EcoR1 Capital, LLC

Q3 2015 13F Holdings Report, Options Holdings

Notable people: Oleg Nodelman
Signature - Title: Sarah Marriott - Chief Compliance Officer
Location: San Francisco, CA
Options holdings as of: 30 Sep 2015
Notional value: $1,382,000
Number of holdings: 3
Filing time: 16 Nov 2015, 11:51:44 UTC
Description: All US holdings of this investor are reported in this report.
Previous filing: Q2 2015 - 14 Aug 2015
Next filing: Q4 2015 - 16 Feb 2016
Stock holdings: Showing options holdings, see here for stock holdings

Sym	Company	Class	Option	Share Change	Activity	* Price $	Shares	Notional Value

Filing 2015 Q3 compared to 2015 Q2 by default. Changes are calculated vs the previous SEC filing.

Compare Q3 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 Nov 2015