Exhibit 99.1

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, the undersigned agree to the joint filing of a Statement on Schedule 13D (including any and all amendments thereto) with respect to the Common Stock, par value $.01 per share, of TradeStation Group, Inc. and further agree to the filing of this agreement as an Exhibit thereto. In addition, each party to this Agreement expressly authorizes each other party to this Agreement to file on its behalf any and all amendments to such Statement on Schedule 13D.

Dated:  June 13, 2011	IBG LLC By: /s/ Thomas Peterffy        Name: Thomas Peterffy        Title:   President
Dated:  June 13, 2011	IBG HOLDINGS LLC By: /s/ Thomas Peterffy        Name: Thomas Peterffy        Title:   Managing Member
Dated:  June 13, 2011	By: /s/ Thomas Peterffy        Thomas Peterffy