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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 (2015Q4)
Portfolio Summary: 31 holdings with a total value of $318,400,000.
#
Name
Shares
Value ($)
%
Options
Notes
1 FIBROGEN INC COM 1,216,473 37,066,000 11.64%
2 FIVE PRIME THERAPEUTICS INC 719,000 29,839,000 9.37%
3 JAZZ PHARMACEUTICALS PLC 189,200 26,594,000 8.35% Call
4 RETROPHIN INC COM 1,224,384 23,618,000 7.42%
5 ARRAY BIOPHARMA INC 3 06/01/2020 22,534 21,633,000 6.79% PRN
6 KURA ONCOLOGY INC 2,450,000 20,580,000 6.46%
7 ASSEMBLY BIOSCIENCES INC 2,098,302 15,758,000 4.95%
8 CYTOKINETICS INC 1,418,700 14,840,000 4.66%
9 VALEANT PHARMACEUTICALS INTL 126,500 12,859,000 4.04% Call
10 COLLEGIUM PHARMACEUTICAL INC COM 465,118 12,791,000 4.02%
11 EPIZYME INC COM 698,900 11,196,000 3.52%
12 GALAPAGOS NV 167,361 10,524,000 3.31%
13 KITE PHARMA INCORPORATED 166,000 10,229,000 3.21%
14 FLEX PHARMA INC COM 795,088 9,899,000 3.11%
15 IRONWOOD PHARMACEUTICALS INC COM CL A 821,531 9,522,000 2.99%
16 Nabriva Therapeutics AG 838,680 7,931,000 2.49%
17 Life Technologies Corp 790,462 7,770,000 2.44%
18 KINDRED BIOSCIENCES INC 1,432,765 4,871,000 1.53%
19 RETROPHIN INC 244,100 4,709,000 1.48% Call
20 CELLADON CORP 2,843,170 4,179,000 1.31%
21 OVASCIENCE INC COM 424,979 4,152,000 1.30%
22 GENVEC INC 1,920,913 3,534,000 1.11%
23 CALITHERA BIOSCIENCES INC 415,480 3,183,000 1.00%
24 CYTOKINETICS INC 284,600 2,977,000 0.93% Call
25 ZAFGEN INC COM 369,000 2,321,000 0.73%
26 FORWARD PHARMA A/S 100,017 1,900,000 0.60%
27 AKARI THERAPEUTICS PLC 100,750 1,461,000 0.46%
28 GILEAD SCIENCES INC 11,800 1,194,000 0.38% Call
29 Nephrogenex Inc 588,235 941,000 0.30%
30 QLT INC 100,000 266,000 0.08%
31 ZAFGEN INC 10,000 63,000 0.02% Call

Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0001140361-16-052684, filed 2016.02.16).

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.