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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 ARATANA THERAPEUTICS INC COM 43,445 242,000 0.02%
2 PARATEK PHARMACEUTICALS INC 30,827 585,000 0.04%
3 PUMA BIOTECHNOLOGY 11,000 862,000 0.07%
4 DBV TECHNOLOGIES 25,000 908,000 0.07%
5 MIRNA THERAPEUTICS INC 150,000 938,000 0.07%
6 SOPHIRIS BIO INC 628,563 1,138,000 0.09%
7 BLUEBIRD BIO INCORPORATED 20,000 1,284,000 0.10%
8 INFINITY PHARMACEUTICALS INC COM 215,000 1,688,000 0.13%
9 CERULEAN PHARMA INC 625,000 1,750,000 0.13%
10 ANTHERA PHARMACEUTICALS I 380,000 1,763,000 0.13%
11 TETRAPHASE PHARMACEUTICALS I COM 200,000 2,006,000 0.15%
12 SAREPTA THERAPEUTICS INC 53,300 2,056,000 0.16% Call
13 Nabriva Therapeutics AG 235,000 2,244,000 0.17%
14 GLOBAL BLOOD THERAPEUTICS IN COM 70,500 2,279,000 0.17%
15 INTERCEPT PHARMACEUTICAL 15,500 2,315,000 0.18%
16 GENOCEA BIOSCIENCES INC 480,000 2,530,000 0.19%
17 ASSEMBLY BIOSCIENCES INC 371,000 2,786,000 0.21%
18 Orexigen Therapeutics, Inc. 1,650,000 2,838,000 0.22%
19 DIMENSION THERAPEUTICS INC COM 271,370 3,061,000 0.23%
20 Egalet Corp 300,000 3,306,000 0.25%
21 RIGEL PHARMACEUTICAL INC 1,100,000 3,333,000 0.25%
22 DYNAVAX TECHNOLOGIES CORP 150,000 3,624,000 0.27%
23 Nivalis Therapeutics Inc 489,000 3,785,000 0.29%
24 SCYNEXIS INC 635,000 3,943,000 0.30%
25 Life Technologies Corp 415,196 4,081,000 0.31%
26 SAREPTA THERAPEUTICS INC 107,500 4,147,000 0.31%
27 CIDARA THERAPEUTICS INC 250,000 4,290,000 0.33%
28 PERRIGO CO PLC 30,000 4,341,000 0.33%
29 CLOVIS ONCOLOGY INC 125,000 4,375,000 0.33%
30 DYAX CORP COM CVR 124,000 4,665,000 0.35%
31 AIMMUNE THERAPEUTICS INC COM 259,646 4,790,000 0.36%
32 NOVOCURE LTD 214,316 4,792,000 0.36%
33 ENDOCHOICE HLDGS INC 590,000 4,927,000 0.37%
34 KITE PHARMA INCORPORATED 80,000 4,930,000 0.37%
35 Ascendis Pharma 270,000 4,946,000 0.37%
36 INVITAE CORP 622,900 5,114,000 0.39%
37 ALLERGAN PLC 5,000 5,136,000 0.39%
38 Compugen Ltd 805,000 5,144,000 0.39%
39 ABBVIE INC 87,500 5,184,000 0.39%
40 Otonomy Inc 197,500 5,481,000 0.42%
41 AMICUS THERAPEUTICS INC 566,500 5,495,000 0.42%
42 FIVE PRIME THERAPEUTICS INC 135,000 5,603,000 0.42%
43 CHINA CORD BLOOD CORP SHS 880,000 5,606,000 0.42%
44 FIBROGEN INC COM 190,000 5,789,000 0.44%
45 COOPER COS INC 44,000 5,905,000 0.45%
46 EPIZYME INC COM 370,000 5,927,000 0.45%
47 REGENERON PHARMACEUTICALS 11,000 5,972,000 0.45%
48 XENOPORT INC 1,100,000 6,039,000 0.46%
49 ATHENA HEALTH INC. 39,500 6,358,000 0.48%
50 ENVISION HEALTHCARE HLDGS INC 245,000 6,363,000 0.48%
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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.