Fund Holdings — Rock Springs Capital Management LP

Total Portfolio Value:
$1.60B
Total Bought:
$222.41M
Total Sold:
$360.06M
Net Transaction:
-$137.65M
Notable People:
Rock Springs Capital Llc
Securities
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SharesValue
Q1 2025
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Q2 2025
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Change
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Q1 2025
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Q2 2025
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Weight (%)
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Change
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argenx SEADR(ARGX)175,750175,7500$104.02M$96.88M6.04%-$7.14M
Eli Lilly and Company(LLY)113,500116,500+3,000$93.74M$90.82M5.66%-$2.93M
Merus N V980,7511,063,608+82,857$41.28M$55.95M3.49%+$14.67M
Rhythm Pharmaceuticals, Inc.(RYTM)834,188861,153+26,965$44.19M$54.42M3.39%+$10.23M
Insmed Incorporated(INSM)515,900525,000+9,100$39.36M$52.84M3.29%+$13.48M
Ultragenyx Pharmaceutical Inc.(RARE)1,394,4341,391,072-3,362$50.49M$50.58M3.15%+$86.9K
Revolution Medicines, Inc.(RVMD)1,281,6401,330,960+49,320$45.32M$48.97M3.05%+$3.65M
Intuitive Surgical, Inc.(ISRG)102,00082,000-20,000$50.52M$44.56M2.78%-$5.96M
Madrigal Pharmaceuticals, Inc.(MDGL)166,698140,296-26,402$55.22M$42.46M2.65%-$12.76M
Mirum Pharmaceuticals, Inc.(MIRM)951,765818,206-133,559$42.88M$41.64M2.59%-$1.24M
Boston Scientific Corporation(BSX)277,000355,000+78,000$27.94M$38.13M2.38%+$10.19M
Ascendis Pharma A/SADR(ASND)216,000217,000+1,000$33.67M$37.45M2.33%+$3.79M
iRhythm Holdings, Inc.(IRTC)254,300242,500-11,800$26.62M$37.34M2.33%+$10.72M
Akero Therapeutics Inc672,759640,526-32,233$27.23M$34.18M2.13%+$6.95M
Penumbra, Inc.(PEN)171,000128,500-42,500$45.73M$32.98M2.05%-$12.75M
Agios Pharmaceuticals, Inc.(AGIO)342,180989,745+647,565$10.03M$32.92M2.05%+$22.89M
Alnylam Pharmaceuticals, Inc.(ALNY)143,250100,000-43,250$38.68M$32.61M2.03%-$6.07M
Evolent Health, Inc.CL A(EVH)2,695,7002,820,700+125,000$25.53M$31.76M1.98%+$6.23M
Zai Lab LimitedADR(ZLAB)904,592871,392-33,200$32.69M$30.47M1.90%-$2.22M
Endeavour Silver Corp.(EXK)480,000572,000+92,000$20.78M$30.40M1.89%+$9.62M
Xenon Pharmaceuticals Inc.(XENE)931,681931,6810$31.26M$29.16M1.82%-$2.10M
Travere Therapeutics, Inc.(TVTX)2,921,1961,908,208-1,012,988$52.35M$28.24M1.76%-$24.11M
Scholar Rock Holding Corporation(SRRK)761,541794,133+32,592$24.48M$28.13M1.75%+$3.64M
DexCom, Inc.(DXCM)397,650286,750-110,900$27.16M$25.03M1.56%-$2.13M
Phreesia, Inc.(PHR)1,148,336837,300-311,036$29.35M$23.83M1.48%-$5.52M
Blueprint Medicines Corp1,007,569185,500-822,069$89.18M$23.78M1.48%-$65.40M
Structure Therapeutics IncADS1,132,9791,135,879+2,900$19.61M$23.56M1.47%+$3.95M
Tenet Healthcare Corporation(THC)130,000130,0000$17.48M$22.88M1.43%+$5.39M
Caris Life Sciences, Inc.(CAI)0793,651+793,651$0$21.21M1.32%+$21.21M
Kymera Therapeutics, Inc.(KYMR)794,437450,374-344,063$21.74M$19.65M1.22%-$2.09M
Omada Health, Inc.(OMDA)0919,951+919,951$0$16.84M1.05%+$16.84M
Celldex Therapeutics, Inc.(CLDX)812,653812,6530$14.75M$16.54M1.03%+$1.79M
Azenta, Inc.(AZTA)475,000530,400+55,400$16.45M$16.33M1.02%-$128.3K
Acadia Healthcare Company, Inc.(ACHC)681,100696,000+14,900$20.65M$15.79M0.98%-$4.86M
UnitedHealth Group Incorporated(UNH)100,50050,500-50,000$52.64M$15.75M0.98%-$36.88M
Tarsus Pharmaceuticals, Inc.(TARS)354,376373,750+19,374$18.20M$15.14M0.94%-$3.06M
Summit Therapeutics Inc.(SMMT)995,000710,000-285,000$19.19M$15.11M0.94%-$4.08M
agilon health, inc.(AGL)6,950,0006,550,400-399,600$30.09M$15.07M0.94%-$15.03M
Oscar Health, Inc.CL A(OSCR)1,050,000700,000-350,000$13.77M$15.01M0.94%+$1.24M
Vera Therapeutics, Inc.CL A(VERA)520,796617,396+96,600$12.51M$14.55M0.91%+$2.04M
Enliven Therapeutics Inc465,871701,408+235,537$9.17M$14.07M0.88%+$4.90M
Inspire Medical Systems, Inc.(INSP)99,250107,500+8,250$15.81M$13.95M0.87%-$1.86M
Soleno Therapeutics Inc124,095154,528+30,433$8.87M$12.95M0.81%+$4.08M
Compass Therapeutics, Inc.(CMPX)4,962,9554,962,9550$9.43M$12.90M0.80%+$3.47M
Spdr Series TrustS P BIOTECH
ST STR SP BIOT
0151,750+151,750$0$12.58M0.78%+$12.58M
Arcellx Inc
COMMON STOCK
0186,314+186,314$0$12.27M0.76%+$12.27M
Mereo BioPharma Group plcADS(MREO)6,684,2474,465,292-2,218,955$15.04M$12.10M0.75%-$2.94M
Danaher Corporation(DHR)58,80059,000+200$12.05M$11.65M0.73%-$399.1K
Amicus Therapeutics Inc
COM
1,909,3621,960,334+50,972$15.58M$11.23M0.70%-$4.35M
West Pharmaceutical Services, Inc.(WST)60,25051,030-9,220$13.49M$11.17M0.70%-$2.32M
Neurocrine Biosciences, Inc.(NBIX)279,00088,800-190,200$30.86M$11.16M0.70%-$19.70M
Pharvaris N V
COM
623,402623,4020$9.79M$10.97M0.68%+$1.18M
Edwards Lifesciences Corp255,000131,000-124,000$18.48M$10.25M0.64%-$8.24M
Newamsterdam Pharma Company
ORDINARY SHARES
536,111536,1110$10.97M$9.71M0.60%-$1.27M
Ardelyx Inc1,604,9752,286,273+681,298$7.88M$8.96M0.56%+$1.08M
Nuvalent Inc427,53293,328-334,204$30.32M$7.12M0.44%-$23.20M
Aclaris Therapeutics, Inc.(ACRS)5,046,3094,769,309-277,000$7.72M$6.77M0.42%-$948.4K
Cidara Therapeutics Inc0134,133+134,133$0$6.53M0.41%+$6.53M
Zenas BioPharma, Inc.(ZBIO)878,667640,467-238,200$6.94M$6.21M0.39%-$735.3K
Regeneron Pharmaceuticals, Inc.(REGN)2,80011,300+8,500$1.78M$5.93M0.37%+$4.16M
Cogent Biosciences, Inc.(COGT)0800,199+800,199$0$5.75M0.36%+$5.75M
Dyne Therapeutics, Inc.(DYN)524,499580,998+56,499$5.49M$5.53M0.34%+$44.8K
Cullinan Therapeutics, Inc.(CGEM)644,633668,233+23,600$4.88M$5.03M0.31%+$151.9K
Gossamer Bio, Inc.NOTE 5 000 6 0(GOSS)000$5.26M$4.95M0.31%-$308.3K
Janux Therapeutics, Inc.(JANX)204,466210,266+5,800$5.52M$4.86M0.30%-$663.4K
Mineralys Therapeutics, Inc.(MLYS)320,813324,513+3,700$5.09M$4.39M0.27%-$703.8K
Thermo Fisher Scientific Inc.(TMO)010,000+10,000$0$4.05M0.25%+$4.05M
Gossamer Bio, Inc.(GOSS)3,266,9603,266,9600$3.59M$4.02M0.25%+$424.7K
Immunovant, Inc.(IMVT)975,803221,500-754,303$16.68M$3.54M0.22%-$13.13M
Amylyx Pharmaceuticals, Inc.(AMLX)343,228499,764+156,536$1.22M$3.20M0.20%+$1.99M
Bicara Therapeutics Inc336,070336,0700$4.38M$3.12M0.19%-$1.26M
Jasper Therapeutics, Inc.(JSPR)545,171545,1710$2.34M$3.03M0.19%+$681.5K
Prothena Corp PlcSHS
SHS
492,601492,6010$6.10M$2.99M0.19%-$3.11M
Alphatec Holdings, Inc.(ATEC)267,500267,5000$2.71M$2.97M0.19%+$256.8K
LENZ Therapeutics, Inc.(LENZ)83,08283,982+900$2.14M$2.46M0.15%+$325.5K
EDAP TMS S.A.ADR(FOCL)1,270,0001,270,0000$2.49M$2.10M0.13%-$393.7K
Compugen Ltd.(CGEN)989,990989,9900$1.45M$1.76M0.11%+$316.8K
Sionna Therapeutics, Inc.(SION)99,42999,4290$1.04M$1.73M0.11%+$685.1K
Pulmonx Corporation(LUNG)503,700651,100+147,400$3.39M$1.69M0.11%-$1.70M
Neurogene Inc.(NGNE)104,339104,3390$1.22M$1.56M0.10%+$338.1K
Perspective Therapeutics, Inc.(CATX)444,383444,3830$946.5K$1.53M0.10%+$582.1K
Apellis Pharmaceuticals Inc
COM
80,00084,300+4,300$1.75M$1.46M0.09%-$290.4K
Sarepta Therapeutics, Inc.(SRPT)159,30068,600-90,700$10.17M$1.17M0.07%-$8.99M
Mersana Therapeutics Inc3,814,6843,814,6840$1.31M$1.13M0.07%-$183.9K
Applied Therapeutics Inc2,074,8912,075,991+1,100$1.01M$645.8K0.04%-$368.6K
Adaptimmune Therapeutics plcADS(ADAPY)2,483,4682,483,4680$489.2K$595.3K0.04%+$106.0K
Korro Bio, Inc.(KRRO)35,71935,7190$621.9K$446.1K0.03%-$175.7K
Charles River Laboratories International, Inc.(CRL)02,700+2,700$0$409.7K0.03%+$409.7K
89bio Inc844,44140,000-804,441$6.14M$392.8K0.02%-$5.75M
Vaxcyte, Inc.(PCVX)011,100+11,100$0$360.9K0.02%+$360.9K
Novavax, Inc.(NVAX)650,00053,900-596,100$4.17M$339.6K0.02%-$3.83M
Talphera, Inc.(TLPH)316,460316,4600$156.6K$145.6K0.01%-$11.0K
Nuvation Bio Inc.W EXP 02 10 202(NUVB)134,028134,0280$32.0K$36.2K0.00%+$4.2K
Beam Therapeutics Inc.(BEAM)150,0200-150,020$2.93M$0—-$2.93M
BioCryst Pharmaceuticals, Inc.(BCRX)222,0110-222,011$1.67M$0—-$1.67M
Inozyme Pharma Inc3,445,2990-3,445,299$3.14M$0—-$3.14M
Kestra Med Technologies LtdSHS
SHS
145,0000-145,000$3.61M$0—-$3.61M
Legend Biotech CorporationADS(LEGN)512,9320-512,932$17.40M$0—-$17.40M
MacroGenics, Inc.(MGNX)1,145,2140-1,145,214$1.45M$0—-$1.45M
Nevro Corp800,4940-800,494$4.67M$0—-$4.67M
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Rock Springs Capital Management LP — 13F Holdings — Q2 2025 | TickerTrail