Dark
Light
System
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 (2015Q2)
Portfolio Summary: 25 holdings with a total value of $299,936,000.
#
Name
Shares
Value ($)
%
Options
Notes
1 Atara Biotherapeutics Inc 1,063,189 56,094,000 18.70%
2 EPIZYME INC COM 1,685,800 40,459,000 13.49%
3 ASSEMBLY BIOSCIENCES INC 1,574,107 30,317,000 10.11%
4 FIBROGEN INC COM 1,205,391 28,327,000 9.44%
5 ARRAY BIOPHARMA INC 3 06/01/2020 19,200,000 24,240,000 8.08% PRN
6 KITE PHARMA INCORPORATED 281,400 17,157,000 5.72%
7 FLEX PHARMA INC COM 908,691 15,629,000 5.21%
8 Life Technologies Corp 836,860 15,499,000 5.17%
9 RETROPHIN INC COM 341,650 11,326,000 3.78%
10 KINDRED BIOSCIENCES INC 1,294,431 8,828,000 2.94%
11 COLLEGIUM PHARMACEUTICAL INC COM 465,118 8,298,000 2.77%
12 ARRAY BIOPHARMA INC 11,000 7,931,000 2.64% Call
13 OVASCIENCE INC 2,300 6,654,000 2.22% Call
14 FORWARD PHARMA A/S 158,985 6,049,000 2.02%
15 GENVEC INC 1,986,413 4,052,000 1.35%
16 CELLADON CORP 2,843,170 3,582,000 1.19%
17 CALITHERA BIOSCIENCES INC 415,480 2,967,000 0.99%
18 ARRAY BIOPHARMA INC COM 400,000 2,884,000 0.96%
19 Biotie Therapies Corp. 100,000 1,997,000 0.67%
20 TARGACEPT INC 619,699 1,729,000 0.58%
21 SERES THERAPEUTICS INC 40,000 1,660,000 0.55%
22 QLT INC 400,000 1,652,000 0.55%
23 REGULUS THERAPEUTICS INC 1,280 1,403,000 0.47% Call
24 XENON PHARMACEUTICALS INC 73,000 842,000 0.28%
25 EPIZYME INC 150 360,000 0.12% Call

Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0001140361-15-031882, filed 2015.08.14).

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.