X0203 3 2010-05-24 0 0001471261 Cobalt International Energy, Inc. CIE 0001180363 MARSHALL JON A C/O TWO POST OAK CENTRAL 1980 POST OAK BOULEVARD, SUITE 1200 HOUSTON TX 77056 1 0 0 0 Common Stock 0 D No securities are beneficially owned. /s/ Jeffrey A. Starzec 2010-06-02