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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)
Portfolio Summary: 120 holdings with a total value of $3,001,745,000.
#
Name
Shares
Value ($)
%
Options
Notes
1 HORIZON PHARMA PLC 12,259,875 425,908,000 14.19%
2 ALLSCRIPTS HEALTHCARE SOLUTN 100,750,000 103,524,000 3.45% PRN
3 FLAMEL TECHNOLOGIES SA SPONSORED ADR 4,072,809 86,303,000 2.88%
4 NXSTAGE MED INC COM 5,773,050 82,468,000 2.75%
5 ARRAY BIOPHARMA INC COM 9,529,361 68,707,000 2.29%
6 DYAX CORP COM CVR 2,483,507 65,813,000 2.19%
7 VANDA PHARMACEUTICALS INC COM 4,784,157 60,711,000 2.02%
8 MYLAN N V 871,000 59,106,000 1.97%
9 GLAXOSMITHKLINE PLC 1,376,722 57,340,000 1.91%
10 ARRAY BIOPHARMA INC 3 06/01/2020 45,000,000 56,942,000 1.90% PRN
11 Nivalis Therapeutics Inc 3,732,412 56,546,000 1.88%
12 BLUEBIRD BIO INCORPORATED 326,783 55,020,000 1.83%
13 WALGREENS BOOTS ALLIANCE INC 648,501 54,759,000 1.82%
14 DAVITA INC 636,000 50,543,000 1.68%
15 AETNA INC NEW 369,739 47,127,000 1.57%
16 UNIVERSAL AMERN CORP NEW 4,409,703 44,626,000 1.49%
17 GW PHARMACEUTICALS PLC 361,953 44,462,000 1.48%
18 CHARLES RIV LABS INTL INC 611,436 43,008,000 1.43%
19 EHEALTH INC COM 3,264,588 41,428,000 1.38%
20 ENDOLOGIX INC 40,941,000 39,784,000 1.33% PRN
21 AERIE PHARMACEUTICALS INC 2,211,644 39,036,000 1.30%
22 ANTARES PHARMA INC 18,389,789 38,251,000 1.27%
23 TEVA PHARMACEUTICAL INDS LTD 646,000 38,179,000 1.27%
24 SPARK THERAPEUTICS INC 631,192 38,042,000 1.27%
25 SPECTRANETICS CORP 36,901,000 37,991,000 1.27% PRN
26 ENDOLOGIX INC 2,449,897 37,581,000 1.25%
27 ZAFGEN INC COM 1,007,614 34,894,000 1.16%
28 Adeptus Health Inc 364,000 34,576,000 1.15%
29 HEARTWARE INTL INC 31,264,000 33,215,000 1.11% PRN
30 GALAPAGOS NV 642,608 33,094,000 1.10%
31 GENOMIC HEALTH INC COM 1,183,000 32,876,000 1.10%
32 ARENA PHARMACEUTICALS INC 6,983,710 32,404,000 1.08%
33 XENCOR INC COM 1,411,000 31,000,000 1.03%
34 FLUIDIGM CORP DEL 35,000,000 30,952,000 1.03% PRN
35 MCKESSON CORP 136,000 30,574,000 1.02%
36 EDWARDS LIFESCIENCES CORP 211,850 30,174,000 1.01%
37 ZELTIQ AESTHETICS INCORPORATED 1,016,453 29,955,000 1.00%
38 HEALTHWAYS INC 2,465,042 29,531,000 0.98%
39 ENDOCHOICE HLDGS INC 1,797,709 29,393,000 0.98%
40 INFINITY PHARMACEUTICALS INC COM 2,465,129 26,993,000 0.90%
41 INOGEN INC COM 601,772 26,839,000 0.89%
42 LOXO ONCOLOGY INC COM 1,450,151 26,146,000 0.87%
43 HEALTHWAYS INC 27,915,000 25,929,000 0.86% PRN
44 BOSTON SCIENTIFIC CORP 1,405,348 24,875,000 0.83%
45 WEBMD HEALTH CORP NOTE 23,000,000 24,636,000 0.82% PRN
46 ACCURAY INC 24,100,000 24,565,000 0.82% PRN
47 ANTHEM INC 140,806 23,112,000 0.77%
48 Proteon Therapeutics 1,265,343 22,599,000 0.75%
49 SAGE THERAPEUTICS 305,000 22,265,000 0.74%
50 INSMED INC COM PAR .01 891,546 21,772,000 0.73%
Page 1 of 3

Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0001140361-15-032279, filed 2015.08.14).

From 2023-01-03 onward, the SEC requires values to be reported in nearest dollars. Earlier filings reported values in thousands; therefore, positions shown as $0 in older filings may represent actual values between $0–$999.