X0206 3 2018-07-18 0 0001434418 CONSTELLATION PHARMACEUTICALS INC CNST 0000315054 REGENTS OF THE UNIVERSITY OF CALIFORNIA 1111 BROADWAY, SUITE 2100 OAKLAND CA 94607 0 0 1 0 Series E Preferred Stock Common Stock 778583 D Series E-1 Preferred Stock Common Stock 590684 D Series F Preferred Stock Common Stock 794806 D The Series E Preferred Stock is convertible into Common Stock on a 8.56256-for-one basis into the number of shares of Common Stock shown in Column 3 at any time at the holder's election and automatically upon the closing of the Issuer's initial public offering without payment of further consideration. The shares have no expiration date. The Series E-1 Preferred Stock is convertible into Common Stock on a 11.009-for-one basis into the number of shares of Common Stock shown in Column 3 at any time at the holder's election and automatically upon the closing of the Issuer's initial public offering without payment of further consideration. The shares have no expiration date. The Series F Preferred Stock is convertible into Common Stock on a 11.009-for-one basis into the number of shares of Common Stock shown in Column 3 at any time at the holder's election and automatically upon the closing of the Issuer's initial public offering without payment of further consideration. The shares have no expiration date. /s/ Arthur R. Guimaraes 2018-07-18