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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 (2016Q4)
Portfolio Summary: 133 holdings with a total value of $1,494,403,000.
#
Name
Shares
Value ($)
%
Options
Notes
101 AMGEN INC 96,500 14,109,000 0.94%
102 PROTHENA CORP PLC 309,500 15,224,000 1.02%
103 Wright Medical Group NV 667,000 15,328,000 1.03%
104 AMARIN CORP PLC 4,991,500 15,374,000 1.03%
105 NEUROCRINE BIOSCIE COM USD0.001 410,000 15,867,000 1.06%
106 PRA HEALTH SCIENCES INC 300,000 16,536,000 1.11%
107 INCYTE CORP 169,000 16,946,000 1.13%
108 PENUMBRA INC COM 295,500 18,853,000 1.26%
109 Theravance Biopharma Inc 600,000 19,128,000 1.28%
110 GILEAD SCIENCES INC 276,500 19,800,000 1.32%
111 PACIRA PHARMACEUTICALS INC 713,000 23,030,000 1.54%
112 SHIRE PLC 137,200 23,376,000 1.56%
113 MEDICINES CO 699,500 23,741,000 1.59%
114 LILLY ELI & CO 325,000 23,904,000 1.60%
115 ADVANCED ACCELERATOR APPLIC 930,000 24,887,000 1.67%
116 COLLEGIUM PHARMACEUTICAL INC COM 1,600,000 24,912,000 1.67%
117 BRISTOL MYERS SQUIBB CO 450,000 26,298,000 1.76%
118 UNITEDHEALTH GROUP INC 165,000 26,407,000 1.77%
119 CELGENE CORP 242,500 28,069,000 1.88%
120 ARDELYX INC COM 2,000,000 28,400,000 1.90%
121 ACLARIS THERAPEUTICS INC COM 1,100,000 29,854,000 2.00%
122 INTUITIVE SURGICAL INC 48,000 30,440,000 2.04%
123 SPARK THERAPEUTICS INCORPORATED 625,000 31,188,000 2.09%
124 WELLCARE HEALTH PLANS INC 234,500 32,145,000 2.15%
125 CIGNA CORPORATION 252,000 33,614,000 2.25%
126 RADIUS HEALTH INCORPORATED COM NEW 910,250 34,617,000 2.32%
127 ALLERGAN PLC 166,000 34,862,000 2.33%
128 ACADIA COMPANY COM 1,157,500 38,313,000 2.56%
129 GW PHARMACEUTICALS PLC 356,000 39,783,000 2.66%
130 MERCK & CO INC 750,000 44,153,000 2.95%
131 AETNA INC NEW 441,000 54,688,000 3.66%
132 ALEXION PHARMACEUTIC 465,000 56,893,000 3.81%
133 TESARO INCORPORATED 613,500 82,503,000 5.52%
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Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0001172661-17-000700, filed 2017.02.14).

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.