DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

3 Months Ended

Mar. 31, 2022

We derived transaction-based revenues from individual market makers in excess of 10% of total revenues, as follows:


	Three Months Ended March 31,
		2021		2022
Market maker:
Citadel Securities, LLC		27	%	22	%

Entities affiliated with Susquehanna International Group, LLP(1)		12	%	12	%

Entities affiliated with Wolverine Holdings, L.P.(2)		9	%	10	%





All others individually less than 10%		33	%	28	%
Total as percentage of total revenue:		81	%	72	%

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(1)Consists of Global Execution Brokers, LP and G1X Execution Services, LLC

(2)Consists of Wolverine Execution Services, LLC and Wolverine Securities LLC