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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 ZOGENIX INC 6,174,809 17,567 0.72%
2 ZOETIS INC 500,000 14,470 0.59% Call
3 ZELTIQ AESTHETICS INC 483,520 9,482 0.39%
4 XOMA CORP DEL 1,000,000 5,210 0.21% Call
5 XENOPORT INC 4,384,797 22,669 0.93%
6 WRIGHT MEDICAL GROUP N.V. 1,554,075 32,977 1.35%
7 VOLCANO CORPORATION 60,500,000 59,767 2.44% PRN
8 VERTEX PHARMACEUTICALS INC 78,500 5,552 0.23%
9 VANDA PHARMACEUTICALS INC COM 501,709 8,153 0.33%
10 UNIVERSAL AMERN CORP NEW 4,600,993 32,529 1.33%
11 UNIQURE NV 350,000 5,453 0.22%
12 TONIX PHARMACEUTICALS HOLDING 244,524 2,545 0.10%
13 THERAPEUTICSMD INC 376,049 2,373 0.10%
14 TARGACEPT INC 617,000 2,931 0.12%
15 Sunesis Pharmaceuticals I 455,741 3,012 0.12%
16 SYNERON MEDICAL LTD 34,518 430 0.02%
17 SYNAGEVA BIOPHARMA CORP 317,678 26,358 1.08%
18 STREAMLINE HEALTH SOLUTIONS COM 1,140,100 5,735 0.23%
19 SPECTRUM PHARMACEUTICALS INC COM 1,265,375 9,921 0.41%
20 SEQUENOM INC 8,377,000 7,466 0.30% PRN
21 RIGEL PHARMACEUTICAL INC 1,027,443 3,986 0.16%
22 REVANCE THERAPEUTICS INC COM 116,689 3,676 0.15%
23 REGENERON PHARMACEUTICALS 4,799 1,441 0.06%
24 Questcor 750,000 48,698 1.99% Call
25 Questcor 1,039,865 67,518 2.76%
26 QUEST DIAGNOSTICS INC 440,303 25,502 1.04%
27 PTC THERAPEUTICS INC 317,530 8,300 0.34%
28 PROSENSA HLDG N V SHS USD 3,211,372 18,080 0.74%
29 PORTOLA PHARMACEUTICALS INC 769,848 19,939 0.81%
30 PALATIN TECHNOLOGIES INC COM 2,000,000 2,460 0.10%
31 PACIFIC BIOSCIENCES CALIF IN 5,406,110 28,923 1.18%
32 OXYGEN BIOTHERAPEUTICS INC 550,000 3,053 0.12%
33 OVASCIENCE INC COM 1,672,549 14,953 0.61%
34 ORTHOFIX INTL N V 591,431 17,832 0.73%
35 OCERA THERAPEUTICS INC 261,119 2,755 0.11%
36 National Australia Bank ADR 17,500 855 0.03%
37 NXSTAGE MED INC COM 3,801,175 48,427 1.98%
38 NOVADAQ TECHNOLOGIES INC 10,000 223 0.01%
39 NEUROCRINE BIOSCIE COM USD0.001 77,994 1,256 0.05%
40 NANOSTRING TECHNOLOGIES INC 391,105 8,076 0.33%
41 NANOSPHERE INC 2,000,000 4,300 0.18%
42 Medtronic Inc 464,000 28,555 1.17%
43 MOLINA HEALTHCARE INC 451,391 16,954 0.69%
44 MERGE HEALTHCARE INC 959,580 2,341 0.10%
45 MERCK & CO INC 477,200 27,091 1.11%
46 MEI PHARMA INC 1,164,575 12,962 0.53%
47 MEDIVATION INC 12,500 805 0.03%
48 MCKESSON CORP 163,000 28,781 1.18%
49 MANNKIND CORP. 1,000,000 4,020 0.16% Put
50 LIPOSCIENCE INC 1,382,350 4,410 0.18%
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