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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 (2016Q4)
Portfolio Summary: 102 holdings with a total value of $2,430,288,000.
#
Name
Shares
Value ($)
%
Options
Notes
1 HORIZON PHARMA PLC 8,956,988 144,924,000 5.96%
2 NXSTAGE MED INC COM 4,258,196 111,607,000 4.59%
3 AVEXIS INC COM 2,236,701 106,758,000 4.39%
4 PORTOLA PHARMACEUTICALS INC 4,654,447 104,446,000 4.30%
5 GW PHARMACEUTICALS PLC 928,192 103,725,000 4.27%
6 HORIZON PHARMA INVT LTD 82,600,000 78,342,000 3.22% PRN
7 AERIE PHARMACEUTICALS INC 1,838,829 69,600,000 2.86%
8 MYLAN N V 1,766,378 67,387,000 2.77%
9 ARRAY BIOPHARMA INC 3 06/01/2020 45,000,000 62,545,000 2.57% PRN
10 DBV TECHNOLOGIES 1,743,229 61,240,000 2.52%
11 VANDA PHARMACEUTICALS INC COM 3,424,676 54,624,000 2.25%
12 NEVRO CORP 751,298 54,589,000 2.25%
13 XENCOR INC COM 2,020,000 53,166,000 2.19%
14 BLUEPRINT MEDICINES CORP COM 1,842,415 51,680,000 2.13%
15 ENDOLOGIX INC 51,117,000 46,140,000 1.90% PRN
16 ANTHEM INC 318,000 45,719,000 1.88%
17 LANNET INC COM NEW 2,007,551 44,266,000 1.82%
18 FLAMEL TECHNOLOGIES SA SPONSORED ADR 4,072,809 42,316,000 1.74%
19 WRIGHT MED GROUP INC 40,050,000 41,818,000 1.72% PRN
20 TRIB 48,000,000 40,401,000 1.66% PRN
21 HUMANA 198,000 40,398,000 1.66%
22 UNIVERSAL AMERN CORP NEW 3,774,090 37,552,000 1.55%
23 ENDOLOGIX INC 40,500,000 35,425,000 1.46% PRN
24 CENTENE CORP DEL 603,643 34,112,000 1.40%
25 ISIS PHARMACEUTICALS INC DEL 33,186,000 33,802,000 1.39% PRN
26 HEALTHWAYS INC 25,000,000 32,381,000 1.33% PRN
27 AETNA INC NEW 242,000 30,010,000 1.23%
28 NEVRO CORP 27,600,000 29,494,000 1.21% PRN
29 WALGREENS BOOTS ALLIANCE INC 355,957 29,459,000 1.21%
30 MOLINA HEALTHCARE INC 25,000,000 28,480,000 1.17% PRN
31 EHEALTH INC COM 2,640,609 28,122,000 1.16%
32 EDITAS MEDICINE INCORPORATED 1,709,400 27,744,000 1.14%
33 GALAPAGOS NV 423,112 27,160,000 1.12%
34 GLOBUS MED INC 1,036,000 25,703,000 1.06%
35 Audentes Therapeutics, Inc. 1,403,653 25,645,000 1.06%
36 SYROS PHARMACEUTICALS INC 1,812,778 22,043,000 0.91%
37 Ascendis Pharma 1,050,000 21,252,000 0.87%
38 BIOCRYST PHARMACEUTICALS 3,237,734 20,495,000 0.84%
39 MALLINCKRODT PUB LTD CO SHS 407,000 20,277,000 0.83%
40 EPIZYME INC COM 1,601,049 19,373,000 0.80%
41 FLUIDIGM CORP DEL 27,715,000 19,228,000 0.79% PRN
42 BLUEBIRD BIO INCORPORATED 302,027 18,635,000 0.77%
43 MYOVANT SCIENCES LTD 1,496,675 18,619,000 0.77%
44 MYLAN N V 450,000 17,168,000 0.71% Call
45 CLOVIS ONCOLOGY INC NOTE 16,500,000 16,979,000 0.70% PRN
46 SOCIETAL CDMO INC 2,075,000 16,725,000 0.69%
47 AXOGEN INC 1,838,225 16,544,000 0.68%
48 ZIMMER BIOMET HLDGS INC 150,000 15,480,000 0.64%
49 TESARO INC 112,200 15,089,000 0.62%
50 SELECTA BIOSCIENCES INC 853,205 14,632,000 0.60%
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Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0001140361-17-007402, filed 2017.02.14).

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.