X0206 3 2018-07-18 0 0001434418 CONSTELLATION PHARMACEUTICALS INC CNST 0001746218 Spur Ventures II, LP C/O SPUR CAPITAL PARTNERS, LLC 2370 NOWATA PLACE BARTLESVILLE OK 74006 0 0 1 0 0001303109 Spur Capital Partners LLC 2370 NOWATA PLACE BARTLESVILLE OK 74006 0 0 1 0 Series E Preferred Stock Common Stock 103811 D Series E-1 Preferred Stock Common Stock 109788 D Series F Preferred Stock Common Stock 136254 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 securities are directly held by Spur Ventures II, L.P., and indirectly held by Spur Capital Partners, LLC, the manager of Spur Ventures II, L.P. Spur Capital Management II, LLC is the general partner of Spur Ventures II, L.P. Spur Capital Partners, LLC may be deemed to have voting and investment power with respect to such shares. 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/ Teri Hightower 2018-07-18