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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 (2016Q3)
Portfolio Summary: 137 holdings with a total value of $1,595,270,000.
#
Name
Shares
Value ($)
%
Options
Notes
1 TESARO INC 626,500 62,800,000 3.94%
2 AETNA INC NEW 440,100 50,810,000 3.19%
3 RADIUS HEALTH 892,000 48,248,000 3.02%
4 ACADIA HEALTHCARE COMPANY IN 924,678 45,818,000 2.87%
5 GW PHARMACEUTICALS PLC 325,000 43,137,000 2.70%
6 ALLERGAN PLC 186,000 42,838,000 2.69%
7 SPARK THERAPEUTICS INC 625,000 37,538,000 2.35%
8 MERCK & CO INC 587,500 36,666,000 2.30%
9 PFIZER INC 1,055,800 35,760,000 2.24%
10 ADVANCED ACCELERATOR APPLIC 930,000 35,414,000 2.22%
11 ALEXION PHARMACEUTIC 267,250 32,749,000 2.05%
12 INTUITIVE SURGICAL INC 45,000 32,617,000 2.04%
13 HCA HOLDINGS INC 430,000 32,521,000 2.04%
14 CIGNA CORPORATION 228,500 29,778,000 1.87%
15 COLLEGIUM PHARMACEUTICAL INC COM 1,545,000 29,757,000 1.87%
16 WELLCARE HEALTH PLANS INC COM 234,500 27,458,000 1.72%
17 GILEAD SCIENCES INC 344,000 27,217,000 1.71%
18 CELGENE CORP 254,500 26,603,000 1.67%
19 ACLARIS THERAPEUTICS INC COM 1,016,000 26,020,000 1.63%
20 MEDICINES CO 681,000 25,701,000 1.61%
21 SHIRE PLC 132,500 25,686,000 1.61%
22 ARDELYX INC COM 1,975,000 25,557,000 1.60%
23 LILLY ELI & CO 276,000 22,152,000 1.39%
24 Theravance Biopharma Inc 600,000 21,744,000 1.36%
25 Clearside Biomedical Inc 1,225,000 21,254,000 1.33%
26 NEUROCRINE BIOSCIE COM USD0.001 410,000 20,762,000 1.30%
27 PENUMBRA INC COM 266,500 20,251,000 1.27%
28 PROTHENA CORP PLC 308,000 18,471,000 1.16%
29 BIOGEN INC 58,000 18,156,000 1.14%
30 PACIRA BIOSCIENCES INC 504,000 17,247,000 1.08%
31 AMARIN CORP PLC 4,955,746 15,809,000 0.99%
32 AMGEN INC 94,000 15,680,000 0.98%
33 Wright Medical Group NV 613,000 15,037,000 0.94%
34 INCYTE 156,500 14,756,000 0.92%
35 PRA HEALTH SCIENCES INC 253,000 14,297,000 0.90%
36 MCKESSON CORP 82,000 13,674,000 0.86%
37 GALAPAGOS NV 210,000 13,579,000 0.85%
38 BRISTOL MYERS SQUIBB CO 250,000 13,480,000 0.84%
39 JAZZ PHARMACEUTICALS PLC SHS USD 107,000 12,998,000 0.81%
40 WALGREENS BOOTS ALLIANCE INC 161,000 12,980,000 0.81%
41 DANAHER CORP DEL 160,000 12,542,000 0.79%
42 COHERUS BIOSCIENCES INC COM 467,500 12,520,000 0.78%
43 EDWARDS LIFESCIENCES CORP 103,250 12,448,000 0.78%
44 THERAPEUTICSMD INC 1,800,000 12,258,000 0.77%
45 DERMIRA INC 355,000 12,006,000 0.75%
46 PATHEON N V SHS 400,000 11,852,000 0.74%
47 RETROPHIN INC COM 522,000 11,682,000 0.73%
48 BIOMARIN 125,000 11,565,000 0.72%
49 HealthSouth Corp 265,000 10,751,000 0.67%
50 ACHILLION PHARMACEUTICALS INC COM 1,316,000 10,660,000 0.67%
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Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0001172661-16-004294, filed 2016.11.14).

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.