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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
1 ALLERGAN PLC 162,000 50,625,000 3.84%
2 AETNA INC NEW 411,000 44,437,000 3.37%
3 ACADIA HEALTHCARE COMPANY IN 675,000 42,161,000 3.19%
4 ALEXION PHARMACEUTIC 193,000 36,815,000 2.79%
5 RADIUS HEALTH 597,500 36,770,000 2.79%
6 GILEAD SCIENCES INC 325,300 32,917,000 2.49%
7 BAXALTA INC 810,000 31,614,000 2.40%
8 PFIZER INC 975,000 31,473,000 2.38%
9 HCA HOLDINGS INC 430,000 29,081,000 2.20%
10 COLLEGIUM PHARMACEUTICAL INC COM 1,005,487 27,651,000 2.10%
11 CELGENE CORP 230,000 27,545,000 2.09%
12 SPARK THERAPEUTICS INC 560,000 25,374,000 1.92%
13 ADVANCED ACCELERATOR APPLIC 800,000 25,016,000 1.90%
14 TEVA PHARMACEUTICAL INDS LTD 379,300 24,897,000 1.89%
15 ACLARIS THERAPEUTICS INC COM 896,154 24,142,000 1.83%
16 MEDICINES CO 625,000 23,338,000 1.77%
17 LILLY ELI & CO 275,897 23,247,000 1.76%
18 INTUITIVE SURGICAL INC 39,500 21,573,000 1.63%
19 NEUROCRINE BIOSCIE COM USD0.001 377,500 21,355,000 1.62%
20 PACIRA BIOSCIENCES INC 260,000 19,965,000 1.51%
21 CIGNA CORPORATION 122,000 17,852,000 1.35%
22 TESARO INC 334,000 17,475,000 1.32%
23 PROTHENA CORP PLC 248,000 16,891,000 1.28%
24 ANTHEM INC 120,800 16,844,000 1.28%
25 WELLCARE HEALTH PLANS INC COM 214,500 16,776,000 1.27%
26 BIOGEN INC 50,650 15,517,000 1.18%
27 MCKESSON CORP 72,500 14,299,000 1.08%
28 THERMO FISHER SCIENTIFIC INC 100,000 14,185,000 1.07%
29 MEDNAX INC 193,000 13,830,000 1.05%
30 INCYTE 127,000 13,773,000 1.04%
31 GALAPAGOS NV 210,000 13,205,000 1.00%
32 AMGEN INC 80,900 13,132,000 1.00%
33 RETROPHIN INC COM 675,000 13,021,000 0.99%
34 ARDELYX INC COM 682,500 12,367,000 0.94%
35 THERAPEUTICSMD INC 1,185,000 12,288,000 0.93%
36 ACHILLION PHARMACEUTICALS INC COM 1,105,000 11,923,000 0.90%
37 ULTRAGENYX PHARMACEUTICAL INC COM 105,500 11,835,000 0.90%
38 ADURO BIOTECH 415,000 11,678,000 0.88%
39 PRA HEALTH SCIENCES INC 253,000 11,453,000 0.87%
40 JAZZ PHARMACEUTICALS PLC SHS USD 80,300 11,287,000 0.86%
41 PENUMBRA INC COM 205,000 11,031,000 0.84%
42 Wright Medical Group NV 456,000 11,026,000 0.84%
43 Theravance Biopharma Inc 645,000 10,572,000 0.80%
44 DERMIRA INC 290,000 10,037,000 0.76%
45 INSYS THERAPEUTICS INC NEW COM NEW 338,500 9,691,000 0.73%
46 INTRA CELLULAR THERAPIES INC COM 180,000 9,682,000 0.73%
47 CARDIOME PHARMA CORP 1,190,000 9,651,000 0.73%
48 CHIASMA INC 487,500 9,540,000 0.72%
49 IDEXX LAB 127,500 9,297,000 0.70%
50 ADAPTIMMUNE THERAPEUTICS PLC 765,001 9,226,000 0.70%
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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.