13FBOX
EcoR1 Capital, LLC · 13F Holdings
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EcoR1 Capital, LLC

No.1714 Data as of 2026Q2
Latest AUM (Q2 2026)
$2.06B
QoQ Change Q1 2026
-$299.7M-12.7%
Holdings
31
New Buys
9
Adds
3
Reduces
4
Exits
7
Unchanged
15
Holdings Value Trend
Holdings by Sector
Stock Ownership TrendPortfolio %Prev Q %Q2 2026 ValueQ2 2026 SharesPrev Q ValuePrev Q SharesShares ChangeAction
ZYMEWORKS INCZYME
29.2%24.41%$600.4M23.0M$575.2M23.0M00.00%Unchanged
AANAPTYSBIO INCANAB
25.86%18.55%$531.9M7.9M$437.0M7.9M00.00%Unchanged
AAKTIS ONCOLOGY INCAKTS
7.56%3.66%$155.5M4.8M$86.3M4.8M00.00%Unchanged
CG ONCOLOGY INCCGON
7.1%3.17%$146.1M2.1M$74.6M1.1M+953,800+86.55%Add
EETON PHARMACEUTICALS INC COMETON
3.82%2.27%$78.6M2.2M$53.6M2.2M00.00%Unchanged
CRISPR THERAPEUTICSCRSP
3.68%2.8%$75.8M1.4M$66.1M1.4M00.00%Unchanged
OORIC PHARMACEUTICALS INCORIC
3.54%3.62%$72.9M6.7M$85.2M6.7M00.00%Unchanged
FFIRST TRACKS BIOTHERAPEUTICSTRAX
3.11%$63.9M3.2M$00+3.2MNew Buy
LLAKEFRONT BIOTHERAPEUTICS NVLKFT
2.43%2.12%$50.0M1.7M$50.0M1.7M00.00%Unchanged
NNEUROGENE INC COMNGNE
1.94%1.09%$40.0M1.3M$25.6M1.3M00.00%Unchanged
STOKE THERAPEUTICS INCSTOK
1.17%0.14%$24.0M735,000$3.3M100,000+635,000+635.00%Add
FULCRUM THERAPEUTICS INC COMFULC
1.17%$24.0M6.5M$00+6.5MNew Buy
LLEGEND BIOTECH CORPLEGN
1.12%$23.1M800,000$00+800,000New Buy
BBRIDGEBIO ONCOLOGY THERAPEUTBBOT
1.05%1.07%$21.5M2.8M$25.3M2.8M00.00%Unchanged
MMBX BIOSCIENCES INCMBX
1.04%0.98%$21.4M388,500$23.2M777,000-388,500-50.00%Reduce
ZZENAS BIOPHARMA INCZBIO
0.97%0.66%$20.0M789,500$15.4M789,50000.00%Unchanged
AATARA BIOTHERAPEUTICS INCATRA
0.87%0.02%$17.8M1.6M$471,07599,593+1.5M+1,458.34%Add
RELAY THERAPEUTICS INCRLAY
0.63%0.8%$13.1M697,948$19.0M1.9M-1.2M-63.36%Reduce
AAURA BIOSCIENCES INCAURA
0.58%$11.8M1.7M$00+1.7MNew Buy
OODYSSEY THERAPEUTICS INCODTX
0.51%$10.4M555,555$00+555,555New Buy
EEIKON THERAPEUTICS INCEIKN
0.46%0.33%$9.6M732,606$7.8M732,60600.00%Unchanged
PHARVARIS N VPHVS
0.4%$8.1M235,000$00+235,000New Buy
ZURA BIO LTD CLASS A ORD SHSZURA
0.34%0.3%$7.0M1.2M$7.0M1.2M00.00%Unchanged
PPHATHOM PHARMACEUTICALS INCPHAT
0.33%0.29%$6.8M625,000$6.9M625,00000.00%Unchanged
NURIX THERAPEUTICS INCNRIX
0.32%$6.6M270,000$00+270,000New Buy
EERASCA INCERAS
0.29%0.62%$6.0M330,000$14.6M900,000-570,000-63.33%Reduce
EELOXX PHARMACEUTICALS INCELOX
0.27%$5.6M400,000$00+400,000New Buy
AAARDVARK THERAPEUTICS INC COMAARD
0.12%$2.4M410,894$00+410,894New Buy
HHELIX ACQUISITION CORP IIIHLXC
0.1%0.09%$2.1M200,000$2.0M200,00000.00%Unchanged
MMEREO BIOPHARMA GROUP FUNSPONSORED ADR 1 ADR REPS 5 ORD SHSMREO
0.02%0.19%$317,7001.0M$4.4M13.4M-12.4M-92.52%Reduce
SSURROZEN INCSRZN
<0.01%0.01%$734,444$129,4544,44400.00%Unchanged

🧭 Institutional Sector Flow Heatmap

Net Outflow Net Inflow