Rock Springs Capital Management LP Diversified Active

Location: Baltimore, MD

CIK: 0001595725 · Show all filings

Period: Q4 2017 (← Previous) (Next →)

Filing Date: Feb 14, 2018

Total Value: $2.204B (99.3% shares, 0.7% debt)

Holdings (145)

UNH UNITEDHEALTH GROUP INC 4.9%
Value $107M Shares 487,000 Est. Cost $151.47 Unrealized +22.8%
ADVANCED ACCELERATOR APPLIC 3.1%
Value $67.38M Shares 825,500 Est. Cost $33.80 Unrealized
CIGNA CORPORATION 3.0%
Value $65.19M Shares 321,000 Est. Cost $131.82 Unrealized
ALEXION PHARMACEUTICALS INC 2.6%
Value $57.4M Shares 480,000 Est. Cost $139.06 Unrealized
ISRG INTUITIVE SURGICAL INC 2.4%
Value $52.52M Shares 143,900 Est. Cost $101.20 Unrealized +23.7%
PCRX PACIRA PHARMACEUTICALS INC 2.3%
Value $50.52M Shares 1,106,700 Est. Cost $48.85 Unrealized -18.9%
MRK MERCK & CO INC 2.2%
Value $47.87M Shares 850,700 Est. Cost $43.75 Unrealized -1.7%
GW PHARMACEUTICALS PLC 2.1%
Value $46.73M Shares 354,000 Est. Cost $94.73 Unrealized
TESARO INC 2.1%
Value $45.45M Shares 548,500 Est. Cost $65.66 Unrealized
PRA HEALTH SCIENCES INC 2.0%
Value $43.49M Shares 477,500 Est. Cost $42.95 Unrealized
MOH MOLINA HEALTHCARE INC 2.0%
Value $43.48M Shares 567,000 Est. Cost $65.17 Unrealized +10.8%
AETNA INC NEW 2.0%
Value $43.11M Shares 239,000 Est. Cost $124.56 Unrealized
ACHC ACADIA HEALTHCARE COMPANY IN 1.9%
Value $40.9M Shares 1,253,500 Est. Cost $55.43 Unrealized -37.5%
NBIX NEUROCRINE BIOSCIENCES INC 1.7%
Value $37.71M Shares 486,000 Est. Cost $26.29 Unrealized +159.5%
PBYI PUMA BIOTECHNOLOGY INC 1.7%
Value $36.92M Shares 373,500 Est. Cost $78.12 Unrealized +43.2%
COLL COLLEGIUM PHARMACEUTICAL INC 1.6%
Value $34.81M Shares 1,885,729 Est. Cost $15.83 Unrealized -9.5%
SPARK THERAPEUTICS INC 1.4%
Value $31.62M Shares 615,000 Est. Cost $58.09 Unrealized
CELGENE CORP 1.4%
Value $31.62M Shares 303,000 Est. Cost $118.21 Unrealized
MDGL MADRIGAL PHARMACEUTICALS INC 1.4%
Value $31.39M Shares 342,000 Est. Cost $23.28 Unrealized +145.3%
RADIUS HEALTH INC 1.4%
Value $29.96M Shares 943,000 Est. Cost $44.43 Unrealized
PEN PENUMBRA INC 1.3%
Value $29.22M Shares 310,500 Est. Cost $48.06 Unrealized +106.4%
JNJ JOHNSON & JOHNSON 1.3%
Value $27.94M Shares 200,000 Est. Cost $95.59 Unrealized +16.1%
WELLCARE HEALTH PLANS INC 1.2%
Value $26.95M Shares 134,000 Est. Cost $79.73 Unrealized
LOXO ONCOLOGY INC 1.2%
Value $26.1M Shares 310,000 Est. Cost $58.45 Unrealized
ONC BEIGENE LTD 1.2%
Value $25.99M Shares 266,000 Est. Cost $33.43 Unrealized
VRTX VERTEX PHARMACEUTICALS INC 1.2%
Value $25.66M Shares 171,250 Est. Cost $109.03 Unrealized +35.8%
EXAS EXACT SCIENCES CORP 1.0%
Value $22.85M Shares 434,900 Est. Cost $20.61 Unrealized +159.1%
TFX TELEFLEX INC 1.0%
Value $22.83M Shares 91,750 Est. Cost $239.92 Unrealized 0.0%
IRTC IRHYTHM TECHNOLOGIES INC 1.0%
Value $22.76M Shares 406,000 Est. Cost $45.62 Unrealized +14.6%
GILD GILEAD SCIENCES INC 1.0%
Value $22.45M Shares 313,400 Est. Cost $54.83 Unrealized +2.0%
MERSANA THERAPEUTICS INC 1.0%
Value $21.8M Shares 1,326,800 Est. Cost $13.97 Unrealized
EW EDWARDS LIFESCIENCES CORP 1.0%
Value $21.41M Shares 190,001 Est. Cost $31.99 Unrealized +14.7%
TMO THERMO FISHER SCIENTIFIC INC 0.9%
Value $20.89M Shares 110,000 Est. Cost $164.09 Unrealized +14.2%
ASSEMBLY BIOSCIENCES INC 0.9%
Value $20.36M Shares 450,000 Est. Cost $16.69 Unrealized
SYK STRYKER CORP 0.9%
Value $19.59M Shares 126,500 Est. Cost $139.59 Unrealized 0.0%
AVEXIS INC 0.9%
Value $19.37M Shares 175,000 Est. Cost $38.23 Unrealized
INSM INSMED INC 0.9%
Value $19.13M Shares 613,500 Est. Cost $17.46 Unrealized +69.2%
MEDICINES CO 0.9%
Value $18.86M Shares 690,000 Est. Cost $33.00 Unrealized
WTW WILLIS TOWERS WATSON PUB LTD 0.8%
Value $18.54M Shares 123,000 Est. Cost $112.37 Unrealized +25.5%
TBPH THERAVANCE BIOPHARMA INC 0.8%
Value $18.2M Shares 652,600 Est. Cost $20.11 Unrealized +47.2%
GLPG GALAPAGOS NV 0.8%
Value $17.35M Shares 185,000 Est. Cost $50.00 Unrealized
INCY INCYTE CORP 0.8%
Value $17.29M Shares 182,500 Est. Cost $67.79 Unrealized +54.2%
BIIB BIOGEN INC 0.8%
Value $16.88M Shares 53,000 Est. Cost $273.10 Unrealized +17.5%
JAZZ JAZZ PHARMACEUTICALS PLC 0.8%
Value $16.66M Shares 123,700 Est. Cost $146.27 Unrealized -5.2%
EPIZYME INC 0.8%
Value $16.63M Shares 1,325,000 Est. Cost $16.49 Unrealized
ALNY ALNYLAM PHARMACEUTICALS INC 0.7%
Value $16.52M Shares 130,000 Est. Cost $75.78 Unrealized +65.8%
AUDENTES THERAPEUTICS INC 0.7%
Value $16.41M Shares 525,000 Est. Cost $18.00 Unrealized
AMARIN CORP PLC 0.7%
Value $15.84M Shares 3,950,000 Est. Cost $3.19 Unrealized
PORTOLA PHARMACEUTICALS INC 0.7%
Value $15.76M Shares 323,800 Est. Cost $54.95 Unrealized
CLOVIS ONCOLOGY INC 0.7%
Value $15.74M Shares 231,500 Est. Cost $56.13 Unrealized
WRIGHT MED GROUP N V 0.7%
Value $15.54M Shares 700,000 Est. Cost $23.10 Unrealized
FIBROGEN INC 0.7%
Value $15.4M Shares 325,000 Est. Cost $29.90 Unrealized
ARDX ARDELYX INC 0.7%
Value $15.02M Shares 2,275,557 Est. Cost $10.47 Unrealized -43.4%
BAX BAXTER INTL INC 0.7%
Value $14.87M Shares 230,000 Est. Cost $49.09 Unrealized +13.6%
ALGN ALIGN TECHNOLOGY INC 0.7%
Value $14.83M Shares 66,750 Est. Cost $163.51 Unrealized +38.9%
ZBH ZIMMER BIOMET HLDGS INC 0.7%
Value $14.36M Shares 119,000 Est. Cost $104.66 Unrealized +1.1%
SRPT SAREPTA THERAPEUTICS INC 0.7%
Value $14.36M Shares 258,000 Est. Cost $32.85 Unrealized +61.3%
ANAB ANAPTYSBIO INC 0.7%
Value $14.34M Shares 142,400 Est. Cost $26.97 Unrealized +172.9%
HOLX HOLOGIC INC 0.6%
Value $14.32M Shares 335,000 Est. Cost $39.89 Unrealized 0.0%
AXGN AXOGEN INC 0.6%
Value $13.51M Shares 477,500 Est. Cost $15.30 Unrealized +54.2%
FOLD AMICUS THERAPEUTICS INC 0.6%
Value $13.1M Shares 910,000 Est. Cost $11.11 Unrealized +23.7%
HEALTHSOUTH CORP 0.6%
Value $13.09M Shares 265,000 Est. Cost $41.93 Unrealized
ALDER BIOPHARMACEUTICALS INC 0.5%
Value $12.08M Shares 1,055,000 Est. Cost $14.26 Unrealized
INVITAE CORP 0.5%
Value $11.86M Shares 1,306,000 Est. Cost $10.53 Unrealized
DERMIRA INC 0.5%
Value $11.68M Shares 420,000 Est. Cost $22.07 Unrealized
PRTA PROTHENA CORP PLC 0.5%
Value $11.62M Shares 310,000 Est. Cost $29.28 Unrealized +73.9%
ASND ASCENDIS PHARMA A S 0.5%
Value $11.22M Shares 280,000 Est. Cost $17.44 Unrealized
INTERSECT ENT INC 0.5%
Value $11.18M Shares 345,000 Est. Cost $25.70 Unrealized
BMRN BIOMARIN PHARMACEUTICAL INC 0.5%
Value $11.15M Shares 125,000 Est. Cost $100.37 Unrealized -13.4%
AIMMUNE THERAPEUTICS INC 0.5%
Value $11.08M Shares 293,000 Est. Cost $22.58 Unrealized
BLUEPRINT MEDICINES CORP 0.5%
Value $11.05M Shares 146,500 Est. Cost $72.02 Unrealized
JUNO THERAPEUTICS INC 0.5%
Value $10.51M Shares 230,000 Est. Cost $49.72 Unrealized
ODONATE THERAPEUTICS INC 0.5%
Value $10.25M Shares 410,000 Est. Cost $25.00 Unrealized
ACRS ACLARIS THERAPEUTICS INC 0.5%
Value $10.23M Shares 415,000 Est. Cost $19.88 Unrealized +22.5%
RIGEL PHARMACEUTICALS INC 0.4%
Value $9.603M Shares 2,475,000 Est. Cost $3.42 Unrealized
INGN INOGEN INC 0.4%
Value $9.526M Shares 80,000 Est. Cost $110.11 Unrealized 0.0%
FIVE PRIME THERAPEUTICS INC 0.4%
Value $9.316M Shares 425,000 Est. Cost $25.44 Unrealized
HQY HEALTHEQUITY INC 0.4%
Value $9.099M Shares 195,000 Est. Cost $44.98 Unrealized +10.1%
ZOGENIX INC 0.4%
Value $9.031M Shares 225,500 Est. Cost $37.83 Unrealized
CHINA CORD BLOOD CORP 0.4%
Value $8.756M Shares 880,000 Est. Cost $4.24 Unrealized
RETROPHIN INC 0.4%
Value $8.428M Shares 400,000 Est. Cost $23.91 Unrealized
OBSEVA SA 0.4%
Value $8.198M Shares 840,000 Est. Cost $10.41 Unrealized
ALMOST FAMILY INC 0.4%
Value $8.166M Shares 147,540 Est. Cost $53.54 Unrealized
PARATEK PHARMACEUTICALS INC 0.4%
Value $8.055M Shares 450,000 Est. Cost $15.77 Unrealized
BLUEBIRD BIO INC 0.4%
Value $8.015M Shares 45,000 Est. Cost $123.84 Unrealized
RTI SURGICAL INC 0.4%
Value $7.995M Shares 1,950,000 Est. Cost $4.35 Unrealized
RARE ULTRAGENYX PHARMACEUTICAL IN 0.3%
Value $7.56M Shares 163,000 Est. Cost $61.79 Unrealized -20.6%
SAGE THERAPEUTICS INC 0.3%
Value $7.412M Shares 45,000 Est. Cost $90.75 Unrealized
ARENA PHARMACEUTICALS INC 0.3%
Value $7.304M Shares 215,000 Est. Cost $25.50 Unrealized
THERAPEUTICSMD INC 0.3%
Value $7.097M Shares 1,175,000 Est. Cost $7.12 Unrealized
SEATTLE GENETICS INC 0.3%
Value $6.688M Shares 125,000 Est. Cost $52.27 Unrealized
BIOHAVEN PHARMACTL HLDG CO L 0.3%
Value $6.583M Shares 244,000 Est. Cost $25.00 Unrealized
CLEMENTIA PHARMACEUTICALS IN 0.3%
Value $6.548M Shares 345,000 Est. Cost $16.89 Unrealized
CLEARSIDE BIOMEDICAL INC 0.3%
Value $6.545M Shares 935,000 Est. Cost $7.01 Unrealized
ACHILLION PHARMACEUTICALS IN 0.3%
Value $6.48M Shares 2,250,000 Est. Cost $7.47 Unrealized
1741046D STERIS PLC 0.3%
Value $6.473M Shares 74,000 Est. Cost $69.98 Unrealized
ZLAB ZAI LAB LTD 0.3%
Value $6.263M Shares 295,000 Est. Cost $27.00 Unrealized
ABLYNX NV 0.3%
Value $6.248M Shares 250,000 Est. Cost $24.99 Unrealized
SPRO SPERO THERAPEUTICS INC 0.3%
Value $6.169M Shares 525,000 Est. Cost $12.27 Unrealized 0.0%
TETRAPHASE PHARMACEUTICALS I 0.3%
Value $5.985M Shares 950,000 Est. Cost $6.12 Unrealized
GLOBAL BLOOD THERAPEUTICS IN 0.3%
Value $5.903M Shares 150,000 Est. Cost $34.94 Unrealized
ADAPY ADAPTIMMUNE THERAPEUTICS PLC 0.3%
Value $5.845M Shares 875,000 Est. Cost $15.34 Unrealized
DVA DAVITA INC 0.3%
Value $5.787M Shares 80,100 Est. Cost $61.54 Unrealized 0.0%
CHRS COHERUS BIOSCIENCES INC 0.3%
Value $5.54M Shares 629,500 Est. Cost $22.39 Unrealized -52.2%
EXEL EXELIXIS INC 0.2%
Value $5.32M Shares 175,000 Est. Cost $11.85 Unrealized +124.6%
MERUS N V 0.2%
Value $5.276M Shares 271,952 Est. Cost $9.33 Unrealized
RA PHARMACEUTICALS INC 0.2%
Value $5.1M Shares 600,000 Est. Cost $15.19 Unrealized
MEDICINES CO 0.2%
Value $4.597M Shares 5,000,000 Est. Cost $1.05 Unrealized
HRTX HERON THERAPEUTICS INC 0.2%
Value $4.525M Shares 250,000 Est. Cost $16.31 Unrealized 0.0%
CRVS CORVUS PHARMACEUTICALS INC 0.2%
Value $4.378M Shares 422,600 Est. Cost $14.35 Unrealized -10.8%
MGNX MACROGENICS INC 0.2%
Value $4.275M Shares 225,000 Est. Cost $32.43 Unrealized -42.4%
G1 THERAPEUTICS INC 0.2%
Value $4.256M Shares 214,500 Est. Cost $17.44 Unrealized
CYMABAY THERAPEUTICS INC 0.2%
Value $4.14M Shares 450,000 Est. Cost $8.06 Unrealized
BCRX BIOCRYST PHARMACEUTICALS 0.2%
Value $3.989M Shares 812,500 Est. Cost $5.00 Unrealized -3.1%
PROTEOSTASIS THERAPEUTICS IN 0.2%
Value $3.935M Shares 675,000 Est. Cost $8.68 Unrealized
EGALET CORP 0.2%
Value $3.754M Shares 7,800,000 Est. Cost $0.76 Unrealized
NABRIVA THERAPEUTICS PLC 0.2%
Value $3.738M Shares 625,000 Est. Cost $10.11 Unrealized
MYOVANT SCIENCES LTD 0.2%
Value $3.73M Shares 295,100 Est. Cost $13.79 Unrealized
IRWD IRONWOOD PHARMACEUTICALS INC 0.2%
Value $3.373M Shares 225,000 Est. Cost $13.68 Unrealized -4.5%
MIRATI THERAPEUTICS INC 0.1%
Value $3.285M Shares 180,000 Est. Cost $18.25 Unrealized
DYNAVAX TECHNOLOGIES CORP 0.1%
Value $3.273M Shares 175,000 Est. Cost $23.75 Unrealized
MEDICINES CO 0.1%
Value $3.171M Shares 3,000,000 Est. Cost $1.14 Unrealized
ADURO BIOTECH INC 0.1%
Value $3.113M Shares 415,000 Est. Cost $28.61 Unrealized
BMY BRISTOL MYERS SQUIBB CO 0.1%
Value $3.064M Shares 50,000 Est. Cost $42.96 Unrealized +8.1%
AGN 5.5 03/01/18 A ALLERGAN PLC 0.1%
Value $2.934M Shares 5,000 Est. Cost $1045.60 Unrealized
AEGLEA BIOTHERAPEUTICS INC 0.1%
Value $2.835M Shares 524,089 Est. Cost $4.86 Unrealized
INTRA CELLULAR THERAPIES INC 0.1%
Value $2.715M Shares 187,500 Est. Cost $39.54 Unrealized
NOVAVAX INC 0.1%
Value $2.48M Shares 2,000,000 Est. Cost $2.99 Unrealized
SERES THERAPEUTICS INC 0.1%
Value $2.231M Shares 220,000 Est. Cost $38.95 Unrealized
RYTM RHYTHM PHARMACEUTICALS INC 0.1%
Value $2.078M Shares 71,500 Est. Cost $26.40 Unrealized 0.0%
CGEN COMPUGEN LTD 0.1%
Value $2.063M Shares 825,000 Est. Cost $6.07 Unrealized -51.0%
CIDARA THERAPEUTICS INC 0.1%
Value $2.04M Shares 300,000 Est. Cost $13.32 Unrealized
CARDIOME PHARMA CORP 0.1%
Value $1.86M Shares 1,200,000 Est. Cost $8.88 Unrealized
DBV TECHNOLOGIES S A 0.1%
Value $1.796M Shares 73,000 Est. Cost $33.59 Unrealized
SCYNEXIS INC 0.1%
Value $1.763M Shares 760,000 Est. Cost $6.72 Unrealized
ALPINE IMMUNE SCIENCES INC 0.1%
Value $1.68M Shares 150,000 Est. Cost $11.60 Unrealized
ATYR PHARMA INC 0.1%
Value $1.663M Shares 475,000 Est. Cost $16.05 Unrealized
THERAVANCE BIOPHARMA INC 0.1%
Value $1.645M Shares 1,500,000 Est. Cost $1.14 Unrealized
RADIUS HEALTH INC 0.1%
Value $1.418M Shares 1,500,000 Est. Cost $1.01 Unrealized
WRIGHT MED GROUP INC 0.0%
Value $1.031M Shares 1,000,000 Est. Cost $0.90 Unrealized
PRTA PROTHENA CORP PLC 0.0%
Value $937K Shares 25,000 Est. Cost $29.28 Unrealized +73.9%
CHIASMA INC 0.0%
Value $893K Shares 525,000 Est. Cost $18.65 Unrealized
INFIQ INFINITY PHARMACEUTICALS INC 0.0%
Value $548K Shares 270,000 Est. Cost $11.28 Unrealized -81.6%
OREXIGEN THERAPEUTICS INC 0.0%
Value $213K Shares 165,300 Est. Cost $3.32 Unrealized
DARE BIOSCIENCE INC 0.0%
Value $135K Shares 62,500 Est. Cost $3.12 Unrealized