CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 6,166,705	$ 1,402,629
Cash and securities segregated under federal and other regulations	4,468,298	4,914,660
Receivables from brokers, dealers and clearing organizations	124,962	124,501
Receivables from users, net	6,099,497	3,354,142
Deposits with clearing organizations	316,221	225,514
Other current assets	1,674,013	851,138
Total current assets	18,849,696	10,872,584
Property, software and equipment, net	114,666	45,834
Goodwill	95,564	0
Intangible assets, net	35,227	185
Restricted cash	23,773	7,364
Other non-current assets	198,442	62,507
Total assets	19,317,368	10,988,474
Current liabilities:
Accounts payable and accrued expenses	237,147	104,649
Payables to users	6,811,169	5,897,242
Securities loaned	3,129,650	1,921,118
Other current liabilities	1,620,452	893,036
Total current liabilities	11,798,418	8,816,045
Other non-current liabilities	134,368	48,012
Total liabilities	11,932,786	8,864,057
Commitments and contingencies (Note 16)
Mezzanine equity
Carrying Value of Stock, Net of Issuance Costs	0	2,179,739
Stockholders’ (deficit) equity:
Preferred stock, $0.0001 par value. No shares authorized, issued and outstanding as of December 31, 2020; 210,000,000 shares authorized and no shares issued and outstanding as of September 30, 2021.	0	0
Common stock, value	0	1
Additional paid-in capital	10,837,381	134,307
Accumulated other comprehensive income	383	473
Accumulated deficit	(3,453,268)	(190,103)
Total stockholders’ (deficit) equity	7,384,582	(55,322)
Total liabilities, mezzanine equity and stockholders’ (deficit) equity	19,317,368	10,988,474
Common Class A
Stockholders’ (deficit) equity:
Common stock, value	73	0
Common Class B
Stockholders’ (deficit) equity:
Common stock, value	13	0
Common Class C
Stockholders’ (deficit) equity:
Common stock, value	$ 0	$ 0