RECEPTOS INC

CUSIP: 756207106 Class: COMMON STOCK

EcoR1 Capital, LLC's Holding History (CIK: 0001587114)

Note: Option positions (PUT/CALL) are excluded.

Q1 2015
Shares 151,301 Value ($000) $24,948 Avg Close — Range —
Q4 2014
Shares 145,801 Value ($000) $17,862 Avg Close — Range —