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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 (2016Q1)
Original 13F HR (0001140361-16-065661) filed in 2016.05.16
#
Name
Shares
Value ($)
%
Options
Notes
1 HORIZON PHARMA PLC 13,740,261 227,676 9.69%
2 MYLAN N V 1,832,535 84,938 3.62%
3 NXSTAGE MED INC COM 5,506,028 82,535 3.51%
4 HEALTHWAYS INC 76,925,000 70,595 3.01% PRN
5 HORIZON PHARMA INVT LTD 82,600,000 70,475 3.00% PRN
6 GLAXOSMITHKLINE PLC 1,675,385 67,937 2.89%
7 AETNA INC NEW 591,465 66,451 2.83%
8 PORTOLA PHARMACEUTICALS INC 3,089,785 63,032 2.68%
9 AVEXIS INC COM 2,236,701 60,928 2.59%
10 DAVITA INC 822,000 60,318 2.57%
11 EDITAS MEDICINE INCORPORATED 1,709,400 59,043 2.51%
12 Adeptus Health Inc 956,533 53,126 2.26%
13 XENOPORT INC 11,572,125 52,190 2.22%
14 VANDA PHARMACEUTICALS INC COM 5,996,691 50,132 2.13%
15 GW PHARMACEUTICALS PLC 674,373 48,656 2.07%
16 XENCOR INC COM 3,467,512 46,534 1.98%
17 AAC HLDGS INC COM 2,294,936 45,417 1.93%
18 FLAMEL TECHNOLOGIES SA SPONSORED ADR 4,072,809 44,964 1.91%
19 WALGREENS BOOTS ALLIANCE INC 511,457 43,085 1.83%
20 ENDOLOGIX INC 40,000,000 38,632 1.64% PRN
21 UNIVERSAL AMERN CORP NEW 5,285,500 37,738 1.61%
22 HEARTWARE INTL INC 39,226,000 36,498 1.55% PRN
23 WRIGHT MED GROUP INC 40,050,000 35,961 1.53% PRN
24 ARRAY BIOPHARMA INC 3 06/01/2020 45,000,000 35,876 1.53% PRN
25 SAGE THERAPEUTICS 1,113,654 35,704 1.52%
26 AERIE PHARMACEUTICALS INC 2,632,482 32,011 1.36%
27 EHEALTH INC COM 3,264,588 30,654 1.31%
28 ZELTIQ AESTHETICS INCORPORATED 1,104,417 29,996 1.28%
29 ENDOLOGIX INC 40,941,000 29,871 1.27% PRN
30 ARRAY BIOPHARMA INC COM 9,529,361 28,112 1.20%
31 FIVE PRIME THERAPEUTICS INC 680,000 27,628 1.18%
32 MCKESSON CORP 175,000 27,519 1.17%
33 Heartware International, Inc. 870,634 27,355 1.16%
34 ACORDA THERAPEUTICS 1,029,410 27,228 1.16%
35 DBV TECHNOLOGIES 817,806 26,620 1.13%
36 RELYPSA INC 1,873,471 25,386 1.08%
37 HEALTHWAYS INC 2,475,387 24,977 1.06%
38 SPECTRANETICS CORP 29,831,000 23,643 1.01% PRN
39 INFINITY PHARMACEUTICALS INC COM 4,398,862 23,182 0.99%
40 KEMPHARM INC 1,420,497 20,597 0.88%
41 ZAFGEN INC COM 3,055,603 20,411 0.87%
42 ProNAi Therapeutics, Inc. 3,001,302 20,229 0.86%
43 RITE AID CORP 2,393,072 19,504 0.83%
44 GLOBAL BLOOD THERAPEUTICS IN COM 1,193,811 18,934 0.81%
45 AXOGEN INC 3,381,439 18,125 0.77%
46 AKARI THERAPEUTICS PLC 1,150,700 16,110 0.69%
47 Nivalis Therapeutics Inc 3,732,412 15,564 0.66%
48 FLUIDIGM CORP DEL 27,715,000 15,353 0.65% PRN
49 ANTHEM INC 102,000 14,177 0.60%
50 GALAPAGOS NV 327,626 13,701 0.58%
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