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Institutional

EcoR1 Capital, LLC

CIK 0001587114
$2.36B
Reported AUM
29
Positions
Q1 2026
Period
2026-05-15
Filed

The Brief · EcoR1 Capital, LLC · Q1 2026

AI · grounded in 13F

EcoR1 Capital, LLC closed its position in IMNM for a reduction of $61.3M. The fund established a new position in AKTS worth $86.3M and increased its stake in CNTA by 105.8%. Other notable activity includes new positions in RLAY and ERAS, alongside the closure of positions in GPCR and PCVX.

Portfolio · Q1 2026

ZYME$575.2MANAB$437.0MJAZZ$322.6MCNTA$254.6MCRNX$155.7MAKTSORICCGONCRSPETONLKFTOther$169.0MEL

Top holdings

#StockIssuerPriceDay %1Y Gr.5Y Gr.Value% of bookΔ shares (QoQ)Status
1ZYMEZYMEWORKS INC$21.93-3.44%80.67%-31.16%$575.2M24.41%HELD
2ANABANAPTYSBIO INC$53.17-3.39%223.06%211.45%$437.0M18.55%HELD
3JAZZJAZZ PHARMACEUTICALS PLC$253.04-2.07%119.30%92.34%$322.6M13.69%HELD
4CNTACENTESSA PHARMACEUTICALS PLC0.00%$254.6M10.81%HELD
5CRNXCRINETICS PHARMACEUTICALS IN$83.770.17%200.92%255.43%$155.7M6.61%HELD
6AKTSAKTIS ONCOLOGY INC$22.37-2.74%2.68%14.26%$86.3M3.66%HELD
7ORICORIC PHARMACEUTICALS INC$11.17-4.04%15.02%-47.31%$85.2M3.62%HELD
8CGONCG ONCOLOGY INC$70.29-3.75%168.87%58.22%$74.6M3.17%HELD
9CRSPCRISPR THERAPEUTICS AG$48.03-0.85%-13.64%-61.23%$66.1M2.80%HELD
10ETONETON PHARMACEUTICALS INC$46.35-5.46%228.59%781.02%$53.6M2.27%HELD
11LKFTGALAPAGOS NV$27.34-1.09%-16.42%-53.52%$50.0M2.12%HELD
12XNCRXENCOR INC$20.11-6.42%169.30%-36.55%$26.3M1.12%HELD
13NGNENEUROGENE INC$33.20-1.19%52.43%-79.63%$25.6M1.09%HELD
14BBOTBRIDGEBIO ONCOLOGY THERAPEUT$8.15-4.12%-21.89%-21.63%$25.3M1.07%HELD
15MBXMBX BIOSCIENCES INC$65.46-1.50%381.16%188.91%$23.2M0.98%HELD
16RLAYRELAY THERAPEUTICS INC$18.65-4.11%453.27%-41.96%$19.0M0.80%HELD
17ZBIOZENAS BIOPHARMA INC$31.87-1.24%106.00%49.49%$15.4M0.66%HELD
18ERASERASCA INC$17.98-3.77%1243.88%-21.87%$14.6M0.62%HELD
19EIKNEIKON THERAPEUTICS INC$9.29-3.43%-33.66%-9.07%$7.8M0.33%HELD
20REPLREPLIMUNE GROUP INC$10.5494.82%-28.82%-82.97%$7.7M0.32%HELD
21ZURAZURA BIO LTD$5.39-2.80%260.00%-20.70%$7.0M0.30%HELD
22PHATPHATHOM PHARMACEUTICALS INC$8.99-0.44%7.66%-74.74%$6.9M0.29%HELD
23MREOMEREO BIOPHARMA GROUP PLC$0.346.67%-79.76%-87.96%$4.4M0.19%HELD
24STOKSTOKE THERAPEUTICS INC$29.11-3.10%132.69%14.74%$3.3M0.14%HELD
25PRLDPRELUDE THERAPEUTICS INC$4.81-4.75%509.90%-85.85%$3.2M0.14%HELD
26IBIOIBIO INC$1.422.52%110.61%-99.78%$3.0M0.13%HELD
27HLXCHELIX ACQUISITION CORP III USD$10.510.00%2.54%2.14%$2.0M0.09%HELD
28ATRAATARA BIOTHERAPEUTICS INC$8.261.10%-29.26%-97.82%$471K0.02%HELD
29SRZNWSURROZEN INC-30.59%$129K0.01%HELD

Source: SEC EDGAR · accession 0000935836-26-000270. 13F discloses long positions only — shorts, foreign equities, and options are excluded.