All statements, requests and notices delivered hereunder shall be in writing, and if to KCG shall be delivered or sent by mail or e-mail transmission to KCG Holdings, Inc., 300 Vesey Street, New York, NY 10282, Attention: John McCarthy, e-mail: jmccarthy@kcg.com; and if to GA-GTCO shall be delivered or sent by mail or e-mail transmission to GA-GTCO Interholdco, LLC, c/o General Atlantic Service Company, LLC, 55 East 52nd Street, 32nd Floor, New York, NY 10055, Attention: David A. Rosenstein, e-mail: drosenstein@generalatlantic.com.