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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 INTERMUNE INC 40,295,000 51,373 2.10% PRN
4 INTEGRA LIFESCIENCES HLDGS C 41,523,000 43,698 1.78% 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 ACCURAY INC 25,700,000 30,767 1.26% PRN
8 ARRAY BIOPHARMA INC 3 06/01/2020 26,000,000 26,665 1.09% PRN
9 Intermune 7,500,000 19,618 0.80% PRN
10 DENDREON CORP 14,740,000 14,308 0.58% PRN
11 ENDOLOGIX INC 12,450,000 11,930 0.49% PRN
12 ACCURAY INC 5,000,000 9,546 0.39% PRN
13 SEQUENOM INC 8,377,000 7,466 0.30% PRN
14 ALERE INC 5,750,000 6,278 0.26% PRN
15 Auxilium Pharmaceuticals Inc 2,500,000 3,278 0.13% PRN
16 HUMANA INC 1,280,000 144,282 5.89% Call
17 FLAMEL TECHNOLOGIES SA SPONSORED ADR 5,258,475 70,464 2.88%
18 AUXILIUM PHARMACEUTICALS INC 2,566,705 69,763 2.85%
19 LABORATORY CORP AMER HLDGS 709,689 69,699 2.85%
20 DICERNA PHARMACEUTICALS INC 2,428,569 68,607 2.80%
21 Questcor 1,039,865 67,518 2.76%
22 AUSPEX PHARMACEUTICALS INC 1,988,990 61,181 2.50%
23 ARRAY BIOPHARMA INC 12,205,673 57,367 2.34%
24 INTERMUNE INC 1,583,942 53,015 2.16%
25 INFINITY PHARMACEUTICALS INC 4,444,027 52,839 2.16%
26 ABBVIE INC 1,025,000 52,685 2.15%
27 Questcor 750,000 48,698 1.99% Call
28 NXSTAGE MED INC COM 3,801,175 48,427 1.98%
29 INSMED INC 2,016,147 38,387 1.57%
30 DYAX CORP COM CVR 3,786,478 34,003 1.39%
31 BIODELIVERY SCIENCES INTL IN 3,986,760 33,648 1.37%
32 INTERMUNE INC 1,000,000 33,470 1.37% Call
33 ANTARES PHARMA INC 9,488,461 33,210 1.36%
34 WRIGHT MEDICAL GROUP N.V. 1,554,075 32,977 1.35%
35 UNIVERSAL AMERN CORP NEW 4,600,993 32,529 1.33%
36 AIR METHODS CORP 552,544 29,522 1.21%
37 PACIFIC BIOSCIENCES CALIF IN 5,406,110 28,923 1.18%
38 MCKESSON CORP 163,000 28,781 1.18%
39 Medtronic Inc 464,000 28,555 1.17%
40 MERCK & CO INC 477,200 27,091 1.11%
41 Allergan plc 215,636 26,760 1.09%
42 SYNAGEVA BIOPHARMA CORP 317,678 26,358 1.08%
43 QUEST DIAGNOSTICS INC 440,303 25,502 1.04%
44 DAVITA INC 348,011 23,961 0.98%
45 KERYX BIOPHARMACEUTICALS INCORPORATED 1,403,105 23,909 0.98%
46 XENOPORT INC 4,384,797 22,669 0.93%
47 ALNYLAM PHARMACEUTICALS INC 302,000 20,276 0.83%
48 PORTOLA PHARMACEUTICALS INC 769,848 19,939 0.81%
49 HORIZON PHARMA PLC 1,310,930 19,821 0.81%
50 PROSENSA HLDG N V SHS USD 3,211,372 18,080 0.74%
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