Rock Springs Capital Management LP Diversified Active

Location: Baltimore, MD

CIK: 0001595725 · Show all filings

Period: Q1 2017 (← Previous) (Next →)

Filing Date: May 15, 2017

Total Value: $1.733B (99.2% shares, 0.8% debt)

Holdings (140)

TESARO INC 4.2%
Value $73.07M Shares 474,900 Est. Cost $61.31 Unrealized
ACHC ACADIA HEALTHCARE COMPANY IN 3.2%
Value $55.59M Shares 1,275,000 Est. Cost $56.08 Unrealized -27.7%
ALEXION PHARMACEUTICALS INC 3.2%
Value $55.4M Shares 456,900 Est. Cost $140.01 Unrealized
MRK MERCK & CO INC 2.7%
Value $47.66M Shares 750,000 Est. Cost $43.81 Unrealized +5.1%
PCRX PACIRA PHARMACEUTICALS INC 2.6%
Value $45.6M Shares 1,000,000 Est. Cost $49.52 Unrealized -12.7%
GW PHARMACEUTICALS PLC 2.5%
Value $43.12M Shares 356,500 Est. Cost $94.45 Unrealized
ALLERGAN PLC 2.3%
Value $39.66M Shares 166,000 Est. Cost $296.87 Unrealized
CIGNA CORPORATION 2.3%
Value $39.55M Shares 270,000 Est. Cost $118.36 Unrealized
ISRG INTUITIVE SURGICAL INC 2.1%
Value $36.79M Shares 48,000 Est. Cost $53.34 Unrealized +48.1%
RADIUS HEALTH INC 2.0%
Value $35.18M Shares 910,250 Est. Cost $44.64 Unrealized
MEDICINES CO 2.0%
Value $34.23M Shares 700,000 Est. Cost $33.00 Unrealized
ADVANCED ACCELERATOR APPLIC 2.0%
Value $33.88M Shares 850,000 Est. Cost $31.31 Unrealized
SPARK THERAPEUTICS INC 1.9%
Value $33.34M Shares 625,000 Est. Cost $58.29 Unrealized
WELLCARE HEALTH PLANS INC 1.9%
Value $32.88M Shares 234,500 Est. Cost $79.73 Unrealized
CELGENE CORP 1.7%
Value $30.17M Shares 242,500 Est. Cost $118.41 Unrealized
PRA HEALTH SCIENCES INC 1.7%
Value $29.84M Shares 457,500 Est. Cost $41.51 Unrealized
AETNA INC NEW 1.6%
Value $28.06M Shares 220,000 Est. Cost $102.02 Unrealized
LLY LILLY ELI & CO 1.6%
Value $27.34M Shares 325,000 Est. Cost $60.99 Unrealized +14.0%
HUM HUMANA INC 1.6%
Value $27.31M Shares 132,500 Est. Cost $191.96 Unrealized 0.0%
UNH UNITEDHEALTH GROUP INC 1.6%
Value $27.06M Shares 165,000 Est. Cost $129.15 Unrealized +10.0%
PEN PENUMBRA INC 1.5%
Value $25.91M Shares 310,500 Est. Cost $48.06 Unrealized +57.5%
ARDX ARDELYX INC 1.5%
Value $25.3M Shares 2,000,000 Est. Cost $11.10 Unrealized +18.6%
BMY BRISTOL MYERS SQUIBB CO 1.4%
Value $24.61M Shares 452,600 Est. Cost $42.96 Unrealized -7.0%
SHIRE PLC 1.4%
Value $24.2M Shares 138,900 Est. Cost $184.37 Unrealized
INCY INCYTE CORP 1.3%
Value $22.59M Shares 169,000 Est. Cost $64.32 Unrealized +97.9%
TBPH THERAVANCE BIOPHARMA INC 1.3%
Value $22.09M Shares 600,000 Est. Cost $19.05 Unrealized +67.7%
JNJ JOHNSON & JOHNSON 1.3%
Value $21.8M Shares 175,000 Est. Cost $93.39 Unrealized 0.0%
WRIGHT MED GROUP N V 1.2%
Value $20.85M Shares 670,000 Est. Cost $23.14 Unrealized
ACRS ACLARIS THERAPEUTICS INC 1.2%
Value $20.13M Shares 675,000 Est. Cost $19.88 Unrealized +45.0%
GILD GILEAD SCIENCES INC 1.1%
Value $19.46M Shares 286,500 Est. Cost $55.44 Unrealized -8.6%
GLPG GALAPAGOS NV 1.0%
Value $18.1M Shares 210,000 Est. Cost $48.55 Unrealized
JAZZ JAZZ PHARMACEUTICALS PLC 1.0%
Value $17.95M Shares 123,700 Est. Cost $146.27 Unrealized -11.0%
NBIX NEUROCRINE BIOSCIENCES INC 1.0%
Value $17.75M Shares 410,000 Est. Cost $19.74 Unrealized +117.1%
PRTA PROTHENA CORP PLC 1.0%
Value $17.27M Shares 309,500 Est. Cost $29.28 Unrealized +79.4%
COLL COLLEGIUM PHARMACEUTICAL INC 1.0%
Value $17.1M Shares 1,700,000 Est. Cost $16.24 Unrealized -8.5%
RA PHARMACEUTICALS INC 1.0%
Value $16.8M Shares 788,959 Est. Cost $15.19 Unrealized
AMGN AMGEN INC 0.9%
Value $16.08M Shares 98,000 Est. Cost $92.81 Unrealized +37.0%
AMARIN CORP PLC 0.9%
Value $16M Shares 5,001,200 Est. Cost $3.19 Unrealized
HOLX HOLOGIC INC 0.8%
Value $14.47M Shares 340,000 Est. Cost $36.33 Unrealized +12.2%
WTW WILLIS TOWERS WATSON PUB LTD 0.8%
Value $14.4M Shares 110,000 Est. Cost $109.36 Unrealized +2.7%
CHRS COHERUS BIOSCIENCES INC 0.8%
Value $14.28M Shares 675,000 Est. Cost $22.48 Unrealized +9.4%
DHR DANAHER CORP DEL 0.8%
Value $13.69M Shares 160,000 Est. Cost $67.27 Unrealized +5.9%
EW EDWARDS LIFESCIENCES CORP 0.8%
Value $13.4M Shares 142,500 Est. Cost $30.49 Unrealized +2.7%
WALGREENS BOOTS ALLIANCE INC 0.8%
Value $13.37M Shares 161,000 Est. Cost $84.02 Unrealized
INVITAE CORP 0.8%
Value $13.27M Shares 1,200,000 Est. Cost $10.63 Unrealized
DERMIRA INC 0.8%
Value $13.22M Shares 387,600 Est. Cost $21.61 Unrealized
BIIB BIOGEN INC 0.8%
Value $13.12M Shares 48,000 Est. Cost $274.00 Unrealized +3.2%
CLOVIS ONCOLOGY INC 0.7%
Value $11.75M Shares 184,500 Est. Cost $46.58 Unrealized
THERAPEUTICSMD INC 0.7%
Value $11.52M Shares 1,600,000 Est. Cost $7.12 Unrealized
HEALTHSOUTH CORP 0.7%
Value $11.35M Shares 265,000 Est. Cost $41.93 Unrealized
BMRN BIOMARIN PHARMACEUTICAL INC 0.6%
Value $10.97M Shares 125,000 Est. Cost $100.37 Unrealized -11.4%
ALMOST FAMILY INC 0.6%
Value $10.94M Shares 225,000 Est. Cost $48.60 Unrealized
RARE ULTRAGENYX PHARMACEUTICAL IN 0.6%
Value $10.83M Shares 159,750 Est. Cost $61.83 Unrealized +23.3%
AVEXIS INC 0.6%
Value $10.64M Shares 140,000 Est. Cost $27.24 Unrealized
PATHEON N V 0.6%
Value $10.54M Shares 400,000 Est. Cost $29.63 Unrealized
PARATEK PHARMACEUTICALS INC 0.6%
Value $10.12M Shares 525,500 Est. Cost $14.59 Unrealized
ASSEMBLY BIOSCIENCES INC 0.6%
Value $9.941M Shares 390,000 Est. Cost $12.30 Unrealized
VRTX VERTEX PHARMACEUTICALS INC 0.6%
Value $9.896M Shares 90,500 Est. Cost $85.36 Unrealized +3.1%
EPIZYME INC 0.6%
Value $9.776M Shares 570,000 Est. Cost $17.19 Unrealized
ONC BEIGENE LTD 0.6%
Value $9.702M Shares 265,000 Est. Cost $29.47 Unrealized
MERUS N V 0.5%
Value $9.379M Shares 384,548 Est. Cost $9.03 Unrealized
ASND ASCENDIS PHARMA A S 0.5%
Value $9.1M Shares 325,000 Est. Cost $17.44 Unrealized
ENVISION HEALTHCARE CORP 0.5%
Value $8.891M Shares 145,000 Est. Cost $63.29 Unrealized
CRVS CORVUS PHARMACEUTICALS INC 0.5%
Value $8.777M Shares 422,600 Est. Cost $14.35 Unrealized +9.2%
OBSEVA SA 0.5%
Value $8.73M Shares 838,634 Est. Cost $10.41 Unrealized
AUDENTES THERAPEUTICS INC 0.5%
Value $8.52M Shares 500,000 Est. Cost $17.79 Unrealized
INSM INSMED INC 0.5%
Value $8.195M Shares 468,000 Est. Cost $16.84 Unrealized -8.4%
EXAS EXACT SCIENCES CORP 0.5%
Value $7.972M Shares 337,500 Est. Cost $17.57 Unrealized +12.8%
LOXO ONCOLOGY INC 0.4%
Value $7.616M Shares 181,000 Est. Cost $42.08 Unrealized
RTI SURGICAL INC 0.4%
Value $7.44M Shares 1,860,000 Est. Cost $4.28 Unrealized
CLEARSIDE BIOMEDICAL INC 0.4%
Value $7.424M Shares 935,000 Est. Cost $7.01 Unrealized
RETROPHIN INC 0.4%
Value $7.384M Shares 400,000 Est. Cost $23.91 Unrealized
ALKS ALKERMES PLC 0.4%
Value $7.313M Shares 125,000 Est. Cost $39.49 Unrealized +43.6%
ATHENAHEALTH INC 0.4%
Value $7.071M Shares 62,750 Est. Cost $115.55 Unrealized
EGALET CORP 0.4%
Value $6.455M Shares 7,800,000 Est. Cost $0.76 Unrealized
TETRAPHASE PHARMACEUTICALS I 0.4%
Value $6.415M Shares 698,000 Est. Cost $5.86 Unrealized
AIMMUNE THERAPEUTICS INC 0.4%
Value $6.367M Shares 293,000 Est. Cost $22.58 Unrealized
ACHILLION PHARMACEUTICALS IN 0.4%
Value $6.315M Shares 1,500,000 Est. Cost $9.07 Unrealized
NABRIVA THERAPEUTICS AG 0.4%
Value $6.3M Shares 525,000 Est. Cost $8.51 Unrealized
FIVE PRIME THERAPEUTICS INC 0.3%
Value $5.965M Shares 165,000 Est. Cost $27.02 Unrealized
INTERSECT ENT INC 0.3%
Value $5.917M Shares 345,000 Est. Cost $25.70 Unrealized
FIBROGEN INC 0.3%
Value $5.916M Shares 240,000 Est. Cost $25.02 Unrealized
CHINA CORD BLOOD CORP 0.3%
Value $5.861M Shares 880,000 Est. Cost $4.24 Unrealized
REGN REGENERON PHARMACEUTICALS 0.3%
Value $5.851M Shares 15,100 Est. Cost $400.92 Unrealized -8.1%
SRPT SAREPTA THERAPEUTICS INC 0.3%
Value $5.742M Shares 194,000 Est. Cost $30.88 Unrealized +0.2%
GLOBAL BLOOD THERAPEUTICS IN 0.3%
Value $5.528M Shares 150,000 Est. Cost $34.94 Unrealized
FOLD AMICUS THERAPEUTICS INC 0.3%
Value $5.401M Shares 757,500 Est. Cost $10.68 Unrealized -40.8%
LGND LIGAND PHARMACEUTICALS INC 0.3%
Value $5.292M Shares 50,000 Est. Cost $72.69 Unrealized -9.5%
KITE PHARMA INC 0.3%
Value $5.259M Shares 67,000 Est. Cost $46.24 Unrealized
ADAPY ADAPTIMMUNE THERAPEUTICS PLC 0.3%
Value $4.821M Shares 875,000 Est. Cost $15.34 Unrealized
MEDICINES CO 0.3%
Value $4.744M Shares 3,000,000 Est. Cost $1.14 Unrealized
1741046D STERIS PLC 0.3%
Value $4.515M Shares 65,000 Est. Cost $68.22 Unrealized
ADURO BIOTECH INC 0.3%
Value $4.461M Shares 415,000 Est. Cost $28.61 Unrealized
JUNO THERAPEUTICS INC 0.3%
Value $4.371M Shares 197,001 Est. Cost $52.64 Unrealized
NOVADAQ TECHNOLOGIES INC 0.2%
Value $4.323M Shares 555,000 Est. Cost $14.29 Unrealized
AGN 5.5 03/01/18 A ALLERGAN PLC 0.2%
Value $4.242M Shares 5,000 Est. Cost $1045.60 Unrealized
MGNX MACROGENICS INC 0.2%
Value $4.185M Shares 225,000 Est. Cost $32.43 Unrealized -40.5%
AEGLEA BIOTHERAPEUTICS INC 0.2%
Value $3.904M Shares 524,089 Est. Cost $4.86 Unrealized
EXEL EXELIXIS INC 0.2%
Value $3.792M Shares 175,000 Est. Cost $11.85 Unrealized +71.7%
ALDER BIOPHARMACEUTICALS INC 0.2%
Value $3.786M Shares 182,000 Est. Cost $24.71 Unrealized
CARDIOME PHARMA CORP 0.2%
Value $3.612M Shares 1,200,000 Est. Cost $8.88 Unrealized
CGEN COMPUGEN LTD 0.2%
Value $3.548M Shares 825,000 Est. Cost $6.07 Unrealized -23.9%
PROTEOSTASIS THERAPEUTICS IN 0.2%
Value $3.519M Shares 450,000 Est. Cost $10.10 Unrealized
PBYI PUMA BIOTECHNOLOGY INC 0.2%
Value $3.515M Shares 94,500 Est. Cost $61.37 Unrealized -40.5%
MDGL MADRIGAL PHARMACEUTICALS INC 0.2%
Value $3.465M Shares 225,000 Est. Cost $14.21 Unrealized +10.7%
RIGEL PHARMACEUTICALS INC 0.2%
Value $3.31M Shares 1,000,000 Est. Cost $2.73 Unrealized
INVA INNOVIVA INC 0.2%
Value $3.25M Shares 235,000 Est. Cost $11.83 Unrealized -0.5%
GKOS GLAUKOS CORP 0.2%
Value $3.206M Shares 62,500 Est. Cost $43.59 Unrealized 0.0%
HILL ROM HLDGS INC 0.2%
Value $3.177M Shares 45,000 Est. Cost $50.45 Unrealized
INTRA CELLULAR THERAPIES INC 0.2%
Value $3.088M Shares 190,000 Est. Cost $39.54 Unrealized
GENOCEA BIOSCIENCES INC 0.2%
Value $2.923M Shares 480,000 Est. Cost $6.85 Unrealized
BLUEBIRD BIO INC 0.2%
Value $2.772M Shares 30,500 Est. Cost $105.64 Unrealized
CARA THERAPEUTICS INC 0.2%
Value $2.759M Shares 150,000 Est. Cost $18.39 Unrealized
ZBH ZIMMER BIOMET HLDGS INC 0.1%
Value $2.577M Shares 21,100 Est. Cost $99.44 Unrealized +6.0%
OTONOMY INC 0.1%
Value $2.573M Shares 210,000 Est. Cost $21.56 Unrealized
DBV TECHNOLOGIES S A 0.1%
Value $2.571M Shares 73,000 Est. Cost $33.59 Unrealized
SERES THERAPEUTICS INC 0.1%
Value $2.479M Shares 220,000 Est. Cost $38.95 Unrealized
CIDARA THERAPEUTICS INC 0.1%
Value $2.34M Shares 300,000 Est. Cost $13.32 Unrealized
NEURODERM LTD 0.1%
Value $2.232M Shares 84,079 Est. Cost $26.55 Unrealized
HQY HEALTHEQUITY INC 0.1%
Value $2.123M Shares 50,000 Est. Cost $38.65 Unrealized +14.5%
SCYNEXIS INC 0.1%
Value $2.098M Shares 760,000 Est. Cost $6.72 Unrealized
THERAVANCE BIOPHARMA INC 0.1%
Value $1.899M Shares 1,500,000 Est. Cost $1.14 Unrealized
MYOVANT SCIENCES LTD 0.1%
Value $1.761M Shares 150,000 Est. Cost $12.16 Unrealized
NIVALIS THERAPEUTICS INC 0.1%
Value $1.752M Shares 600,000 Est. Cost $12.89 Unrealized
NVCR NOVOCURE LTD 0.1%
Value $1.736M Shares 214,316 Est. Cost $23.86 Unrealized -69.7%
ATYR PHARMA INC 0.1%
Value $1.663M Shares 475,000 Est. Cost $16.05 Unrealized
NEWLINK GENETICS CORP 0.1%
Value $1.616M Shares 67,071 Est. Cost $24.09 Unrealized
EGALET CORP 0.1%
Value $1.53M Shares 300,000 Est. Cost $13.18 Unrealized
WRIGHT MED GROUP INC 0.1%
Value $1.198M Shares 1,000,000 Est. Cost $0.90 Unrealized
NOVAVAX INC 0.1%
Value $1.05M Shares 820,000 Est. Cost $5.52 Unrealized
PRGO PERRIGO CO PLC 0.1%
Value $1.036M Shares 15,600 Est. Cost $116.16 Unrealized -34.5%
DYNAVAX TECHNOLOGIES CORP 0.1%
Value $982K Shares 165,000 Est. Cost $24.06 Unrealized
INFIQ INFINITY PHARMACEUTICALS INC 0.1%
Value $872K Shares 270,000 Est. Cost $11.28 Unrealized -78.2%
CHIASMA INC 0.0%
Value $837K Shares 492,500 Est. Cost $19.77 Unrealized
VALEANT PHARMACEUTICALS INTL 0.0%
Value $732K Shares 66,400 Est. Cost $162.66 Unrealized
TANDEM DIABETES CARE INC 0.0%
Value $714K Shares 595,000 Est. Cost $13.40 Unrealized
OREXIGEN THERAPEUTICS INC 0.0%
Value $569K Shares 165,300 Est. Cost $3.32 Unrealized
ANTHERA PHARMACEUTICALS INC 0.0%
Value $552K Shares 1,296,568 Est. Cost $1.67 Unrealized
CERULEAN PHARMA INC 0.0%
Value $508K Shares 625,000 Est. Cost $5.94 Unrealized
DIMENSION THERAPEUTICS INC 0.0%
Value $475K Shares 271,370 Est. Cost $11.28 Unrealized