,452,407 | 5 | — |
| ☆RLAY funds › | RELAY THERAPEUTICS INC | TRIM | — | 0.6% | -0.2% | 13.1 | 697,948 | -1,206,814 | 2 | +357.8% |
| ☆AURA funds › | AURA BIOSCIENCES INC | NEW | — | 0.6% | +0.6% | 11.8 | 1,666,667 | +1,666,667 | 1 | -11.5% |
| ☆ODTX funds › | ODYSSEY THERAPEUTICS INC | NEW | — | 0.5% | +0.5% | 10.4 | 555,555 | +555,555 | 1 | +83.1% |
| ☆EIKN funds › | EIKON THERAPEUTICS INC | HOLD | — | 0.5% | +0.1% | 9.6 | 732,606 | +0 | 2 | -83.0% |
| ☆PHVS funds › | PHARVARIS N V | NEW | — | 0.4% | +0.4% | 8.1 | 235,000 | +235,000 | 1 | +103.8% |
| ☆ZURA funds › | ZURA BIO LTD | HOLD | — | 0.3% | +0.0% | 7.0 | 1,179,715 | +0 | 2 | -48.8% |
| ☆PHAT funds › | PHATHOM PHARMACEUTICALS INC | HOLD | — | 0.3% | +0.0% | 6.8 | 625,000 | +0 | 2 | -76.0% |
| ☆NRIX funds › | NURIX THERAPEUTICS INC | NEW | — | 0.3% | +0.3% | 6.6 | 270,000 | +270,000 | 1 | +881.7% |
| ☆ERAS funds › | ERASCA INC | TRIM | — | 0.3% | -0.3% | 6.0 | 330,000 | -570,000 | 2 | +90.9% |
| ☆ELOX funds › | ELOXX PHARMACEUTICALS INC | NEW | — | 0.3% | +0.3% | 5.6 | 400,000 | +400,000 | 1 | +1775.6% |
| ☆AARD funds › | AARDVARK THERAPEUTICS INC | NEW | — | 0.1% | +0.1% | 2.3 | 396,194 | +396,194 | 1 | +413.9% |
| ☆HLXC funds › | HELIX ACQUISITION CORP III USD | HOLD | — | 0.1% | +0.0% | 2.1 | 200,000 | +0 | 2 | -14.1% |
| ☆MREO funds › | MEREO BIOPHARMA GROUP PLC | TRIM | — | 0.0% | -0.2% | 0.3 | 1,000,000 | -12,368,855 | 3 | -114.7% |
| ☆CUSIP:86889P117 funds › | SURROZEN INC | HOLD | — | 0.0% | +0.0% | 0.1 | 4,444 | +0 | 5 | — |
| ☆REPL funds › | REPLIMUNE GROUP INC | EXIT | — | 0.0% | -0.3% | 0.0 | 0 | -1,000,000 | 0 | -116.9% re-entry |
| ☆CUSIP:152309100 funds › | CENTESSA PHARMACEUTICALS PLC | EXIT | — | 0.0% | -10.2% | 0.0 | 0 | -6,000,000 | 0 | — |
| ☆PRLD funds › | PRELUDE THERAPEUTICS INC | EXIT | — | 0.0% | -0.1% | 0.0 | 0 | -947,049 | 0 | +1727.7% |
| ☆XNCR funds › | XENCOR INC | EXIT | — | 0.0% | -1.1% | 0.0 | 0 | -2,183,000 | 0 | — |
| ☆CRNX funds › | CRINETICS PHARMACEUTICALS IN | EXIT | — | 0.0% | -6.7% | 0.0 | 0 | -4,288,120 | 0 | — |
| ☆IBIO funds › | IBIO INC | EXIT | — | 0.0% | -0.1% | 0.0 | 0 | -1,583,000 | 0 | +42.3% |
| ☆JAZZ funds › | JAZZ PHARMACEUTICALS PLC | EXIT | — | 0.0% | -13.8% | 0.0 | 0 | -1,706,469 | 0 | — |
Point-in-time history
| Period | AUM ($M) | Positions | Turnover | Top-10 wt | Herfindahl | Quality Q | Skill | Universe |
|---|---|---|---|---|---|---|---|---|
| 2026Q2 | 2,017 | 31 | 0.33 | 88% | 0.174 | 0.610 | — | in |
| 2026Q1 | 2,340 | 29 | 0.19 | 90% | 0.135 | 0.870 | — | in |
| 2025Q4 | 2,191 | 28 | 0.29 | 85% | 0.140 | 0.636 | — | in |
| 2025Q3 | 2,084 | 30 | 0.25 | 81% | 0.091 | 0.684 | — | in |
| 2025Q2 | 1,687 | 36 | 0.24 | 77% | 0.083 | 0.667 | — | entered |
| 2025Q1 | 1,684 | 44 | 0.00 | 80% | 0.084 | 0.000 | — | out |
Long US-equity 13F disclosures only · up to 45-day reporting lag · sells = reduce/avoid, not short.
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