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Institutional Investment Manager
Palo Alto Investors LP
Palo Alto Investors LP (CIK: 0001306923) incorporated in California, located at 101 University Ave, Palo Alto, CA. Institutional holdings reported to the SEC.

Institutional Holdings (2016Q1)
Portfolio Summary: 44 holdings with a total value of $1,288,268,000.
#
Name
Shares
Value ($)
%
Options
Notes
1 ABIOMED INC 2,325,959 220,524,000 17.12%
2 UNITED THERAPEUTICS 1,525,654 170,004,000 13.20%
3 Anacor Pharmaceuticals Inc 2,219,042 118,608,000 9.21%
4 BIOMARIN 1,340,347 110,552,000 8.58%
5 AMAG PHARMACEUTICALS INC COM 2,906,194 68,005,000 5.28%
6 CLOVIS ONCOLOGY INC 3,461,365 66,458,000 5.16%
7 INSMED INC COM PAR .01 4,790,800 60,699,000 4.71%
8 Wright Medical Group NV 2,190,957 36,370,000 2.82%
9 VANDA PHARMACEUTICALS INC COM 4,030,908 33,698,000 2.62%
10 EPIZYME INC COM 2,655,479 32,184,000 2.50%
11 AMICUS THERAPEUTICS INC 3,551,173 30,007,000 2.33%
12 PROTHENA CORP PLC 695,518 28,628,000 2.22%
13 GILEAD SCIENCES INC 302,900 27,824,000 2.16%
14 KARYOPHARM THERAPEUTICS INC COM 3,098,145 27,635,000 2.15%
15 CELGENE CORP 270,800 27,104,000 2.10%
16 MEDIVATION INC 525,462 24,161,000 1.88%
17 ENDO INTL 828,630 23,326,000 1.81%
18 CEMPRA INC 1,215,833 21,301,000 1.65%
19 STAAR SURGICAL CO 2,641,875 19,523,000 1.52%
20 SHIRE PLC 106,100 18,239,000 1.42%
21 ZELTIQ AESTHETICS INCORPORATED 573,636 15,580,000 1.21%
22 ARIAD PHARMACEUTICALS INC 2,248,317 14,367,000 1.12%
23 SEQUENOM INC 10,023,842 14,134,000 1.10%
24 Momenta Pharmaceuticals Inc 1,468,776 13,571,000 1.05%
25 ACADIA PHARMACEUTICALS INC COM 485,100 13,563,000 1.05%
26 RIGEL PHARMACEUTICAL INC 5,230,919 10,880,000 0.84%
27 Heartware International, Inc. 251,868 7,914,000 0.61%
28 ALIMERA SCIENCES INC 3,013,793 5,274,000 0.41%
29 AIMMUNE THERAPEUTICS INC COM 325,599 4,415,000 0.34%
30 ACELRX PHARMACEUTICALS INC 1,425,439 4,390,000 0.34%
31 Sunesis Pharmaceuticals I 6,974,854 3,766,000 0.29%
32 EXACT SCIENCES CORP 396,276 2,671,000 0.21%
33 IDERA PHARMACEUTICALS INC 1,257,748 2,490,000 0.19%
34 ALIGN TECHNOLOGY INC 27,757 2,018,000 0.16%
35 INTREXON CORP 47,100 1,596,000 0.12%
36 Dicerna Pharmaceuticals 267,890 1,436,000 0.11%
37 HISTOGENICS CORP 454,545 1,041,000 0.08%
38 ALCOBRA LTD 254,188 963,000 0.07%
39 Orexigen Therapeutics, Inc. 1,673,024 941,000 0.07%
40 CYTOKINETICS INC 123,686 872,000 0.07%
41 SOPHIRIS BIO INC 494,000 711,000 0.06%
42 MARINUS PHARMACEUTICALS INC 59,017 318,000 0.02%
43 ZOGENIX INC 28,600 264,000 0.02%
44 UNIQURE NV 20,453 243,000 0.02%

Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0001306923-16-000048, filed 2016.05.16).

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.