Dark
Light
System
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 (2015Q2)
Portfolio Summary: 117 holdings with a total value of $1,369,933,000.
#
Name
Shares
Value ($)
%
Options
Notes
101 ENVISION HEALTHCARE HLDGS INC 570,000 22,504,000 1.64%
102 CELGENE CORP 198,000 22,916,000 1.67%
103 THORATEC LABS CORP 532,500 23,734,000 1.73%
104 AMGEN INC 156,000 23,949,000 1.75%
105 HUMANA INC 131,500 25,153,000 1.84%
106 PFIZER INC 760,000 25,483,000 1.86%
107 ALEXION PHARMACEUTIC 154,500 27,929,000 2.04%
108 RADIUS HEALTH INCORPORATED COM NEW 429,000 29,043,000 2.12%
109 GILEAD SCIENCES INC 257,500 30,148,000 2.20%
110 SPARK THERAPEUTICS INCORPORATED 508,059 30,621,000 2.24%
111 MCKESSON CORP 149,500 33,609,000 2.45%
112 ALLERGAN PLC 121,500 36,870,000 2.69%
113 HCA HOLDINGS INC 422,500 38,329,000 2.80%
114 ACADIA COMPANY COM 511,750 40,085,000 2.93%
115 VALEANT PHARMACEUTICALS INTL 189,250 42,042,000 3.07%
116 MEDTRONIC PLC 570,000 42,237,000 3.08%
117 ABBVIE INC 746,423 50,152,000 3.66%
Page 3 of 3

Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0001172661-15-001627, filed 2015.08.14).

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.