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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 (2015Q4)
Portfolio Summary: 120 holdings with a total value of $1,319,729,000.
#
Name
Shares
Value ($)
%
Options
Notes
101 PACIRA PHARMACEUTICALS INC 260,000 19,965,000 1.51%
102 NEUROCRINE BIOSCIE COM USD0.001 377,500 21,355,000 1.62%
103 INTUITIVE SURGICAL INC 39,500 21,573,000 1.63%
104 LILLY ELI & CO 275,897 23,247,000 1.76%
105 MEDICINES CO 625,000 23,338,000 1.77%
106 ACLARIS THERAPEUTICS INC COM 896,154 24,142,000 1.83%
107 TEVA PHARMACEUTICAL INDS LTD 379,300 24,897,000 1.89%
108 ADVANCED ACCELERATOR APPLIC 800,000 25,016,000 1.90%
109 SPARK THERAPEUTICS INCORPORATED 560,000 25,374,000 1.92%
110 CELGENE CORP 230,000 27,545,000 2.09%
111 COLLEGIUM PHARMACEUTICAL INC COM 1,005,487 27,651,000 2.10%
112 HCA HOLDINGS INC 430,000 29,081,000 2.20%
113 PFIZER INC 975,000 31,473,000 2.38%
114 BAXALTA INC COM 810,000 31,614,000 2.40%
115 GILEAD SCIENCES INC 325,300 32,917,000 2.49%
116 RADIUS HEALTH INCORPORATED COM NEW 597,500 36,770,000 2.79%
117 ALEXION PHARMACEUTIC 193,000 36,815,000 2.79%
118 ACADIA COMPANY COM 675,000 42,161,000 3.19%
119 AETNA INC NEW 411,000 44,437,000 3.37%
120 ALLERGAN PLC 162,000 50,625,000 3.84%
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Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0001172661-16-002886, filed 2016.02.16).

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.