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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 (2015Q1)
Portfolio Summary: 124 holdings with a total value of $3,087,400,000.
#
Name
Shares
Value ($)
%
Options
Notes
1 AUSPEX PHARMACEUTICALS INC 4,449,103 446,112,000 14.45%
2 HORIZON PHARMA PLC 12,792,689 332,226,000 10.76%
3 ALLSCRIPTS HEALTHCARE SOLUTN 100,750,000 98,882,000 3.20% PRN
4 ABBVIE INC 1,534,000 89,800,000 2.91%
5 NXSTAGE MED INC COM 5,073,050 87,764,000 2.84%
6 ARRAY BIOPHARMA INC COM 11,834,595 87,221,000 2.83%
7 AVALANCHE BIOTECHNOLOGIES IN 2,117,473 85,800,000 2.78%
8 HORIZON PHARMA INC 16,014,461 78,189,000 2.53% PRN
9 BLUEBIRD BIO INCORPORATED 631,309 76,243,000 2.47%
10 FLAMEL TECHNOLOGIES SA SPONSORED ADR 4,072,809 73,229,000 2.37%
11 DAVITA INC 730,000 59,334,000 1.92%
12 ARRAY BIOPHARMA INC 3 06/01/2020 45,000,000 56,037,000 1.82% PRN
13 INFINITY PHARMACEUTICALS INC COM 3,968,155 55,475,000 1.80%
14 UNIVERSAL AMERN CORP NEW 5,186,148 55,388,000 1.79%
15 INTEGRA LIFESCIENCES HLDGS C 47,428,000 54,556,000 1.77% PRN
16 SPARK THERAPEUTICS INC 631,192 48,917,000 1.58%
17 WALGREENS BOOTS ALLIANCE INC 512,800 43,424,000 1.41%
18 ZAFGEN INC COM 1,050,178 41,598,000 1.35%
19 ARENA PHARMACEUTICALS INC 9,229,379 40,332,000 1.31%
20 GLAXOSMITHKLINE PLC 873,185 40,297,000 1.31%
21 ENDOLOGIX INC 2,349,351 40,103,000 1.30%
22 VANDA PHARMACEUTICALS INC COM 4,134,157 38,448,000 1.25%
23 ENDOLOGIX INC 34,925,000 35,203,000 1.14% PRN
24 INSMED INC COM PAR .01 1,628,531 33,873,000 1.10%
25 GW PHARMACEUTICALS PLC 363,700 33,144,000 1.07%
26 ANTARES PHARMA INC 12,078,318 32,732,000 1.06%
27 EHEALTH INC COM 3,264,588 30,622,000 0.99%
28 AETNA INC NEW 284,300 30,286,000 0.98%
29 SAGE THERAPEUTICS 595,443 29,909,000 0.97%
30 XENCOR INC COM 1,895,535 29,040,000 0.94%
31 ACHILLION PHARMACEUTICALS INC COM 2,810,164 27,708,000 0.90%
32 ACCURAY INC 24,100,000 26,694,000 0.86% PRN
33 WEBMD HEALTH CORP NOTE 23,000,000 24,433,000 0.79% PRN
34 HEARTWARE INTL INC 20,464,000 23,227,000 0.75% PRN
35 CHARLES RIV LABS INTL INC 289,450 22,950,000 0.74%
36 ORTHOFIX INTERNATIONAL NV 630,222 22,619,000 0.73%
37 ALIMERA SCIENCES INC 4,420,580 22,147,000 0.72%
38 PORTOLA PHARMACEUTICALS INC 574,546 21,810,000 0.71%
39 MCKESSON CORP 92,000 20,810,000 0.67%
40 LOXO ONCOLOGY INC COM 1,591,546 19,815,000 0.64%
41 GILEAD SCIENCES INC 200,000 19,626,000 0.64% Put
42 INOGEN INC COM 601,772 19,251,000 0.62%
43 AERIE PHARMACEUTICALS INC 606,118 18,996,000 0.62%
44 DYAX CORP COM CVR 1,131,414 18,957,000 0.61%
45 HUMANA 106,300 18,924,000 0.61%
46 PACIFIC BIOSCIENCES CALIF IN 3,048,310 17,802,000 0.58%
47 TRUPANION INC COM 2,101,848 16,815,000 0.54%
48 NUVASIVE INC COM 338,194 15,554,000 0.50%
49 ANTHEM INC 99,742 15,401,000 0.50%
50 NANOSTRING TECHNOLOGIES INC 1,460,652 14,884,000 0.48%
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Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0001140361-15-020245, filed 2015.05.15). and New Holdings filing (0001140361-15-032272, 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.