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

3 Months Ended

Mar. 31, 2023

Accounting Policies [Abstract]

Schedule of Concentration of Credit Risk

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

	Three Months Ended March 31,
	2022		2023
Market maker:
Citadel Securities, LLC	22	%	13	%
Entities affiliated with Susquehanna International Group, LLP(1)	12	%	5	%
Entities affiliated with Wolverine Holdings, L.P.(2)	10	%	5	%
All others individually less than 10%	28	%	22	%
Total as percentage of total revenue:	72	%	45	%

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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