Fund Holdings — Rock Springs Capital Management LP

Total Portfolio Value:
$1.71B
Total Bought:
$165.92M
Total Sold:
$257.88M
Net Transaction:
-$91.96M
Notable People:
Rock Springs Capital Llc
Securities
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SharesValue
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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argenx SEADR(ARGX)175,750142,750-33,000$96.88M$105.29M6.15%+$8.41M
Eli Lilly and Company(LLY)116,500105,400-11,100$90.82M$80.42M4.70%-$10.40M
Rhythm Pharmaceuticals, Inc.(RYTM)861,153717,102-144,051$54.42M$72.42M4.23%+$18.00M
Madrigal Pharmaceuticals, Inc.(MDGL)140,296137,746-2,550$42.46M$63.18M3.69%+$20.72M
Revolution Medicines, Inc.(RVMD)1,330,9601,335,270+4,310$48.97M$62.36M3.65%+$13.39M
Merus N V1,063,608597,051-466,557$55.95M$56.21M3.29%+$266.6K
Mirum Pharmaceuticals, Inc.(MIRM)818,206761,126-57,080$41.64M$55.80M3.26%+$14.16M
Insmed Incorporated(INSM)525,000385,000-140,000$52.84M$55.44M3.24%+$2.61M
Travere Therapeutics, Inc.(TVTX)1,908,2082,164,773+256,565$28.24M$51.74M3.02%+$23.50M
Ascendis Pharma A/SADR(ASND)217,000214,500-2,500$37.45M$42.64M2.49%+$5.19M
iRhythm Holdings, Inc.(IRTC)242,500235,000-7,500$37.34M$40.42M2.36%+$3.08M
Agios Pharmaceuticals, Inc.(AGIO)989,745958,542-31,203$32.92M$38.48M2.25%+$5.56M
Ultragenyx Pharmaceutical Inc.(RARE)1,391,0721,246,341-144,731$50.58M$37.49M2.19%-$13.09M
Intuitive Surgical, Inc.(ISRG)82,00082,0000$44.56M$36.67M2.14%-$7.89M
Boston Scientific Corporation(BSX)355,000360,250+5,250$38.13M$35.17M2.06%-$2.96M
Xenon Pharmaceuticals Inc.(XENE)931,681851,744-79,937$29.16M$34.20M2.00%+$5.04M
Alnylam Pharmaceuticals, Inc.(ALNY)100,00074,250-25,750$32.61M$33.86M1.98%+$1.25M
Endeavour Silver Corp.(EXK)572,000593,500+21,500$30.40M$32.47M1.90%+$2.07M
Penumbra, Inc.(PEN)128,500120,500-8,000$32.98M$30.53M1.78%-$2.45M
Akero Therapeutics Inc640,526626,526-14,000$34.18M$29.75M1.74%-$4.43M
Scholar Rock Holding Corporation(SRRK)794,133794,1330$28.13M$29.57M1.73%+$1.45M
Zai Lab LimitedADR(ZLAB)871,392791,193-80,199$30.47M$26.81M1.57%-$3.66M
Structure Therapeutics IncADS1,135,879951,154-184,725$23.56M$26.63M1.56%+$3.07M
Kymera Therapeutics, Inc.(KYMR)450,374450,3740$19.65M$25.49M1.49%+$5.84M
Tenet Healthcare Corporation(THC)130,000125,000-5,000$22.88M$25.38M1.48%+$2.50M
Evolent Health, Inc.CL A(EVH)2,820,7002,950,000+129,300$31.76M$24.96M1.46%-$6.80M
Caris Life Sciences, Inc.(CAI)793,651793,6510$21.21M$24.01M1.40%+$2.80M
Cidara Therapeutics Inc134,133249,402+115,269$6.53M$23.88M1.40%+$17.35M
DexCom, Inc.(DXCM)286,750316,900+30,150$25.03M$21.32M1.25%-$3.71M
Omada Health, Inc.(OMDA)919,951919,950-1$16.84M$20.34M1.19%+$3.50M
Celldex Therapeutics, Inc.(CLDX)812,653721,538-91,115$16.54M$18.67M1.09%+$2.13M
Vera Therapeutics, Inc.CL A(VERA)617,396617,3960$14.55M$17.94M1.05%+$3.40M
Phreesia, Inc.(PHR)837,300749,116-88,184$23.83M$17.62M1.03%-$6.21M
Tarsus Pharmaceuticals, Inc.(TARS)373,750288,344-85,406$15.14M$17.14M1.00%+$2.00M
Newamsterdam Pharma Company
ORDINARY SHARES
536,111595,929+59,818$9.71M$16.95M0.99%+$7.24M
Compass Therapeutics, Inc.(CMPX)4,962,9554,474,702-488,253$12.90M$15.66M0.92%+$2.76M
Pharvaris N V
COM
623,402623,4020$10.97M$15.55M0.91%+$4.58M
Azenta, Inc.(AZTA)530,400540,400+10,000$16.33M$15.52M0.91%-$805.4K
Mineralys Therapeutics, Inc.(MLYS)324,513408,313+83,800$4.39M$15.48M0.91%+$11.09M
Amicus Therapeutics Inc
COM
1,960,3341,947,374-12,960$11.23M$15.35M0.90%+$4.11M
Spdr Series TrustS P BIOTECH
ST STR SP BIOT
151,750151,7500$12.58M$15.21M0.89%+$2.62M
Arcellx Inc
COMMON STOCK
186,314178,982-7,332$12.27M$14.69M0.86%+$2.43M
Summit Therapeutics Inc.(SMMT)710,000710,0000$15.11M$14.67M0.86%-$440.2K
Cogent Biosciences, Inc.(COGT)800,1991,008,308+208,109$5.75M$14.48M0.85%+$8.73M
Enliven Therapeutics Inc701,408686,107-15,301$14.07M$14.04M0.82%-$25.6K
Zenas BioPharma, Inc.(ZBIO)640,467580,677-59,790$6.21M$12.89M0.75%+$6.68M
Neurocrine Biosciences, Inc.(NBIX)88,80089,750+950$11.16M$12.60M0.74%+$1.44M
Ardelyx Inc2,286,2732,286,2730$8.96M$12.60M0.74%+$3.64M
Danaher Corporation(DHR)59,00061,500+2,500$11.65M$12.19M0.71%+$538.1K
LENZ Therapeutics, Inc.(LENZ)83,982236,227+152,245$2.46M$11.00M0.64%+$8.54M
Soleno Therapeutics Inc154,528154,5280$12.95M$10.45M0.61%-$2.50M
Dyne Therapeutics, Inc.(DYN)580,998824,061+243,063$5.53M$10.42M0.61%+$4.89M
Mereo BioPharma Group plcADS(MREO)4,465,2924,570,649+105,357$12.10M$9.42M0.55%-$2.69M
Aclaris Therapeutics, Inc.(ACRS)4,769,3094,609,309-160,000$6.77M$8.76M0.51%+$1.99M
Gossamer Bio, Inc.(GOSS)3,266,9603,266,9600$4.02M$8.59M0.50%+$4.57M
Heartflow, Inc.(HTFL)0250,000+250,000$0$8.41M0.49%+$8.41M
Inspire Medical Systems, Inc.(INSP)107,500110,500+3,000$13.95M$8.20M0.48%-$5.75M
agilon health, inc.(AGL)6,550,4006,966,300+415,900$15.07M$7.18M0.42%-$7.89M
Edwards Lifesciences Corp131,00088,000-43,000$10.25M$6.84M0.40%-$3.40M
Amylyx Pharmaceuticals, Inc.(AMLX)499,764499,7640$3.20M$6.79M0.40%+$3.59M
Gossamer Bio, Inc.NOTE 5 000 6 0(GOSS)000$4.95M$6.72M0.39%+$1.77M
Regeneron Pharmaceuticals, Inc.(REGN)11,30011,3000$5.93M$6.35M0.37%+$421.2K
Bicara Therapeutics Inc336,070370,666+34,596$3.12M$5.85M0.34%+$2.73M
Janux Therapeutics, Inc.(JANX)210,266210,366+100$4.86M$5.14M0.30%+$284.2K
MBX Biosciences, Inc.(MBX)0282,624+282,624$0$4.95M0.29%+$4.95M
Thermo Fisher Scientific Inc.(TMO)10,00010,0000$4.05M$4.85M0.28%+$795.6K
BridgeBio Pharma, Inc.(BBIO)085,000+85,000$0$4.41M0.26%+$4.41M
Alphatec Holdings, Inc.(ATEC)267,500302,500+35,000$2.97M$4.40M0.26%+$1.43M
Acadia Healthcare Company, Inc.(ACHC)696,000170,000-526,000$15.79M$4.21M0.25%-$11.58M
Ocular Therapeutix, Inc.(OCUL)0300,000+300,000$0$3.51M0.21%+$3.51M
Talphera, Inc.(TLPH)316,4603,589,186+3,272,726$145.6K$3.21M0.19%+$3.06M
Alkermes plcSHS(ALKS)0106,537+106,537$0$3.20M0.19%+$3.20M
Sionna Therapeutics, Inc.(SION)99,42999,4290$1.73M$2.92M0.17%+$1.20M
EDAP TMS S.A.ADR(FOCL)1,270,0001,270,0000$2.10M$2.91M0.17%+$812.8K
Jasper Therapeutics, Inc.(JSPR)545,1711,100,726+555,555$3.03M$2.62M0.15%-$406.0K
West Pharmaceutical Services, Inc.(WST)51,0309,750-41,280$11.17M$2.56M0.15%-$8.61M
Apellis Pharmaceuticals Inc
COM
84,30092,000+7,700$1.46M$2.08M0.12%+$622.7K
Neurogene Inc.(NGNE)104,339104,3390$1.56M$1.81M0.11%+$248.3K
Korro Bio, Inc.(KRRO)35,71935,7190$446.1K$1.71M0.10%+$1.26M
Centessa Pharmaceuticals PlcADS069,240+69,240$0$1.68M0.10%+$1.68M
Perspective Therapeutics, Inc.(CATX)444,383444,3830$1.53M$1.52M0.09%-$4.4K
Applied Therapeutics Inc2,075,9912,075,9910$645.8K$1.26M0.07%+$609.9K
Mersana Therapeutics Inc0152,586+152,586$0$1.18M0.07%+$1.18M
Immunovant, Inc.(IMVT)221,50072,965-148,535$3.54M$1.18M0.07%-$2.37M
EyePoint, Inc.(EYPT)031,655+31,655$0$450.8K0.03%+$450.8K
Charles River Laboratories International, Inc.(CRL)2,7002,7000$409.7K$422.4K0.02%+$12.8K
Vaxcyte, Inc.(PCVX)11,10011,1000$360.9K$399.8K0.02%+$39.0K
Novavax, Inc.(NVAX)53,90045,000-8,900$339.6K$390.1K0.02%+$50.6K
Prothena Corp PlcSHS
SHS
492,60125,398-467,203$2.99M$247.9K0.01%-$2.74M
MoonLake ImmunotherapeuticsCL A(MLTX)028,200+28,200$0$202.2K0.01%+$202.2K
Nuvation Bio Inc.W EXP 02 10 202(NUVB)134,028134,0280$36.2K$27.1K0.00%-$9.1K
Compugen Ltd.(CGEN)989,99013,430-976,560$1.76M$19.7K0.00%-$1.74M
89bio Inc40,0000-40,000$392.8K$0—-$392.8K
Adaptimmune Therapeutics plcADS(ADAPY)2,483,4680-2,483,468$595.3K$0—-$595.3K
Blueprint Medicines Corp185,5000-185,500$23.78M$0—-$23.78M
Cullinan Therapeutics, Inc.(CGEM)668,2330-668,233$5.03M$0—-$5.03M
Mersana Therapeutics Inc3,814,6840-3,814,684$1.13M$0—-$1.13M
Nuvalent Inc93,3280-93,328$7.12M$0—-$7.12M
Oscar Health, Inc.CL A(OSCR)700,0000-700,000$15.01M$0—-$15.01M
Pulmonx Corporation(LUNG)651,1000-651,100$1.69M$0—-$1.69M
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Rock Springs Capital Management LP — 13F Holdings — Q3 2025 | TickerTrail