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Institutional Investment Manager
Rock Springs Capital Management LP
Rock Springs Capital Management LP (CIK: 0001595725) incorporated in Delaware, located at 650 South Exeter Street, Baltimore, MD. Institutional holdings reported to the SEC.

Institutional Holdings (2015Q1)
Portfolio Summary: 105 holdings with a total value of $1,069,136,000.
#
Name
Shares
Value ($)
%
Options
Notes
51 JUNO THERAPEUTICS INC COM 122,426 7,426,000 0.69%
52 RELYPSA INC 205,000 7,394,000 0.69%
53 DAVITA INC 90,000 7,315,000 0.68%
54 ADVAXIS INC COM NEW 490,000 7,076,000 0.66%
55 ZS PHARMA INC 158,000 6,649,000 0.62%
56 Wuxi Pharmatech Inc ADR 168,000 6,515,000 0.61%
57 Theravance Biopharma Inc 374,000 6,489,000 0.61%
58 GW PHARMACEUTICALS PLC 70,000 6,379,000 0.60%
59 CONNECTURE INC 600,000 6,210,000 0.58%
60 STERIS PLC 88,000 6,184,000 0.58%
61 COHERUS BIOSCIENCES INC COM 199,051 6,087,000 0.57%
62 NOVAVAX INC COM 730,000 6,037,000 0.56%
63 TANDEM DIABETES CARE INC COM 475,800 6,005,000 0.56%
64 ACHILLION PHARMACEUTICALS IN 600,000 5,916,000 0.55%
65 KYTHERA BIOPHARMACEUTICALS I 115,000 5,767,000 0.54%
66 EPIZYME INC COM 306,500 5,756,000 0.54%
67 PUMA BIOTECHNOLOGY 24,250 5,726,000 0.54%
68 ULTRAGENYX PHARMACEUTICAL INC COM 92,000 5,712,000 0.53%
69 WELLCARE HEALTH PLANS INC 60,000 5,488,000 0.51%
70 CARDIOME PHARMA CORP 565,000 5,232,000 0.49%
71 ALLERGAN PLC 5,000 5,150,000 0.48%
72 CERULEAN PHARMA INC 540,000 4,865,000 0.46%
73 FIBROGEN INC 151,300 4,748,000 0.44%
74 AERIE PHARMACEUTICALS INC COM 146,000 4,576,000 0.43%
75 REGENERON PHARMACEUTICALS 10,000 4,515,000 0.42%
76 PACIRA PHARMACEUTICALS INC 50,750 4,509,000 0.42%
77 JAZZ PHARMACEUTICALS PLC 26,000 4,493,000 0.42%
78 ILLUMINA INC 24,000 4,455,000 0.42%
79 CERNER CORP 60,000 4,396,000 0.41%
80 CHINA CORD BLOOD CORP 830,000 4,241,000 0.40%
81 ASSEMBLY BIOSCIENCES INC 317,500 4,204,000 0.39%
82 KITE PHARMA INCORPORATED 71,474 4,123,000 0.39%
83 CASTLIGHT HEALTH INC COM CL B 525,000 4,074,000 0.38%
84 BIOMARIN PHARMACEUTICAL INC 32,500 4,050,000 0.38%
85 TETRAPHASE PHARMACEUTICALS INC COM 102,500 3,756,000 0.35%
86 MACROGENICS INC 116,500 3,655,000 0.34%
87 FIVE PRIME THERAPEUTICS INC 136,000 3,108,000 0.29%
88 BLUEBIRD BIO INC COM 25,000 3,019,000 0.28%
89 INFINITY PHARMACEUTICALS INC 215,000 3,006,000 0.28%
90 AVALANCHE BIOTECHNOLOGIES IN 70,500 2,857,000 0.27%
91 BENEFITFOCUS INC 75,000 2,759,000 0.26%
92 CELLECTIS S A 75,000 2,594,000 0.24%
93 SPARK THERAPEUTICS INCORPORATED 33,106 2,566,000 0.24%
94 PTC THERAPEUTICS INC 40,500 2,464,000 0.23%
95 XENOPORT INC 310,000 2,207,000 0.21%
96 INVITAE CORP 125,000 2,095,000 0.20%
97 TRIVASCULAR TECHNOLOGIES INC 198,000 2,077,000 0.19%
98 KINDRED BIOSCIENCES INC 275,000 1,964,000 0.18%
99 ANTHERA PHARMACEUTICALS I 425,000 1,900,000 0.18%
100 RAPTOR PHARMACEUTICAL CORP 155,000 1,685,000 0.16%
Page 2 of 3

Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0001172661-15-001184, filed 2015.05.15).

From 2023-01-03 onward, the SEC requires values to be reported in nearest dollars. Earlier filings reported values in thousands; therefore, positions shown as $0 in older filings may represent actual values between $0–$999.