Fund HoldingsRock Springs Capital Management LP

Total Portfolio Value
$1.60B
Total Bought
$223.00M
Total Sold
$360.55M
Net Transaction
-$137.55M
Filing Period:
Securities
SharesValue ($K)
Q1 2025
Q2 2025
Change
Q1 2025
Q2 2025
Weight (%)
Change
AGIOS PHARMACEUTICALS INC(AGIO)342,180989,745+647,56510,02632,9192.05%+22,893
CARIS LIFE SCIENCES INC(CAI)0793,651+793,651021,2061.32%+21,206
OMADA HEALTH INC(OMDA)0919,951+919,951016,8351.05%+16,835
MERUS N V980,7511,063,608+82,85741,28055,9463.49%+14,666
INSMED INC(INSM)515,900525,000+9,10039,35852,8363.29%+13,478
SPDR SERIES TRUST
ST STR SP BIOT
0151,750+151,750012,5850.78%+12,585
ARCELLX INC
COMMON STOCK
0186,314+186,314012,2690.76%+12,269
IRHYTHM TECHNOLOGIES INC(IRTC)254,300242,500-11,80026,62037,3352.33%+10,715
RHYTHM PHARMACEUTICALS INC(RYTM)834,188861,153+26,96544,18754,4163.39%+10,229
BOSTON SCIENTIFIC CORP(BSX)277,000355,000+78,00027,94438,1312.38%+10,187
EXACT SCIENCES CORP(EXK)480,000572,000+92,00020,77930,3961.89%+9,617
AKERO THERAPEUTICS INC672,759640,526-32,23327,23334,1782.13%+6,945
CIDARA THERAPEUTICS INC0134,133+134,13306,5340.41%+6,534
EVOLENT HEALTH INC2,695,7002,820,700+125,00025,52831,7611.98%+6,233
COGENT BIOSCIENCES INC(COGT)0800,199+800,19905,7450.36%+5,745
TENET HEALTHCARE CORP(THC)130,000130,000017,48522,8801.43%+5,395
ENLIVEN THERAPEUTICS INC465,871701,408+235,5379,16814,0700.88%+4,902
REGENERON PHARMACEUTICALS(REGN)2,80011,300+8,5001,7765,9330.37%+4,157
SOLENO THERAPEUTICS INC124,095154,528+30,4338,86712,9460.81%+4,080
THERMO FISHER SCIENTIFIC INC(TMO)010,000+10,00004,0550.25%+4,055
STRUCTURE THERAPEUTICS INC1,132,9791,135,879+2,90019,61223,5581.47%+3,946
ASCENDIS PHARMA A/S(ASND)216,000217,000+1,00033,66637,4542.33%+3,788
REVOLUTION MEDICINES INC(RVMD)1,281,6401,330,960+49,32045,31948,9663.05%+3,647
SCHOLAR ROCK HLDG CORP(SRRK)761,541794,133+32,59224,48428,1281.75%+3,645
COMPASS THERAPEUTICS INC4,962,9554,962,95509,43012,9040.80%+3,474
VERA THERAPEUTICS INC(VERA)520,796617,396+96,60012,51014,5460.91%+2,036
AMYLYX PHARMACEUTICALS INC(AMLX)343,228499,764+156,5361,2153,2030.20%+1,988
CELLDEX THERAPEUTICS INC NEW(CLDX)812,653812,653014,75016,5371.03%+1,788
OSCAR HEALTH INC(OSCR)1,050,000700,000-350,00013,76615,0080.94%+1,243
PHARVARIS N V
COM
623,402623,40209,78710,9720.68%+1,184
ARDELYX INC1,604,9752,286,273+681,2987,8808,9620.56%+1,082
SIONNA THERAPEUTICS INC99,42999,42901,0401,7250.11%+685
JASPER THERAPEUTICS INC545,171545,17102,3443,0260.19%+681
ADAPTIMMUNE THERAPEUTICS PLC02,483,468+2,483,46805950.04%+595
PERSPECTIVE THERAPEUTICS INC444,383444,38309471,5290.10%+582
GOSSAMER BIO INC3,266,9603,266,96003,5944,0180.25%+425
CHARLES RIV LABS INTL INC(CRL)02,700+2,70004100.03%+410
VAXCYTE INC(PCVX)011,100+11,10003610.02%+361
NEUROGENE INC104,339104,33901,2221,5600.10%+338
LENZ THERAPEUTICS INC83,08283,982+9002,1362,4620.15%+325
COMPUGEN LTD989,990989,99001,4451,7620.11%+317
ALPHATEC HLDGS INC(ATEC)267,500267,50002,7122,9690.19%+257
CULLINAN THERAPEUTICS INC(CGEM)644,633668,233+23,6004,8805,0320.31%+152
ULTRAGENYX PHARMACEUTICAL IN(RARE)01,391,072+1,391,072050,5793.15%+50,579
DYNE THERAPEUTICS INC(DYN)524,499580,998+56,4995,4865,5310.34%+45
NUVATION BIO INC(NUVB)134,028134,028032360.00%+4
TALPHERA INC316,460316,46001571460.01%-11
AZENTA INC(AZTA)475,000530,400+55,40016,45416,3261.02%-128
KORRO BIO INC35,71935,71906224460.03%-176
MERSANA THERAPEUTICS INC3,814,6843,814,68401,3131,1290.07%-184
APELLIS PHARMACEUTICALS INC
COM
80,00084,300+4,3001,7501,4590.09%-290
GOSSAMER BIO INC0005,2604,9520.31%-308
APPLIED THERAPEUTICS INC2,074,8912,075,991+1,1001,0146460.04%-369
EDAP TMS S A1,270,0001,270,00002,4892,0960.13%-394
DANAHER CORPORATION(DHR)58,80059,000+20012,05411,6550.73%-399
ADAPTIMMUNE THERAPEUTICS PLC2,483,4680-2,483,4684890-489
JANUX THERAPEUTICS INC(JANX)204,466210,266+5,8005,5214,8570.30%-663
MINERALYS THERAPEUTICS INC(MLYS)320,813324,513+3,7005,0954,3910.27%-704
ZENAS BIOPHARMA INC(ZBIO)878,667640,467-238,2006,9416,2060.39%-735
SPRUCE BIOSCIENCES INC2,609,1250-2,609,1257570-757
PLIANT THERAPEUTICS INC589,9960-589,9967960-796
VIGIL NEUROSCIENCE INC471,9580-471,9588400-840
ACLARIS THERAPEUTICS INC(ACRS)5,046,3094,769,309-277,0007,7216,7720.42%-948
MIRUM PHARMACEUTICALS INC(MIRM)951,765818,206-133,55942,87741,6392.59%-1,239
BICARA THERAPEUTICS INC336,070336,07004,3793,1220.19%-1,257
NEWAMSTERDAM PHARMA COMPANY
ORDINARY SHARES
536,111536,111010,9749,7090.60%-1,265
MACROGENICS INC1,145,2140-1,145,2141,4540-1,454
BIOCRYST PHARMACEUTICALS INC(BCRX)222,0110-222,0111,6650-1,665
PULMONX CORP503,700651,100+147,4003,3901,6860.11%-1,704
INSPIRE MED SYS INC(INSP)99,250107,500+8,25015,80913,9500.87%-1,858
KYMERA THERAPEUTICS INC(KYMR)794,437450,374-344,06321,74419,6541.22%-2,089
XENON PHARMACEUTICALS INC(XENE)931,681931,681031,25829,1621.82%-2,096
DEXCOM INC(DXCM)397,650286,750-110,90027,15625,0301.56%-2,125
ZAI LAB LTD(ZLAB)904,592871,392-33,20032,69230,4731.90%-2,219
WEST PHARMACEUTICAL SVSC INC(WST)051,030+51,030011,1650.70%+11,165
SAGIMET BIOSCIENCES INC787,8080-787,8082,5680-2,568
ELI LILLY & CO(LLY)113,500116,500+3,00093,74190,8155.66%-2,926
BEAM THERAPEUTICS INC(BEAM)150,0200-150,0202,9300-2,930
MEREO BIOPHARMA GROUP PLC6,684,2474,465,292-2,218,95515,04012,1010.75%-2,939
TARSUS PHARMACEUTICALS INC(TARS)354,376373,750+19,37418,20415,1410.94%-3,064
PROTHENA CORP PLC
SHS
492,601492,60106,0962,9900.19%-3,106
INOZYME PHARMA INC3,445,2990-3,445,2993,1350-3,135
KESTRA MED TECHNOLOGIES LTD
SHS
145,0000-145,0003,6130-3,613
NOVAVAX INC(NVAX)650,00053,900-596,1004,1673400.02%-3,827
SUMMIT THERAPEUTICS INC(SMMT)995,000710,000-285,00019,19415,1090.94%-4,085
AMICUS THERAPEUTICS INC
COM
1,909,3621,960,334+50,97215,58011,2330.70%-4,348
NEVRO CORP800,4940-800,4944,6750-4,675
ACADIA HEALTHCARE COMPANY IN(ACHC)681,100696,000+14,90020,65115,7920.98%-4,859
PHREESIA INC0837,300+837,300023,8301.48%+23,830
89BIO INC844,44140,000-804,4416,1393930.02%-5,746
INTUITIVE SURGICAL INC082,000+82,000044,5602.78%+44,560
ALNYLAM PHARMACEUTICALS INC(ALNY)143,250100,000-43,25038,68032,6092.03%-6,071
ARGENX SE(ARGX)0175,750+175,750096,8776.04%+96,877
EDWARDS LIFESCIENCES CORP0131,000+131,000010,2460.64%+10,246
SAREPTA THERAPEUTICS INC(SRPT)068,600+68,60001,1730.07%+1,173
PENUMBRA INC(PEN)171,000128,500-42,50045,72732,9772.05%-12,750
MADRIGAL PHARMACEUTICALS INC(MDGL)0140,296+140,296042,4592.65%+42,459
IMMUNOVANT INC(IMVT)975,803221,500-754,30316,6763,5440.22%-13,132
AGILON HEALTH INC(AGL)6,950,0006,550,400-399,60030,09415,0660.94%-15,028
WARBY PARKER INC(WRBY)835,0000-835,00015,2220-15,222
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