EcoR1 Capital, LLC

Q2 2017 13F Holdings Report, Options Holdings

Notable people: Oleg Nodelman
Signature - Title: Oleg Nodelman - Manager
Location: San Francisco, CA
Options holdings as of: 30 Jun 2017
Notional value: $129,684,000
Number of holdings: 4
Filing time: 14 Aug 2017, 16:25:24 UTC
Description: All US holdings of this investor are reported in this report.
Previous filing: Q1 2017 - 19 May 2017
Next filing: Q3 2017 - 14 Nov 2017
Stock holdings: Showing options holdings, see here for stock holdings

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

Filing 2017 Q2 compared to 2017 Q1 - Restatement by default. Changes are calculated vs the previous SEC filing.

Compare Q2 2017 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
Oleg Nodelman	Manager	San Francisco, California	14 Aug 2017