EXHIBIT 99.1

JOINT FILING AGREEMENT

The undersigned acknowledge and agree that the foregoing statement on Schedule 13G is filed on behalf of each of the undersigned and that all subsequent amendments to this statement on Schedule 13G may be filed on behalf of each of the undersigned without the necessity of filing additional joint filing agreements. The undersigned acknowledge that each shall be responsible for the timely filing of such amendments, and for the completeness and accuracy of the information concerning him or it contained herein and therein, but shall not be responsible for the completeness and accuracy of the information concerning the others, except to the extent that he or it knows or has reason to believe that such information is inaccurate.

DEUTSCHE BOERSE AG
/s/ Daniel Mirtschink	July 6, 2016
Name: Daniel Mirtschink	Date:
Title:   Head of Markets Legal
/s/ Martin Loll	July 6, 2016
Name: Martin Loll	Date:
Title:   Legal Counsel
DEUTSCHE BOERSE SYSTEMS, INC.
/s/ Daniel Mirtschink	July 6, 2016
Name: Daniel Mirtschink	Date:
Title:   Attorney-in-fact
/s/ Martin Loll	July 6, 2016
Name: Martin Loll	Date:
Title:   Attorney-in-fact