Fund Holdings — EcoR1 Capital, LLC

Total Portfolio Value
$2.02B
Total Bought
$225.41M
Total Sold
$777.15M
Net Transaction
-$551.74M
Filing Period:
Securities
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SharesValue ($K)
Q1 2026
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Q2 2026
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Change
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Q1 2026
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Q2 2026
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Weight (%)
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Change
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ANAPTYSBIO INC7,880,0947,880,0940437,030531,90626.37%+94,876
AKTIS ONCOLOGY INC(AKTS)4,824,4694,824,469086,310155,4937.71%+69,183
FIRST TRACKS BIOTHERAPEUTICS03,174,519+3,174,519063,8713.17%+63,871
CG ONCOLOGY INC(CGON)1,102,0001,494,300+392,30074,583106,1705.26%+31,587
ZYMEWORKS INC(ZYME)22,970,38822,970,3880575,179600,44629.77%+25,267
ETON PHARMACEUTICALS INC(ETON)2,171,9382,171,938053,60378,6243.90%+25,021
FULCRUM THERAPEUTICS INC(FULC)06,549,866+6,549,866023,9731.19%+23,973
LEGEND BIOTECH CORP(LEGN)0800,000+800,000023,1041.15%+23,104
STOKE THERAPEUTICS INC(STOK)100,000735,000+635,0003,25624,0491.19%+20,793
ATARA BIOTHERAPEUTICS INC99,5931,552,000+1,452,40747117,8170.88%+17,346
NEUROGENE INC(NGNE)1,271,3421,271,342025,63039,9841.98%+14,353
AURA BIOSCIENCES INC(AURA)01,666,667+1,666,667011,8330.59%+11,833
ODYSSEY THERAPEUTICS INC0555,555+555,555010,3940.52%+10,394
CRISPR THERAPEUTICS AG(CRSP)1,389,2761,389,276066,08875,7713.76%+9,683
PHARVARIS N V
COM
0235,000+235,00008,1260.40%+8,126
NURIX THERAPEUTICS INC(NRIX)0270,000+270,00006,5500.32%+6,550
ELOXX PHARMACEUTICALS INC0400,000+400,00005,5520.28%+5,552
ZENAS BIOPHARMA INC(ZBIO)789,500789,500015,43520,0380.99%+4,603
AARDVARK THERAPEUTICS INC0396,194+396,19402,2820.11%+2,282
EIKON THERAPEUTICS INC(EIKN)732,606732,60607,7519,5610.47%+1,810
HELIX ACQUISITION CORP III USD(HLXC)200,000200,00002,0322,1280.11%+96
SURROZEN INC(SRZN)4,4444,44401291150.01%-14
LAKEFRONT BIOTHERAPEUTICS NV(LKFT)1,667,1191,667,119050,01449,9802.48%-33
ZURA BIO LTD(ZURA)1,179,7151,179,71507,0196,9600.35%-59
PHATHOM PHARMACEUTICALS INC(PHAT)625,000625,00006,9446,7810.34%-162
MBX BIOSCIENCES INC(MBX)777,000388,500-388,50023,19321,4451.06%-1,748
IBIO INC(IBIO)1,583,0000-1,583,0003,0080—-3,008
PRELUDE THERAPEUTICS INC(PRLD)947,0490-947,0493,2390—-3,239
BRIDGEBIO ONCOLOGY THERAPEUT(BBOT)2,823,1262,823,126025,26721,5121.07%-3,755
MEREO BIOPHARMA GROUP PLC(MREO)13,368,8551,000,000-12,368,8554,4123180.02%-4,094
RELAY THERAPEUTICS INC(RLAY)1,904,762697,948-1,206,81418,95213,0590.65%-5,894
REPLIMUNE GROUP INC(REPL)1,000,0000-1,000,0007,6500—-7,650
ERASCA INC(ERAS)900,000330,000-570,00014,5626,0460.30%-8,516
ORIC PHARMACEUTICALS INC(ORIC)6,728,1166,728,116085,24572,8653.61%-12,380
XENCOR INC(XNCR)2,183,0000-2,183,00026,3270—-26,327
CRINETICS PHARMACEUTICALS IN(CRNX)4,288,1200-4,288,120155,7450—-155,745
CENTESSA PHARMACEUTICALS PLC6,000,0000-6,000,000238,3200—-238,320
JAZZ PHARMACEUTICALS PLC(JAZZ)1,706,4690-1,706,469322,6080—-322,608
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EcoR1 Capital, LLC — 13F Holdings — Q2 2026 | TickerTrail