Fund Holdings — EcoR1 Capital, LLC

Total Portfolio Value
$2.19B
Total Bought
$205.38M
Total Sold
$555.20M
Net Transaction
-$349.82M
Filing Period:
Securities
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SharesValue ($K)
Q3 2025
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Q4 2025
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Change
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Q3 2025
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Q4 2025
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Weight (%)
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Change
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ZYMEWORKS INC(ZYME)22,970,38822,970,3880392,334604,81027.61%+212,476
ANAPTYSBIO INC7,880,0947,880,0940241,288382,02717.44%+140,738
JAZZ PHARMACEUTICALS PLC(JAZZ)1,706,4691,706,4690224,913290,10013.24%+65,187
CENTESSA PHARMACEUTICALS PLC550,0003,115,000+2,565,00013,33877,9063.56%+64,569
CG ONCOLOGY INC(CGON)0772,000+772,000032,0531.46%+32,053
MBX BIOSCIENCES INC(MBX)2,123,6042,123,604037,16366,9783.06%+29,815
ZENAS BIOPHARMA INC(ZBIO)0789,500+789,500028,6671.31%+28,667
STRUCTURE THERAPEUTICS INC0334,380+334,380023,2561.06%+23,256
CRINETICS PHARMACEUTICALS IN(CRNX)4,288,1204,288,1200178,600199,6129.11%+21,012
VAXCYTE INC(PCVX)0450,000+450,000020,7630.95%+20,763
IMMUNOME INC(IMNM)4,079,4152,855,590-1,223,82547,77061,3382.80%+13,568
VOYAGER THERAPEUTICS INC(VYGR)670,3034,002,847+3,332,5443,13015,7310.72%+12,601
MANNKIND CORP(MNKD)01,660,000+1,660,00009,4120.43%+9,412
NUVATION BIO INC(NUVB)963,333963,33303,5648,6310.39%+5,067
EVOLUS INC(EOLS)0675,000+675,00004,4890.20%+4,489
IBIO INC(IBIO)02,228,000+2,228,00004,3000.20%+4,300
NEUROGENE INC(NGNE)1,271,3421,271,342022,03226,1901.20%+4,157
MEREO BIOPHARMA GROUP PLC(MREO)07,856,466+7,856,46603,2740.15%+3,274
BRIDGEBIO ONCOLOGY THERAPEUT(BBOT)2,823,1262,823,126032,69235,3461.61%+2,654
AQUESTIVE THERAPEUTICS INC2,625,0002,625,000014,67416,9580.77%+2,284
ATARA BIOTHERAPEUTICS INC573,183573,18308,21410,3690.47%+2,155
CAMP4 THERAPEUTICS CORP(CAMP)0325,000+325,00001,9920.09%+1,992
SURROZEN INC(SRZN)66,6654,444-62,2218591000.00%-759
COMPASS PATHWAYS PLC(CMPS)265,1370-265,1371,5190—-1,519
GALAPAGOS NV(LKFT)1,667,1191,667,119057,74954,5152.49%-3,234
PEPGEN INC(PEPG)800,0000-800,0003,6960—-3,696
KURA ONCOLOGY INC(KURA)872,5000-872,5007,7220—-7,722
PRIME MEDICINE INC(PRME)1,543,3260-1,543,3268,5500—-8,550
ETON PHARMACEUTICALS INC(ETON)2,030,5442,030,544044,12434,3361.57%-9,787
METSERA INC271,5290-271,52914,2090—-14,209
ALKERMES PLC(ALKS)500,0000-500,00015,0000—-15,000
CRISPR THERAPEUTICS AG(CRSP)1,389,2761,389,276090,03972,8543.33%-17,185
XENCOR INC(XNCR)6,144,7673,251,112-2,893,65572,07849,7752.27%-22,304
ORIC PHARMACEUTICALS INC(ORIC)6,728,1166,728,116080,73755,0362.51%-25,701
AVIDITY BIOSCIENCES INC765,0000-765,00033,3310—-33,331
MADRIGAL PHARMACEUTICALS INC(MDGL)75,0000-75,00034,4000—-34,399
APELLIS PHARMACEUTICALS INC
COM
3,447,1560-3,447,15678,0090—-78,009
TANGO THERAPEUTICS INC(TNGX)10,630,7360-10,630,73689,2980—-89,298
UNIQURE NV(QURE)3,988,9710-3,988,971232,8360—-232,836
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EcoR1 Capital, LLC — 13F Holdings — Q4 2025 | TickerTrail