Rock Springs Capital Management LP Q1 2018 Filing
Filed May 15, 2018
Portfolio Value
$2.3T
Holdings
148
Report Date
Q1 2018
Filing Type
13F-HR
All Holdings (148 positions)
| # | Stock | Shares | Value | % Portfolio | Type |
|---|---|---|---|---|---|
| 1 | UNHUNITEDHEALTH GROUP INC | 487,500 | $104.3B | 4.45% | |
| 2 | ISRGINTUITIVE SURGICAL INC | 143,900 | $59.4B | 2.53% | |
| 3 | ABBVABBVIE INC | 600,000 | $56.8B | 2.42% | |
| 4 | ALXNALEXION PHARMACEUTICALS INC | 485,000 | $54.1B | 2.31% | |
| 5 | NBIXNEUROCRINE BIOSCIENCES INC | 606,200 | $50.3B | 2.14% | |
| 6 | ACHCACADIA HEALTHCARE COMPANY IN | 1,253,500 | $49.1B | 2.10% | |
| 7 | COLLCOLLEGIUM PHARMACEUTICAL INC | 1,920,000 | $49.1B | 2.09% | |
| 8 | MOHMOLINA HEALTHCARE INC | 576,000 | $46.8B | 1.99% | |
| 9 | —SPARK THERAPEUTICS INC | 623,500 | $41.5B | 1.77% | |
| 10 | BMYBRISTOL MYERS SQUIBB CO | 650,000 | $41.1B | 1.75% | |
| 11 | —GW PHARMACEUTICALS PLC | 360,000 | $40.6B | 1.73% | |
| 12 | —AETNA INC NEW | 239,000 | $40.4B | 1.72% | |
| 13 | MDGLMADRIGAL PHARMACEUTICALS INC | 325,500 | $38.0B | 1.62% | |
| 14 | ONCBEIGENE LTD | 221,250 | $37.2B | 1.59% | |
| 15 | HCAHCA HEALTHCARE INC | 380,000 | $36.9B | 1.57% | |
| 16 | —LOXO ONCOLOGY INC | 316,500 | $36.5B | 1.56% | |
| 17 | —RADIUS HEALTH INC | 1,000,000 | $35.9B | 1.53% | |
| 18 | PCRXPACIRA PHARMACEUTICALS INC | 1,125,000 | $35.0B | 1.49% | |
| 19 | PRAHPRA HEALTH SCIENCES INC | 395,000 | $32.8B | 1.40% | |
| 20 | —TESARO INC | 573,000 | $32.7B | 1.40% | |
| 21 | IRTCIRHYTHM TECHNOLOGIES INC | 477,500 | $30.1B | 1.28% | |
| 22 | VRTXVERTEX PHARMACEUTICALS INC | 181,000 | $29.5B | 1.26% | |
| 23 | SYKSTRYKER CORP | 178,000 | $28.6B | 1.22% | |
| 24 | PENPENUMBRA INC | 243,000 | $28.1B | 1.20% | |
| 25 | PBYIPUMA BIOTECHNOLOGY INC | 412,900 | $28.1B | 1.20% | |
| 26 | CELGCELGENE CORP | 310,100 | $27.7B | 1.18% | |
| 27 | DVADAVITA INC | 407,500 | $26.9B | 1.15% | |
| 28 | EWEDWARDS LIFESCIENCES CORP | 190,001 | $26.5B | 1.13% | |
| 29 | WCGEURWELLCARE HEALTH PLANS INC | 134,000 | $25.9B | 1.11% | |
| 30 | ABGAMERISOURCEBERGEN CORP | 295,000 | $25.4B | 1.08% | |
| 31 | TMOTHERMO FISHER SCIENTIFIC INC | 114,500 | $23.6B | 1.01% | |
| 32 | GILDGILEAD SCIENCES INC | 313,400 | $23.6B | 1.01% | |
| 33 | TFXTELEFLEX INC | 92,500 | $23.6B | 1.01% | |
| 34 | —AVEXIS INC | 190,000 | $23.5B | 1.00% | |
| 35 | —MEDICINES CO | 690,000 | $22.7B | 0.97% | |
| 36 | —EPIZYME INC | 1,275,000 | $22.6B | 0.97% | |
| 37 | ASMBASSEMBLY BIOSCIENCES INC | 443,000 | $21.8B | 0.93% | |
| 38 | —MERSANA THERAPEUTICS INC | 1,300,000 | $20.5B | 0.87% | |
| 39 | —WRIGHT MED GROUP N V | 1,000,000 | $19.8B | 0.85% | |
| 40 | —ALDER BIOPHARMACEUTICALS INC | 1,529,800 | $19.4B | 0.83% | |
| 41 | BAXBAXTER INTL INC | 297,000 | $19.3B | 0.82% | |
| 42 | SRPTSAREPTA THERAPEUTICS INC | 258,000 | $19.1B | 0.82% | |
| 43 | EHCENCOMPASS HEALTH CORP | 327,000 | $18.7B | 0.80% | |
| 44 | JAZZJAZZ PHARMACEUTICALS PLC | 123,700 | $18.7B | 0.80% | |
| 45 | IM8NINSMED INC | 825,000 | $18.6B | 0.79% | |
| 46 | ASNDASCENDIS PHARMA A S | 283,500 | $18.5B | 0.79% | |
| 47 | GLPGGALAPAGOS NV | 185,000 | $18.5B | 0.79% | |
| 48 | AXGNAXOGEN INC | 505,000 | $18.4B | 0.79% | |
| 49 | ALNYALNYLAM PHARMACEUTICALS INC | 143,000 | $17.0B | 0.73% | |
| 50 | —AUDENTES THERAPEUTICS INC | 565,000 | $17.0B | 0.72% | |
| 51 | PRTAPROTHENA CORP PLC | 453,500 | $16.6B | 0.71% | Call |
| 52 | AFWALIGN TECHNOLOGY INC | 65,500 | $16.4B | 0.70% | |
| 53 | —INTERSECT ENT INC | 410,000 | $16.1B | 0.69% | |
| 54 | ZBHZIMMER BIOMET HLDGS INC | 147,500 | $16.1B | 0.69% | |
| 55 | NUVAGBPNUVASIVE INC | 305,000 | $15.9B | 0.68% | |
| 56 | TBPHTHERAVANCE BIOPHARMA INC | 652,600 | $15.8B | 0.68% | |
| 57 | INCYINCYTE CORP | 182,500 | $15.2B | 0.65% | |
| 58 | AM6AMICUS THERAPEUTICS INC | 1,000,000 | $15.0B | 0.64% | |
| 59 | HOLXHOLOGIC INC | 400,000 | $14.9B | 0.64% | |
| 60 | EXASEXACT SCIENCES CORP | 370,500 | $14.9B | 0.64% | |
| 61 | ARNAEURARENA PHARMACEUTICALS INC | 375,000 | $14.8B | 0.63% | |
| 62 | BIIBBIOGEN INC | 53,000 | $14.5B | 0.62% | |
| 63 | 2L9BLUEPRINT MEDICINES CORP | 157,753 | $14.5B | 0.62% | |
| 64 | FGENEURFIBROGEN INC | 309,500 | $14.3B | 0.61% | |
| 65 | ANABANAPTYSBIO INC | 135,000 | $14.1B | 0.60% | |
| 66 | INGNINOGEN INC | 110,500 | $13.6B | 0.58% | |
| 67 | HRTXHERON THERAPEUTICS INC | 476,000 | $13.1B | 0.56% | |
| 68 | —MENLO THERAPEUTICS INC | 330,000 | $12.4B | 0.53% | |
| 69 | CLVSEURCLOVIS ONCOLOGY INC | 231,500 | $12.2B | 0.52% | |
| 70 | IDXXIDEXX LABS INC | 63,000 | $12.1B | 0.51% | |
| 71 | AMRNAMARIN CORP PLC | 4,000,000 | $12.0B | 0.51% | |
| 72 | ARDXARDELYX INC | 2,275,557 | $11.5B | 0.49% | |
| 73 | —OBSEVA SA | 840,000 | $11.3B | 0.48% | |
| 74 | FIXXEURHOMOLOGY MEDICINES INC | 575,000 | $10.8B | 0.46% | |
| 75 | GTHXEURG1 THERAPEUTICS INC | 287,000 | $10.6B | 0.45% | |
| 76 | —PORTOLA PHARMACEUTICALS INC | 323,800 | $10.6B | 0.45% | |
| 77 | CLSDUSDCLEARSIDE BIOMEDICAL INC | 975,000 | $10.5B | 0.45% | |
| 78 | BMRNBIOMARIN PHARMACEUTICAL INC | 125,000 | $10.1B | 0.43% | |
| 79 | —FIVE PRIME THERAPEUTICS INC | 585,500 | $10.1B | 0.43% | |
| 80 | ADAPYADAPTIMMUNE THERAPEUTICS PLC | 875,000 | $9.8B | 0.42% | |
| 81 | ACRSACLARIS THERAPEUTICS INC | 530,000 | $9.3B | 0.40% | |
| 82 | RIGLUSDRIGEL PHARMACEUTICALS INC | 2,575,000 | $9.1B | 0.39% | |
| 83 | —ZOGENIX INC | 225,500 | $9.0B | 0.39% | |
| 84 | —GLOBAL CORD BLOOD CORPORATIO | 880,000 | $9.0B | 0.38% | |
| 85 | —RTI SURGICAL INC | 1,950,000 | $9.0B | 0.38% | |
| 86 | —RETROPHIN INC | 400,000 | $8.9B | 0.38% | |
| 87 | RAREULTRAGENYX PHARMACEUTICAL IN | 173,000 | $8.8B | 0.38% | |
| 88 | ZTSZOETIS INC | 101,000 | $8.4B | 0.36% | |
| 89 | —BIOHAVEN PHARMACTL HLDG CO L | 325,000 | $8.4B | 0.36% | |
| 90 | —ACHILLION PHARMACEUTICALS IN | 2,250,000 | $8.3B | 0.36% | |
| 91 | —ODONATE THERAPEUTICS INC | 383,500 | $8.1B | 0.35% | |
| 92 | SG7SAGE THERAPEUTICS INC | 49,000 | $7.9B | 0.34% | |
| 93 | —BLUEBIRD BIO INC | 45,000 | $7.7B | 0.33% | |
| 94 | CHRSCOHERUS BIOSCIENCES INC | 695,000 | $7.7B | 0.33% | |
| 95 | SPROSPERO THERAPEUTICS INC | 525,000 | $7.5B | 0.32% | |
| 96 | GBTUSDGLOBAL BLOOD THERAPEUTICS IN | 150,000 | $7.2B | 0.31% | |
| 97 | MGNXMACROGENICS INC | 275,000 | $6.9B | 0.30% | |
| 98 | CRVSCORVUS PHARMACEUTICALS INC | 575,000 | $6.6B | 0.28% | |
| 99 | —IMMUNOMEDICS INC | 450,000 | $6.6B | 0.28% | |
| 100 | NVTA1EURINVITAE CORP | 1,400,000 | $6.6B | 0.28% |
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