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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

6 Months Ended

Jun. 30, 2023

Accounting Policies [Abstract]

Schedule of cash and cash equivalents

Cash, cash equivalents and restricted cash consist of the following:

			June 30, 2023						December 31, 2022
Cash and cash equivalents			$	107,581					$	268,618
Restricted cash			2,321						2,308
Total cash, cash equivalents and restricted cash			$	109,902					$	270,926

Restrictions on cash and cash equivalents

Cash, cash equivalents and restricted cash consist of the following:

			June 30, 2023						December 31, 2022
Cash and cash equivalents			$	107,581					$	268,618
Restricted cash			2,321						2,308
Total cash, cash equivalents and restricted cash			$	109,902					$	270,926

Schedule of securities and other investments owned and securities sold not yet purchased at fair value

As of June 30, 2023 and December 31, 2022, the Company’s securities and other investments owned and securities sold not yet purchased at fair value consisted of the following securities:

			June 30, 2023						December 31, 2022
Securities and other investments owned:
Equity securities			$	963,817					$	1,046,710
Corporate bonds			62,977						8,539
Other fixed income securities			5,093						3,956
Partnership interests and other			40,557						70,063
			$	1,072,444					$	1,129,268
Securities sold not yet purchased:
Equity securities			$	951					$	4,466
Corporate bonds			703						1,162
Other fixed income securities			1,032						269
			$	2,686					$	5,897

Equity method investments

			March 31, 2023						September 30, 2022
Total assets			$	189,999					$	202,520
Total liabilities			$	9,579					$	5,737
Equity attributable to investee			$	180,420					$	196,783

			For the three months ended March 31,												For the six months ended March 31,
			2023						2022						2023						2022
Revenues			$	16,457					$	21,674					$	44,428					$	48,883
Net income attributable to investees			$	10,878					$	18,853					$	22,686					$	31,735

			March 31, 2023						September 30, 2022
Total assets			$	986,420					$	881,567
Total liabilities			$	978,626					$	898,695
Equity attributable to investee			$	(10,206)					$	(17,128)

			For the three months ended March 31,												For the six months ended March 31,
			2023						2022						2023						2022
Revenues			$	257,247					$	204,049					$	507,124					$	396,344
Net (loss) income attributable to investees			$	(16,211)					$	(11,979)					$	(14,190)					$	13,895

Schedule of financial assets and liabilities measured on recurring basis

The following tables present information on the financial assets and liabilities measured and recorded at fair value on a recurring basis as of June 30, 2023 and December 31, 2022.

			Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis as of June 30, 2023 Using
			Fair value as of June 30, 2023						Quoted prices in active markets for identical assets  (Level 1)						Other observable inputs  (Level 2)						Significant unobservable inputs  (Level 3)
Assets:
Securities and other investments owned:
Equity securities			$	874,858					$	487,728					$	—					$	387,130
Corporate bonds			62,977						57,081						5,896						—
Other fixed income securities			5,093						—						5,093						—
Total securities and other investments owned			942,928						544,809						10,989						387,130
Loans receivable, at fair value			683,827						—						—						683,827
Total assets measured at fair value			$	1,626,755					$	544,809					$	10,989					$	1,070,957
Liabilities:
Securities sold not yet purchased:
Equity securities			$	951					$	951					$	—					$	—
Corporate bonds			703						—						703						—
Other fixed income securities			1,032						—						1,032						—
Total securities sold not yet purchased			2,686						951						1,735						—
Mandatorily redeemable noncontrolling interests issued after November 5, 2003			4,352						—						—						4,352
Contingent consideration			27,724						—						—						27,724
Total liabilities measured at fair value			$	34,762					$	951					$	1,735					$	32,076

			Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis at December 31, 2022 Using
			Fair value at December 31, 2022						Quoted prices in active markets for identical assets  (Level 1)						Other observable inputs  (Level 2)						Significant unobservable inputs  (Level 3)
Assets:
Funds held in trust account			$	174,437					$	174,437					$	—					$	—
Securities and other investments owned:
Equity securities			952,601						584,136						—						368,465
Corporate bonds			8,539						—						8,539						—
Other fixed income securities			3,956						—						3,956						—
Total securities and other investments owned			965,096						584,136						12,495						368,465
Loans receivable, at fair value			701,652						—						—						701,652
Total assets measured at fair value			$	1,841,185					$	758,573					$	12,495					$	1,070,117
Liabilities:
Securities sold not yet purchased:
Equity securities			$	4,466					$	4,466					$	—					$	—
Corporate bonds			1,162						—						1,162						—
Other fixed income securities			269						—						269						—
Total securities sold not yet purchased			5,897						4,466						1,431						—
Mandatorily redeemable noncontrolling interests issued after November 5, 2003			4,648						—						—						4,648
Warrant liabilities			173						173						—						—
Contingent consideration			31,046						—						—						31,046
Total liabilities measured at fair value			$	41,764					$	4,639					$	1,431					$	35,694

Schedule of fair value measurement inputs and valuation techniques

The following table summarizes the significant unobservable inputs in the fair value measurement of Level 3 financial assets and liabilities by category of investment and valuation technique as of June 30, 2023 and December 31, 2022:

			Fair value at June 30, 2023						Valuation Technique						Unobservable Input						Range						Weighted Average
Assets:
Equity securities			$	309,614					Market approach						Multiple of EBITDA						1.5x - 16.0x						6.9x
															Multiple of Sales						2.9x - 3.8x						3.2x
															Market price of related security						$0.01 - $79.15						$3.04
			66,218						Discounted cash flow						Market interest rate						13.5% - 20.8%						20.4%
			11,298						Option pricing model						Annualized volatility						25.0% - 535.0%						95.0%
Loans receivable at fair value			659,979						Discounted cash flow						Market interest rate						9.0% - 23.6%						16.9%
			23,848						Market approach						Market price of related security						$10.37						$10.37
Total level 3 assets measured at fair value			$	1,070,957
Liabilities:
Mandatorily redeemable noncontrolling interests issued after November 5, 2003			$	4,352					Market approach						Operating income multiple						6.0x						6.0x
Contingent consideration			27,724						Discounted cash flow						EBITDA volatility						70%						70%
															Asset volatility						69.0%						69.0%
															Market interest rate						8.5%						8.5%
															Revenue volatility						5.1%						5.1%
Total level 3 liabilities measured at fair value			$	32,076

			Fair value at December 31, 2022						Valuation Technique						Unobservable Input						Range						Weighted  Average
Assets:
Equity securities			$	304,172					Market approach						Multiple of EBITDA						1.5x - 10.5x						6.0x
															Multiple of Sales						3.0x						3.0x
															Market price of related security						$10.01 - $18.88						$16.91
			57,267						Discounted cash flow						Market interest rate						23.8%						23.8%
			7,026						Option pricing model						Annualized volatility						0.3% - 26.1%						70.0%
Loans receivable at fair value			694,499						Discounted cash flow						Market interest rate						6.0% - 83.5%						23.9%
			7,153						Market approach						Multiple of EBITDA						4.5x						4.5x
Total level 3 assets measured at fair value			$	1,070,117
Liabilities:
Mandatorily redeemable noncontrolling interests issued after November 5, 2003			$	4,648					Market approach						Operating income multiple						6.0x						6.0x
Contingent consideration			31,046						Discounted cash flow						EBITDA volatility						80.0%						80.0%
															Asset volatility						69.0%						69.0%
															Market interest rate						8.5%						8.5%
Total level 3 liabilities measured at fair value			$	35,694

Schedule of fair value measurement of level 3 financial assets and liabilities

The changes in Level 3 fair value hierarchy during the three months ended June 30, 2023 and 2022 were as follows:

			Level 3 Balance at Beginning of Period						Level 3 Changes During the Period																								Level 3 Balance at End of Period
									Fair Value Adjustments (1)						Relating to Undistributed Earnings						Purchases, Sales and Settlements						Transfer in and/or out of Level 3
Three Months Ended June 30, 2023
Equity securities			$	359,041					$	17,287					$	12					$	10,918					$	(128)					$	387,130
Loans receivable at fair value			772,085						9,207						(1,281)						(95,934)						(250)						683,827
Mandatorily redeemable noncontrolling interests issued after November 5, 2003			4,654						—						470						(772)						—						4,352
Contingent consideration			28,884						(1,123)						—						(37)						—						27,724
Three Months Ended June 30, 2022
Equity securities			$	388,664					$	(19,504)					$	—					$	(1,489)					$	(33,755)					$	333,916
Loans receivable at fair value			882,391						(10,984)						2,135						(61,865)						(40,837)						770,840
Mandatorily redeemable noncontrolling interests issued after November 5, 2003			4,502						—						221						(563)						—						4,160
Contingent consideration			22,464						(4,500)						—						(242)						—						17,722

(1) - Fair value adjustments represent realized and unrealized gains (losses) of which $13,932 relating to equity securities and $9,207 relating to loans receivable, at fair value were included in trading income (loss) and fair value adjustments on loans and $3,355 relating to equity securities were included in realized and unrealized gains (losses) on investments in the condensed consolidated statement of operations.

The changes in Level 3 fair value hierarchy during the six months ended June 30, 2023 and 2022 were as follows:

			Level 3 Balance at Beginning of Year						Level 3 Changes During the Period																								Level 3 Balance at End of Period
									Fair Value Adjustments (1)						Relating to Undistributed Earnings						Purchases, Sales and Settlements						Transfer in and/or out of Level 3
Six Months Ended June 30, 2023
Equity securities			$	368,465					$	8,271					$	12					$	17,405					$	(7,023)					$	387,130
Loans receivable at fair value			701,652						52,666						(1,050)						(69,191)						(250)						683,827
Mandatorily redeemable noncontrolling interests issued after November 5, 2003			4,648						—						778						(1,074)						—						4,352
Contingent consideration			31,046						(4,570)						—						1,248						—						27,724
Six Months Ended June 30, 2022
Equity securities			$	377,549					$	(24,047)					$	—					$	18,423					$	(38,009)					$	333,916
Loans receivable at fair value			873,186						(47)						5,373						(66,835)						(40,837)						770,840
Mandatorily redeemable noncontrolling interests issued after November 5, 2003			4,506						—						468						(814)						—						4,160
Contingent consideration			—						(4,500)						—						22,222						—						17,722

(1) - Fair value adjustments represent realized and unrealized gains (losses) of which $13,920 relating to equity securities and $52,666 relating to loans receivable, at fair value were included in trading income (loss) and fair value adjustments on

loans and $(5,649) relating to equity securities were included in realized and unrealized gains (losses) on investments in the condensed consolidated statement of operations.

Schedule of financial assets measured on nonrecurring basis

The following table presents information on the assets measured at fair value on a nonrecurring basis by level within the fair value hierarchy as of June 30, 2023 and December 31, 2022. These investments were measured due to an observable price change or impairment during the periods below.

			Fair Value Measurement Using
			Total						Quoted prices in active markets for identical assets  (Level 1)						Other observable inputs  (Level 2)						Significant unobservable inputs  (Level 3)
As of June 30, 2023
Investments in nonpublic entities that do not report NAV			$	1,476					$	—					$	1,476					$	—
As of December 31, 2022
Investments in nonpublic entities that do not report NAV			$	20,251					$	—					$	18,659					$	1,592

Redeemable noncontrolling interest

Changes to redeemable noncontrolling interest consist of the following:

															Six Months Ended June 30, 2023
Balance, December 31, 2022															$	178,622
Net loss															(146)
Purchase of Lingo minority interest															(11,190)
Remeasurement adjustments for Lingo and BRPM 250															8,477
Redemption of BRPM 250 Class A common stock															(175,763)
Balance, June 30, 2023															$	—

Schedule of investments in the VIE

The carrying value of the Company’s investments in the VIEs that were not consolidated is shown below.

			June 30, 2023						December 31, 2022
Securities and other investments owned, at fair value			$	35,465					$	33,743
Loans receivable, at fair value			54,718						46,700
Other assets			3,941						3,755
Maximum exposure to loss			$	94,124					$	84,198

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