EcoR1 Capital, LLC

Q2 2015 13F Holdings Report, Stock Holdings

Notable people: Oleg Nodelman
Signature - Title: Sarah Marriott - Chief Compliance Officer
Location: San Francisco, CA
Holdings as of: June 30, 2015
Value $: $284M
Num holdings: 21
Date filed: 8/14/2015, 10:30 AM
Form type: 13F-HR
Description: All US holdings of this investor are reported in this report. Top holdings included ATRA, EPZM, ASMB, FGEN, and KITE.
Previous filing: Q1 2015 - May 18, 2015
Next filing: Q3 2015 - Nov 16, 2015
SEC: View on sec.gov
Options Holdings: Showing stock holdings, see here for options holdings

Sym	Weight	Trade Impact	Company	Class	Shares Change	Activity	Value Change $	Value $	* Price $	Shares	Principal
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* Reported Price is the price of the security as of the portfolio date. This value is significant in that it is the last known price at which the security was still held.
An asterisk sign (*) next to the price indicates that the price is likely invalid.

Person Signing this Report on Behalf of Reporting Manager:

Name	Title	City, State	Date
Sarah Marriott	Chief Compliance Officer	San Francisco, California	8/13/2015