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 (2016Q2)
Portfolio Summary: 137 holdings with a total value of $1,350,771,000.
#
Name
Shares
Value ($)
%
Options
Notes
1 AETNA INC NEW 440,100 53,749,000 3.98%
2 ACADIA HEALTHCARE COMPANY IN 837,000 46,370,000 3.43%
3 ALLERGAN PLC 181,100 41,850,000 3.10%
4 TESARO INC 480,000 40,344,000 2.99%
5 PFIZER INC 1,055,800 37,175,000 2.75%
6 HCA HOLDINGS INC 430,000 33,114,000 2.45%
7 RADIUS HEALTH 867,500 31,881,000 2.36%
8 SPARK THERAPEUTICS INC 610,000 31,189,000 2.31%
9 INTUITIVE SURGICAL INC 44,000 29,102,000 2.15%
10 GILEAD SCIENCES INC 343,700 28,671,000 2.12%
11 ADVANCED ACCELERATOR APPLIC 921,000 27,846,000 2.06%
12 ALEXION PHARMACEUTIC 235,500 27,497,000 2.04%
13 CIGNA CORPORATION 206,800 26,468,000 1.96%
14 WELLCARE HEALTH PLANS INC COM 234,500 25,157,000 1.86%
15 CELGENE CORP 254,500 25,101,000 1.86%
16 GW PHARMACEUTICALS PLC 270,000 24,724,000 1.83%
17 MEDICINES CO 680,500 22,885,000 1.69%
18 SHIRE PLC 120,042 22,097,000 1.64%
19 LILLY ELI & CO 276,000 21,735,000 1.61%
20 TEVA PHARMACEUTICAL INDS LTD 395,000 19,841,000 1.47%
21 NEUROCRINE BIOSCIE COM USD0.001 409,500 18,612,000 1.38%
22 ACLARIS THERAPEUTICS INC COM 1,000,000 18,470,000 1.37%
23 Heartware International, Inc. 311,000 17,960,000 1.33%
24 PACIRA BIOSCIENCES INC 472,500 15,937,000 1.18%
25 Theravance Biopharma Inc 700,000 15,883,000 1.18%
26 THERMO FISHER SCIENTIFIC INC 100,200 14,806,000 1.10%
27 MCKESSON CORP 77,900 14,540,000 1.08%
28 BRISTOL MYERS SQUIBB CO 196,500 14,453,000 1.07%
29 PENUMBRA INC COM 242,500 14,429,000 1.07%
30 JAZZ PHARMACEUTICALS PLC SHS USD 102,000 14,414,000 1.07%
31 COLLEGIUM PHARMACEUTICAL INC COM 1,215,000 14,398,000 1.07%
32 AMGEN INC 94,000 14,302,000 1.06%
33 MEDNAX INC 195,000 14,124,000 1.05%
34 BIOGEN INC 57,650 13,941,000 1.03%
35 THERAPEUTICSMD INC 1,575,000 13,388,000 0.99%
36 WALGREENS BOOTS ALLIANCE INC 160,400 13,357,000 0.99%
37 INCYTE 155,000 12,397,000 0.92%
38 GALAPAGOS NV 210,000 11,649,000 0.86%
39 ARDELYX INC COM 1,275,000 11,131,000 0.82%
40 PROTHENA CORP PLC 308,000 10,768,000 0.80%
41 PRA HEALTH SCIENCES INC 253,000 10,565,000 0.78%
42 DERMIRA INC 354,900 10,381,000 0.77%
43 HealthSouth Corp 265,000 10,287,000 0.76%
44 ACHILLION PHARMACEUTICALS INC COM 1,312,500 10,238,000 0.76%
45 Wright Medical Group NV 547,900 9,517,000 0.70%
46 Clearside Biomedical Inc 1,353,326 9,487,000 0.70%
47 RETROPHIN INC COM 521,400 9,286,000 0.69%
48 BIOMARIN 113,000 8,791,000 0.65%
49 XENOPORT INC 1,195,000 8,413,000 0.62%
50 ALKERMES PLC SHS 194,500 8,406,000 0.62%
Page 1 of 3

Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0001172661-16-003863, filed 2016.08.15).

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.