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 (2016Q1)
Portfolio Summary: 128 holdings with a total value of $1,193,502,000.
#
Name
Shares
Value ($)
%
Options
Notes
1 Mirna Therapeutics, Inc. 150,000 656,000 0.05%
2 PORTOLA PHARMACEUTICALS INC 35,000 714,000 0.06% Call
3 BLUEBIRD BIO INC COM 20,000 850,000 0.07%
4 WRIGHT MED GROUP INC SR CONV NT 2 20 1,000,000 898,000 0.08% PRN
5 SOPHIRIS BIO INC 628,563 905,000 0.08%
6 PUMA BIOTECHNOLOGY 31,500 925,000 0.08%
7 OREXIGEN THERAPEUTICS INC COM 1,653,000 930,000 0.08%
8 GLOBAL BLOOD THERAPEUTICS INCORPORATED 78,000 1,237,000 0.10%
9 INTERCEPT PHARMACEUTICALS INCORPORATED 10,000 1,285,000 0.11%
10 INFINITY PHARMACEUTICALS INC 270,000 1,423,000 0.12%
11 ANTHERA PHARMACEUTICALS I 450,000 1,629,000 0.14%
12 CERULEAN PHARMA INC 625,000 1,694,000 0.14%
13 Life Technologies Corp 433,496 1,708,000 0.14%
14 TETRAPHASE PHARMACEUTICALS INC COM 400,000 1,852,000 0.16%
15 ASSEMBLY BIOSCIENCES INC 390,000 1,958,000 0.16%
16 Nivalis Therapeutics Inc 489,000 2,039,000 0.17%
17 Egalet Corp 300,000 2,058,000 0.17%
18 DIMENSION THERAPEUTICS INC 271,370 2,125,000 0.18%
19 OPHTHOTECH CORP 51,500 2,177,000 0.18%
20 VALEANT PHARMACEUTICALS INTL 85,500 2,249,000 0.19%
21 DBV TECHNOLOGIES S A 73,000 2,376,000 0.20%
22 ALDER BIOPHARMACEUTICALS INC 97,500 2,388,000 0.20%
23 CLOVIS ONCOLOGY INC 125,000 2,400,000 0.20%
24 SAREPTA THERAPEUTICS INC 131,000 2,557,000 0.21%
25 SCYNEXIS INC 635,000 2,559,000 0.21%
26 AURIS MED HLDG AG 787,600 2,867,000 0.24%
27 RIGEL PHARMACEUTICAL INC 1,464,050 3,045,000 0.26%
28 ENDOCHOICE HLDGS INC 590,000 3,074,000 0.26%
29 NOVOCURE LTD 214,316 3,103,000 0.26%
30 CIDARA THERAPEUTICS INC 250,000 3,175,000 0.27%
31 DYNAVAX TECHNOLOGIES CORP 165,000 3,175,000 0.27%
32 PARATEK PHARMACEUTICALS INC 223,000 3,383,000 0.28%
33 MEDICINES CO SR GLBL CV NT 22 3,000,000 3,405,000 0.29% PRN
34 ADR - Nabriva Therapeutics AG- Usd 380,000 3,405,000 0.29%
35 PORTOLA PHARMACEUTICALS INC 175,000 3,570,000 0.30%
36 Otonomy Inc 240,000 3,581,000 0.30%
37 KITE PHARMA INCORPORATED 80,000 3,673,000 0.31%
38 GENOCEA BIOSCIENCES INC 480,000 3,715,000 0.31%
39 PERRIGO CO PLC 30,000 3,838,000 0.32%
40 AVEXIS INC COM 142,758 3,889,000 0.33%
41 AIMMUNE THERAPEUTICS INC COM 293,000 3,973,000 0.33%
42 MACROGENICS INC 225,000 4,219,000 0.35%
43 FIBROGEN INC 204,000 4,343,000 0.36%
44 NOVAVAX INC COM 852,500 4,399,000 0.37%
45 CHIASMA INC 492,500 4,511,000 0.38%
46 PROTEOSTASIS THERAPEUTICS IN COM 470,000 4,531,000 0.38%
47 COMPUGEN LTD 820,000 4,576,000 0.38%
48 ALLERGAN PLC 5,000 4,585,000 0.38%
49 CARDIOME PHARMA CORP 1,190,000 4,867,000 0.41%
50 TANDEM DIABETES CARE INC COM 562,500 4,899,000 0.41%
Page 1 of 3

Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0001172661-16-003409, filed 2016.05.16).

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.