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

6 Months Ended

Jun. 30, 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 June 30,				Six Months Ended June 30,
	2022		2023		2022		2023
Market maker:
Citadel Securities, LLC	19	%	12	%	21	%	13	%
Entities affiliated with Susquehanna International Group, LLP(1)	9	%	3	%	11	%	4	%
B2C2 USA Inc.	10	%	2	%	9	%	2	%
All others individually less than 10%	25	%	21	%	27	%	22	%
Total as percentage of total revenue:	63	%	38	%	68	%	41	%

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(1)Consists of Global Execution Brokers, LP and G1 Execution Services, LLC