Interactive Brokers (IBKR) 10-K 2013 FY Annual report

QuickLinks -- Click here to rapidly navigate through this document

EXHIBIT 21.1

SUBSIDIARIES OF THE COMPANY

Name	Jurisdiction of Organization
IBG LLC	Connecticut, U.S.A.

The following is a list of subsidiaries of IBG LLC:

Name	Jurisdiction of Organization
Timber Hill LLC(1)	Connecticut, U.S.A.
Interactive Brokers LLC(2)	Connecticut, U.S.A.
Interactive Brokers Canada Inc.	Canada
Interactive Brokers (U.K.) Limited	United Kingdom
Timber Hill Europe AG	Switzerland
Timber Hill Securities Hong Kong Limited	Hong Kong
Timber Hill Australia Pty Limited	Australia
Timber Hill Canada Company	Canada
Interactive Brokers Hungary Kft	Hungary
IB Exchange Corp.	Delaware, U.S.A.
Interactive Brokers (India) Private Limited(3)	India
Interactive Brokers Financial Products S.A.	Luxembourg
Interactive Brokers Securities Japan, Inc.	Japan
Interactive Brokers Software Services Estonia	Estonia
Interactive Brokers Software Services Russia	Russia

(1)

IBG LLC owns 99.99% and Thomas Peterffy owns 0.01%.

(2)

IBG LLC owns 99.9% and Thomas Peterffy owns 0.1%.

(3)

IB Exchange Corp. owns 0.01%

The following is a list of subsidiaries of Interactive Brokers LLC:

Name	Jurisdiction of Organization
Interactive Brokers Corp.	Connecticut, U.S.A.

QuickLinks

EXHIBIT 21.1

SUBSIDIARIES OF THE COMPANY