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 (2015Q3)
Original 13F HR (0001172661-15-002063) filed in 2015.11.16
#
Name
Shares
Value ($)
%
Options
Notes
1 ACADIA COMPANY COM 812,000 53,811 4.37%
2 AETNA INC NEW 386,000 42,232 3.43%
3 ABBVIE INC 746,423 40,613 3.30%
4 RADIUS HEALTH INCORPORATED COM NEW 560,000 38,814 3.15%
5 HCA HOLDINGS INC 490,500 37,945 3.08%
6 ALLERGAN PLC 126,000 34,248 2.78%
7 ST JUDE MED INC 530,000 33,438 2.71%
8 ALEXION PHARMACEUTIC 172,000 26,899 2.18%
9 GILEAD SCIENCES INC 257,500 25,284 2.05%
10 PFIZER INC 760,000 23,872 1.94%
11 MEDICINES CO 595,000 22,586 1.83%
12 COLLEGIUM PHARMACEUTICAL INC COM 994,400 21,986 1.78%
13 CELGENE CORP 198,000 21,418 1.74%
14 ENVISION HEALTHCARE HLDGS INC 570,000 20,970 1.70%
15 SPARK THERAPEUTICS INCORPORATED 500,000 20,865 1.69%
16 VALEANT PHARMACEUTICALS INTL 112,500 20,068 1.63%
17 LILLY ELI & CO 232,500 19,458 1.58%
18 TEVA PHARMACEUTICAL INDS LTD 325,000 18,350 1.49%
19 TEAM HEALTH HOLDINGS INC 315,000 17,019 1.38%
20 INTUITIVE SURGICAL INC 36,000 16,545 1.34%
21 CIGNA CORPORATION 122,000 16,472 1.34%
22 NEUROCRINE BIOSCIE COM USD0.001 374,000 14,881 1.21%
23 ADEPTUS HEALTH INC 178,000 14,375 1.17%
24 Heartware International, Inc. 273,000 14,281 1.16%
25 INOVALON HLDGS INC COM CL A 685,000 14,269 1.16%
26 RETROPHIN INC 683,900 13,856 1.12%
27 WRIGHT MEDICAL GROUP N.V. 660,000 13,457 1.09%
28 MCKESSON CORP 70,000 12,952 1.05%
29 HEALTHSOUTH CORP 337,500 12,950 1.05%
30 INCYTE CORP 113,000 12,467 1.01%
31 ANTHEM INC 87,500 12,250 0.99%
32 THERMO FISHER SCIENTIFIC INC 100,000 12,228 0.99%
33 ARDELYX INC COM 681,500 11,776 0.96%
34 CVS HEALTH CORP 120,000 11,578 0.94%
35 AMGEN INC 83,250 11,515 0.93%
36 BIOGEN INC 38,650 11,278 0.92%
37 PROTHENA CORP PLC 248,000 11,244 0.91%
38 RTI SURGICAL HOLDINGS INC COM 1,860,000 10,565 0.86%
39 CHIASMA INC 522,500 10,387 0.84%
40 ULTRAGENYX PHARMACEUTICAL INC COM 107,000 10,305 0.84%
41 ZS PHARMA INC 155,000 10,177 0.83%
42 Anacor Pharmaceuticals Inc 86,000 10,123 0.82%
43 CARDIOME PHARMA CORP 1,190,000 10,044 0.82%
44 PRA HEALTH SCIENCES INC 253,000 9,824 0.80%
45 MEDNAX INC 125,000 9,599 0.78%
46 COOPER COS INC 61,900 9,214 0.75%
47 TESARO INCORPORATED 226,000 9,063 0.74%
48 ADAPTIMMUNE THERAPEUTICS PLC 756,100 9,051 0.73%
49 DAVITA INC 122,050 8,828 0.72%
50 INSYS THERAPEUTICS INC NEW COM NEW 308,000 8,766 0.71%
Page 1 of 3