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 (2014Q1)
Original 13F HR (0001172661-14-001101) filed in 2014.05.15
#
Name
Shares
Value ($)
%
Options
Notes
1 ABBVIE INC 360,000 18,504 4.27%
2 ADVISORY BRD CO COM 31,075 1,997 0.46%
3 AGILENT TECHNOLOGIES INC 155,000 8,668 2.00%
4 ALEXION PHARMACEUTIC 48,500 7,378 1.70%
5 ALKERMES PLC 35,500 1,565 0.36%
6 ALLERGAN PLC 56,250 11,579 2.67%
7 AMGEN INC 115,000 14,184 3.27%
8 ATHENA HEALTH INC. 19,500 3,125 0.72%
9 AVANIR PHARMACEUTICALS INC CL 300,000 1,101 0.25%
10 Arrowhead Pharma Inc 75,000 1,232 0.28%
11 BIOGEN INC 55,250 16,899 3.90%
12 BRISTOL MYERS SQUIBB CO 185,500 9,637 2.22%
13 CARDINAL HEALTH INC 76,000 5,318 1.23%
14 CASTLIGHT HEALTH INC COM CL B 100,000 2,122 0.49%
15 CELGENE CORP 77,000 10,749 2.48%
16 CERNER CORP 42,000 2,363 0.55%
17 CHARLES RIV LABS INTL INC 49,500 2,987 0.69%
18 CHINA CORD BLOOD CORP 717,500 2,870 0.66%
19 CONCERT PHARMACEUTICALS INCORPORATED 59,553 801 0.18%
20 COOPER COS INC 60,500 8,310 1.92%
21 COVANCE INC 32,500 3,377 0.78%
22 CUBIST PHARMACEUTI 30,000 2,195 0.51%
23 CVS HEALTH CORP 113,000 8,459 1.95%
24 DICERNA PHARMACEUTICALS INC 105,000 2,966 0.68%
25 ENTEROMEDICS INC 650,000 1,183 0.27%
26 ENVISION HEALTHCARE HLDGS INC 137,500 4,652 1.07%
27 EXELIXIS INC 249,000 881 0.20%
28 FEI COMPANY 27,500 2,833 0.65%
29 FIVE PRIME THERAPEUTICS INC 175,000 3,441 0.79%
30 FLAMEL TECHNOLOGIES SA SPONSORED ADR 750,000 10,050 2.32%
31 FOREST LABS INC COM 54,000 4,983 1.15%
32 GILEAD SCIENCES INC 331,000 23,455 5.41%
33 GW PHARMACEUTICALS PLC 17,750 1,054 0.24%
34 HCA HOLDINGS INC 67,000 3,518 0.81%
35 HUMANA INC 65,500 7,383 1.70%
36 Heartware International, Inc. 50,000 4,689 1.08%
37 ILLUMINA INC 42,500 6,318 1.46%
38 INCYTE CORP 63,500 3,399 0.78%
39 INFINITY PHARMACEUTICALS INC 97,500 1,159 0.27%
40 INNOVIVA INC COM 83,250 2,576 0.59%
41 INTERCEPT PHARMACEUTICALS INCORPORATED 13,000 4,287 0.99%
42 INTERMUNE INC 410,000 13,723 3.17%
43 INTUITIVE SURGICAL INC 18,500 8,103 1.87%
44 JAZZ PHARMACEUTICALS PLC 19,750 2,739 0.63%
45 JOHNSON & JOHNSON 250,000 24,558 5.66%
46 KINDRED BIOSCIENCES INC 92,500 1,714 0.40%
47 MCKESSON CORP 91,500 16,156 3.73%
48 MEDICINES CO 120,000 3,410 0.79%
49 MEDNAX INC 32,500 2,014 0.46%
50 NEUROCRINE BIOSCIE COM USD0.001 300,000 4,830 1.11%
Page 1 of 2