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: 30 Jun 2015
Value $: $283,588,000
Num holdings: 21
Filing time: 14 Aug 2015, 10:30:48 UTC
Form type: 13F-HR
Description: All US holdings of this investor are reported in this report. Top holdings included ATRA, EPZM, ASMB, FGEN, and ARRAY BIOPHARMA SR CONV NT 3.000% Due 06/01/2020.
Previous filing: Q1 2015 - 18 May 2015
Next filing: Q3 2015 - 16 Nov 2015
SEC: View on sec.gov
Options Holdings: Showing stock holdings, see here for options holdings

Sym	Weight	Trade Impact	Company	Class	Share Change	Activity	Value Change $	Value $	* Price $	Shares	Principal

Filing 2015 Q2 compared to 2015 Q1 - Restatement by default. Changes are calculated vs the previous SEC filing.

Compare Q2 2015 to

* 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	13 Aug 2015