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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 (2016Q1)
Portfolio Summary: 37 holdings with a total value of $286,194,000.
#
Name
Shares
Value ($)
%
Options
Notes
1 IRONWOOD PHARMACEUTICALS INC COM CL A 2,061,417 22,552,000 7.88%
2 FIVE PRIME THERAPEUTICS INC 500,757 20,346,000 7.11%
3 EPIZYME INC COM 1,598,900 19,379,000 6.77%
4 FIBROGEN INC COM 863,745 18,389,000 6.43%
5 ARRAY BIOPHARMA INC 3 06/01/2020 22,534,000 18,140,000 6.34% PRN
6 RETROPHIN INC COM 1,225,084 16,735,000 5.85%
7 SPDR SERIES TRUST 297,200 15,353,000 5.36% Call
8 CYTOKINETICS INC 2,052,800 14,472,000 5.06%
9 GILEAD SCIENCES INC 150,000 13,779,000 4.81% Call
10 ASSEMBLY BIOSCIENCES INC 2,098,302 10,533,000 3.68%
11 CELATOR PHARMACEUTICALS INC 950,000 10,479,000 3.66%
12 GALAPAGOS NV 246,691 10,317,000 3.60%
13 KURA ONCOLOGY INC 2,465,286 9,984,000 3.49%
14 COLLEGIUM PHARMACEUTICAL INC COM 473,123 8,587,000 3.00%
15 ACCELERON PHARMA 270,289 7,133,000 2.49%
16 AIMMUNE THERAPEUTICS INC COM 521,366 7,070,000 2.47%
17 ENANTA PHARMACEUTICALS INC COM 240,383 7,060,000 2.47%
18 KITE PHARMA INCORPORATED 150,000 6,887,000 2.41%
19 Syndax Pharmaceuticals Inc 510,829 6,804,000 2.38%
20 Nabriva Therapeutics AG 707,817 6,342,000 2.22%
21 FLEX PHARMA INC COM 575,925 6,318,000 2.21%
22 KINDRED BIOSCIENCES INC 1,432,765 4,943,000 1.73%
23 LOXO ONCOLOGY INC COM 150,308 4,109,000 1.44%
24 IRONWOOD PHARMACEUTICALS INC 300,000 3,282,000 1.15% Call
25 EIGER BIOPHARMACEUTICALS INC 189,545 3,179,000 1.11%
26 EDITAS MEDICINE INCORPORATED 87,921 3,037,000 1.06%
27 IMMUNOGEN INC 299,500 2,552,000 0.89% Call
28 CYTOKINETICS INC 250,000 1,763,000 0.62% Call
29 FORWARD PHARMA A/S 97,024 1,649,000 0.58%
30 ARRAY BIOPHARMA INC 520,000 1,534,000 0.54% Call
31 AKARI THERAPEUTICS PLC 92,303 1,292,000 0.45%
32 TARGACEPT INC 669,166 669,000 0.23% PRN
33 BEIGENE LTD 15,766 462,000 0.16%
34 GLOBAL BLOOD THERAPEUTICS IN COM 28,032 445,000 0.16%
35 Life Technologies Corp 74,959 295,000 0.10%
36 SPARK THERAPEUTICS INC 8,700 257,000 0.09%
37 ZAFGEN INC 10,000 67,000 0.02% Call

Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0001140361-16-065705, 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.