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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 (2016Q3)
Portfolio Summary: 31 holdings with a total value of $325,892,000.
#
Name
Shares
Value ($)
%
Options
Notes
1 IRONWOOD PHARMACEUTICALS INC COM CL A 2,810,315 44,628,000 13.69%
2 GALAPAGOS NV 500,576 32,367,000 9.93%
3 BRISTOL MYERS SQUIBB CO 500,000 26,960,000 8.27% Call
4 ASSEMBLY BIOSCIENCES INC 2,943,164 21,220,000 6.51%
5 DERMIRA INC 522,000 17,654,000 5.42%
6 ARDELYX INC COM 1,310,023 16,952,000 5.20%
7 KURA ONCOLOGY INC 2,611,906 16,324,000 5.01%
8 FIVE PRIME THERAPEUTICS INC 286,612 15,044,000 4.62%
9 FIBROGEN INC COM 686,184 14,204,000 4.36%
10 GILEAD SCIENCES INC 150,000 11,868,000 3.64% Call
11 ALLERGAN PLC 50,000 11,516,000 3.53% Call
12 AGIOS PHARMACEUTICALS INC 200,000 10,564,000 3.24%
13 PROTEOSTASIS THERAPEUTICS IN 602,315 9,390,000 2.88%
14 EXACT SCIENCES CORP 500,000 9,285,000 2.85% Put
15 ACHAOGEN INC COM 1,679,707 8,046,000 2.47%
16 CYTOKINETICS INC 846,654 7,772,000 2.38%
17 KINDRED BIOSCIENCES INC 1,432,765 7,149,000 2.19%
18 Syndax Pharmaceuticals Inc 357,365 5,418,000 1.66%
19 BEIGENE LTD 163,470 5,037,000 1.55%
20 IRONWOOD PHARMACEUTICALS INC 281,500 4,470,000 1.37% Call
21 Ascendis Pharma 219,200 4,406,000 1.35%
22 SPARK THERAPEUTICS INC 68,600 4,120,000 1.26%
23 ADVERUM BIOTECHNOLOGIES INC 946,263 3,889,000 1.19%
24 Nabriva Therapeutics AG 548,912 3,870,000 1.19%
25 INTELLIA THERAPEUTICS INC 200,858 3,419,000 1.05%
26 CHIMERIX INC 598,062 3,313,000 1.02%
27 ONCOMED PHARMACEUTICALS INC 265,784 3,038,000 0.93%
28 FATE THERAPEUTICS INC COM 590,527 1,842,000 0.57%
29 CHEMOCENTRYX INC 178,000 1,075,000 0.33%
30 SYROS PHARMACEUTICALS INC 63,596 882,000 0.27%
31 CASCADIAN THERAPEUTICS INC 103,800 170,000 0.05% Call

Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0001140361-16-086430, filed 2016.11.14).

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.