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

9 Months Ended

Sep. 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 September 30,				Nine Months Ended September 30,
	2022		2023		2022		2023
Market maker:
Citadel Securities, LLC	12	%	11	%	17	%	12	%
All others individually less than 10%	44	%	26	%	46	%	28	%
Total as percentage of total revenue:	56	%	37	%	63	%	40	%