X0306 4 2017-05-11 0 0001569391 KCG Holdings, Inc. KCG 0001695763 WELLER ADRIAN KCG HOLDINGS, INC., 300 VESEY STREET NEW YORK NY 10282 1 0 0 0 Restricted Stock Units 2017-05-11 4 A 0 4023 19.89 A 9893 D Restricted stock units granted pursuant to the KCG Holdings, Inc. Amended and Restated Equity Incentive Plan. Each restricted stock unit represents a contingent right to receive one share of the Class A Common Stock of KCG Holdings, Inc. Restricted stock units are scheduled to vest on May 11, 2018 or upon earlier retirement and will be settled upon vesting. /s/ Robert McQueen as attorney-in-fact for Adrian Weller 2017-05-15