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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 (2015Q2)
Portfolio Summary: 117 holdings with a total value of $1,369,933,000.
#
Name
Shares
Value ($)
%
Options
Notes
1 ROKA BIOSCIENCE INC 250,000 650,000 0.05%
2 IMMUNE DESIGN CORP 55,000 1,136,000 0.08%
3 Vical Inc 1,829,088 1,280,000 0.09%
4 PUMA BIOTECHNOLOGY 11,000 1,284,000 0.09%
5 SCYNEXIS INC 176,000 1,547,000 0.11%
6 FLAMEL TECHNOLOGIES SA SPONSORED ADR 75,000 1,589,000 0.12%
7 KINDRED BIOSCIENCES INC 275,000 1,876,000 0.14%
8 XENOPORT INC 325,000 1,992,000 0.15%
9 TETRAPHASE PHARMACEUTICALS INC COM 43,000 2,040,000 0.15%
10 PTC THERAPEUTICS INC 43,000 2,070,000 0.15%
11 INFINITY PHARMACEUTICALS INC 215,000 2,354,000 0.17%
12 DYAX CORP COM CVR 102,500 2,716,000 0.20%
13 CERULEAN PHARMA INC 625,000 2,875,000 0.21%
14 FIVE PRIME THERAPEUTICS INC 120,000 2,981,000 0.22%
15 CIDARA THERAPEUTICS INC 250,000 3,505,000 0.26%
16 ILLUMINA INC 17,750 3,876,000 0.28%
17 ANTHERA PHARMACEUTICALS I 470,000 4,051,000 0.30%
18 BIODEL INC 4,000,000 4,120,000 0.30%
19 Ascendis Pharma 240,000 4,243,000 0.31%
20 ATHENA HEALTH INC. 38,000 4,354,000 0.32%
21 DERMIRA INC COM 250,001 4,388,000 0.32%
22 BIOMARIN PHARMACEUTICAL INC 32,500 4,445,000 0.32%
23 FIBROGEN INC 190,000 4,465,000 0.33%
24 ARATANA THERAPEUTICS INC 300,000 4,536,000 0.33%
25 JAZZ PHARMACEUTICALS PLC 26,000 4,578,000 0.33%
26 PACIRA PHARMACEUTICALS INC 68,000 4,809,000 0.35%
27 RAPTOR PHARMACEUTICAL CORP 305,000 4,816,000 0.35%
28 CERNER CORP 70,000 4,834,000 0.35%
29 Intersect ENT Inc 175,000 5,010,000 0.37%
30 WELLCARE HEALTH PLANS INC 60,000 5,090,000 0.37%
31 CHINA CORD BLOOD CORP 830,000 5,113,000 0.37%
32 MACROGENICS INC 137,500 5,221,000 0.38%
33 ALLERGAN PLC 5,000 5,228,000 0.38%
34 INSYS THERAPEUTICS INC NEW COM NEW 147,000 5,280,000 0.39%
35 AMICUS THERAPEUTICS INC COM 377,500 5,342,000 0.39%
36 REGENERON PHARMACEUTICALS 11,000 5,611,000 0.41%
37 TANDEM DIABETES CARE INC COM 535,000 5,799,000 0.42%
38 CARDIOME PHARMA CORP 625,000 5,881,000 0.43%
39 INVITAE CORP 400,000 5,952,000 0.43%
40 ASSEMBLY BIOSCIENCES INC 313,500 6,038,000 0.44%
41 Theravance Biopharma Inc 475,000 6,185,000 0.45%
42 CASTLIGHT HEALTH INC COM CL B 800,000 6,512,000 0.48%
43 NOVADAQ TECHNOLOGIES INC 540,000 6,539,000 0.48%
44 CONNECTURE INC 625,000 6,600,000 0.48%
45 Wuxi Pharmatech Inc ADR 168,000 7,100,000 0.52%
46 IDEXX LAB 111,000 7,120,000 0.52%
47 KITE PHARMA INCORPORATED 118,000 7,194,000 0.53%
48 EPIZYME INC COM 306,500 7,356,000 0.54%
49 Otonomy Inc 320,800 7,375,000 0.54%
50 Life Technologies Corp 408,496 7,565,000 0.55%
Page 1 of 3

Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0001172661-15-001627, filed 2015.08.14).

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.