Holders — by stockHoldings — by fund
Rock Springs Capital Management LP
Everything this manager disclosed owning in US-listed stocks — its complete Form 13F portfolio · as of 2026-06-30 · filed with the SEC up to 45 days after quarter end · CIK 0001595725
$2.05B
disclosed book value
104
positions
10.1%
largest position share
Positions, as of 2026-06-30
top 100 of 104 · 13F covers long US-listed positions only — cash, bonds, private and foreign stakes are not disclosed · PUT/CALL tags = options positions (share-equivalents), not shares held
| # | Issuer | Shares | Value | % of book |
|---|---|---|---|---|
| 1 | RVMDREVOLUTION MEDICINES INC | 1.1M | $207.0M | 10.1% |
| 2 | TVTXTRAVERE THERAPEUTICS INC | 2.2M | $123.8M | 6% |
| 3 | LLYELI LILLY & CO | 98,700 | $118.4M | 5.8% |
| 4 | MDGLMADRIGAL PHARMACEUTICALS INC | 174,999 | $94.0M | 4.6% |
| 5 | MIRMMIRUM PHARMACEUTICALS INC | 798,145 | $93.4M | 4.6% |
| 6 | RYTMRHYTHM PHARMACEUTICALS INC | 692,598 | $76.9M | 3.8% |
| 7 | KYMRKYMERA THERAPEUTICS INC | 453,156 | $52.0M | 2.5% |
| 8 | ARGXARGENX SE | 52,750 | $48.9M | 2.4% |
| 9 | ASCENDIS PHARMA A/S | 168,750 | $45.0M | 2.2% |
| 10 | XENEXENON PHARMACEUTICALS INC | 683,907 | $41.3M | 2% |
| 11 | SRRKSCHOLAR ROCK HLDG CORP | 715,452 | $39.3M | 1.9% |
| 12 | INSMINSMED INC | 362,150 | $38.6M | 1.9% |
| 13 | PENPENUMBRA INC | 115,750 | $36.5M | 1.8% |
| 14 | GPCRSTRUCTURE THERAPEUTICS INC | 640,317 | $34.4M | 1.7% |
| 15 | RAREULTRAGENYX PHARMACEUTICAL IN | 967,855 | $32.3M | 1.6% |
| 16 | IRTCIRHYTHM HOLDINGS INC | 269,650 | $32.1M | 1.6% |
| 17 | ISRGINTUITIVE SURGICAL INC | 76,460 | $30.4M | 1.5% |
| 18 | AGLAGILON HEALTH INC | 262,600 | $28.1M | 1.4% |
| 19 | UNHUNITEDHEALTH GROUP INC | 63,750 | $26.5M | 1.3% |
| 20 | CLDXCELLDEX THERAPEUTICS INC NEW | 699,146 | $26.0M | 1.3% |
| 21 | ERASERASCA INC | 1.4M | $25.7M | 1.3% |
| 22 | NBIXNEUROCRINE BIOSCIENCES INC | 144,750 | $24.4M | 1.2% |
| 23 | ELVNENLIVEN THERAPEUTICS INC | 464,625 | $23.6M | 1.2% |
| 24 | THCTENET HEALTHCARE CORP | 125,000 | $23.4M | 1.1% |
| 25 | DXCMDEXCOM INC | 343,000 | $23.1M | 1.1% |
| 26 | ACRSACLARIS THERAPEUTICS INC | 4.3M | $22.9M | 1.1% |
| 27 | MMEDMINIMED GROUP INC | 1.5M | $22.7M | 1.1% |
| 28 | BSXBOSTON SCIENTIFIC CORP | 528,500 | $22.6M | 1.1% |
| 29 | PHARVARIS N V | 648,333 | $22.4M | 1.1% |
| 30 | AVLNAVALYN PHARMACEUTICALS INC | 662,918 | $21.8M | 1.1% |
| 31 | COAGHEMAB THERAPEUTICS HLDGS INC | 575,432 | $21.1M | 1% |
| 32 | DYNDYNE THERAPEUTICS INC | 942,154 | $20.9M | 1% |
| 33 | ALNYALNYLAM PHARMACEUTICALS INC | 66,750 | $20.1M | 1% |
| 34 | COGTCOGENT BIOSCIENCES INC | 515,917 | $20.0M | 1% |
| 35 | AGIOAGIOS PHARMACEUTICALS INC | 532,563 | $19.8M | 1% |
| 36 | NEWAMSTERDAM PHARMA COMPANY | 582,744 | $19.7M | 1% |
| 37 | VERAVERA THERAPEUTICS INC | 427,584 | $18.3M | 0.9% |
| 38 | TARSTARSUS PHARMACEUTICALS INC | 277,087 | $17.4M | 0.9% |
| 39 | HTFLHEARTFLOW INC | 573,500 | $16.8M | 0.8% |
| 40 | MBXMBX BIOSCIENCES INC | 298,218 | $16.5M | 0.8% |
| 41 | CYTKCYTOKINETICS INC | 187,980 | $16.0M | 0.8% |
| 42 | BCAXBICARA THERAPEUTICS INC | 535,286 | $15.9M | 0.8% |
| 43 | PBLSPARABILIS MEDICINES INC | 578,028 | $15.8M | 0.8% |
| 44 | ZLABZAI LAB LTD | 814,707 | $15.5M | 0.8% |
| 45 | DHRDANAHER CORP DEL | 76,300 | $14.5M | 0.7% |
| 46 | TNGXTANGO THERAPEUTICS INC | 456,551 | $14.3M | 0.7% |
| 47 | EVHEVOLENT HEALTH INC | 2.5M | $13.6M | 0.7% |
| 48 | PTCTPTC THERAPEUTICS INC | 162,298 | $13.2M | 0.6% |
| 49 | MLYSMINERALYS THERAPEUTICS INC | 484,951 | $13.1M | 0.6% |
| 50 | ZBIOZENAS BIOPHARMA INC | 502,077 | $12.7M | 0.6% |
| 51 | ARDXARDELYX INC | 2.2M | $11.4M | 0.6% |
| 52 | INSPINSPIRE MED SYS INC | 244,000 | $10.9M | 0.5% |
| 53 | BBIOBRIDGEBIO PHARMA INC | 144,750 | $10.8M | 0.5% |
| 54 | ALKERMES PLC | 199,811 | $10.5M | 0.5% |
| 55 | SMMTSUMMIT THERAPEUTICS INC | 715,000 | $10.4M | 0.5% |
| 56 | AZTAAZENTA INC | 403,000 | $10.3M | 0.5% |
| 57 | INDVINDIVIOR PHARMACEUTICALS INC | 245,500 | $10.1M | 0.5% |
| 58 | SYKSTRYKER CORPORATION | 29,000 | $9.1M | 0.4% |
| 59 | AMLXAMYLYX PHARMACEUTICALS INC | 499,764 | $9.0M | 0.4% |
| 60 | CAICARIS LIFE SCIENCES INC | 487,500 | $8.7M | 0.4% |
| 61 | OMDAOMADA HEALTH INC | 373,000 | $8.2M | 0.4% |
| 62 | CMPXCOMPASS THERAPEUTICS INC | 3.5M | $7.7M | 0.4% |
| 63 | IMNMIMMUNOME INC | 347,666 | $7.4M | 0.4% |
| 64 | FOCLEDAP TMS S A | 1.4M | $7.2M | 0.4% |
| 65 | PHRPHREESIA INC | 696,900 | $7.2M | 0.4% |
| 66 | OMEROMEROS CORP | 718,499 | $6.8M | 0.3% |
| 67 | DFTXDEFINIUM THERAPEUTICS INC | 143,187 | $6.7M | 0.3% |
| 68 | CORTCORCEPT THERAPEUTICS INC | 72,000 | $6.3M | 0.3% |
| 69 | JANXJANUX THERAPEUTICS INC | 367,009 | $5.6M | 0.3% |
| 70 | MOBIMOBIA MED INC | 418,200 | $5.6M | 0.3% |
| 71 | RCUSARCUS BIOSCIENCES INC | 180,000 | $5.5M | 0.3% |
| 72 | TMOTHERMO FISHER SCIENTIFIC INC | 10,000 | $5.0M | 0.2% |
| 73 | TRVITREVI THERAPEUTICS INC | 260,000 | $4.8M | 0.2% |
| 74 | SIONSIONNA THERAPEUTICS INC | 99,429 | $4.4M | 0.2% |
| 75 | CVSCVS HEALTH CORP | 40,000 | $4.1M | 0.2% |
| 76 | EYPTEYEPOINT INC | 268,519 | $3.8M | 0.2% |
| 77 | OCULOCULAR THERAPEUTIX INC | 383,716 | $3.8M | 0.2% |
| 78 | SYRESPYRE THERAPEUTICS INC | 42,254 | $3.8M | 0.2% |
| 79 | TLPHTALPHERA INC | 3.6M | $3.7M | 0.2% |
| 80 | ROIVANT SCIENCES LTD | 101,000 | $3.6M | 0.2% |
| 81 | PCVXVAXCYTE INC | 60,250 | $3.5M | 0.2% |
| 82 | NGNENEUROGENE INC | 106,750 | $3.4M | 0.2% |
| 83 | IPSCCENTURY THERAPEUTICS INC | 1.3M | $3.2M | 0.2% |
| 84 | ATECALPHATEC HLDGS INC | 360,000 | $3.1M | 0.2% |
| 85 | NVONOVO-NORDISK A S | 63,500 | $3.0M | 0.1% |
| 86 | OLMAOLEMA PHARMACEUTICALS INC | 235,178 | $2.9M | 0.1% |
| 87 | NGENNERVGEN PHARMA CORP | 1.2M | $2.5M | 0.1% |
| 88 | MEDTRONIC PLC | 30,900 | $2.4M | 0.1% |
| 89 | TEVATEVA PHARMACEUTICAL INDS LTD | 59,000 | $2.0M | 0.1% |
| 90 | DNTHDIANTHUS THERAPEUTICS INC | 20,326 | $2.0M | 0.1% |
| 91 | SGMTSAGIMET BIOSCIENCES INC | 250,000 | $1.9M | 0.1% |
| 92 | CAPRCAPRICOR THERAPEUTICS INC | 74,448 | $1.8M | 0.1% |
| 93 | LENZLENZ THERAPEUTICS INC | 257,460 | $1.5M | 0.1% |
| 94 | ALTALTIMMUNE INC | 471,465 | $1.4M | 0.1% |
| 95 | KLRAKAILERA THERAPEUTICS INC | 65,000 | $1.4M | 0.1% |
| 96 | SGRYSURGERY PARTNERS INC | 84,000 | $1.4M | 0.1% |
| 97 | AXSMAXSOME THERAPEUTICS INC. | 5,500 | $1.3M | 0.1% |
| 98 | ORKAORUKA THERAPEUTICS INC | 12,051 | $1.1M | 0.1% |
| 99 | VKTXVIKING THERAPEUTICS INC | 25,500 | $994,755 | 0% |
| 100 | LEGNLEGEND BIOTECH CORP | 33,500 | $967,480 | 0% |
Source: SEC Form 13F-HR, reporting period 2026-06-30. Values are the manager's filed June-30-style quarter-end marks, not live prices. Research, not investment advice.