UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, DC 20549
SCHEDULE 14A
Proxy Statement Pursuant to Section 14(a) of
the Securities Exchange Act of 1934
(Amendment No. )
Filed by the Registrant ☒
Filed by a Party other than the Registrant ☐
Check the appropriate box:
| ☐ | Preliminary Proxy Statement |
| ☐ | Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) |
| ☐ | Definitive Proxy Statement |
| ☒ | Definitive Additional Materials |
| ☐ | Soliciting Material Pursuant to §240.14a-12 |
| INTERACTIVE BROKERS GROUP, INC. |
| (Name of Registrant as Specified in Its Charter) |
| (Name of Person(s) Filing Proxy Statement, if other than the Registrant) |
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