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EcoR1 Capital, LLC 13F holdings, Q3 2025

Holdings as of September 30, 2025 · filings on SEC EDGAR · latest filing →

EcoR1 Capital, LLC disclosed 30 US equity positions worth $2.1bn in its Q3 2025 13F filing. The largest position was ZYME at 18.8% of the reported book, followed by ANAB and QURE. Against the Q2 2025 filing, it opened 6 new positions, added to 4 and reduced 3 among the top 30 holdings.

← Q2 2025 · Q4 2025 →

What did EcoR1 Capital, LLC own in Q3 2025? Top 30 positions

#StockSectorWeightValueSharesΔ sharesvs Q2 2025
1 ZYME ZYMEWORKS INC Healthcare 18.8%$392.3m22,970,388 0% held
2 ANAB ANAPTYSBIO INC Healthcare 11.6%$241.3m7,880,094 0% held
3 QURE UNIQURE NV 11.2%$232.8m3,988,971 0% held
4 JAZZ JAZZ PHARMACEUTICALS PLC Healthcare 10.8%$224.9m1,706,469 0% held
5 CRNXGBP CRINETICS PHARMACEUTICALS IN 8.6%$178.6m4,288,120 0% held
6 CRSP CRISPR THERAPEUTICS AG Healthcare 4.3%$90.0m1,389,276 0% held
7 TNGX TANGO THERAPEUTICS INC Healthcare 4.3%$89.3m10,630,736 0% held
8 ORIC ORIC PHARMACEUTICALS INC Healthcare 3.9%$80.7m6,728,116 316% added
9 APLSUSD APELLIS PHARMACEUTICALS INC 3.7%$78.0m3,447,156 -71% reduced
10 XNCR XENCOR INC Healthcare 3.5%$72.1m6,144,767 0% held
11 LKFT GALAPAGOS NV Healthcare 2.8%$57.7m1,667,119 61% added
12 IMNM IMMUNOME INC Healthcare 2.3%$47.8m4,079,415 0% held
13 ETON ETON PHARMACEUTICALS INC 2.1%$44.1m2,030,544 0% held
14 MBX MBX BIOSCIENCES INC Healthcare 1.8%$37.2m2,123,604 85% added
15 MDGL MADRIGAL PHARMACEUTICALS INC Healthcare 1.7%$34.4m75,000 0% held
16 RNAGBP AVIDITY BIOSCIENCES INC 1.6%$33.3m765,000 53% added
17 BBOT BRIDGEBIO ONCOLOGY THERAPEUT 1.6%$32.7m2,823,126 – new
18 NGNE NEUROGENE INC 1.1%$22.0m1,271,342 0% held
19 ALKS ALKERMES PLC Healthcare 0.7%$15.0m500,000 0% held
20 AQST AQUESTIVE THERAPEUTICS INC 0.7%$14.7m2,625,000 – new
21 METSERA INC 0.7%$14.2m271,529 0% held
22 CNTA CENTESSA PHARMACEUTICALS PLC 0.6%$13.3m550,000 – new
23 PRME PRIME MEDICINE INC 0.4%$8.6m1,543,326 – new
24 ATRA ATARA BIOTHERAPEUTICS INC 0.4%$8.2m573,183 0% held
25 KURA KURA ONCOLOGY INC Healthcare 0.4%$7.7m872,500 -79% reduced
26 PEPG PEPGEN INC Healthcare 0.2%$3.7m800,000 – new
27 NUVATION BIO INC 0.2%$3.6m963,333 0% held
28 VYGR VOYAGER THERAPEUTICS INC Healthcare 0.2%$3.1m670,303 -83% reduced
29 CMPS COMPASS PATHWAYS PLC Healthcare 0.1%$1.5m265,137 – new
30 SURROZEN INC 0.0%$859.3k66,665 0% held

Weights are shares of the reported long US equity book (options excluded). Values are as filed, normalised to whole dollars. Share changes compare against the immediately preceding filing only.