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Institutional Investment Manager
EcoR1 Capital, LLC
EcoR1 Capital, LLC (CIK: 0001587114) incorporated in Delaware, located at 357 Tehama Street #3, San Francisco, CA. Institutional holdings reported to the SEC.

Institutional Holdings (2016Q4)
Portfolio Summary: 30 holdings with a total value of $299,427,000.
#
Name
Shares
Value ($)
%
Options
Notes
1 IRONWOOD PHARMACEUTICALS INC COM CL A 2,855,515 43,661,000 14.58%
2 GALAPAGOS NV 561,341 36,032,000 12.03%
3 ASSEMBLY BIOSCIENCES INC 2,943,164 35,759,000 11.94%
4 ALEXION PHARMACEUTIC 162,200 19,845,000 6.63%
5 Ascendis Pharma 975,700 19,748,000 6.60%
6 THERAVANCE BIOPHARMA INC 17,000,000 19,327,000 6.45% PRN
7 ARDELYX INC COM 1,310,023 18,602,000 6.21%
8 KURA ONCOLOGY INC 2,611,906 15,410,000 5.15%
9 FIVE PRIME THERAPEUTICS INC 298,712 14,968,000 5.00%
10 ACLARIS THERAPEUTICS INC COM 414,000 11,236,000 3.75%
11 ALLERGAN PLC 50,000 10,501,000 3.51% Call
12 EDITAS MEDICINE INCORPORATED 626,762 10,172,000 3.40%
13 XENCOR INC COM 375,000 9,870,000 3.30%
14 CHIMERIX INC 1,415,687 6,512,000 2.17%
15 FATE THERAPEUTICS INC 2,537,026 6,368,000 2.13%
16 Atara Biotherapeutics Inc 215,812 3,065,000 1.02%
17 ADVERUM BIOTECHNOLOGIES INC 874,447 2,536,000 0.85%
18 KINDRED BIOSCIENCES INC 571,126 2,427,000 0.81%
19 Life Technologies Corp 976,986 2,101,000 0.70%
20 Syndax Pharmaceuticals Inc 273,862 1,964,000 0.66%
21 Egalet Corp 222,300 1,701,000 0.57%
22 Nabriva Therapeutics AG 264,773 1,578,000 0.53%
23 DERMIRA INC 43,200 1,310,000 0.44%
24 AGIOS PHARMACEUTICALS INC 23,300 972,000 0.32%
25 CHEMOCENTRYX INC 118,000 873,000 0.29%
26 SYROS PHARMACEUTICALS INC 63,596 773,000 0.26%
27 CYTOKINETICS INC 54,879 667,000 0.22%
28 BIOPHARMX CORP COM 1,342,000 502,000 0.17%
29 BRISTOL MYERS SQUIBB CO 8,560 500,000 0.17%
30 CASCADIAN THERAPEUTICS INC 103,800 447,000 0.15% Call

Portfolio data is normalized using SEC Form 13F filings, including the Restatement filing (0001140361-17-007745, filed 2017.02.15).

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.