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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 DYAX CORP COM CVR 3,786,478 34,003 1.39%
2 HORIZON PHARMA PLC 1,310,930 19,821 0.81%
3 ABBVIE INC 1,025,000 52,685 2.15%
4 ACCURAY INC 25,700,000 30,767 1.26% PRN
5 ACCURAY INC 5,000,000 9,546 0.39% PRN
6 ACHILLION PHARMACEUTICALS IN 92,804 305 0.01%
7 AERIE PHARMACEUTICALS INC COM 565,180 11,976 0.49%
8 AGILENT TECHNOLOGIES INC 25,000 1,398 0.06%
9 AIR METHODS CORP 552,544 29,522 1.21%
10 ALERE INC 5,750,000 6,278 0.26% PRN
11 ALIMERA SCIENCES INC 1,311,290 10,346 0.42%
12 ALNYLAM PHARMACEUTICALS INC 302,000 20,276 0.83%
13 ALPHATEC HOLDINGS INC 3,982,738 5,974 0.24%
14 AMAG PHARMACEUTICALS INC 34,520,000 34,986 1.43% PRN
15 AMAG PHARMACEUTICALS INC 534,930 10,351 0.42%
16 AMEDISYS INC COM 439,000 6,537 0.27%
17 ANI PHARMACEUTICALS INC 371,572 11,649 0.48%
18 ANTARES PHARMA INC 9,488,461 33,210 1.36%
19 ANTHERA PHARMACEUTICALS I 1,691,857 5,668 0.23%
20 AQUINOX PHARMACEUTICALS INC 62,387 794 0.03%
21 ARATANA THERAPEUTICS INC 788,904 14,642 0.60%
22 ARRAY BIOPHARMA INC 12,205,673 57,367 2.34%
23 ARRAY BIOPHARMA INC 3 06/01/2020 26,000,000 26,665 1.09% PRN
24 AUSPEX PHARMACEUTICALS INC 1,988,990 61,181 2.50%
25 AUXILIUM PHARMACEUTICALS INC 2,566,705 69,763 2.85%
26 AUXILIUM PHARMACEUTICALS INC 250,000 6,795 0.28% Put
27 Allergan plc 100,000 12,410 0.51% Call
28 Allergan plc 215,636 26,760 1.09%
29 Arena Pharmaceuticals, Inc 1,216,579 7,664 0.31%
30 Auxilium Pharmaceuticals Inc 2,500,000 3,278 0.13% PRN
31 BAXTER INTL INC 85,000 6,254 0.26%
32 BIOCRYST PHARMACEUTICALS 907,920 9,606 0.39%
33 BIODELIVERY SCIENCES INTL IN 3,986,760 33,648 1.37%
34 BIOGEN INC 11,750 3,594 0.15%
35 BLUEBIRD BIO INC COM 414,474 9,425 0.38%
36 CANCER GENETICS 318,012 4,799 0.20%
37 CAPITAL SR LIVING CORP COM 308,088 8,007 0.33%
38 CAS MED SYS INC 3,200,000 6,944 0.28%
39 CENTENE CORP DEL 124,795 7,768 0.32%
40 CONCERT PHARMACEUTICALS INCORPORATED 617,649 8,307 0.34%
41 DAVITA INC 348,011 23,961 0.98%
42 DENDREON CORP 183,660,000 133,789 5.46% PRN
43 DENDREON CORP 14,740,000 14,308 0.58% PRN
44 DERMA SCIENCES ORD 300,000 3,804 0.16%
45 DICERNA PHARMACEUTICALS INC 2,428,569 68,607 2.80%
46 DISCOVERY LABORATORIES INC N 3,659,700 7,868 0.32%
47 EAGLE PHARMACEUTICALS INC COM 284,653 3,629 0.15%
48 EHEALTH INC COM 271,000 13,767 0.56%
49 ENDOLOGIX INC 12,450,000 11,930 0.49% PRN
50 ENDOLOGIX INC 683,458 8,796 0.36%
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