Fund Holdings — EcoR1 Capital, LLC

Total Portfolio Value
$2.08B
Total Bought
$210.68M
Total Sold
$394.77M
Net Transaction
-$184.09M
Filing Period:
Securities
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SharesValue ($K)
Q2 2025
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Q3 2025
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Change
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Q2 2025
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Q3 2025
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Weight (%)
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Change
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UNIQURE NV(QURE)3,988,9713,988,971055,606232,83611.17%+177,230
ZYMEWORKS INC(ZYME)22,970,38822,970,3880288,278392,33418.83%+104,056
ANAPTYSBIO INC7,880,0947,880,0940174,938241,28811.58%+66,350
ORIC PHARMACEUTICALS INC(ORIC)1,618,0686,728,116+5,110,04816,42380,7373.87%+64,314
CRINETICS PHARMACEUTICALS IN(CRNX)4,288,1204,288,1200123,326178,6008.57%+55,274
JAZZ PHARMACEUTICALS PLC(JAZZ)1,706,4691,706,4690181,090224,91310.79%+43,822
TANGO THERAPEUTICS INC(TNGX)10,630,73610,630,736054,42989,2984.29%+34,869
BRIDGEBIO ONCOLOGY THERAPEUT(BBOT)02,823,126+2,823,126032,6921.57%+32,692
GALAPAGOS NV(LKFT)1,036,9451,667,119+630,17429,02457,7492.77%+28,725
MBX BIOSCIENCES INC(MBX)1,149,7942,123,604+973,81013,11937,1631.78%+24,044
XENCOR INC(XNCR)6,144,7676,144,767048,29872,0783.46%+23,780
CRISPR THERAPEUTICS AG(CRSP)1,389,2761,389,276067,57490,0394.32%+22,465
AVIDITY BIOSCIENCES INC500,000765,000+265,00014,20033,3311.60%+19,131
ETON PHARMACEUTICALS INC(ETON)2,030,5442,030,544028,93544,1242.12%+15,188
AQUESTIVE THERAPEUTICS INC02,625,000+2,625,000014,6740.70%+14,674
CENTESSA PHARMACEUTICALS PLC0550,000+550,000013,3380.64%+13,338
MADRIGAL PHARMACEUTICALS INC(MDGL)75,00075,000022,69834,4001.65%+11,702
IMMUNOME INC(IMNM)4,079,4154,079,415037,93947,7702.29%+9,831
PRIME MEDICINE INC(PRME)01,543,326+1,543,32608,5500.41%+8,550
METSERA INC271,529271,52907,72514,2090.68%+6,484
ATARA BIOTHERAPEUTICS INC573,183573,18304,4258,2140.39%+3,789
PEPGEN INC(PEPG)0800,000+800,00003,6960.18%+3,696
NEUROGENE INC(NGNE)1,271,3421,271,342019,00722,0321.06%+3,026
NUVATION BIO INC(NUVB)963,333963,33301,8783,5640.17%+1,686
COMPASS PATHWAYS PLC(CMPS)0265,137+265,13701,5190.07%+1,519
ALKERMES PLC(ALKS)500,000500,000014,30515,0000.72%+695
SURROZEN INC(SRZN)66,66566,66505968590.04%+263
MACROGENICS INC(MGNX)1,602,7170-1,602,7171,9390—-1,939
WHITEHAWK THERAPEUTICS INC(WHWK)1,091,4170-1,091,4172,0410—-2,041
HILLEVAX INC2,420,2430-2,420,2434,8160—-4,816
DAY ONE BIOPHARMACEUTICALS I
COM
862,0680-862,0685,6030—-5,603
ADAPTIMMUNE THERAPEUTICS PLC(ADAPY)27,404,0700-27,404,0706,5690—-6,569
REPLIMUNE GROUP INC(REPL)850,3410-850,3417,9000—-7,900
VOYAGER THERAPEUTICS INC(VYGR)3,917,546670,303-3,247,24312,1843,1300.15%-9,053
PACIRA BIOSCIENCES INC(PCRX)457,4710-457,47110,9340—-10,934
KURA ONCOLOGY INC(KURA)4,200,000872,500-3,327,50024,2347,7220.37%-16,512
TECTONIC THERAPEUTIC INC(TECX)935,1210-935,12118,5810—-18,581
VERONA PHARMA PLC200,0000-200,00018,9160—-18,916
AKERO THERAPEUTICS INC440,0000-440,00023,4780—-23,478
JANUX THERAPEUTICS INC(JANX)1,469,8180-1,469,81833,9530—-33,953
ITEOS THERAPEUTICS INC10,688,9780-10,688,978106,5690—-106,569
APELLIS PHARMACEUTICALS INC
COM
11,895,8083,447,156-8,448,652205,91678,0093.74%-127,907
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