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Institutional Investment Manager
DEERFIELD MANAGEMENT COMPANY, L.P.
DEERFIELD MANAGEMENT COMPANY, L.P. (CIK: 0001009258) incorporated in Delaware, located at 345 Park Avenue South, 12th Floor, New York, NY. Institutional holdings reported to the SEC.

Institutional Holdings (2014Q1)
Original 13F HR (0001140361-14-021676) filed in 2014.05.15
#
Name
Shares
Value ($)
%
Options
Notes
1 DENDREON CORP 183,660,000 133,789 5.46% PRN
2 VOLCANO CORPORATION 60,500,000 59,767 2.44% PRN
3 INTEGRA LIFESCIENCES HLDGS C 41,523,000 43,698 1.78% PRN
4 INTERMUNE INC 40,295,000 51,373 2.10% PRN
5 HOLOGIC INC SR STEP CV NT 42 37,516,000 38,347 1.57% PRN
6 AMAG PHARMACEUTICALS INC 34,520,000 34,986 1.43% PRN
7 ARRAY BIOPHARMA INC 3 06/01/2020 26,000,000 26,665 1.09% PRN
8 ACCURAY INC 25,700,000 30,767 1.26% PRN
9 DENDREON CORP 14,740,000 14,308 0.58% PRN
10 ENDOLOGIX INC 12,450,000 11,930 0.49% PRN
11 ARRAY BIOPHARMA INC 12,205,673 57,367 2.34%
12 ANTARES PHARMA INC 9,488,461 33,210 1.36%
13 SEQUENOM INC 8,377,000 7,466 0.30% PRN
14 Intermune 7,500,000 19,618 0.80% PRN
15 ZOGENIX INC 6,174,809 17,567 0.72%
16 ALERE INC 5,750,000 6,278 0.26% PRN
17 PACIFIC BIOSCIENCES CALIF IN 5,406,110 28,923 1.18%
18 FLAMEL TECHNOLOGIES SA SPONSORED ADR 5,258,475 70,464 2.88%
19 ACCURAY INC 5,000,000 9,546 0.39% PRN
20 UNIVERSAL AMERN CORP NEW 4,600,993 32,529 1.33%
21 INFINITY PHARMACEUTICALS INC 4,444,027 52,839 2.16%
22 XENOPORT INC 4,384,797 22,669 0.93%
23 BIODELIVERY SCIENCES INTL IN 3,986,760 33,648 1.37%
24 ALPHATEC HOLDINGS INC 3,982,738 5,974 0.24%
25 NXSTAGE MED INC COM 3,801,175 48,427 1.98%
26 DYAX CORP COM CVR 3,786,478 34,003 1.39%
27 DISCOVERY LABORATORIES INC N 3,659,700 7,868 0.32%
28 PROSENSA HLDG N V SHS USD 3,211,372 18,080 0.74%
29 CAS MED SYS INC 3,200,000 6,944 0.28%
30 KALOBIOS PHARMACEUTICALS INC 2,786,783 7,552 0.31%
31 IMMUNOMEDICS INCORPORATED 2,628,972 11,068 0.45%
32 AUXILIUM PHARMACEUTICALS INC 2,566,705 69,763 2.85%
33 Auxilium Pharmaceuticals Inc 2,500,000 3,278 0.13% PRN
34 DICERNA PHARMACEUTICALS INC 2,428,569 68,607 2.80%
35 INSMED INC 2,016,147 38,387 1.57%
36 NANOSPHERE INC 2,000,000 4,300 0.18%
37 PALATIN TECHNOLOGIES INC COM 2,000,000 2,460 0.10%
38 AUSPEX PHARMACEUTICALS INC 1,988,990 61,181 2.50%
39 ANTHERA PHARMACEUTICALS I 1,691,857 5,668 0.23%
40 OVASCIENCE INC COM 1,672,549 14,953 0.61%
41 INTERMUNE INC 1,583,942 53,015 2.16%
42 WRIGHT MEDICAL GROUP N.V. 1,554,075 32,977 1.35%
43 KERYX BIOPHARMACEUTICALS INCORPORATED 1,403,105 23,909 0.98%
44 LIPOSCIENCE INC 1,382,350 4,410 0.18%
45 ALIMERA SCIENCES INC 1,311,290 10,346 0.42%
46 HORIZON PHARMA PLC 1,310,930 19,821 0.81%
47 HUMANA INC 1,280,000 144,282 5.89% Call
48 SPECTRUM PHARMACEUTICALS INC COM 1,265,375 9,921 0.41%
49 Arena Pharmaceuticals, Inc 1,216,579 7,664 0.31%
50 MEI PHARMA INC 1,164,575 12,962 0.53%
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