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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 (2015Q2)
Original 13F HR (0001140361-15-032279) filed in 2015.08.14
#
Name
Shares
Value ($)
%
Options
Notes
1 EXELIXIS INC 4,000,000 15,040 0.50% Put
2 HORIZON PHARMA PLC 12,259,875 425,908 14.19%
3 ALLSCRIPTS HEALTHCARE SOLUTN 100,750,000 103,524 3.45% PRN
4 FLAMEL TECHNOLOGIES SA SPONSORED ADR 4,072,809 86,303 2.88%
5 NXSTAGE MED INC COM 5,773,050 82,468 2.75%
6 ARRAY BIOPHARMA INC 9,529,361 68,707 2.29%
7 DYAX CORP COM CVR 2,483,507 65,813 2.19%
8 VANDA PHARMACEUTICALS INC COM 4,784,157 60,711 2.02%
9 MYLAN N V 871,000 59,106 1.97%
10 GLAXOSMITHKLINE PLC 1,376,722 57,340 1.91%
11 ARRAY BIOPHARMA INC 3 06/01/2020 45,000,000 56,942 1.90% PRN
12 Nivalis Therapeutics Inc 3,732,412 56,546 1.88%
13 BLUEBIRD BIO INC COM 326,783 55,020 1.83%
14 WALGREENS BOOTS ALLIANCE INC 648,501 54,759 1.82%
15 DAVITA INC 636,000 50,543 1.68%
16 AETNA INC NEW 369,739 47,127 1.57%
17 UNIVERSAL AMERN CORP NEW 4,409,703 44,626 1.49%
18 GW PHARMACEUTICALS PLC 361,953 44,462 1.48%
19 CHARLES RIV LABS INTL INC 611,436 43,008 1.43%
20 EHEALTH INC COM 3,264,588 41,428 1.38%
21 ENDOLOGIX INC 40,941,000 39,784 1.33% PRN
22 AERIE PHARMACEUTICALS INC COM 2,211,644 39,036 1.30%
23 ANTARES PHARMA INC 18,389,789 38,251 1.27%
24 TEVA PHARMACEUTICAL INDS LTD 646,000 38,179 1.27%
25 SPARK THERAPEUTICS INCORPORATED 631,192 38,042 1.27%
26 SPECTRANETICS CORP 36,901,000 37,991 1.27% PRN
27 ENDOLOGIX INC 2,449,897 37,581 1.25%
28 ZAFGEN INC COM 1,007,614 34,894 1.16%
29 ADEPTUS HEALTH INC 364,000 34,576 1.15%
30 HEARTWARE INTL INC 31,264,000 33,215 1.11% PRN
31 GALAPAGOS NV 642,608 33,094 1.10%
32 GENOMIC HEALTH INC COM 1,183,000 32,876 1.10%
33 Arena Pharmaceuticals, Inc 6,983,710 32,404 1.08%
34 XENCOR INC COM 1,411,000 31,000 1.03%
35 FLUIDIGM CORP DEL 35,000,000 30,952 1.03% PRN
36 MCKESSON CORP 136,000 30,574 1.02%
37 EDWARDS LIFESCIENCES CORP 211,850 30,174 1.01%
38 ZELTIQ AESTHETICS INC 1,016,453 29,955 1.00%
39 Hercules Offshore Inc 2,465,042 29,531 0.98%
40 ENDOCHOICE HLDGS INC 1,797,709 29,393 0.98%
41 INFINITY PHARMACEUTICALS INC 2,465,129 26,993 0.90%
42 INOGEN INC COM 601,772 26,839 0.89%
43 LOXO ONCOLOGY INC COM 1,450,151 26,146 0.87%
44 HEALTHWAYS INC 27,915,000 25,929 0.86% PRN
45 BOSTON SCIENTIFIC CORP 1,405,348 24,875 0.83%
46 WEBMD HEALTH CORP NOTE 1.50012/0 23,000,000 24,636 0.82% PRN
47 ACCURAY INC 24,100,000 24,565 0.82% PRN
48 ANTHEM INC 140,806 23,112 0.77%
49 Proteon Therapeutics Inc 1,265,343 22,599 0.75%
50 SAGE THERAPEUTICS INC 305,000 22,265 0.74%
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