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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 (2015Q3)
Portfolio Summary: 134 holdings with a total value of $2,585,133,000.
#
Name
Shares
Value ($)
%
Options
Notes
1 HORIZON PHARMA PLC 8,081,407 160,173,000 6.20%
2 ALLSCRIPTS HEALTHCARE SOLUTN 100,750,000 99,819,000 3.86% PRN
3 NXSTAGE MED INC COM 6,318,050 99,636,000 3.85%
4 GLAXOSMITHKLINE PLC 2,282,722 87,771,000 3.40%
5 AETNA INC NEW 636,039 69,589,000 2.69%
6 FLAMEL TECHNOLOGIES SA SPONSORED ADR 4,072,809 66,428,000 2.57%
7 DYAX CORP COM CVR 2,857,773 54,555,000 2.11%
8 VANDA PHARMACEUTICALS INC COM 4,784,157 53,965,000 2.09%
9 DAVITA INC 716,000 51,788,000 2.00%
10 MYLAN N V 1,275,000 51,332,000 1.99%
11 Nivalis Therapeutics Inc 3,732,412 48,409,000 1.87%
12 HEALTHWAYS INC 51,925,000 47,869,000 1.85% PRN
13 ARRAY BIOPHARMA INC COM 9,729,361 44,366,000 1.72%
14 Adeptus Health Inc 545,328 44,041,000 1.70%
15 ARRAY BIOPHARMA INC 3 06/01/2020 45,000,000 43,864,000 1.70% PRN
16 EHEALTH INC COM 3,264,588 41,819,000 1.62%
17 BLUEBIRD BIO INCORPORATED 483,000 41,321,000 1.60%
18 WALGREENS BOOTS ALLIANCE INC 463,457 38,513,000 1.49%
19 HEARTWARE INTL INC 39,226,000 37,712,000 1.46% PRN
20 GLOBAL BLOOD THERAPEUTICS IN COM 890,620 37,549,000 1.45%
21 CHARLES RIV LABS INTL INC 581,188 36,917,000 1.43%
22 ENDOLOGIX INC 40,941,000 36,877,000 1.43% PRN
23 GW PHARMACEUTICALS PLC 391,122 35,737,000 1.38%
24 AAC HLDGS INC COM 1,601,376 35,631,000 1.38%
25 TEVA PHARMACEUTICAL INDS LTD 615,000 34,723,000 1.34%
26 MCKESSON CORP 185,646 34,350,000 1.33%
27 UNIVERSAL AMERN CORP NEW 4,930,787 33,727,000 1.30%
28 INFINITY PHARMACEUTICALS INC COM 3,910,721 33,046,000 1.28%
29 TEVA PHARMACEUTICAL INDS LTD 550,000 31,053,000 1.20% Call
30 ACCURAY INC 30,511,000 30,841,000 1.19% PRN
31 SPECTRANETICS CORP 39,831,000 30,252,000 1.17% PRN
32 REGENXBIO INC COM 1,336,542 29,444,000 1.14%
33 PACIRA BIOSCIENCES INC 702,485 28,872,000 1.12%
34 ENDOLOGIX INC 2,347,113 28,776,000 1.11%
35 ProNAi Therapeutics, Inc. 1,348,401 27,669,000 1.07%
36 AKARI THERAPEUTICS PLC 1,150,700 27,611,000 1.07%
37 KEMPHARM INC 1,420,497 27,529,000 1.06%
38 SAGE THERAPEUTICS 649,064 27,468,000 1.06%
39 HEALTHWAYS INC 2,465,042 27,411,000 1.06%
40 ANTARES PHARMA INC 15,451,124 26,267,000 1.02%
41 RITE AID CORP 4,222,800 25,632,000 0.99%
42 FLUIDIGM CORP DEL 35,000,000 25,235,000 0.98% PRN
43 WEBMD HEALTH CORP NOTE 23,000,000 23,640,000 0.91% PRN
44 GENOMIC HEALTH INC COM 1,093,516 23,139,000 0.90%
45 XENCOR INC COM 1,787,000 21,855,000 0.85%
46 IMPRIVATA INC 1,151,140 20,456,000 0.79%
47 ENDOCHOICE HLDGS INC 1,797,709 20,422,000 0.79%
48 RELYPSA INC 1,101,000 20,380,000 0.79%
49 MALLINCKRODT PUB LTD CO SHS 317,931 20,329,000 0.79%
50 ANTHEM INC 140,806 19,713,000 0.76%
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Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0001140361-15-041667, filed 2015.11.16).

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.