Q2 2025 · 13F-HR
Rock Springs Capital Management LPholdings as filed
Filed 2025-08-14 · accession 0001172661-25-003273
$1.60B
Reported value
93
Positions
2025-06-30
Period end
The Brief · Rock Springs Capital Management LP · Q2 2025
AI · grounded in 13F
Rock Springs Capital Management LP established a new position in ARGENX SE ARGX worth $96.9M. The fund also initiated new stakes in ELI LILLY & CO LLY for $90.8M and MERUS N V 2GH for $55.9M. Other new additions include RHYTHM PHARMACEUTICALS INC RYTM, INSMED INC INSM, and ULTRAGENYX PHARMACEUTICAL IN RARE.
Holdings as filed
| CUSIP | Ticker | Issuer | Value | % port. | Shares | Class | Voting |
|---|---|---|---|---|---|---|---|
| 04016X101 | ARGX | ARGENX SE | $96.9M | 6.04% | 175,750 | Common | SOLE |
| 532457108 | LLY | ELI LILLY & CO | $90.8M | 5.66% | 116,500 | Common | SOLE |
| N5749R100 | 2GH | MERUS N V | $55.9M | 3.49% | 1,063,608 | Common | SOLE |
| 76243J105 | RYTM | RHYTHM PHARMACEUTICALS INC | $54.4M | 3.39% | 861,153 | Common | SOLE |
| 457669307 | INSM | INSMED INC | $52.8M | 3.29% | 525,000 | Common | SOLE |
| 90400D108 | RARE | ULTRAGENYX PHARMACEUTICAL IN | $50.6M | 3.15% | 1,391,072 | Common | SOLE |
| 76155X100 | RVMD | REVOLUTION MEDICINES INC | $49.0M | 3.05% | 1,330,960 | Common | SOLE |
| 46120E602 | ISRG | INTUITIVE SURGICAL INC | $44.6M | 2.78% | 82,000 | Common | SOLE |
| 558868105 | MDGL | MADRIGAL PHARMACEUTICALS INC | $42.5M | 2.65% | 140,296 | Common | SOLE |
| 604749101 | MIRM | MIRUM PHARMACEUTICALS INC | $41.6M | 2.59% | 818,206 | Common | SOLE |
| 101137107 | BSX | BOSTON SCIENTIFIC CORP | $38.1M | 2.38% | 355,000 | Common | SOLE |
| 04351P101 | ASNDUSD | ASCENDIS PHARMA A/S | $37.5M | 2.33% | 217,000 | Common | SOLE |
| 450056106 | IRTC | IRHYTHM TECHNOLOGIES INC | $37.3M | 2.33% | 242,500 | Common | SOLE |
| 00973Y108 | AKRO | AKERO THERAPEUTICS INC | $34.2M | 2.13% | 640,526 | Common | SOLE |
| 70975L107 | PEN | PENUMBRA INC | $33.0M | 2.05% | 128,500 | Common | SOLE |
| 00847X104 | AGIO | AGIOS PHARMACEUTICALS INC | $32.9M | 2.05% | 989,745 | Common | SOLE |
| 02043Q107 | ALNY | ALNYLAM PHARMACEUTICALS INC | $32.6M | 2.03% | 100,000 | Common | SOLE |
| 30050B101 | EVH | EVOLENT HEALTH INC | $31.8M | 1.98% | 2,820,700 | Common | SOLE |
| 98887Q104 | ZLAB | ZAI LAB LTD | $30.5M | 1.90% | 871,392 | Common | SOLE |
| 30063P105 | EXK | EXACT SCIENCES CORP | $30.4M | 1.89% | 572,000 | Common | SOLE |
| 98420N105 | XENE | XENON PHARMACEUTICALS INC | $29.2M | 1.82% | 931,681 | Common | SOLE |
| 89422G107 | TVTX | TRAVERE THERAPEUTICS INC | $28.2M | 1.76% | 1,908,208 | Common | SOLE |
| 80706P103 | SRRK | SCHOLAR ROCK HLDG CORP | $28.1M | 1.75% | 794,133 | Common | SOLE |
| 252131107 | DXCM | DEXCOM INC | $25.0M | 1.56% | 286,750 | Common | SOLE |
| 71944F106 | PHR | PHREESIA INC | $23.8M | 1.48% | 837,300 | Common | SOLE |
| 09627Y109 | 2655787D | BLUEPRINT MEDICINES CORP | $23.8M | 1.48% | 185,500 | Common | SOLE |
| 86366E106 | GPCR | STRUCTURE THERAPEUTICS INC | $23.6M | 1.47% | 1,135,879 | Common | SOLE |
| 88033G407 | THC | TENET HEALTHCARE CORP | $22.9M | 1.43% | 130,000 | Common | SOLE |
| 142152107 | CAI | CARIS LIFE SCIENCES INC | $21.2M | 1.32% | 793,651 | Common | SOLE |
| 501575104 | KYMR | KYMERA THERAPEUTICS INC | $19.7M | 1.22% | 450,374 | Common | SOLE |
| 68170A108 | OMDA | OMADA HEALTH INC | $16.8M | 1.05% | 919,951 | Common | SOLE |
| 15117B202 | CLDX | CELLDEX THERAPEUTICS INC NEW | $16.5M | 1.03% | 812,653 | Common | SOLE |
| 114340102 | AZTA | AZENTA INC | $16.3M | 1.02% | 530,400 | Common | SOLE |
| 00404A109 | ACHC | ACADIA HEALTHCARE COMPANY IN | $15.8M | 0.98% | 696,000 | Common | SOLE |
| 91324P102 | UNH | UNITEDHEALTH GROUP INC | $15.8M | 0.98% | 50,500 | Common | SOLE |
| 87650L103 | TARS | TARSUS PHARMACEUTICALS INC | $15.1M | 0.94% | 373,750 | Common | SOLE |
| 86627T108 | SMMT | SUMMIT THERAPEUTICS INC | $15.1M | 0.94% | 710,000 | Common | SOLE |
| 00857U107 | AGL | AGILON HEALTH INC | $15.1M | 0.94% | 6,550,400 | Common | SOLE |
| 687793109 | OSCR | OSCAR HEALTH INC | $15.0M | 0.94% | 700,000 | Common | SOLE |
| 92337R101 | VERA | VERA THERAPEUTICS INC | $14.5M | 0.91% | 617,396 | Common | SOLE |
| 29337E102 | ELVN | ENLIVEN THERAPEUTICS INC | $14.1M | 0.88% | 701,408 | Common | SOLE |
| 457730109 | INSP | INSPIRE MED SYS INC | $14.0M | 0.87% | 107,500 | Common | SOLE |
| 834203309 | SLNO | SOLENO THERAPEUTICS INC | $12.9M | 0.81% | 154,528 | Common | SOLE |
| 20454B104 | CMPX | COMPASS THERAPEUTICS INC | $12.9M | 0.80% | 4,962,955 | Common | SOLE |
| 78464A870 | XBI | SPDR SERIES TRUST | $12.6M | 0.78% | 151,750 | Common | SOLE |
| 03940C100 | ACLXGBX | ARCELLX INC | $12.3M | 0.76% | 186,314 | Common | SOLE |
| 589492107 | MREO | MEREO BIOPHARMA GROUP PLC | $12.1M | 0.75% | 4,465,292 | Common | SOLE |
| 235851102 | DHR | DANAHER CORPORATION | $11.7M | 0.73% | 59,000 | Common | SOLE |
| 03152W109 | AM6 | AMICUS THERAPEUTICS INC | $11.2M | 0.70% | 1,960,334 | Common | SOLE |
| 955306105 | WST | WEST PHARMACEUTICAL SVSC INC | $11.2M | 0.70% | 51,030 | Common | SOLE |
| 64125C109 | NBIX | NEUROCRINE BIOSCIENCES INC | $11.2M | 0.70% | 88,800 | Common | SOLE |
| N69605108 | PHVS | PHARVARIS N V | $11.0M | 0.68% | 623,402 | Common | SOLE |
| 28176E108 | EW | EDWARDS LIFESCIENCES CORP | $10.2M | 0.64% | 131,000 | Common | SOLE |
| N62509109 | NAMS | NEWAMSTERDAM PHARMA COMPANY | $9.7M | 0.60% | 536,111 | Common | SOLE |
| 039697107 | ARDX | ARDELYX INC | $9.0M | 0.56% | 2,286,273 | Common | SOLE |
| 670703107 | NUVL | NUVALENT INC | $7.1M | 0.44% | 93,328 | Common | SOLE |
| 00461U105 | ACRS | ACLARIS THERAPEUTICS INC | $6.8M | 0.42% | 4,769,309 | Common | SOLE |
| 171757206 | CDTX | CIDARA THERAPEUTICS INC | $6.5M | 0.41% | 134,133 | Common | SOLE |
| 98937L105 | ZBIO | ZENAS BIOPHARMA INC | $6.2M | 0.39% | 640,467 | Common | SOLE |
| 75886F107 | REGN | REGENERON PHARMACEUTICALS | $5.9M | 0.37% | 11,300 | Common | SOLE |
| 19240Q201 | COGT | COGENT BIOSCIENCES INC | $5.7M | 0.36% | 800,199 | Common | SOLE |
| 26818M108 | DYN | DYNE THERAPEUTICS INC | $5.5M | 0.34% | 580,998 | Common | SOLE |
| 230031106 | CGEM | CULLINAN THERAPEUTICS INC | $5.0M | 0.31% | 668,233 | Common | SOLE |
| 38341PAA0 | GOSS 5 06/01/27 | GOSSAMER BIO INC | $5.0M | 0.31% | 9,573,000 | Common | SOLE |
| 47103J105 | JANX | JANUX THERAPEUTICS INC | $4.9M | 0.30% | 210,266 | Common | SOLE |
| 603170101 | MLYS | MINERALYS THERAPEUTICS INC | $4.4M | 0.27% | 324,513 | Common | SOLE |
| 883556102 | TMO | THERMO FISHER SCIENTIFIC INC | $4.1M | 0.25% | 10,000 | Common | SOLE |
| 38341P102 | GOSS | GOSSAMER BIO INC | $4.0M | 0.25% | 3,266,960 | Common | SOLE |
| 45258J102 | IMVT | IMMUNOVANT INC | $3.5M | 0.22% | 221,500 | Common | SOLE |
| 03237H101 | AMLX | AMYLYX PHARMACEUTICALS INC | $3.2M | 0.20% | 499,764 | Common | SOLE |
| 055477103 | BCAX | BICARA THERAPEUTICS INC | $3.1M | 0.19% | 336,070 | Common | SOLE |
| 471871202 | JSPR | JASPER THERAPEUTICS INC | $3.0M | 0.19% | 545,171 | Common | SOLE |
| G72800108 | PRTA | PROTHENA CORP PLC | $3.0M | 0.19% | 492,601 | Common | SOLE |
| 02081G201 | ATEC | ALPHATEC HLDGS INC | $3.0M | 0.19% | 267,500 | Common | SOLE |
| 52635N103 | LENZ | LENZ THERAPEUTICS INC | $2.5M | 0.15% | 83,982 | Common | SOLE |
| 268311107 | EDAP | EDAP TMS S A | $2.1M | 0.13% | 1,270,000 | Common | SOLE |
| M25722105 | CGEN | COMPUGEN LTD | $1.8M | 0.11% | 989,990 | Common | SOLE |
| 829401108 | SION | SIONNA THERAPEUTICS INC | $1.7M | 0.11% | 99,429 | Common | SOLE |
| 745848101 | LUNG | PULMONX CORP | $1.7M | 0.11% | 651,100 | Common | SOLE |
| 64135M105 | NGNE | NEUROGENE INC | $1.6M | 0.10% | 104,339 | Common | SOLE |
| 46489V302 | CATX | PERSPECTIVE THERAPEUTICS INC | $1.5M | 0.10% | 444,383 | Common | SOLE |
| 03753U106 | APLSUSD | APELLIS PHARMACEUTICALS INC | $1.5M | 0.09% | 84,300 | Common | SOLE |
| 803607100 | SRPT | SAREPTA THERAPEUTICS INC | $1.2M | 0.07% | 68,600 | Common | SOLE |
| 59045L106 | MRSN | MERSANA THERAPEUTICS INC | $1.1M | 0.07% | 3,814,684 | Common | SOLE |
| 03828A101 | APLT | APPLIED THERAPEUTICS INC | $645,841 | 0.04% | 2,075,991 | Common | SOLE |
| 00653A107 | ADAPY | ADAPTIMMUNE THERAPEUTICS PLC | $595,287 | 0.04% | 2,483,468 | Common | SOLE |
| 500946108 | KRRO | KORRO BIO INC | $446,130 | 0.03% | 35,719 | Common | SOLE |
| 159864107 | CRL | CHARLES RIV LABS INTL INC | $409,671 | 0.03% | 2,700 | Common | SOLE |
| 282559103 | ETNBGBP | 89BIO INC | $392,800 | 0.02% | 40,000 | Common | SOLE |
| 92243G108 | PCVX | VAXCYTE INC | $360,861 | 0.02% | 11,100 | Common | SOLE |
| 670002401 | NVAX | NOVAVAX INC | $339,570 | 0.02% | 53,900 | Common | SOLE |
| 00444T209 | TLPH | TALPHERA INC | $145,635 | 0.01% | 316,460 | Common | SOLE |
| 67080N119 | NUVB/WS | NUVATION BIO INC | $36,174 | 0.00% | 134,028 | Common | SOLE |
Source: SEC EDGAR · raw 13F holdings as filed. The Class column shows the option type when reported (Put/Call) or Common when the issuer's equity is held directly. 13F discloses long positions only.