X0206 3 2013-05-08 0 0001463729 Receptos, Inc. RCPT 0001402439 Arch Venture Fund VII LP 8725 WEST HIGGINS ROAD, SUITE 290 CHICAGO IL 60631 0 0 1 0 0001222135 ARCH VENTURE FUND VI LP 8725 WEST HIGGINS ROAD, SUITE 290 CHICAGO IL 60631 0 0 1 0 0001274410 ARCH VENTURE PARTNERS VI LP 8725 WEST HIGGINS ROAD, SUITE 290 CHICAGO IL 60631 0 0 1 0 0001274412 ARCH VENTURE PARTNERS VI LLC 8725 WEST HIGGINS ROAD, SUITE 290 CHICAGO IL 60631 0 0 1 0 0001544444 ARCH Venture Partners VII, L.P. 8725 WEST HIGGINS ROAD, SUITE 290 CHICAGO IL 60631 0 0 1 0 0001544443 ARCH Venture Partners VII, LLC 8725 WEST HIGGINS ROAD, SUITE 290 CHICAGO IL 60631 0 0 1 0 0001219039 CRANDELL KEITH 8725 WEST HIGGINS ROAD, SUITE 290 CHICAGO IL 60631 0 0 1 0 0001219043 BYBEE CLINTON 8725 WEST HIGGINS ROAD, SUITE 290 CHICAGO IL 60631 0 0 1 0 0001219042 NELSEN ROBERT 8725 WEST HIGGINS ROAD, SUITE 290 CHICAGO IL 60631 0 0 1 0 Common Stock 114285 D Series A Preferred Stock 5.25 Common Stock 129755 D Series A Preferred Stock 5.25 Common Stock 1022283 D Series B Preferred Stock 7.73 Common Stock 680323 D The Series A Preferred Stock and the Series B Preferred Stock have no expiration date and are convertible at any time at the option of the holder and will convert upon the closing of the Issuer's initial public offering at a conversion ratio of 1 share of Common Stock for every 7.5 shares of Series A Preferred Stock and Series B Preferred Stock, for no additional consideration. Beneficial ownership consists of: (i) 114,285 shares of common stock held by ARCH Venture Fund VII, L.P. ("ARCH Fund VII"); (ii) an aggregate of 129,755 shares of common stock issuable upon conversion of shares of Series A preferred stock held by ARCH Venture Fund VI, L.P. ("ARCH Fund VI"); and (iii) 1,702,606 shares of common stock issuable upon conversion of shares of Series A preferred stock and Series B preferred stock held by ARCH Fund VII. The sole general partner of ARCH Fund VI is ARCH Venture Partners VI, L.P. ("ARCH Partners VI"), which may be deemed to beneficially own the shares held by ARCH Fund VI. The sole general partner of ARCH Partners VI is ARCH Venture Partners VI, LLC ("ARCH VI LLC"), which may be deemed to beneficially own the shares held by ARCH Fund VI. ARCH Partners VI and ARCH VI LLC disclaim beneficial ownership of such shares, except to the extent of any pecuniary interest therein. The sole general partner of ARCH Fund VII is ARCH Venture Partners VII, L.P. ("ARCH Partners VII"), which may be deemed to be the beneficial owner of the shares held by ARCH Fund VII. The sole general partner of ARCH Partners VII is ARCH Venture Partners VII, LLC ("ARCH VII LLC"), which may be deemed to be the beneficial owner of the shares held by ARCH Fund VII. ARCH Partners VII and ARCH VII LLC disclaim beneficial ownership of such shares, except to the extent of any pecuniary interest therein. The managing directors of ARCH VI LLC and ARCH VII LLC are Keith Crandell, Clinton Bybee and Robert Nelsen, and they may be deemed to beneficially own the shares held by ARCH Fund VI and ARCH Fund VII. Messrs. Crandell, Bybee and Nelsen disclaim beneficial ownership of such shares, except to the extent of any pecuniary interest therein. Exhibit List: Exhibit 24 - Power of Attorney ARCH Venture Fund VI, L.P. By: /s/ Mark McDonnell, as Attorney-in-Fact for Keith Crandell, Managing Director of the general partner of the general partner of ARCH Fund VI 2013-05-08 ARCH Venture Partners VI, L.P. By: /s/ Mark McDonnell, as Attorney-in-Fact for Keith Crandell, Managing Director of the general partner of ARCH Partners VI 2013-05-08 ARCH Venture Partners VI, LLC By: /s/ Mark McDonnell, as Attorney-in-Fact for Keith Crandell, Managing Director of ARCH VI LLC 2013-05-08 ARCH Venture Fund VII, L.P. By: /s/ Mark McDonnell, as Attorney-in-Fact for Keith Crandell, Managing Director of the general partner of the general partner of ARCH Fund VII 2013-05-08 ARCH Venture Partners VII, L.P. By: /s/ Mark McDonnell, as Attorney-in-Fact for Keith Crandell, Managing Director of the general partner of ARCH Partners VII 2013-05-08 ARCH Venture Partners VII, LLC By: /s/ Mark McDonnell, as Attorney-in-Fact for Keith Crandell, Managing Director of ARCH VII LLC 2013-05-08 By: /s/ Mark McDonnell, as Attorney-in-Fact for Keith Crandell 2013-05-08 By: /s/ Mark McDonnell , as Attorney-in-Fact for Clinton Bybee 2013-05-08 By: /s/ Mark McDonnell, as Attorney-in-Fact for Robert Nelsen 2013-05-08