Prosper Marketplace 10-Q 13 May 24 2024 Q1 Quarterly report Financial data

Cover Page

Cover Page - shares	3 Months Ended
	Mar. 31, 2024	May 10, 2024
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Mar. 31, 2024
Entity File Number	333-257739-01
Entity Registrant Name	PROSPER MARKETPLACE, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	73-1733867
Entity Address, Address Line One	221 Main Street
Entity Address, Address Line Two	3rd Floor
Entity Address, City or Town	San Francisco
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94105
City Area Code	415
Local Phone Number	593-5426
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		77,199,632
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0001416265
Prosper Funding LLC
Entity Information [Line Items]
Entity File Number	333-257739
Entity Registrant Name	PROSPER FUNDING LLC
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	45-4526070
Entity Address, Address Line One	221 Main Street
Entity Address, Address Line Two	3rd Floor
Entity Address, City or Town	San Francisco
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94105
City Area Code	415
Local Phone Number	593-5426
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		0
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0001542574

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands		Mar. 31, 2024	Dec. 31, 2023
Assets:
Cash and Cash Equivalents		$ 30,297	$ 34,970
Restricted Cash	[1]	108,906	120,298
Accounts Receivable		7,754	7,523
Loans Held for Sale, at Fair Value	[1]	0	161,501
Borrower Loans, at Fair Value		644,200	545,038
Property and Equipment, Net		41,735	40,889
Prepaid and Other Assets	[1]	24,154	22,273
Credit Card Derivative		45,917	36,848
Servicing Assets		12,536	12,249
Goodwill		36,368	36,368
Intangible Assets, Net		64	85
Total Assets		951,931	1,018,042
Liabilities, Convertible Preferred Stock and Stockholders' Deficit:
Accounts Payable and Accrued Liabilities		52,375	40,906
Payable to Investors		76,063	86,732
Notes, at Fair Value		316,578	321,966
Notes Issued by Securitization Trust	[1]	319,159	214,798
Warehouse Lines	[1]	0	160,207
Term Loan		75,827	75,313
Other Liabilities		34,028	35,259
Convertible Preferred Stock Warrant Liability		187,317	215,041
Total Liabilities		1,061,347	1,150,222
Commitments and Contingencies (Note 17)
Stockholders' Deficit:
Common Stock – $0.01 par value; 625,000,000 shares authorized; 78,112,888 shares issued and 77,176,953 shares outstanding, as of March 31, 2024; 77,861,329 shares issued and 76,925,394 shares outstanding, as of December 31, 2023		296	293
Additional Paid-In Capital		161,175	160,709
Less: Treasury Stock		(23,417)	(23,417)
Accumulated Deficit		(567,837)	(590,132)
Total Stockholders' Deficit		(429,783)	(452,547)
Total Liabilities, Convertible Preferred Stock and Stockholders' Deficit		951,931	1,018,042
Convertible Preferred Stock Held by Consolidated VIE
Liabilities, Convertible Preferred Stock and Stockholders' Deficit:
Convertible Preferred Stock		2,381	2,381
Consolidated Entity, Excluding Consolidated VIE
Liabilities, Convertible Preferred Stock and Stockholders' Deficit:
Convertible Preferred Stock		(322,748)	(322,748)
VIE, Primary Beneficiary
Assets:
Restricted Cash		27,528	23,546
Loans Held for Sale, at Fair Value		0	161,501
Borrower Loans, at Fair Value		321,758	220,724
Prepaid and Other Assets		0	972
Total Assets		349,286	406,743
Liabilities, Convertible Preferred Stock and Stockholders' Deficit:
Notes Issued by Securitization Trust		319,159	214,798
Warehouse Lines		0	160,207
Other Liabilities		350	550
Total Liabilities		319,509	375,555
VIE, Primary Beneficiary | Convertible Preferred Stock Held by Consolidated VIE
Liabilities, Convertible Preferred Stock and Stockholders' Deficit:
Convertible Preferred Stock		$ 2,381	$ 2,381
[1]Includes amounts in consolidated variable interest entities (“VIEs”) presented separately in the table below. The following table presents the assets and liabilities of consolidated VIEs, which are included in the Condensed Consolidated Balance Sheets above. The assets in the table below may only be used to settle obligations of consolidated VIEs and are in excess of those obligations. Additionally, the assets and liabilities in the table below include third-party assets and liabilities of consolidated VIEs only and exclude intercompany balances that eliminate in consolidation. Refer to Note 7, Securitizations , and Note 11, Debt , to the notes to the condensed consolidated financial statements for additional information. March 31, 2024 December 31, 2023 Assets of consolidated VIEs, included in total assets above: Restricted Cash $ 27,528 $ 23,546 Loans Held for Sale, at Fair Value — 161,501 Borrower Loans, at Fair Value 321,758 220,724 Prepaid and Other Assets — 972 Total assets of consolidated VIEs $ 349,286 $ 406,743 Liabilities of consolidated VIEs, included in total liabilities above: Notes Issued by Securitization Trust $ 319,159 $ 214,798 Warehouse Lines — 160,207 Other Liabilities 350 550 Total liabilities of consolidated VIEs $ 319,509 $ 375,555

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Sep. 20, 2017
Convertible preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Convertible preferred stock, authorized (in shares)	444,760,848	444,760,848	444,760,848
Convertible preferred stock, issued (in shares)	209,613,570	209,613,570
Convertible preferred stock, outstanding (in shares)	209,613,570	209,613,570
Liquidation Preference, Outstanding Shares	$ 370,456	$ 370,456
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Common stock, authorized (in shares)	625,000,000	625,000,000	625,000,000
Common stock, issued (in shares)	78,112,888	77,861,329
Common stock, outstanding (in shares)	77,176,953	76,925,394
VIE, Primary Beneficiary
Convertible preferred stock, issued (in shares)	51,247,915	51,247,915
Convertible preferred stock, outstanding (in shares)	51,247,915	51,247,915

Condensed Consolidated Balanc_3

Condensed Consolidated Balance Sheets (Unaudited) - Prosper Funding LLC - USD ($) $ in Thousands		Mar. 31, 2024	Dec. 31, 2023
Assets:
Cash and Cash Equivalents		$ 30,297	$ 34,970
Restricted Cash	[1]	108,906	120,298
Borrower Loans, at Fair Value		644,200	545,038
Servicing Assets		12,536	12,249
Total Assets		951,931	1,018,042
Liabilities and Member’s Equity:
Accounts Payable and Accrued Liabilities		52,375	40,906
Payable to Investors		76,063	86,732
Notes, at Fair Value		316,578	321,966
Other Liabilities		34,028	35,259
Total Liabilities		1,061,347	1,150,222
Member's Equity:
Retained Earnings		(567,837)	(590,132)
Total Stockholders' Deficit		(429,783)	(452,547)
Total Liabilities, Convertible Preferred Stock and Stockholders' Deficit		951,931	1,018,042
Prosper Funding LLC
Assets:
Cash and Cash Equivalents		2,220	3,351
Restricted Cash		79,662	93,688
Borrower Loans, at Fair Value		322,441	324,311
Property and Equipment, Net		10,891	11,641
Servicing Assets		13,785	13,818
Other Assets		216	176
Total Assets		434,538	448,583
Liabilities and Member’s Equity:
Accounts Payable and Accrued Liabilities		11,210	8,121
Payable to Investors		78,209	88,371
Notes, at Fair Value		316,578	321,966
Other Liabilities		3,376	3,410
Total Liabilities		409,373	421,868
Member's Equity:
Member's Equity		9,998	8,364
Retained Earnings		15,167	18,351
Total Stockholders' Deficit		25,165	26,715
Total Liabilities, Convertible Preferred Stock and Stockholders' Deficit		434,538	448,583
Prosper Funding LLC | Related Party
Assets:
Receivable from Related Party		$ 5,323	$ 1,598
[1]Includes amounts in consolidated variable interest entities (“VIEs”) presented separately in the table below. The following table presents the assets and liabilities of consolidated VIEs, which are included in the Condensed Consolidated Balance Sheets above. The assets in the table below may only be used to settle obligations of consolidated VIEs and are in excess of those obligations. Additionally, the assets and liabilities in the table below include third-party assets and liabilities of consolidated VIEs only and exclude intercompany balances that eliminate in consolidation. Refer to Note 7, Securitizations , and Note 11, Debt , to the notes to the condensed consolidated financial statements for additional information. March 31, 2024 December 31, 2023 Assets of consolidated VIEs, included in total assets above: Restricted Cash $ 27,528 $ 23,546 Loans Held for Sale, at Fair Value — 161,501 Borrower Loans, at Fair Value 321,758 220,724 Prepaid and Other Assets — 972 Total assets of consolidated VIEs $ 349,286 $ 406,743 Liabilities of consolidated VIEs, included in total liabilities above: Notes Issued by Securitization Trust $ 319,159 $ 214,798 Warehouse Lines — 160,207 Other Liabilities 350 550 Total liabilities of consolidated VIEs $ 319,509 $ 375,555

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating Revenues:
Loss on Sale of Borrower Loans	$ (10,504)	$ (1,390)
Total Operating Revenues	40,115	38,242
Interest Income (Expense):
Interest Income on Borrower Loans and Loans Held for Sale	24,236	29,019
Interest Expense on Financial Instruments	(21,025)	(21,159)
Total Interest Income, Net	3,211	7,860
Change in Fair Value of Financial Instruments	167	(5,730)
Total Net Revenue	43,493	40,372
Expenses:
Origination and Servicing	11,933	12,285
Sales and Marketing	14,043	15,504
General and Administrative	20,690	23,429
Change in Fair Value of Convertible Preferred Stock Warrants	(27,724)	(4,265)
Interest Expense on Term Loan	3,220	2,952
Other Income, Net	(990)	(513)
Total Expenses	21,172	49,392
Net Income (Loss) Before Taxes	22,321	(9,020)
Income Tax Expense	(26)	(70)
Net Income (Loss)	22,295	(9,090)
Less: Net Income Allocated to Participating Securities	(14,707)	0
Net Income (Loss) Attributable to Common Stockholders	$ 7,588	$ (9,090)
Net Income (Loss) Per Share – Basic (in dollars per share)	$ 0.10	$ (0.12)
Net Income (Loss) Per Share - Diluted (in dollars per share)	$ 0.02	$ (0.12)
Weighted Average Shares - Basic (in shares)	77,070,847	75,187,033
Weighted Average Shares – Diluted (in shares)	339,171,014	75,187,033
Transaction Fees, Net
Operating Revenues:
Revenues	$ 42,971	$ 33,285
Servicing Fees, Net
Operating Revenues:
Revenues	6,282	5,053
Other Revenues
Operating Revenues:
Revenues	$ 1,366	$ 1,294

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Operations (Unaudited) - Prosper Funding LLC - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating Revenues:
Loss on Sale of Borrower Loans	$ (10,504)	$ (1,390)
Total Operating Revenues	40,115	38,242
Interest Income (Expense):
Interest Income on Borrower Loans	24,236	29,019
Interest Expense on Notes	(21,025)	(21,159)
Total Interest Income, Net	3,211	7,860
Change in Fair Value of Financial Instruments	167	(5,730)
Expenses:
Total Expenses	21,172	49,392
Net Income (Loss)	22,295	(9,090)
Prosper Funding LLC
Operating Revenues:
Loss on Sale of Borrower Loans	(10,504)	(640)
Total Operating Revenues	14,708	16,758
Interest Income (Expense):
Interest Income on Borrower Loans	12,919	12,349
Interest Expense on Notes	(12,111)	(11,487)
Total Interest Income, Net	808	862
Change in Fair Value of Financial Instruments	(686)	(380)
Total Net Revenues	14,830	17,240
Expenses:
Administration Fee - Related Party	16,128	15,242
Servicing and Other, Net	1,886	1,741
Total Expenses	18,014	16,983
Net Income (Loss)	(3,184)	257
Administration Fee Revenue - Related Party | Prosper Funding LLC
Operating Revenues:
Revenues	18,522	10,243
Servicing Fees, Net
Operating Revenues:
Revenues	6,282	5,053
Servicing Fees, Net | Prosper Funding LLC
Operating Revenues:
Revenues	6,508	7,087
Other Revenues
Operating Revenues:
Revenues	1,366	1,294
Other Revenues | Prosper Funding LLC
Operating Revenues:
Revenues	$ 182	$ 68

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Convertible Preferred Stock and Stockholders’ Deficit (Unaudited) - USD ($) $ in Thousands	Total	Convertible Preferred Stock	Convertible Preferred Stock Held by Consolidated VIE	Common Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2022		209,613,570	51,247,915
Beginning balance at Dec. 31, 2022		$ 322,748	$ (2,381)
Ending balance (in shares) at Mar. 31, 2023		209,613,570	51,247,915
Ending balance at Mar. 31, 2023		$ 322,748	$ (2,381)
Beginning balance (in shares) at Dec. 31, 2022				79,465,150
Beginning balance at Dec. 31, 2022	$ (348,006)			$ 267	$ (23,417)	$ 158,814	$ (483,670)
Beginning balance (in shares) at Dec. 31, 2022					(5,177,235)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of vested stock options (in shares)				1,147,009
Exercise of vested stock options	27			$ 11		16
Stock-based compensation expense	415					415
Net income (loss)	(9,090)						(9,090)
Ending balance (in shares) at Mar. 31, 2023				80,612,159
Ending balance at Mar. 31, 2023	$ (356,654)			$ 278	$ (23,417)	159,245	(492,760)
Ending balance (in shares) at Mar. 31, 2023					(5,177,235)
Beginning balance (in shares) at Dec. 31, 2023	209,613,570	209,613,570	51,247,915
Beginning balance at Dec. 31, 2023		$ 322,748	$ (2,381)
Ending balance (in shares) at Mar. 31, 2024	209,613,570	209,613,570	51,247,915
Ending balance at Mar. 31, 2024		$ 322,748	$ (2,381)
Beginning balance (in shares) at Dec. 31, 2023	76,925,394			82,102,629
Beginning balance at Dec. 31, 2023	$ (452,547)			$ 293	$ (23,417)	160,709	(590,132)
Beginning balance (in shares) at Dec. 31, 2023					(5,177,235)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of vested stock options (in shares)				251,559
Exercise of vested stock options	8			$ 3		5
Stock-based compensation expense	461					461
Net income (loss)	$ 22,295						22,295
Ending balance (in shares) at Mar. 31, 2024	77,176,953			82,354,188
Ending balance at Mar. 31, 2024	$ (429,783)			$ 296	$ (23,417)	$ 161,175	$ (567,837)
Ending balance (in shares) at Mar. 31, 2024					(5,177,235)

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Members' Equity (Unaudited) - Prosper Funding LLC - USD ($) $ in Thousands	Total	Retained Earnings	Prosper Funding LLC	Prosper Funding LLC Retained Earnings	Prosper Funding LLC Member’s Equity
Beginning balance at Dec. 31, 2022	$ (348,006)	$ (483,670)	$ 26,771	$ 20,417	$ 6,354
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Contribution of Borrower Loans from Parent (Note 4)			0
Net (Loss) Income	(9,090)	(9,090)	257	257
Ending balance at Mar. 31, 2023	(356,654)	(492,760)	27,028	20,674	6,354
Beginning balance at Dec. 31, 2023	(452,547)	(590,132)	26,715	18,351	8,364
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Contribution of Borrower Loans from Parent (Note 4)			1,634	0	1,634
Net (Loss) Income	22,295	22,295	(3,184)	(3,184)
Ending balance at Mar. 31, 2024	$ (429,783)	$ (567,837)	$ 25,165	$ 15,167	$ 9,998

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024		Mar. 31, 2023
Cash flows from Operating Activities:
Net Income (Loss)	$ 22,295		$ (9,090)
Adjustments to Reconcile Net Income (Loss) to Net Cash (Used in) Provided by Operating Activities:
Change in Fair Value of Financial Instruments	(167)		5,730
Depreciation and Amortization	2,900		2,777
Amortization of Operating Lease Right-of-use Asset	819		675
Gain on Sale of Borrower Loans	(2,504)		(2,313)
Change in Fair Value of Servicing Rights	1,320		3,066
Stock-Based Compensation Expense	392		368
Change in Fair Value of Convertible Preferred Stock Warrants	(27,724)		(4,265)
Amortization of Debt Discount and Debt Issuance Costs	1,538		294
Accrual of Payment-in-kind Interest on Term Loan	381		449
Other, Net	280		(774)
Changes in Operating Assets and Liabilities:
Purchase of Loans Held for Sale at Fair Value	(487,830)		(569,802)
Proceeds from Sales and Principal Payments of Loans Held for Sale at Fair Value	540,715		507,769
Accounts Receivable	(231)		(668)
Prepaid and Other Assets	(2,725)		1,244
Credit Card Derivative	(2,729)		(1,473)
Accounts Payable and Accrued Liabilities	11,377		(4,849)
Payable to Investors	(10,669)		2,066
Other Liabilities	(633)		83
Interest payable	(2,126)		318
Net Cash Provided by (Used in) Operating Activities	44,679		(68,395)
Cash Flows from Investing Activities:
Purchase of Borrower Loans Held at Fair Value	(51,854)		(63,909)
Proceeds from Sales and Principal Payments of Borrower Loans Held at Fair Value	49,613		46,440
Purchases of Property and Equipment	(3,851)		(4,362)
Net Cash Used in Investing Activities	(6,092)		(21,831)
Cash Flows from Financing Activities:
Proceeds from Issuance of Notes Held at Fair Value	49,589		62,643
Payments of Notes Held at Fair Value	(49,806)		(46,283)
Principal Payments on Notes Issued by Securitization Trust	(31,175)		0
Proceeds from Issuance of Securitized Notes (Note 7)	136,472		0
Proceeds from Warehouse Lines	0		38,328
Principal Payments on Warehouse Lines	(28,601)		0
Extinguishment of PWIT Warehouse Line (Note 11)	(129,441)		0
Payments of Debt Issuance Costs	(1,698)		(930)
Proceeds from Exercise of Stock Options	8		26
Net Cash (Used in) Provided by Financing Activities	(54,652)		53,784
Net Decrease in Cash, Cash Equivalents and Restricted Cash	(16,065)		(36,442)
Cash, Cash Equivalents and Restricted Cash at Beginning of the Period	155,268		196,609
Cash, Cash Equivalents and Restricted Cash at End of the Period	139,203		160,167
Supplemental Disclosure of Cash Flow Information:
Cash Paid for Interest	24,854		23,064
Cash Paid for Operating Leases Included in the Measurement of Lease Liabilities	1,121		919
Non-Cash Investing Activity - Accrual for Property and Equipment, Net	1,760		397
Non-Cash Financing Activity - Accrual for Debt Issuance Costs	350		0
Reconciliation to Amounts on Consolidated Balance Sheets:
Cash and Cash Equivalents	30,297		41,264
Restricted Cash	108,906	[1]	118,903
Total Cash, Cash Equivalents and Restricted Cash	$ 139,203		$ 160,167
[1]Includes amounts in consolidated variable interest entities (“VIEs”) presented separately in the table below. The following table presents the assets and liabilities of consolidated VIEs, which are included in the Condensed Consolidated Balance Sheets above. The assets in the table below may only be used to settle obligations of consolidated VIEs and are in excess of those obligations. Additionally, the assets and liabilities in the table below include third-party assets and liabilities of consolidated VIEs only and exclude intercompany balances that eliminate in consolidation. Refer to Note 7, Securitizations , and Note 11, Debt , to the notes to the condensed consolidated financial statements for additional information. March 31, 2024 December 31, 2023 Assets of consolidated VIEs, included in total assets above: Restricted Cash $ 27,528 $ 23,546 Loans Held for Sale, at Fair Value — 161,501 Borrower Loans, at Fair Value 321,758 220,724 Prepaid and Other Assets — 972 Total assets of consolidated VIEs $ 349,286 $ 406,743 Liabilities of consolidated VIEs, included in total liabilities above: Notes Issued by Securitization Trust $ 319,159 $ 214,798 Warehouse Lines — 160,207 Other Liabilities 350 550 Total liabilities of consolidated VIEs $ 319,509 $ 375,555

Condensed Consolidated Statem_6

Condensed Consolidated Statements of Cash Flows (Unaudited) - Prosper Funding LLC - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024		Mar. 31, 2023
Cash flows from Operating Activities:
Net (Loss) Income	$ 22,295		$ (9,090)
Adjustments to Reconcile Net (Loss) Income to Net Cash Used in Operating Activities:
Change in Fair Value of Financial Instruments	(167)		5,730
Gain on Sale of Borrower Loans	(2,504)		(2,313)
Change in Fair Value of Servicing Rights	1,320		3,066
Depreciation and Amortization	2,900		2,777
Changes in Operating Assets and Liabilities:
Purchase of Loans Held for Sale at Fair Value	(487,830)		(569,802)
Proceeds from Sales and Principal Payments of Loans Held for Sale at Fair Value	540,715		507,769
Accounts Payable and Accrued Liabilities	11,377		(4,849)
Payable to Investors	(10,669)		2,066
Other Liabilities	(633)		83
Net Cash Provided by (Used in) Operating Activities	44,679		(68,395)
Cash Flows from Investing Activities:
Purchase of Borrower Loans Held at Fair Value	(51,854)		(63,909)
Proceeds from Sales and Principal Payments of Borrower Loans , at Fair Value	49,613		46,440
Purchases of Property and Equipment	(3,851)		(4,362)
Net Cash Used in Investing Activities	(6,092)		(21,831)
Cash Flows from Financing Activities:
Proceeds from Issuance of Notes Held at Fair Value	49,589		62,643
Payments of Notes , at Fair Value	49,806		46,283
Principal Payments on Notes Issued by Securitization Trust	(31,175)		0
Net Cash (Used in) Provided by Financing Activities	(54,652)		53,784
Net Decrease (Increase) in Cash, Cash Equivalents and Restricted Cash	(16,065)		(36,442)
Cash, Cash Equivalents and Restricted Cash at Beginning of the Period	155,268		196,609
Cash, Cash Equivalents and Restricted Cash at End of the Period	139,203		160,167
Supplemental Disclosure of Cash Flow Information:
Cash Paid for Interest	24,854		23,064
Non-Cash Investing Activity - Accrual for Property and Equipment, Net	1,760		397
Reconciliation to Amounts on Consolidated Balance Sheets:
Cash and Cash Equivalents	30,297		41,264
Restricted Cash	108,906	[1]	118,903
Total Cash, Cash Equivalents and Restricted Cash	139,203		160,167
Prosper Funding LLC
Cash flows from Operating Activities:
Net (Loss) Income	(3,184)		257
Adjustments to Reconcile Net (Loss) Income to Net Cash Used in Operating Activities:
Change in Fair Value of Financial Instruments	686		380
Other Non-Cash Changes in Borrower Loans, Loans Held for Sale and Notes	(113)		(105)
Gain on Sale of Borrower Loans	(2,504)		(2,939)
Change in Fair Value of Servicing Rights	2,535		2,550
Depreciation and Amortization	1,771		1,506
Changes in Operating Assets and Liabilities:
Purchase of Loans Held for Sale at Fair Value	(487,830)		(523,367)
Proceeds from Sales and Principal Payments of Loans Held for Sale at Fair Value	487,830		523,367
Other Assets	(40)		40
Accounts Payable and Accrued Liabilities	3,089		(153)
Payable to Investors	(10,162)		1,912
Net Related Party Receivable/Payable	(1,896)		5,967
Other Liabilities	(32)		60
Net Cash Provided by (Used in) Operating Activities	(9,850)		9,475
Cash Flows from Investing Activities:
Purchase of Borrower Loans Held at Fair Value	(51,854)		(63,909)
Proceeds from Sales and Principal Payments of Borrower Loans , at Fair Value	49,614		46,491
Purchases of Property and Equipment	(2,850)		(2,359)
Net Cash Used in Investing Activities	(5,090)		(19,777)
Cash Flows from Financing Activities:
Proceeds from Issuance of Notes Held at Fair Value	49,589		62,643
Payments of Notes , at Fair Value	49,806		46,283
Net Cash (Used in) Provided by Financing Activities	(217)		16,360
Net Decrease (Increase) in Cash, Cash Equivalents and Restricted Cash	(15,157)		6,058
Cash, Cash Equivalents and Restricted Cash at Beginning of the Period	97,039		97,849
Cash, Cash Equivalents and Restricted Cash at End of the Period	81,882		103,907
Supplemental Disclosure of Cash Flow Information:
Cash Paid for Interest	12,412		11,436
Non-Cash Investing Activity - Accrual for Property and Equipment, Net	292		547
Non-Cash Financing Activity - Contribution of Borrower Loans by Parent (Note 4)	1,634		0
Reconciliation to Amounts on Consolidated Balance Sheets:
Cash and Cash Equivalents	2,220		5,462
Restricted Cash	79,662		98,445
Total Cash, Cash Equivalents and Restricted Cash	$ 81,882		$ 103,907
[1]Includes amounts in consolidated variable interest entities (“VIEs”) presented separately in the table below. The following table presents the assets and liabilities of consolidated VIEs, which are included in the Condensed Consolidated Balance Sheets above. The assets in the table below may only be used to settle obligations of consolidated VIEs and are in excess of those obligations. Additionally, the assets and liabilities in the table below include third-party assets and liabilities of consolidated VIEs only and exclude intercompany balances that eliminate in consolidation. Refer to Note 7, Securitizations , and Note 11, Debt , to the notes to the condensed consolidated financial statements for additional information. March 31, 2024 December 31, 2023 Assets of consolidated VIEs, included in total assets above: Restricted Cash $ 27,528 $ 23,546 Loans Held for Sale, at Fair Value — 161,501 Borrower Loans, at Fair Value 321,758 220,724 Prepaid and Other Assets — 972 Total assets of consolidated VIEs $ 349,286 $ 406,743 Liabilities of consolidated VIEs, included in total liabilities above: Notes Issued by Securitization Trust $ 319,159 $ 214,798 Warehouse Lines — 160,207 Other Liabilities 350 550 Total liabilities of consolidated VIEs $ 319,509 $ 375,555

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2024
Entity Information [Line Items]
Basis of Presentation	Basis of Presentation Prosper Marketplace, Inc. (“PMI” or the “Company”) was incorporated in the state of Delaware on March 22, 2005. Except as the context requires otherwise, as used in these notes to the condensed consolidated financial statements of PMI, “Prosper,” “we,” “us,” and “our” refer to PMI and its wholly-owned subsidiaries, on a consolidated basis. The unaudited interim condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“US GAAP”) and disclosure requirements for interim financial information and the requirements of Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by US GAAP for complete financial statements. The unaudited interim condensed consolidated financial statements should be read in conjunction with the audited financial statements and notes thereto for the year ended December 31, 2023. The balance sheet at December 31, 2023 has been derived from the audited financial statements at that date. Management believes these unaudited interim condensed consolidated financial statements reflect all adjustments, consisting of a normal recurring nature, which are necessary for a fair presentation of the results for the interim periods presented. The results of operations for the interim periods are not necessarily indicative of the results that may be expected for the full year or any other interim period. PMI did not have any items of other comprehensive income or loss for any of the periods presented in the condensed consolidated financial statements as of and for the three months ended March 31, 2024 and 2023. The preparation of Prosper’s condensed consolidated financial statements and related disclosures in conformity with US GAAP requires management to make judgments, assumptions and estimates that affect the amounts reported in Prosper’s financial statements and accompanying notes. Management bases its estimates on historical experience and on various other factors it believes to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of certain assets and liabilities. These judgments, estimates and assumptions are inherently subjective in nature and actual results may differ from these estimates and assumptions. The accompanying interim condensed consolidated financial statements include the accounts of PMI, its wholly-owned subsidiaries and consolidated VIEs. All intercompany balances have been eliminated in consolidation. Notes Issued by Securitization Trust are notes held by certain third-party investors pursuant to Prosper’s securitization transactions, and are distinguishable from the borrower payment dependent Notes available to investors through the Company’s Note Channel.
Prosper Funding LLC
Entity Information [Line Items]
Basis of Presentation	Basis of Presentation Prosper Funding LLC (“PFL”) was formed in the state of Delaware in February 2012 as a limited liability company with Prosper Marketplace, Inc. (“PMI”) as its sole equity member. Except as the context otherwise requires, as used in these Notes to the condensed consolidated financial statements of Prosper Funding LLC, “PFL,” and the “Company” refers to Prosper Funding LLC and its wholly owned subsidiary, Prosper Depositor LLC, a Delaware limited liability company, on a consolidated basis. The unaudited interim condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“US GAAP”) and disclosure requirements for interim financial information and the requirements of Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by US GAAP for complete financial statements. The unaudited interim condensed consolidated financial statements should be read in conjunction with the audited financial statements and notes thereto for the year ended December 31, 2023. The balance sheet at December 31, 2023 has been derived from the audited financial statements at that date. Management believes these unaudited interim condensed consolidated financial statements reflect all adjustments, consisting of a normal recurring nature, which are necessary for a fair presentation of the results for the interim periods presented. The results of operations for the interim periods are not necessarily indicative of the results that may be expected for the full year or any other interim period. PFL did not have any items of other comprehensive income or loss for any of the periods presented in the condensed consolidated financial statements as of and for the three months ended March 31, 2024 and 2023. The preparation of PFL's condensed consolidated financial statements and related disclosures in conformity with US GAAP requires management to make judgments, assumptions and estimates that affect the amounts reported in its condensed consolidated financial statements and accompanying notes. Management bases its estimates on historical experience and on various other factors it believes to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of certain assets and liabilities. These judgments, estimates and assumptions are inherently subjective in nature and actual results may differ from these estimates and assumptions, and the differences could be material.

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2024
Entity Information [Line Items]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Prosper’s significant accounting policies are included in Note 2, Summary of Significant Accounting Policies, in Prosper’s Annual Report on Form 10-K for the year ended December 31, 2023. There have been no changes to these accounting policies during the first three months of 2024. Fair Value Measurements Financial instruments measured at fair value consist principally of Borrower Loans (Note 4), Loans Held for Sale (Note 4), Servicing Assets (Note 6), Credit Card Derivative (Note 5), Loan Trailing Fee Liabilities (Note 10), Debt (Note 11) and Convertible Preferred Stock Warrant Liability (Note 13). The estimated fair values of other financial instruments, including Cash and Cash Equivalents, Restricted Cash, Accounts Receivable, Accounts Payable and Accrued Liabilities, and Payable to Investors approximate their carrying values because of their short-term nature. The estimated fair values of the Term Loan and Warehouse Lines (Note 11) do not approximate their carrying values due primarily to differences in the stated and market rates associated with these instruments. Refer to Note 8, Fair Value of Assets and Liabilities, for additional fair value disclosures. Restricted Cash Restricted cash consists primarily of cash deposits, money market funds and short-term certificate of deposit accounts held as collateral as required for loan funding and servicing activities, and cash that investors or Prosper have on the marketplace that has not yet been invested in Borrower Loans or disbursed to the investor. Borrower Loans, Loans Held for Sale and Notes Borrower Loans are funded either through the Note Channel or through the Whole Loan Channel. Through the Note Channel, Prosper purchases Borrower Loans from WebBank, then issues Notes and holds the Borrower Loans until maturity. The obligation to repay a series of Notes issued through the Note Channel is dependent upon the repayment of the associated Borrower Loan. Borrower Loans funded and Notes issued through the Note Channel are carried on Prosper’s condensed consolidated balance sheets as assets and liabilities, respectively. Until March 2024, Prosper used Warehouse Lines to purchase Loans Held for Sale that could be subsequently contributed to securitization transactions or sold to investors. Loans Held for Sale were included in “Loans Held for Sale, at Fair Value” on the condensed consolidated balance sheets. In September 2023 and March 2024, in connection with the securitization transactions discussed below, the Loans Held for Sale in these Warehouse Lines were fully contributed to the securitization entities or purchased by Prosper, and the outstanding balances of the Warehouse Lines were fully paid down. See Note 11, Debt for more details on the termination of the Warehouse Lines. In September 2023 and March 2024, Prosper closed two separate securitization transactions, PMIT 2023-1 and PMIT 2024-1, respectively, with personal loans previously funded through its PWIIT Warehouse Line and PWIT Warehouse Line, respectively. These newly formed securitization entities issued notes acquired by third parties and residual certificates acquired by PMI (a majority owned affiliate of PFL, the sole sponsor of the securitizations). PMIT 2023-1 and PMIT 2024-1 are deemed consolidated VIEs, and as a result the Borrower Loans they hold are presented in “Borrower Loans, at Fair Value,” and the notes sold to third-party investors are included in “Notes Issued by Securitization Trust” on the accompanying condensed consolidated balance sheets. See Note 7, Securitizations , for additional disclosures related to these securitizations. Borrower Loans and Loans Held for Sale are purchased from WebBank. Prosper places Borrower Loans and Loans Held for Sale on non-accrual status when they are 120 days past due. When a loan is placed on non-accrual status, Prosper stops accruing interest and reverses all accrued but unpaid interest as of such date. Additionally, Prosper charges-off Borrower Loans and Loans Held for Sale when they are 120 days past due. The fair value of loans 120 or more days past due generally consists of the expected recovery from debt sales in subsequent periods. Prosper has elected the fair value option for Borrower Loans, Loans Held for Sale and Notes. Changes in the fair value of Borrower Loans funded through the Note Channel are largely offset by the changes in fair value of Notes due to the borrower payment-dependent design of the Notes. Changes in the fair value of Borrower Loans and Loans Held for Sale are recorded through Proper's earnings and Prosper collects interest on Borrower Loans and Loans Held for Sale. Changes in the fair values of Borrower Loans, Loans Held for Sale and Notes are included in “Change in Fair Value of Financial Instruments” on the accompanying condensed consolidated statements of operations. Prosper primarily uses a discounted cash flow model to estimate the fair value of Borrower Loans, Loans Held for Sale and Notes. The key assumptions used in the valuation include default rates and prepayment rates derived primarily from historical performance, and discount rates based on estimates of the rates of return that investors would require when investing in financial instruments with similar characteristics. Credit Card Derivative The Company evaluated the terms of its Credit Card program agreement (the “Credit Card Program Agreement”) with Coastal Community Bank (“Coastal”) and determined that it contained features that met the definition of derivatives under Accounting Standards Codification (“ASC”) 815, Derivatives and Hedging . These features are freestanding financial instruments (as defined under ASC 480, Distinguishing Liabilities from Equity ), and have been valued separately as derivatives. A right of offset exists between the derivatives, and they are presented net on the accompanying consolidated balance sheets. Changes in the fair value of the Credit Card Derivative, as well as settled transactions from the Credit Card portfolio, are recorded in “Change in Fair Value of Financial Instruments” on the accompanying condensed consolidated statements of operations. Refer to Note 5, Credit Card , for additional details on revenues and expenses related to the Credit Card product, and to Note 8, Fair Value of Assets and Liabilities , for additional details related to the valuation methodology for the Credit Card Derivative. Term Loan Prosper entered into a Credit Agreement, which provided for a Term Loan with a third-party financial institution in November 2022, which is more fully described in Note 11, Debt . This Term Loan is carried at amortized cost, net of discounts and issuance costs, which are subsequently amortized to Interest Expense on Term Loan over the life of the underlying agreement. Interest Expense on Term Loan is presented as a component of Expenses on the accompanying condensed consolidated statements of operations, except for any portion associated with Term Loan proceeds used to purchase Loans Held for Sale through the Company’s Warehouse Lines, which is presented in “Interest Expense on Financial Instruments” as a component of Net Interest Income on the accompanying condensed consolidated statement of operations. Leases Management determines if an arrangement is a lease at inception. Operating lease right-of-use (“ROU”) assets and operating lease liabilities are included on the Condensed Consolidated Balance Sheets in Property and Equipment, Net and in Other Liabilities, respectively. For certain leases with original terms of twelve months or less, PMI recognizes the lease expense as incurred and does not record ROU assets and lease liabilities. If a contract contains a lease, management evaluates whether it should be classified as an operating or finance lease. Operating lease ROU assets and operating lease liabilities are recognized based on the present value of the future minimum lease payments over the lease term at the commencement date. As most of PMI's leases do not provide an implicit rate, management uses an incremental borrowing rate based on the information available at commencement date in determining the present value of future payments. The operating lease ROU asset also includes any lease payments made and excludes lease incentives and initial direct costs incurred. Lease expense for minimum lease payments is recognized on a straight-line basis over the lease term. The operating lease ROU assets are evaluated for impairment utilizing the same impairment model used for Property and Equipment. Consolidation of Variable Interest Entities The determination of whether to consolidate a VIE in which we have a variable interest requires a significant amount of analysis and judgment regarding whether we are the primary beneficiary of a VIE due to our holding a controlling financial interest in the VIE. A controlling financial interest in a VIE exists if we have both the power to direct the VIE’s activities that most significantly affect the VIE’s economic performance and a potentially significant economic interest in the VIE. The determination of whether an entity is a VIE considers factors, such as (i) whether the entity’s equity investment at risk is insufficient to allow the entity to finance its activities without additional subordinated financial support and (ii) whether a holder’s equity investment at risk lacks any of the following characteristics of a controlling financial interest: the direct or indirect ability through voting rights or similar rights to make decisions about a legal entity’s activities that have a significant effect on the entity’s success, the obligation to absorb the expected losses of the entity or the right to receive the expected residual returns of the legal entity. Management regularly reviews and reconsiders its previous conclusions regarding the status of an entity as a VIE and whether we are required to consolidate or deconsolidate such VIE in the consolidated financial statements. Recent Accounting Pronouncements Accounting Standards Issued, to be Adopted by the Company in Future Periods In March 2020, the FASB issued Accounting Standards Update (“ASU”) No. 2020-04, “Reference Rate Reform (Topic 848),” which provides optional expedients and exceptions for applying GAAP on contract modifications and hedge accounting, in order to ease the financial reporting burdens of the expected market transition from LIBOR and other interbank offered rates to alternative referenced rates, such as the Secured Overnight Financing Rate. The optional guidance, which became effective on March 12, 2020, could be applied through December 31, 2022. In December 2022, the FASB issued No 2022-06 extending the sunset date of the relief provided under ASU No. 2020-04 to December 31, 2024. The Company amended its agreements and transitioned to SOFR for contracts that previously referenced LIBOR. The Company continues to evaluate potential future impacts that may result from the discontinuation of LIBOR or other reference rates as well as the accounting provided in this update on our financial condition, results of operations, and cash flows . In October 2023, the FASB issued ASU No. 2023-06, “Disclosure Improvements: Codification Amendments in Response to the Securities and Exchange Commission’s Disclosure Update and Simplification Initiative”. The amendments in this update modify the disclosure or presentation requirements of a variety of Topics in the ASC in response to the SEC’s Release No. 33-10532, “Disclosure Update and Simplification Initiative”, and align the ASC’s requirements with the SEC’s regulations. The effective date for each amendment will be the date on which the SEC's removal of that related disclosure from Regulation S-X or Regulation S-K becomes effective. However, if by June 30, 2027, the SEC has not removed the related disclosure from its regulations, the amendments will be removed from the Codification and not become effective. Early adoption is prohibited. The Company does not expect the adoption of this ASU to have a material impact on the Company’s condensed consolidated financial statements and related disclosures. In November 2023, the FASB issued ASU No. 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures”, which updates reportable segment disclosure requirements primarily through enhanced disclosures about significant segment expenses. The amendments are effective for fiscal years beginning after December 15, 2023, and for interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. The amendments should be applied retrospectively to all prior periods presented in the financial statements. The Company is currently evaluating this ASU to determine its impact on the Company’s disclosures. In December 2023, the FASB issued ASU No. 2023-09, “I ncome Taxes (Topic 740): Improvements to Income Tax Disclosures”, which enhances effective tax rate reconciliation disclosure requirements and provides clarity to the disclosures of income taxes paid, income before taxes and provision for income taxes. The amendments are effective for fiscal years beginning after December 15, 2024. Early adoption is permitted for annual financial statements that have not yet been issued or made available for issuance. The amendments in this update should be applied on a prospective basis. Retrospective application is permitted. The Company is currently evaluating this ASU to determine its impact on the Company’s disclosures. Other recent accounting pronouncements issued by the FASB did not, or are not believed by management to, have a material impact on the Company’s present or future financial statements.
Prosper Funding LLC
Entity Information [Line Items]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies PFL's significant accounting policies are included in Note 2, Summary of Significant Accounting Policies, in PFL’s Annual Report on Form 10-K for the year ended December 31, 2023. There have been no changes to these accounting policies during the first three months of 2024. Fair Value Measurements Financial instruments consist principally of Cash and Cash Equivalents, Restricted Cash, Borrower Loans, Loans Held for Sale, Accounts Receivable, Accounts Payable and Accrued Liabilities, Payable to Investors and Notes. The estimated fair values of Cash and Cash Equivalents, Restricted Cash, Accounts Receivable, Accounts Payable and Accrued Liabilities, and Payable to Investors approximate their carrying values because of their short-term nature. Refer to Note 7 for additional fair value disclosures. Restricted Cash Restricted Cash consists primarily of cash deposits, money market funds and short-term certificate of deposit accounts held as collateral as required for long term leases, loan funding and servicing activities, and cash that investors have on our marketplace that has not yet been invested in Borrower Loans or disbursed to the investor. Borrower Loans, Loans Held for Sale and Notes With respect to the Note Channel, PFL purchases Borrower Loans from WebBank, then issues Notes and holds the Borrower Loans until maturity. The obligation to repay a series of Notes funded through the Note Channel is dependent upon the repayment of the associated Borrower Loan. Borrower Loans and Notes funded through the Note Channel are carried on PFL’s condensed consolidated balance sheets as assets and liabilities, respectively. PFL places Borrower Loans and Loans Held for Sale on non-accrual status when they are 120 days past due. When a loan is placed on non-accrual status, PFL stops accruing interest and reverses all accrued but unpaid interest as of such date. Additionally, PFL charges-off Borrower Loans and Loans Held for Sale when they are 120 days past due. The fair value of loans 120 days past due generally consists of the expected recovery from debt sales in subsequent periods. Management has elected the fair value option for Borrower Loans, Loans Held for Sale, and Notes. Changes in fair value of Borrower Loans are largely offset by the changes in fair value of Notes due to the borrower payment-dependent design of the Notes. Changes in fair value of Borrower Loans, Loans Held for Sale and Notes are included in “Change in Fair Value of Financial Instruments, Net” on the condensed consolidated statements of operations. PFL primarily uses a discounted cash flow model to estimate the fair value of Borrower Loans, Loans Held for Sale and Notes. The key assumptions used in the valuation include default rates and prepayment rates derived primarily from historical performance and discount rates based on estimates of the rates of return that investors would require when investing in financial instruments with similar characteristics. Recent Accounting Pronouncements Accounting Standards Adopted In The Current Period No accounting standards were adopted in the current period for PFL. Accounting Standards Issued, To Be Adopted By PFL In Future Periods No issued and pending accounting standards were identified that are expected to have an impact on PFL.

Property and Equipment, Net

Property and Equipment, Net	3 Months Ended
	Mar. 31, 2024
Entity Information [Line Items]
Property and Equipment, Net	Property and Equipment, Net Property and Equipment consists of the following at the dates presented (in thousands): March 31, 2024 December 31, 2023 Internal-use software and website development costs $ 58,669 $ 58,423 Operating lease right-of-use assets 22,690 22,655 Computer equipment 10,489 10,466 Leasehold improvements 7,144 6,827 Office equipment and furniture 2,968 2,936 Assets not yet placed in service 12,552 9,953 Property and equipment 114,512 111,260 Less: Accumulated depreciation and amortization (72,777) (70,371) Total Property and Equipment, Net $ 41,735 $ 40,889 Depreciation and amortization expense for Property and Equipment, Net for the three months ended March 31, 2024 and 2023 was $2.9 million and $2.7 million, respectively. These charges are included in Origination and Servicing and General and Administrative expenses on the condensed consolidated statements of operations. PMI capitalized internal-use software and website development costs in the amount of $4.1 million and $3.3 million for the three months ended March 31, 2024 and 2023, respectively. Additionally, disclosures around the operating lease right-of-use assets are included in Note 16.
Prosper Funding LLC
Entity Information [Line Items]
Property and Equipment, Net	Property and Equipment, Net Property and equipment consist of the following as of the dates presented (in thousands): March 31, 2024 December 31, 2023 Internal-use software and web site development costs $ 43,642 $ 43,619 Less: accumulated depreciation and amortization (32,751) (31,978) Total property and equipment, net $ 10,891 $ 11,641 Depreciation expense for the three months ended March 31, 2024 and 2023 was $1.8 million

Borrower Loans, Loans Held for

Borrower Loans, Loans Held for Sale and Notes, at Fair Value	3 Months Ended
	Mar. 31, 2024
Entity Information [Line Items]
Borrower Loans, Loans Held for Sale and Notes, at Fair Value	Borrower Loans, Loans Held for Sale and Notes, at Fair Value The aggregate principal balances outstanding and fair values of Borrower Loans, Loans Held for Sale, and Notes as of March 31, 2024 and December 31, 2023, are presented in the following table (in thousands): Borrower Loans Loans Held for Sale Notes March 31, 2024 December 31, 2023 March 31, 2024 December 31, 2023 March 31, 2024 December 31, 2023 Aggregate principal balance and interest outstanding $ 675,349 $ 577,029 $ — $ 170,925 $ 334,139 $ 345,341 Fair value adjustments (31,149) (31,991) — (9,424) (17,561) (23,375) Fair value $ 644,200 $ 545,038 $ — $ 161,501 $ 316,578 $ 321,966 Borrower Loans As of March 31, 2024, outstanding Borrower Loans had original terms to maturity of 24, 36, 48 or 60 months, had monthly payments with fixed interest rates ranging from 5.46% to 33.00%, and had various original maturity dates through March 2029. As of December 31, 2023, outstanding Borrower Loans had original terms to maturity of 24, 36, 48 or 60 months, had monthly payments with fixed interest rates ranging from 5.46% to 33.00%, and had various original maturity dates through December 2028. As of March 31, 2024, Borrower Loans that were 90 days or more delinquent had an aggregate principal amount of $7.2 million and a fair value of $1.1 million. As of December 31, 2023, Borrower Loans that were 90 days or more delinquent had an aggregate principal amount of $7.0 million and a fair value of $1.3 million. Prosper places loans on non-accrual status when they are over 120 days past due. As of March 31, 2024 and December 31, 2023, Borrower Loans in non-accrual status had a fair value of $1.1 million and $1.0 million, respectively. Loans Held for Sale As of March 31, 2024, the outstanding balance of Loans Held for Sale was reduced to zero following the contribution of loans held in consolidated warehouse trusts to the PMIT 2023-1 and PMIT 2024-1 securitization transactions in September 2023 and March 2024, respectively, as more fully described in Note 7, Securitizations . As of December 31, 2023, outstanding Loans Held for Sale had original terms to maturity of either 24, 36, 48 or 60 months, had monthly payments with fixed interest rates ranging from 6.00% to 33.00% and had various original maturity dates through July 2028. Interest income earned on Loans Held for Sale by the Company was $4.3 million and $16.5 million for the three months ended March 31, 2024 and March 31, 2023, respectively.
Prosper Funding LLC
Entity Information [Line Items]
Borrower Loans, Loans Held for Sale and Notes, at Fair Value	Borrower Loans and Notes, at Fair Value The aggregate principal balances outstanding and fair values of Borrower Loans and Notes as of March 31, 2024 and December 31, 2023, are presented in the following table (in thousands): Borrower Loans Notes March 31, 2024 December 31, 2023 March 31, 2024 December 31, 2023 Aggregate principal balance outstanding and interest outstanding $ 338,310 $ 342,791 $ 334,139 $ 345,341 Fair value adjustments (15,869) (18,480) (17,561) (23,375) Fair value $ 322,441 $ 324,311 $ 316,578 $ 321,966 As of March 31, 2024, outstanding Borrower Loans had original terms to maturity of 24, 36, 48 or 60 months, had monthly payments with fixed interest rates ranging from 5.46% to 33.00% and had various original maturity dates through March 2029. As of December 31, 2023, outstanding Borrower Loans had original maturities of either 24, 36, 48 or 60 months, monthly payments with fixed interest rates ranging from 5.46% to 33.00%, and had various original maturity dates through December 2028. As of March 31, 2024, Borrower Loans that were 90 days or more delinquent had an aggregate principal amount of $5.2 million and a fair value of $0.8 million . As of December 31, 2023, Borrower Loans that were 90 days or more delinquent had an aggregate principal amount of $4.5 million and a fair value of $0.9 million. PFL places loans on non-accrual status when they are over 120 days past due. As of March 31, 2024 and December 31, 2023, Borrower Loans in non-accrual status had a fair value of $0.8 million and $0.8 million , respectively. On September 25, 2023, Prosper completed the PMIT 2023-1 transaction, a securitization of Borrower Loans originated through Prosper’s marketplace platform. PFL served as the sole sponsor for this securitization. Loans eligible for securitization that were funded through the PWIIT Warehouse Line were contributed to the PMIT 2023-1 securitization. Loans that were not eligible for securitization, with an aggregate outstanding principal balance of $7.7 million and a fair value of $2.0 million, were contributed to PFL, and are included in “Borrower Loans, at Fair Value” on the accompanying condensed consolidated balance sheet. The fair value of these Borrower Loans was recorded as a deemed Contribution of Borrower Loans from Parent on the condensed consolidated statement of member’s equity and as a non-cash financing activity on the condensed consolidated statement of cash flows. On March 28, 2024, Prosper completed another securitization of Borrower Loans originated through Prosper’s marketplace platform, PMIT 2024-1. PFL served as the sole sponsor for this securitization. Loans eligible for securitization that were funded through the PWIT Warehouse Line were contributed to the PMIT 2024-1 securitization. Loans that were not eligible for securitization, with an aggregate outstanding principal balance of $4.5 million and a fair value of $1.6 million, were contributed to PFL, and are included in “Borrower Loans, at Fair Value” on the accompanying condensed consolidated balance sheet. The fair value of these Borrower Loans was recorded as a deemed Contribution of Borrower Loans from Parent on the condensed consolidated statement of member’s equity and as a non-cash financing activity on the condensed consolidated statement of cash flows.

Credit Card

Credit Card	3 Months Ended
	Mar. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Credit Card	Credit Card In March 2024, the Company executed an amendment to the Credit Card Program Agreement that revised the allocation of customer accounts designated as Prosper accounts (“Prosper Allocations”) and Coastal accounts (“Coastal Allocations”) from 90% and 10%, respectively, to 95% and 5%, respectively. Additionally, the maximum outstanding Credit Card principal balance for Prosper Allocations was increased from $300 million to $350 million. These changes went into effect on April 1, 2024. For the three months ended March 31, 2024 and 2023, the Company recogniz ed $9.1 million and $6.1 million, respectively, of unrealized gains from fair value changes on the Credit Card Derivative. Changes from settled transactions underlying the Credit Card Derivative, including income from debt sales on charged off balances, were a loss of $2.7 million and a loss of $1.5 million for the three months ended March 31, 2024 and 2023, respectively. These unrealized and settled gains and losses are included in Changes in Fair Value of Financial Instruments on the accompanying condensed consolidated statements of operations. The Company records revenue from various fees generated from the Credit Card program, including interchange fees, annual fees and late fees, net of a portion of the interchange fees that must be remitted to Coastal. These fees are included in Transaction Fees, Net on the accompanying condensed consolidated statements of operations. For the three months ended March 31, 2024 and 2023, these fees totaled $5.8 million an d $3.4 million, respectively. Under the program agreement, Prosper is responsible for servicing the entire underlying Credit Card portfolio. Coastal pays the Company a 1% per annum servicing fee on the daily outstanding principal balance of receivables designated as Coastal Allocations. To the extent these servicing fees do not exceed the market servicing rate a market participant would require to service the entire Credit Card portfolio, the Company records a servicing obligation liability and measures it at fair value through the servicing period. The net balance of this servicing obligation liability is included in “Other Liabilities” on the accompanying condensed consolidated balance sheets (see Note 10, Other Liabilities ). Changes in the fair value of the servicing obligation liability are recorded in Servicing Fees, Net on the accompanying condensed consolidated statements of operations, and totaled a gain of $0.9 million and a loss of $0.9 million

Servicing Assets

Servicing Assets	3 Months Ended
	Mar. 31, 2024
Entity Information [Line Items]
Servicing Assets	Servicing Assets Prosper accounts for Servicing Assets at their estimated fair values with changes in fair values recorded in Servicing Fees, Net on the accompanying condensed consolidated statement of operations. The initial asset or liability is recognized when Prosper sells Borrower Loans to unrelated third-party buyers through the Whole Loan Channel and the servicing rights are retained. The Servicing Assets are measured at fair value throughout the servicing period. The Company recognized a loss on the sale of such Borrower Loans in the amount of $10.5 million and $1.4 million for the three months ended March 31, 2024 and 2023 , respectively, recorded in (Loss) Gain on Sale of Borrower Loans on the condensed consolidated statements of operations. As of March 31, 2024, Borrower Loans that were sold but for which Prosper retained servicing rights had a total outstanding principal balance of $3.1 billion , original terms to maturity of 24, 36, 48 or 60 months, monthly payments with fixed interest rates ranging from 5.46% to 33.00% , and various original maturity dates through March 2029 . As of December 31, 2023, Borrower Loans that were sold b ut for which Prosper retained servicing rights had a total outstanding principal balance of $3.1 billion, original terms to maturity of either 24, 36, 48 or 60 months, monthly payments with fixed interest rates ranging from 5.46% to 33.00%, and various original maturity dates through December 2028. Contractually-specified servicing fees and ancillary fees tota ling $7.4 million a nd $8.2 million for the three months ended March 31, 2024 and 2023 , respectively, are included in the condensed consolidated statements of operations in Servicing Fees, Net. Fair Value Valuation Method Prosper uses a discounted cash flow valuation methodology generally consisting of developing an estimate of future cash flows that are expected to occur over the life of a financial instrument and then discounts those cash flows at a rate of return that results in the fair value amount. Significant unobservable inputs presented in the table within Note 8 below are those that Prosper considers significant to the estimated fair values of the Level 3 Servicing Assets. The following is a description of the significant unobservable inputs provided in the table. Market Servicing Rate Prosper estimates adequate market servicing rates that would fairly compensate a substitute servicer should one be required, which includes the profit that would be demanded in the marketplace. This rate is stated as a fixed percentage of outstanding principal balance on a per annum basis. With the assistance of a valuation specialist, Prosper estimates these market servicing rates based on observable market rates for other loan types in the industry and bids from subservicing providers, adjusted for the unique loan attributes that are present in the specific loans that Prosper sells and services and information from backup service providers. Discount Rate The discount rate is a rate of return used to discount future expected cash flows to arrive at a present value, which represents the fair value of the loan servicing rights. We use a range of discount rates for the Servicing Assets based on comparable observed valuations of similar assets and publicly available disclosures related to servicing valuations, with comparability adjustments made to account for differences with Prosper’s servicing assets. Default Rate The default rate presented in Note 8 is an annualized, average estimate considering all Borrower Loan categories (i.e., risk ratings and duration), and represents an aggregate of conditional default rate curves for each credit grade or Borrower Loan category. Each point on a particular Borrower Loan category’s curve represents the percentage of principal expected to default per period based on the term and age of the underlying Borrower Loans. The assumption regarding defaults directly reduces servicing revenues because the amount of servicing revenues received is based on the amount collected each period. Prepayment Rate The prepayment rate presented in Note 8 is an annualized, average estimate considering all Borrower Loan categories (i.e., risk ratings and duration), and represents an aggregate of conditional prepayment rate curves for each credit grade or Borrower Loan category. Each point on a particular Borrower Loan category’s curve represents the percentage of principal expected to prepay per period based on the term and age of the underlying Borrower Loans. Prepayments reduce servicing revenues as they shorten the period over which we expect to collect fees on the Borrower Loans, which is used to project future servicing revenues.
Prosper Funding LLC
Entity Information [Line Items]
Servicing Assets	Servicing Assets PFL accounts for Servicing Assets at their estimated fair values with changes in fair values recorded in Servicing Fees, Net on the condensed consolidated statements of operations. The initial asset is recognized when PFL sells Borrower Loans to unrelated third-party buyers through the Whole Loa n Channel and the servicing rights are retained. PFL recognized a loss on the sale of such Borrower Loans in the amount of $10.5 million and $0.6 million for the three months ended March 31, 2024 and 2023, respectively, recorded in (Loss) Gain on Sale of Borrower Loans on the condensed consolidated statements of operations. As of March 31, 2024, Borrower Loans that were sold, but for which PFL retained servicing rights, had a total outstanding principal balance of $3.5 billion, o rigi nal ter ms of 24, 36, 48 or 60 months, monthly payments with fixed interest rates ranging fro m 5.46% to 33.00%, and various original maturity dates through March 2029. As of December 31, 2023, Borrower Loans that were sold, but fo r which PFL retained servicing rights, had a total outstanding principal balance of $3.5 billion, original terms of either 24, 36, 48 or 60 months, monthly payments with fixed interest rates ranging from 5.46% to 33.00%, and various original maturity dates through December 2028. Contractually-specified servicing fees and ancillary fees tot aled $9.4 million and $10.3 million for the three months ended March 31, 2024 and 2023, and are included in Servicing Fees, Net on the condensed consolidated statements of operations. Fair Value Valuation Method PFL uses a discounted cash flow valuation methodology generally consisting of developing an estimate of future cash flows that are expected to occur over the life of a financial instrument and then discounting those cash flows at a rate of return that results in the fair value amount. Significant unobservable inputs presented in the table within Note 7 are those that PFL considers significant to the estimated fair values of the Level 3 Servicing Assets. The following is a description of the significant unobservable inputs provided in the table. Market Servicing Rate PFL estimates adequate market servicing rates that would fairly compensate a substitute servicer should one be required, which includes the profit that would be demanded in the marketplace. This rate is stated as a fixed percentage of outstanding principal balance on a per annum basis. With the assistance of a valuation specialist, PFL estimates these market servicing rates based on observable market rates for other loan types in the industry and bids from sub-servicing providers, adjusted for the unique loan attributes that are present in the specific loans that PFL sells and services and information from backup service providers. Discount Rate The discount rate is a rate of return used to discount future expected cash flows to arrive at a present value, which represents the fair value of the loan servicing rights. Management used a range of discount rates for the Servicing Assets based on comparable observed valuations of similar assets and publicly available disclosures related to servicing valuations, with comparability adjustments made to account for differences with PFL’s Servicing Assets. Default Rate The default rate presented in Note 7 is an annualized, average estimate considering all Borrower Loan categories (i.e., risk ratings and duration), and represents an aggregate of conditional default rate curves for each credit grade or Borrower Loan category. Each point on a particular Borrower Loan category’s curve represents the percentage of principal expected to default per period based on the term and age of the underlying Borrower Loans. The assumption regarding defaults directly reduces servicing revenues because the amount of servicing revenues received is based on the amount collected each period. Prepayment Rate The prepayment rate presented in Note 7 is an annualized, average estimate considering all Borrower Loan categories (i.e., risk ratings and duration), and represents an aggregate of conditional prepayment rate curves for each credit grade or Borrower Loan category. Each point on a particular Borrower Loan category’s curve represents the percentage of principal expected to prepay per period based on the term and age of the underlying Borrower Loans. Prepayments reduce servicing revenues as they shorten the period over which PFL expects to collect fees on the Borrower Loans, which is used to project future servicing revenues.

Securitizations

Securitizations	3 Months Ended
	Mar. 31, 2024
Transfers and Servicing [Abstract]
Securitizations	Securitizations Prosper served as the sole sponsor of two securitizations of unsecured personal whole loans facilitated through the Company’s marketplace that were previously held in consolidated warehouse trusts: PMIT 2023-1 in September 2023 and PMIT 2024-1 in March 2024, respectively. These transactions benefit the Company by reducing the financing costs associated with the underlying Borrower Loans. Both securitizations issued senior notes and residual certificates to finance the purchase of Borrower Loans. The notes were sold to third-party investors and a majority-owned affiliate of the sole sponsor of the securitizations, PFL, retained the residual certificates. In addition to the residual certificates, Prosper’s continued involvement includes loan servicing responsibilities over the life of the underlying loans. PMIT 2023-1 and PMIT 2024-1 (together, the “PMITs”) are deemed VIEs, and the Company consolidates them as the primary beneficiary. Through Prosper’s role as the servicer, it has the power to direct the activities that most significantly affect the PMITs’ economic performance. Additionally, because the Company holds the residual certificates, it has a variable interest that could potentially be significant to the PMITs. In evaluating whether Prosper is the primary beneficiary, management considers both qualitative and quantitative factors regarding the nature, size and form of the Company’s involvement with the PMITs. Management assesses whether Prosper is the primary beneficiary of the PMITs on an on-going basis. For the PMITs, the creditors have no recourse to the general credit of Prosper and the liabilities of the PMITs can only be settled by their respective assets. Additionally, the assets of the PMITs can be used only to settle obligations of the PMITs. Because Prosper consolidates the PMITs’ securitization trusts, the Borrower Loans held in those trusts are included in “Borrower Loans, at Fair Value,” and the notes sold to third-party investors are presented in “Notes Issued by Securitization Trust” on the condensed consolidated balance sheets. Because Prosper holds 100% of the residual certificates issued by the PMITs, they eliminate through consolidation and are thus not presented on the condensed consolidated balance sheets. PMIT 2023-1 In September 2023, Prosper closed the PMIT 2023-1 securitization. Based on the terms of the underlying agreements, the PWIIT Warehouse Line (see Note 11, Debt ) agreed to contribute Borrower Loans with an aggregate outstanding principal balance of $275.9 million as of the established cutoff date of August 31, 2023, to the PMIT 2023-1 securitization. On September 25, 2023, these Borrower Loans, with an updated aggregate outstanding principal balance of $266.1 million, were contributed to the PMIT 2023-1 securitization. The notes under PMIT 2023-1 were issued in five classes: Class A in the amount of $165.5 million, Class B in the amount of $25.4 million, Class C in the amount of $25.1 million, Class D in the amount of $22.3 million and Class E in the amount of $13.1 million (collectively, the “2023-1 Notes”). The Class A, Class B, Class C, Class D and Class E notes bear interest at fixed rates of 7.06%, 7.48%, 8.29%, 11.24% and 15.49%, respectively. Principal and interest payments began in October 2023 and are payable monthly. The 2023-1 Notes are recorded at amortized cost, net of original issue discounts totaling approximately $0.8 million. These discounts, along with debt issuance costs incurred of $2.7 million, are deferred and amortized into interest expense over the contractual lives of the 2023-1 Notes using the effective interest method. As of March 31, 2024, the outstanding principal and accrued interest of the 2023-1 Notes was $186.2 million, secured by an aggregate outstanding principal balance of $196.5 million of borrower loans, and approximately $13.5 million in cash collections held in collateral and reserve accounts included in “Restricted Cash” on the condensed consolidated balance sheets. PMIT 2024-1 In March 2024, Prosper closed the PMIT 2024-1 securitization. Based on the terms of the underlying agreements, the PWIT Warehouse L ine (see Note 11, Debt ) agreed to contribute Borrower Loans with an aggregate outstanding principal balance of $148.9 million as of the established cutoff date of February 14, 2024, to th e PMIT 2024-1 securitization. On March 28, 2024, these Borrower Loans, with an updated aggregate outstanding principal balance of $138.0 million, were contributed to the PMIT 2024-1 securitization. The notes under PMIT 2024-1 were issued in four classes: Class A in the amount of $105.2 million, Class B in the amount of $10.8 million, Class C in the amount of $10.3 million and Class D in the amount of $10.2 million (collectively, the “2024-1 Notes”). The Class A, Class B, Class C and Class D notes bear interest at fixed rates of 6.12%, 6.13%, 6.96%, 10.98%, respectively. The 2024-1 Notes are recorded at amortized cost, net of debt issuance costs incurred of $1.5 million. These debt issuance costs are deferred and amortized into interest expense over the contractual lives of the 2024-1 Notes using the effective interest method. As of March 31, 2024,

Fair Value of Assets and Liabil

Fair Value of Assets and Liabilities	3 Months Ended
	Mar. 31, 2024
Entity Information [Line Items]
Fair Value of Assets and Liabilities	Fair Value of Assets and Liabilities Prosper measures the fair value of assets and liabilities in accordance with its fair value hierarchy which prioritizes information used to measure fair value and the effect of fair value measurements on earnings and provides for enhanced disclosures determined by the level within the hierarchy of information used in the valuation. The Company applies this framework whenever other standards require (or permit) assets or liabilities to be measured at fair value. Assets and liabilities carried at fair value on the balance sheets are classified among three levels based on the observability of the inputs used to determine fair value: Level 1 — The valuation is based on quoted prices in active markets for identical instruments. Level 2 — The valuation is based on observable inputs such as quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation methodologies for which all significant assumptions are observable in the market. Level 3 — The valuation is based on unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the instrument. Level 3 valuations are typically performed using pricing models, discounted cash flow methodologies, or similar methodologies, which incorporate management’s own estimates of assumptions that market participants would use in pricing the instrument or valuations that require significant management judgment or estimation. Fair values of assets or liabilities are determined based on the fair value hierarchy, which requires an entity to maximize the use of quoted prices and observable inputs and to minimize the use of unobservable inputs when measuring fair value. Various valuation methodologies are utilized, depending on the nature of the financial instrument, including the use of market prices for identical or similar instruments, or discounted cash flow models. When possible, active and observable market data for identical or similar financial instruments are utilized. Alternatively, fair value is determined using assumptions that management believes a market participant would use in pricing the asset or liability. Financial Instruments Recorded at Fair Value The fair value of the Borrower Loans, Loans Held for Sale, Notes, Servicing Assets and Liabilities and loan trailing fee liability are estimated using discounted cash flow methodologies based upon a set of valuation assumptions. The primary assumptions used in the discounted cash flow model include default and prepayment rates primarily derived from historical performance and discount rates applied to each credit grade based on the perceived credit risk of each credit grade. The fair value of the Credit Card Derivative is also estimated using a discounted cash flow model using certain assumptions. The key assumptions used in the valuation include default and prepayment rates derived primarily from historical performance and relevant market data, adjusted as necessary based on the perceived credit risk of the underlying portfolio. In addition, discount rates based on estimates of the rates of return that investors would require when investing in similar credit card portfolios are applied to the individual freestanding derivatives. The Convertible Preferred Stock Warrant Liability is valued using a Black-Scholes option pricing model. Refer to Note 13 for further details. The following tables present the fair value hierarchy for assets and liabilities measured at fair value (in thousands): March 31, 2024 Level 1 Inputs Level 2 Inputs Level 3 Inputs Total Assets: Borrower Loans, at Fair Value — — 644,200 644,200 Servicing Assets — — 12,536 12,536 Credit Card Derivative (Note 5) — — 45,917 45,917 Total Assets $ — $ — $ 702,653 $ 702,653 Liabilities: Notes, at Fair Value $ — $ — $ 316,578 $ 316,578 Convertible Preferred Stock Warrant Liability — — 187,317 187,317 Loan Trailing Fee Liability (Note 10) — — 2,938 2,938 Credit Card servicing obligation liability (Note 5) — — 8,836 8,836 Total Liabilities $ — $ — $ 515,669 $ 515,669 December 31, 2023 Level 1 Inputs Level 2 Inputs Level 3 Inputs Total Assets: Loans Held for Sale at Fair Value $ — $ — $ 161,501 $ 161,501 Borrower Loans, at Fair Value — — 545,038 545,038 SOFR rate swaption (Note 11) — 90 — 90 Servicing Assets — — 12,249 12,249 Credit Card Derivative (Note 5) $ — $ — 36,848 36,848 Total Assets $ — $ 90 $ 755,636 $ 755,726 Liabilities: Notes, at Fair Value $ — $ — $ 321,966 $ 321,966 Convertible Preferred Stock Warrant Liability — — 215,041 215,041 Loan Trailing Fee Liability (Note 10) — — 2,942 2,942 Credit Card servicing obligation liability (Note 5) $ — $ — 9,732 9,732 Total Liabilities $ — $ — $ 549,681 $ 549,681 As PMI’s Borrower Loans, Loans Held for Sale, Notes, Convertible Preferred Stock Warrant Liability, Servicing Assets and Liability, Credit Card Derivative, Credit Card servicing obligation liability and loan trailing fee liability do not trade in an active market with readily observable prices, the Company uses significant unobservable inputs to measure the fair value of these assets and liabilities. Financial instruments are categorized in the Level 3 valuation hierarchy based on the significance of unobservable factors in the overall fair value measurement. These fair value estimates may also include observable, actively quoted components derived from external sources. As a result, gains and losses for assets and liabilities within the Level 3 category may include changes in fair value that were attributable to both observable and unobservable inputs. Prosper did not transfer any assets or liabilities in or out of Level 3 for the three months ended March 31, 2024 and 2023 . Significant Unobservable Inputs The following tables present quantitative information about the ranges of significant unobservable inputs used for the Company’s Level 3 fair value measurements at March 31, 2024 and December 31, 2023: Range Borrower Loans, Loans Held for Sale and Notes: March 31, 2024 December 31, 2023 Discount rate 5.4% - 11.1% 5.4% - 8.1% Default rate 2.9% - 24.3% 3.2% - 23.6% Range Servicing Assets: March 31, 2024 December 31, 2023 Discount rate 15.0% - 25.0% 15.0% - 25.0% Default rate 2.5% - 24.4% 2.8% - 23.6% Prepayment rate 6.2% - 30.5% 6.1% - 30.6% Market servicing rate (1) (2) 0.633% - 0.842% 0.633% - 0.842% (1) Servicing assets associated with loans enrolled in a relief program offered by the Company as of March 31, 2024 and December 31, 2023 were measured using a market servicing rate assumptio n of 84.2 basis points. This rate was estimated using a multiplier consistent with observable market rates for other loan types, applied to the base market servicing rate assumption. (2) Excludes collection fees that would be passed on to a hypothetical third-party servicer. As of March 31, 2024 and December 31, 2023, the market rate for collection fees and non-sufficient fund fees was assumed to be 6 basis points and 5 basis points, respectively, for a total market servicing rate range of 69.3 - 90.2 basis points and 68.3 - 89.2 basis points, respectively. Range Loan Trailing Fee Liability: March 31, 2024 December 31, 2023 Discount rate 15.0% - 25.0% 15.0% - 25.0% Default rate 2.5% - 24.4% 2.8% - 23.6% Prepayment rate 6.2% - 30.5% 6.1% - 30.6% Ranges of inputs are not applied to the Credit Card Derivative and Credit Card servicing obligation liability, as they are valued at the portfolio level. Refer below for a summary of the significant unobservable inputs associated with those Level 3 fair value measurements. At March 31, 2024 and December 31, 2023, the discounted cash flow methodology used to estimate the Notes fair values used the same projected cash flows as the related Borrower Loans. Changes in Level 3 Fair Value Assets and Liabilities on a Recurring Basis The following tables present additional information about Level 3 Borrower Loans, Loans Held for Sale and Notes measured at fair value on a recurring basis (in thousands): Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Assets Liabilities Borrower Loans Loans Held For Sale Notes Total Balance at January 1, 2024 $ 545,038 $ 161,501 $ (321,966) $ 384,573 Purchase of Borrower Loans/Issuance of Notes 51,854 487,830 (49,589) 490,095 Principal repayments (77,762) (22,554) 49,806 (50,510) Borrower Loans sold to third parties (1,490) (488,522) — (490,012) Other changes (310) (303) 300 (313) Change in fair value (8,819) (2,263) 4,871 (6,211) Transfer of Loans Held for Sale to Borrower Loans upon PMIT 2024-1 Transaction, at Fair Value 135,689 (135,689) — — Balance at March 31, 2024 $ 644,200 $ — $ (316,578) $ 327,622 Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Assets Liabilities Borrower Loans Loans Held for Sale Notes Total Balance at January 1, 2023 $ 320,642 $ 499,765 $ (318,704) $ 501,703 Purchase of Borrower Loans/Issuance of Notes 63,909 569,802 (62,643) 571,068 Principal repayments (45,487) (63,501) 46,283 (62,705) Borrower Loans sold to third parties (953) (444,268) — (445,221) Other changes 105 762 (51) 816 Change in fair value (7,809) (9,465) 7,429 (9,845) Balance at March 31, 2023 $ 330,407 $ 553,095 $ (327,686) $ 555,816 The following tables present additional information about Level 3 Servicing Assets measured at fair value on a recurring basis for the three month periods ending March 31, 2024 and 2023 (in thousands): Servicing Assets Balance at January 1, 2024 $ 12,249 Additions 2,504 Less: Changes in fair value (2,217) Balance at March 31, 2024 $ 12,536 Servicing Assets Balance at January 1, 2023 $ 12,562 Additions 2,313 Less: Changes in fair value (2,159) Balance at March 31, 2023 $ 12,716 The following tables present additional information about the Level 3 Credit Card derivative measured at fair value on a recurring basis for the three month periods ending March 31, 2024 and 2023 (in thousands): Credit Card Derivative Balance at January 1, 2024 $ 36,848 Change in fair value 9,069 Balance at March 31, 2024 $ 45,917 Credit Card Derivative Balance at January 1, 2023 $ 10,782 Change in fair value 6,101 Balance at March 31, 2023 $ 16,883 The following tables present additional information ab out the Level 3 Credit Card servicing obligation liability (a component of “Other Liabilities” on the consolidated balance sheets) measured at fair value on a recurring basis for the three month periods ending March 31, 2024 and 2023 (in thousands): Credit Card Servicing Obligation Liability Fair Value at January 1, 2024 $ 9,732 Change in fair value (896) Balance at March 31, 2024 $ 8,836 Credit Card Servicing Obligation Liability Fair Value at January 1, 2023 $ 3,720 Change in fair value 906 Balance at March 31, 2023 $ 4,626 The following tables present additional information about the Level 3 Convertible Preferred Stock Warrant Liability measured at fair value on a recurring basis for the three month periods ending March 31, 2024 and 2023 (in thousands): Convertible Preferred Stock Warrant Liability Balance as of January 1, 2024 $ 215,041 Change in fair value (27,724) Balance as of March 31, 2024 $ 187,317 Convertible Preferred Stock Warrant Liability Balance as of January 1, 2023 $ 166,346 Change in fair value (4,265) Balance as of March 31, 2023 $ 162,081 Loan Trailing Fee The fair value of the Loan Trailing Fee represents the present value of the expected monthly Loan Trailing Fee payments, which takes into consideration certain assumptions related to expected prepayment rates and default rates using a discounted cash flow model. The assumptions used are the same as those used for the valuation of Servicing Assets, as described below. The following tables present additional information about the Level 3 Loan Trailing Fee Liability measured at fair value on a recurring basis for the three month periods ending March 31, 2024 and 2023 (in thousands): Loan Trailing Fee Liability Balance at January 1, 2024 $ 2,942 Issuances 488 Cash Payment of Loan Trailing Fee (660) Change in Fair Value 168 Balance at March 31, 2024 $ 2,938 Loan Trailing Fee Liability Balance at January 1, 2023 $ 3,290 Issuances 589 Cash Payment of Loan Trailing Fee (708) Change in Fair Value 137 Balance at March 31, 2023 $ 3,308 Significant Recurring Level 3 Fair Value Input Sensitivity Key economic assumptions and the sensitivity of the fair value to immediate changes in those assumptions at March 31, 2024 and December 31, 2023 for Borrower Loans and Loans Held for Sale are presented in the following table (in thousands, except percentages). Borrower Loans and Loans Held for Sale March 31, 2024 December 31, 2023 Fair value, using the following assumptions: $ 644,200 $ 706,539 Weighted-average discount rate 7.59 % 6.88 % Weighted-average default rate 11.41 % 12.44 % Fair value resulting from: 100 basis point increase in discount rate $ 638,091 $ 699,770 200 basis point increase in discount rate $ 632,130 $ 693,167 Fair value resulting from: 100 basis point decrease in discount rate $ 650,462 $ 713,481 200 basis point decrease in discount rate $ 656,884 $ 720,601 Fair value resulting from: Applying a 1.1 multiplier to default rate $ 636,336 $ 696,510 Applying a 1.2 multiplier to default rate $ 628,517 $ 686,586 Fair value resulting from: Applying a 0.9 multiplier to default rate $ 652,106 $ 716,671 Applying a 0.8 multiplier to default rate $ 660,058 $ 726,910 Key economic assumptions and the sensitivity of the fair value to immediate changes in those assumptions at March 31, 2024 and December 31, 2023 for Notes are presented in the following table (in thousands, except percentages). Notes March 31, 2024 December 31, 2023 Fair value, using the following assumptions: $ 316,578 $ 321,966 Weighted-average discount rate 7.31 % 6.55 % Weighted-average default rate 13.03 % 14.21 % Fair value resulting from: 100 basis point increase in discount rate $ 313,572 $ 318,877 200 basis point increase in discount rate $ 310,638 $ 315,863 Fair value resulting from: 100 basis point decrease in discount rate $ 319,660 $ 325,134 200 basis point decrease in discount rate $ 322,820 $ 328,384 Fair value resulting from: Applying a 1.1 multiplier to default rate $ 312,678 $ 317,359 Applying a 1.2 multiplier to default rate $ 308,800 $ 312,800 Fair value resulting from: Applying a 0.9 multiplier to default rate $ 320,499 $ 326,621 Applying a 0.8 multiplier to default rate $ 324,443 $ 331,325 Key economic assumptions and the sensitivity of the fair value to immediate changes in those assumptions at March 31, 2024 and December 31, 2023 for Servicing Assets is presented in the following table (in thousands, except percentages). Servicing Assets March 31, 2024 December 31, 2023 Fair value, using the following assumptions $ 12,536 $ 12,249 Weighted-average market servicing rate 0.65 % 0.65 % Weighted-average prepayment rate 19.41 % 19.55 % Weighted-average default rate 13.93 % 15.25 % Fair value resulting from: Market servicing rate increase of 0.025% $ 11,737 $ 11,475 Market servicing rate decrease of 0.025% $ 13,335 $ 13,023 Fair value resulting from: Applying a 1.1 multiplier to prepayment rate $ 12,250 $ 11,969 Applying a 0.9 multiplier to prepayment rate $ 12,827 $ 12,533 Fair value resulting from: Applying a 1.1 multiplier to default rate $ 12,280 $ 11,998 Applying a 0.9 multiplier to default rate $ 12,794 $ 12,503 Key economic assumptions and the sensitivity of the fair value to immediate changes in those assumptions at March 31, 2024 and December 31, 2023 for the Credit Card Derivative is presented in the following table (in thousands, except percentages). Credit Card Derivative March 31, 2024 December 31, 2023 Fair value, based on the following notional amount and rate assumptions: $ 45,917 $ 36,848 Prosper Credit Card portfolio 315,324 286,284 Discount rate on Prosper Allocations 23.53 % 23.19 % Discount rate on Coastal Program Fee (1) 23.53 % 7.41 % Prepayment rate applied to Credit Card portfolio 8.64 % 8.14 % Default rate applied to Credit Card portfolio 15.26 % 14.36 % Fair value resulting from: 100 basis point increase in both discount rates $ 45,306 $ 36,452 200 basis point increase in both discount rates $ 44,712 $ 36,065 Fair value resulting from: 100 basis point decrease in both discount rates $ 46,547 $ 37,253 200 basis point decrease in both discount rates $ 47,195 $ 37,668 Fair value resulting from: Applying a 1.1 multiplier to prepayment rate $ 45,244 $ 36,374 Applying a 0.9 multiplier to prepayment rate $ 46,600 $ 37,328 Fair value resulting from: Applying a 1.1 multiplier to default rate $ 36,645 $ 29,659 Applying a 0.9 multiplier to default rate $ 55,499 $ 44,256 (1) Refer to Change in Estimate section below. Key economic assumptions and the sensitivity of the fair value to immediate changes in those assumptions at March 31, 2024 and December 31, 2023 for Credit Card servicing obligation liability is presented in the following table (in thousands, except percentages). Credit Card servicing obligation liability: March 31, 2024 December 31, 2023 Fair value, using the following assumptions: $ 8,836 $ 9,732 Discount rate on Credit Card portfolio servicing obligation (1) 23.53 % 7.41 % Prepayment rate applied to Credit Card portfolio 8.64 % 8.14 % Default rate applied to Credit Card portfolio 15.26 % 14.36 % Market servicing rate 2.00 % 2.00 % Fair value resulting from: Market servicing rate increase of 0.10% $ 9,294 $ 10,253 Market servicing rate decrease of 0.10% $ 8,377 $ 9,213 Fair value resulting from: Applying a 1.1 multiplier to prepayment rate $ 8,733 $ 9,609 Applying a 0.9 multiplier to prepayment rate $ 8,939 $ 9,858 Fair value resulting from: Applying a 1.1 multiplier to default rate $ 8,628 $ 9,487 Applying a 0.9 multiplier to default rate $ 9,047 $ 9,984 (1) Refer to Change in Estimate section below. These sensitivities are hypothetical and should be evaluated with care. The effect on fair value of a variation in assumptions generally cannot be determined because the relationship of the change in assumptions to the fair value may not be linear. Additionally, the impact of a variation in a particular assumption on the fair value is calculated while holding other assumptions constant. In reality, changes in one factor may lead to changes in other factors, which could impact the above hypothetical effects. Change in Estimate Effective March 31, 2024, the Company applied a single discount rate to all of the projected cash flows that comprise the Credit Card Derivative and Credit Card servicing obligation liability, in order to better align with how PMI believes a market participant would estimate the fair value of those cash flows. This single discount rate reflects the expected market rate of return from an investment in residual cash flows derived from a credit card portfolio. Previously, separate discount rates were applied to different cash flows reflecting assumptions around counterparty credit risk. The effect of this change in estimate increased the Credit Card Derivative by $7.3 million and reduced the Credit Card servicing obligation by $1.9 million as of March 31, 2024. Accordingly, it increased Total Net Revenue and Net Income by $9.2 million for the three months ended March 31, 2024. Assets and Liabilities Not Recorded at Fair Value The following table presents the fair value hierarchy for assets, and liabilities not recorded at fair value (in thousands): March 31, 2024 Carrying Amount Level 1 Inputs Level 2 Inputs Level 3 Inputs Balance at Fair Value Assets: Cash and Cash Equivalents $ 30,297 $ 30,297 $ — $ — $ 30,297 Restricted Cash - Cash and Cash Equivalents 105,878 105,878 — — 105,878 Restricted Cash - Certificates of Deposit 3,028 — 3,028 — 3,028 Accounts Receivable 7,754 — 7,754 — 7,754 Total Assets $ 146,957 $ 136,175 $ 10,782 $ — $ 146,957 Liabilities: Accounts Payable and Accrued Liabilities $ 52,375 $ — $ 52,375 $ — $ 52,375 Payable to Investors 76,063 — 76,063 — 76,063 Notes Issued by Securitization Trust 319,159 — 320,358 — 320,358 Term Loan (Note 11) 75,827 — 78,259 — 78,259 Total Liabilities $ 523,424 $ — $ 527,055 $ — $ 527,055 December 31, 2023 Carrying Amount Level 1 Inputs Level 2 Inputs Level 3 Inputs Balance at Fair Value Assets: Cash and Cash Equivalents $ 34,970 $ 34,970 $ — $ — $ 34,970 Restricted Cash - Cash and Cash Equivalents 117,270 117,270 — — 117,270 Restricted Cash - Certificates of Deposit 3,028 — 3,028 — 3,028 Accounts Receivable 7,523 — 7,523 — 7,523 Total Assets $ 162,791 $ 152,240 $ 10,551 $ — $ 162,791 Liabilities: Accounts Payable and Accrued Liabilities $ 40,906 $ — $ 40,906 $ — $ 40,906 Payable to Investors 86,732 — 86,732 — 86,732 Notes Issued by Securitization Trust 214,798 — 208,005 — 208,005 Warehouse Lines 160,207 — 157,972 — 157,972 Term Loan (Note 11) 75,313 — 77,837 — 77,837 Total Liabilities $ 577,956 $ — $ 571,452 $ — $ 571,452 The estimated fair values of Cash and Cash Equivalents, Restricted Cash, Accounts Receivable, Accounts Payable and Accrued Liabilities and Payable to Investors approximate their carrying values because of their short-term nature.
Prosper Funding LLC
Entity Information [Line Items]
Fair Value of Assets and Liabilities	Fair Value of Assets and Liabilities PFL has elected to record certain financial instruments at fair value on the balance sheet. PFL classifies Borrower Loans, Loans Held for Sale and Notes as financial instruments and assesses their fair value each on a quarterly basis for financial statement presentation purposes. Gains and losses on these financial instruments are shown separately on the condensed consolidated statements of operations. As of March 31, 2024 and December 31, 2023, the discounted cash flow methodology used to estimate the Notes fair values used the same projected cash flows as the related Borrower Loans. As demonstrated in the table below, the fair value adjustments for Borrower Loans were largely offset by the fair value adjustments of the Notes due to the borrower payment dependent design of the Notes and because the principal balances of the Borrower Loans approximated the principal balances of the Notes. Assets and liabilities carried at fair value on the balance sheets are classified among three levels based on the observability of the inputs used to determine fair value: Level 1 — The valuation is based on quoted prices in active markets for identical instruments. Level 2 — The valuation is based on observable inputs such as quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation methodologies for which all significant assumptions are observable in the market. Level 3 — The valuation is based on unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the instrument. Level 3 valuations are typically performed using pricing models, discounted cash flow methodologies, or similar methodologies, which incorporate management’s own estimates of assumptions that market participants would use in pricing the instrument or valuations that require significant management judgment or estimation. Fair values of assets or liabilities are determined based on the fair value hierarchy, which requires an entity to maximize the use of quoted prices and observable inputs and to minimize the use of unobservable inputs when measuring fair value. Various valuation methodologies are utilized, depending on the nature of the financial instrument, including the use of market prices for identical or similar instruments, or discounted cash flow models. When possible, active and observable market data for identical or similar financial instruments are utilized. Alternatively, fair value is determined using assumptions that management believes a market participant would use in pricing the asset or liability. Financial Instruments Recorded at Fair Value The fair value of the Borrower Loans and Notes are estimated using discounted cash flow methodologies based upon a set of valuation assumptions. The primary cash flow assumptions used to value such Borrower Loans and Notes include default and prepayment rates derived primarily from historical performance and discount rates that reflect estimates of the rates of return that investors would require when investing in financial instruments with similar characteristics. The following tables present the fair value hierarchy for assets and liabilities measured at fair value (in thousands): March 31, 2024 Level 1 Inputs Level 2 Inputs Level 3 Inputs Total Assets: Borrower Loans, at Fair Value $ — $ — $ 322,441 $ 322,441 Servicing Assets — — 13,785 13,785 Total Assets $ — $ — $ 336,226 $ 336,226 Liabilities: Notes, at Fair Value $ — $ — $ 316,578 $ 316,578 Loan Trailing Fee Liability — — 2,938 2,938 Total Liabilities $ — $ — $ 319,516 $ 319,516 December 31, 2023 Level 1 Inputs Level 2 Inputs Level 3 Inputs Total Assets: Borrower Loans, at Fair Value $ — $ — $ 324,311 $ 324,311 Servicing Assets — — 13,818 13,818 Total Assets $ — $ — $ 338,129 $ 338,129 Liabilities: Notes, at Fair Value $ — $ — $ 321,966 $ 321,966 Loan Trailing Fee Liability — — 2,942 2,942 Total Liabilities $ — $ — $ 324,908 $ 324,908 As PFL’s Borrower Loans, Notes, Servicing Assets and loan trailing fee liability do not trade in an active market with readily observable prices, PFL uses significant unobservable inputs to measure the fair value of these assets and liabilities. Financial instruments are categorized in the Level 3 valuation hierarchy based on the significance of unobservable factors in the overall fair value measurement. These fair value estimates may also include observable, actively quoted components derived from external sources. As a result, the realized and unrealized gains and losses for assets and liabilities within the Level 3 category may include changes in fair value that were attributable to both observable and unobservable inputs. PFL did not transfer any assets or liabilities in or out of Level 3 for the three months ended March 31, 2024 or March 31, 2023. Significant Unobservable Inputs The following tables present quantitative information about the significant unobservable inputs used for PFL’s Level 3 fair value measurements at the dates presented: Range Borrower Loans and Notes March 31, 2024 December 31, 2023 Discount rate 5.5% - 8.9% 5.5% - 8% Default rate 2.9% - 24.0% 3.2% - 23.6% Range Servicing Assets March 31, 2024 December 31, 2023 Discount rate 15.0% - 25.0% 15.0% - 25.0% Default rate 2.5% - 24.4% 2.8% - 23.6% Prepayment rate 6.2% - 31.7% 6.1% - 30.6% Market servicing rate (1) (2) 0.633% - 0.842% 0.633% - 0.842% (1) Servicing assets associated with loa ns enrolled in a relief program offered by the Company as of March 31, 2024 and December 31, 2023 were measured using a market servicing rate assumption of 84.2 basis points. This rate was estimated using a multiplier consistent with observable market rates for other loan types, applied to the base market servicing rate assumption . (2 ) Excludes collection fees that would be passed on to a hypothetical third-party servicer. As of March 31, 2024 and December 31, 2023, the market rate for collection fees and non-sufficient fund fees was assumed to be 6 basis points and 5 basis points, respectively, for a total market servicing rate range of 69.3 - 90.2 basis points and a total market servicing rate of 68.3 - 89.2 basis points, respectively. Range Loan Trailing Fee Liability March 31, 2024 December 31, 2023 Discount rate 15.0% - 25.0% 15.0% - 25.0% Default rate 2.5% - 24.4% 2.8% - 23.6% Prepayment rate 6.2% - 31.7% 6.1% - 30.6% Changes in Level 3 Fair Value Assets and Liabilities on a Recurring Basis The following tables present additional information about Level 3 Borrower Loans, Loans Held for Sale and Notes measured at fair value on a recurring basis (in thousands): Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Assets Liabilities Borrower Loans Loans Held for Sale Notes Total Balance at January 1, 2024 $ 324,311 $ — $ (321,966) $ 2,345 Originations 51,854 487,830 (49,589) 490,095 Borrower Loans contributed by Parent, at Fair Value 1,634 — — 1,634 Principal repayments (48,124) — 49,806 1,682 Borrower Loans sold to third parties (1,490) (487,830) — (489,320) Other changes (186) — 299 113 Change in fair value (5,558) — 4,872 (686) Balance at March 31, 2024 $ 322,441 $ — $ (316,578) $ 5,863 Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Assets Liabilities Borrower Loans Loans Held for Sale Notes Total Balance at January 1, 2023 $ 320,642 $ — $ (318,704) $ 1,938 Originations 63,909 569,802 (62,643) 571,068 Principal repayments (45,487) — 46,283 796 Borrower Loans sold to third parties (953) (569,802) — (570,755) Other changes 105 — (51) 54 Change in fair value (7,809) — 7,429 (380) Balance at March 31, 2023 $ 330,407 $ — $ (327,686) $ 2,721 The following tables present additional information about Level 3 Servicing Assets recorded at fair value (in thousands): Servicing Assets Balance as of January 1, 2024 $ 13,818 Additions 2,503 Less: Changes in fair value (2,536) Balance as of March 31, 2024 $ 13,785 Servicing Assets Balance as of January 1, 2023 $ 14,860 Additions 2,939 Less: Changes in fair value (2,550) Balance as of March 31, 2023 $ 15,249 Loan Trailing Fee Liability The fair value of the Loan Trailing Fee Liability represents the present value of the expected monthly Loan Trailing Fee payments, which takes into consideration certain assumptions related to expected prepayment rates and default rates using a discounted cash flow model. The assumptions used are the same as those used for the valuation of Servicing Assets, as described below. The following tables present additional information about Level 3 Loan Trailing Fee Liability measured at fair value on a recurring basis (in thousands): Loan Trailing Fee Liability Balance as of January 1, 2024 $ 2,942 Issuances 488 Cash payment of Loan Trailing Fee (660) Change in fair value 168 Balance as of March 31, 2024 $ 2,938 Loan Trailing Fee Liability Balance as of January 1, 2023 $ 3,290 Issuances 589 Cash payment of Loan Trailing Fee (708) Change in fair value 137 Balance as of March 31, 2023 $ 3,308 Significant Recurring Level 3 Fair Value Asset and Liability Input Sensitivity Key economic assumptions are used to compute the fair value of Borrower Loans. The sensitivity of the fair value to immediate changes in assumptions at March 31, 2024 and December 31, 2023 for Borrower Loans are presented in the following table (in thousands, except percentages). Borrower Loans: March 31, 2024 December 31, 2023 Fair value, using the following assumptions: $ 322,441 $ 324,311 Weighted-average discount rate 7.32 % 6.55 % Weighted-average default rate 13.29 % 14.36 % Fair value resulting from: 100 basis point increase in discount rate $ 319,385 $ 321,204 200 basis point increase in discount rate $ 316,401 $ 318,174 Fair value resulting from: 100 basis point decrease in discount rate $ 325,577 $ 327,498 200 basis point decrease in discount rate $ 328,791 $ 330,766 Fair value resulting from: Applying a 1.1 multiplier to default rate $ 318,506 $ 319,708 Applying a 1.2 multiplier to default rate $ 314,593 $ 315,153 Fair value resulting from: Applying a 0.9 multiplier to default rate $ 326,399 $ 328,962 Applying a 0.8 multiplier to default rate $ 330,380 $ 333,662 Key economic assumptions are used to compute the fair value of Notes. The sensitivity of the fair value to immediate changes in assumptions at March 31, 2024 and December 31, 2023 for Notes funded through the Note Channel are presented in the following table (in thousands, except percentages). Notes March 31, 2024 December 31, 2023 Fair value, using the following assumptions: $ 316,578 $ 321,966 Weighted-average discount rate 7.31 % 6.55 % Weighted-average default rate 13.03 % 14.21 % Fair value resulting from: 100 basis point increase in discount rate $ 313,572 $ 318,877 200 basis point increase in discount rate $ 310,638 $ 315,863 Fair value resulting from: 100 basis point decrease in discount rate $ 319,660 $ 325,134 200 basis point decrease in discount rate $ 322,820 $ 328,384 Fair value resulting from: Applying a 1.1 multiplier to default rate $ 312,678 $ 317,359 Applying a 1.2 multiplier to default rate $ 308,800 $ 312,800 Fair value resulting from: Applying a 0.9 multiplier to default rate $ 320,499 $ 326,621 Applying a 0.8 multiplier to default rate $ 324,443 $ 331,325 Key economic assumptions are used to compute the fair value of Servicing Assets. The sensitivity of the current fair value to immediate changes in assumptions at March 31, 2024 and December 31, 2023 for Servicing Assets are presented in the following table (in thousands, except percentages). Servicing Assets March 31, 2024 December 31, 2023 Fair value, using the following assumptions: $ 13,785 $ 13,818 Weighted-average market servicing rate 0.65 % 0.65 % Weighted-average prepayment rate 19.78 % 19.96 % Weighted-average default rate 13.51 % 14.74 % Fair value resulting from: Market servicing rate increase of 0.025% $ 12,907 $ 12,945 Market servicing rate decrease of 0.025% $ 14,664 $ 14,691 Fair value resulting from: Applying a 1.1 multiplier to prepayment rate $ 13,471 $ 13,502 Applying a 0.9 multiplier to prepayment rate $ 14,105 $ 14,139 Fair value resulting from: Applying a 1.1 multiplier to default rate $ 13,503 $ 13,534 Applying a 0.9 multiplier to default rate $ 14,069 $ 14,104 These sensitivities are hypothetical and should be evaluated with care. The effect on fair value of a variation in assumptions generally cannot be determined because the relationship of the change in assumptions to the fair value may not be linear. Additionally, the impact of a variation in a particular assumption on the fair value is calculated while holding other assumptions constant. In reality, changes in one factor may lead to changes in other factors, which could impact the above hypothetical effects.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets, Net	3 Months Ended
	Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets, Net	Goodwill and Other Intangible Assets, Net Goodwill Prosper’s goodwill balance of $36.4 million at December 31, 2023 did not change during the three months ended March 31, 2024. The Company recorded no goodwill impairment for the three months ended March 31, 2024 and 2023. Other Intangible Assets The following table presents the detail of other intangible assets subject to amortization as of the following date (dollars in thousands): March 31, 2024 Gross Carrying Value Accumulated Amortization Net Carrying Value Remaining Useful Life (In Years) Developed technology $ 3,060 $ (3,060) $ — — User base and customer relationships 5,050 (4,986) 64 1.1 Brand name 60 (60) — — Total Intangible Assets subject to amortization $ 8,170 $ (8,106) $ 64 Prosper’s intangible asset balance w as $0.1 million and $0.1 million at March 31, 2024 and December 31, 2023, respectively. The user base and customer relationships intangible assets are being amortized on an accelerated basis over a three

Other Liabilities

Other Liabilities	3 Months Ended
	Mar. 31, 2024
Other Liabilities [Abstract]
Other Liabilities	Other Liabilities Other Liabilities consist of the following (in thousands): March 31, 2024 December 31, 2023 Operating lease liabilities (Note 16) $ 14,053 $ 14,431 Credit Card servicing obligation liability (Note 5) 8,836 9,732 Deferred revenue 6,652 6,373 Loan trailing fee liability 2,938 2,942 Deferred income tax liability 721 721 Other 828 1,060 Total Other Liabilities $ 34,028 $ 35,259 Additionally, disclosures around the operating lease liabilities are included in Note 16.

Debt

Debt	3 Months Ended
	Mar. 31, 2024
Debt Disclosure [Abstract]
Debt	Debt Term Loan Credit Agreement On November 14, 2022, the Company entered into a Credit Agreement with a third-party financial institution, which provides for a $75 million Term Loan maturing on November 14, 2026. Proceeds received from the Term Loan were net of an original issue discount and the Company also incurred approximately $0.4 million in debt issuance costs. Both the original issue discount and the debt issuance costs are being amortized over the life of the Term Loan to interest expense using the effective interest method. Interest Borrowings under the Term Loan accrue interest at the Secured Overnight Financing Rate (“SOFR”) plus 9.0% per annum. In addition, all borrowings under the Term Loan accrue payment-in-kind (“PIK”) interest at 2.0% per annum. Any accrued PIK interest that remains unpaid at the end of each month is added to the outstanding principal balance of the Term Loan. Guarantees and Collateral PMI’s obligations under the Term Loan are guaranteed by PHL and BillGuard. All obligations under the Credit Agreement are secured by a first priority, perfected lien on substantially all of the assets of PMI (subject to exclusions such as certain cash amounts and deposit accounts), PHL and BillGuard, as well as equity interests in all of PMI’s subsidiaries with the exception of PGT. Covenants and Other Matters The Credit Agreement contains a number of covenants that, among other things and subject to certain exceptions and thresholds, restrict PMI’s ability to incur certain new indebtedness; incur certain liens; sell or otherwise dispose of all or substantially all its assets; make loans, advances, and guarantees; and pay dividends or make other distributions on equity interests. In addition, the Credit Agreement contains certain financial covenants with which the Company must remain in compliance as of the last business day of each month during the life of the Term Loan: • a minimum tangible net worth • a minimum net liquidity • a maximum leverage ratio • a minimum asset coverage ratio The Company is in compliance with all covenant s as of March 31, 2024, as well as applicable monthly periods for the quarter then ended. The Credit Agreement also contains certain customary representations and warranties and affirmative covenants, and certain reporting obligations. In addition, the Term Loan lender will be permitted to accelerate all outstanding borrowings and exercise other specified remedies upon the occurrence of certain events of default (subject to certain grace periods and exceptions), which include, among other things, payment defaults, breaches of representations and warranties, covenant defaults, certain cross-defaults to other indebtedness, certain events of bankruptcy and insolvency, certain judgments and changes of control. Prosper Warehouse Trust Agreements Prosper’s consolidated warehouse VIEs, PWIT and PWIIT (together, the “Warehouse VIEs”), each entered into an agreement (together, the “Warehouse Agreements”) with certain lenders for committed revolving lines of credit (“Warehouse Lines”) during 2018 and 2019, respectively. In connection with the Warehouse Agreements, the Warehouse VIEs each entered into a security agreement with a bank as administrative agent and a national banking association as collateral trustee and paying agent. Proceeds under the Warehouse Lines could only be used to purchase certain unsecured consumer loans and related rights and documents from Prosper and to pay fees and expenses related to the Warehouse Lines. Both Warehouse VIEs are consolidated because Prosper is the primary beneficiary of the VIEs. The assets of the VIEs can be used only to settle obligations of the VIEs. Additionally, the creditors of the Warehouse Lines have no recourse to the general credit of Prosper. The loans held in the Warehouse VIEs are included in Loans Held for Sale, at Fair Value and Warehouse Lines are in Warehouse Lines in the condensed consolidated balance sheets. Both Warehouse Agreements contained certain covenants including restrictions on each Warehouse VIE's ability to incur indebtedness, pledge assets, merge or consolidate and enter into certain affiliate transactions. Each Warehouse Agreement also required Prosper to maintain a minimum tangible net worth of $25 million, minimum net liquidity of $15 million and a maximum leverage ratio of 5:1. Tangible net worth is defined as the sum of (i) (A) Convertible Preferred Stock, (B) total Stockholders’ Deficit and (C) Convertible Preferred Stock Warrant Liability, less the sum of (ii) (A) goodwill and (B) intangible assets. Net liquidity is defined as the sum of cash, cash equivalents and Available for Sale Investments. The leverage ratio is defined as the ratio of total consolidated indebtedness other than non-recourse securitization indebtedness, non-recourse or limited recourse warehouse indebtedness and borrower dependent notes, to tangible net worth. Through the dates of termination of each Warehouse Line, as discussed below, the Company was not in violation of any of these covenants. PWIT Warehouse Line On January 19, 2018, through PWIT, Prosper entered into a Warehouse Agreement for a Warehouse Line with a national banking association for a committed line of credit of $100 million. The PWIT Warehouse Agreement was subsequently amended in June 2018, June 2019, and May 2021, the cumulative impact of which was to increase the committed line of credit to $200 million, adjust the interest rate and unused commitment fee, expand the eligibility criteria for unsecured consumer loans that could be financed through the PWIT Warehouse Line and extend the term of the Warehouse Agreement. On May 5, 2023, PMI further amended its PWIT Warehouse Line (“PWIT 2023 Extension”). The PWIT 2023 Extension increased the maximum borrowing amount from $200 million to $244 million, consisting of a $200 million Class A loan with the existing PWIT Warehouse Line national banking association and a $44 million Class B loan with an asset manager. Under the PWIT 2023 Extension, the total advance rate was 91.5% and proceeds of loans purchased through the PWIT Warehouse Line could be borrowed, repaid and reborrowed until the earlier of June 20, 2024 or the occurrence of any accelerated amortization event or event of default. Repayment on any outstanding proceeds would be made over a 12-month period ending June 20, 2025, excluding the occurrence of any accelerated amortization event or event of default. Under the PWIT 2023 Extension, the Class A loan bore interest at a rate of one-month SOFR, plus a spread of 2.75% per annum, while the Class B loan bore interest at a rate of one-month SOFR, plus a spread of 8.50% per annum. Additionally, until June 20, 2024, both loans bore a daily unused commitment fee of 0.50% per annum on the undrawn portion available under each respective loan. In the fourth quarter of 2023, a loan performance ratio under the Warehouse Agreement was exceeded which resulted in the PWIT Warehouse Line entering accelerated amortization. While in accelerated amortization, all loan collections were applied against the outstanding balance of the PWIT Warehouse Line, and the Company was unable to utilize the undrawn portion. In addition, there was a 1% per annum step-up fee on the outstanding balance. On January 22, 2024, the Company executed an amendment to the PWIT Warehouse Agreement, under which previous breaches of loan performance ratios were waived, the loan performance ratios were revised going forward, and the step-up fee was waived until June 30, 2024. Additionally, the advance rate under the PWIT Warehouse Line was to gradually decrease by 1% on a monthly basis through June 2024, until it was reduced to 86.5%. In conjunction with the PMIT 2024-1 securitization (see Note 7, Securitizations ), the entire portfolio of Loans Held for Sale in the PWIT Warehouse Line, with an unpaid principal balance of $142.5 million as of March 28, 2024, was transferred to either the PMIT 2024-1 Transaction or PFL, as follows: $138.0 million of those Borrower Loans were contributed into the securitization trust through a depositor, and the remaining $4.5 million consisted of loans ineligible for securitization and were transferred to PFL through an equity contribution. Proceeds from the sale of these loans were used to pay down the outstanding principal and interest on the PWIT Warehouse Line of $130.4 million, and the PWIT Warehouse line was terminated a t that time. Remaining proceeds, net of transaction expenses, following the securitization transaction were transferred to PMI. As a result of the termination of the PWIT Warehouse Line, deferred and unamortized debt issuance costs of $0.7 million were immediately amortized into interest expense. Prosper maintained a swaption to limit the Company's exposure to increases in SOFR on up to $185.0 million of borrowings under the PWIT Warehouse Line. The swaption was recorded on the consolidated balance sheets at fair value in “Prepaids and Other Assets.” Any changes in the fair value were recorded in the “Change in Fair Value of Financial Instruments” on the condensed consolidated statement of operations. The swaption was terminated on March 28, 2024 upon repayment and termination of the PWIT Warehouse Line in conjunction with the PMIT 2024-1 securitization. The change in fair value of the swaption was immaterial for the three months ended March 31, 2024 and a loss of $0.5 million for the corresponding period in 2023. PWIIT Warehouse Line On March 28, 2019, through PWIIT, Prosper entered into a second Warehouse Agreement for a $300 million Warehouse Line with a national banking association different than that of PWIT. Subsequently on March 4, 2021, PMI extended its $300 million PWIIT Warehouse Line (“PWIIT 2021 Extension”). The PWIIT 2021 Extension consisted of a $230 million Class A loan with the existing PWIIT Warehouse Line national banking association and a $70 million Class B loan with an asset manager. On February 10, 2023, PMI again extended its PWIIT Warehouse Line (“PWIIT 2023 Extension”). The PWIIT 2023 Extension increased the maximum borrowing amount from $300 million to $450 million, consisting of a $400 million Class A loan with the existing PWIIT Warehouse Line national banking association and a $50 million Class B loan with the existing asset manager. In May 2023, the Company further amended the PWIIT Warehouse Line, which included replacing the existing Class B lender with another third-party asset manager and lowering the spread on Class B borrowings. In July 2023, the PWIIT Warehouse Line was further amended, decreasing the maximum borrowing amount from $450 million to $300 million, consisting of a $265 million Class A loan and a $35 million Class B loan. The Class A loan bore interest at a per annum rate of the national banking association's asset-backed commercial paper rate, plus a spread of 2.85%, while the Class B loan bore interest a per annum rate of adjusted one-month SOFR, plus a spread of 8.75%. In conjunction with the PMIT 2023-1 securitization (see Note 7, Securitizations ), the entire portfolio of Loans Held for Sale in the PWIIT Warehouse Line, with an unpaid principal balance of $273.8 million as of September 25, 2023, was transferred to either the PMIT 2023-1 securitization or PFL, as follows: $266.1 million of those Borrower Loans were contributed into the securitization trust through a depositor, and the remaining $7.7 million consisted of loans ineligible for securitization and were transferred to PFL through an equity contribution. Proceeds from the sale of these loans were used to pay down the outstanding principal and interest on the PWIIT Warehouse Line of $224.0 million, and the PWIIT Warehouse line was terminated at that time. Remaining proceeds, net of transaction expenses, following the securitization transaction were transferred to PMI. As a result of the termination of the PWIIT Warehouse Line, deferred and unamortized debt issuance costs of $1.9 million were immediately amortized into interest expense.

Net Income (Loss) Per Share

Net Income (Loss) Per Share	3 Months Ended
	Mar. 31, 2024
Earnings Per Share [Abstract]
Net Income (Loss) Per Share	Net Income (Loss) Per Share PMI computes its net income (loss) per share in accordance with ASC Topic 260, Earnings Per Share (“ASC Topic 260”). Under ASC Topic 260, basic net income (loss) per share is computed by dividing net income (loss) available to common stockholders by the weighted average number of common shares outstanding for the period and excludes the effects of any potentially dilutive securities. PMI’s net income (loss) per share is calculated using the two-class method in accordance with ASC Topic 260. The two-class method allocates earnings that otherwise would have been available to common shareholders to holders of participating securities. Management considers all series of our Convertible Preferred Stock to be participating securities due to their rights to participate in dividends with Common Stock. As such, earnings allocated to these participating securities, which include participation rights in undistributed earnings, are subtracted from net income to determine total undistributed earnings to be allocated to common stockholders. All participating securities are excluded from basic weighted-average common shares outstanding. Prior to any conversion to common shares, each series of Prosper’s Convertible Preferred Stock is entitled to participate on an if-converted basis in distributions of earnings, when and if declared by the board of directors, that are made to common stockholders and consequently, these shares were considered participating securities. During the three months ended March 31, 2024 and 2023, certain shares issued as a result of the early exercise of stock options which are subject to a repurchase right by PMI were entitled to receive non-forfeitable dividends during the vesting period and consequently, are considered participating securities. Basic and diluted net income (loss) per share were calculated as follows for the periods presented (in thousands, except share and per share amounts): Three Months Ended March 31, 2024 2023 Numerator: Net Income (Loss) $ 22,295 $ (9,090) Less: Net Income Allocated to Participating Securities (14,707) — Net Income (Loss) Attributable to Common Stockholders $ 7,588 $ (9,090) Denominator: Weighted average shares used in computing basic net income (loss) per share 77,070,847 75,187,033 Effect of dilutive securities: Stock options 48,443,891 — Warrants 391,431 — Convertible preferred stock warrants 213,264,845 — Weighted-average shares used in computing diluted net income (loss) per share 339,171,014 75,187,033 Net Income (Loss) Per Share – Basic $ 0.10 $ (0.12) Net Income (Loss) Per Share – Diluted $ 0.02 $ (0.12) The following common stock equivalents were excluded from the computation of diluted net income (loss) per share for the periods presented because including them would have been anti-dilutive: Three Months Ended March 31, 2024 2023 (shares) (shares) Excluded securities: Convertible preferred stock issued and outstanding, excluding shares held by consolidated VIE 158,365,655 158,365,655 Stock options issued and outstanding 32,923,114 78,133,890 Warrants issued and outstanding 688,918 1,080,349 Series E-1 convertible preferred stock warrants — 35,544,141 Series F convertible preferred stock warrants — 177,720,704 Total common stock equivalents excluded from diluted net income (loss) per common share computation 191,977,687 450,844,739

Convertible Preferred Stock, Co

Convertible Preferred Stock, Convertible Preferred Stock Warrant Liability and Common Stock	3 Months Ended
	Mar. 31, 2024
Stockholders' Equity Note [Abstract]
Convertible Preferred Stock, Convertible Preferred Stock Warrant Liability and Common Stock	Convertible Preferred Stock, Convertible Preferred Stock Warrant Liability and Common Stock Convertible Preferred Stock and Warrants Under PMI’s amended and restated certificate of incorporation, preferred stock is issuable in series, and the Board of Directors is authorized to determine the rights, preferences, and terms of each series. On July 13, 2020, the Company established Prosper Grantor Trust (“PGT”), a revocable grantor trust administered by an independent trustee, with the intention of contributing assets to PGT for the benefit of PMI employees in the event of a change in control through an Eligible Employee Retention Plan. PGT was determined to be a VIE and PMI was determined to be its primary beneficiary due to the fact that the Company, through its role as the grantor, has both (a) the power to direct the activities that most significantly affect the VIE’s economic performance, including its funding decisions and investment strategy, and (b) the obligation to absorb losses that could be potentially significant to the economic performance of the VIE by virtue of the Company’s requirement to fund PGT in the event that it is unable to meet its obligations to PMI’s employees. PMI also maintains a contingent call liability on PGT’s assets in the event of a bankruptcy. As a result, PGT is fully consolidated into PMI’s consolidated financial statements. On July 21, 2020, PGT entered into a Stock Transfer Agreement with a PMI investor to purchase 34,670,420 shares of Series A Convertible Preferred Stock and 16,577,495 shares of Series B Convertible Preferred Stock for nominal consideration. Upon execution of the Stock Transfer Agreement, these shares were purchased by a consolidated VIE of the Company, and thus the difference between the fair value of the repurchased stock and the purchase price is included in Convertible Preferred Stock Held by Consolidated VIE on PMI’s accompanying condensed consolidated balance sheets. These shares remain outstanding for legal purposes and retain their voting rights, but are excluded from the earnings per share calculation. The number of authorized, issued and outstanding shares, their par value and liquidation preference for each series of convertible preferred stock as of March 31, 2024 are disclosed in the table below (amounts in thousands except share and par value amounts): Convertible Preferred Stock Par Value Authorized Shares Outstanding and Issued Shares Liquidation Preference, Outstanding Shares Series A $ 0.01 68,558,220 66,428,185 * $ 19,160 Series A-1 $ 0.01 24,760,915 22,515,315 45,031 Series B $ 0.01 35,775,880 35,127,160 * 21,190 Series C $ 0.01 24,404,770 24,404,770 70,075 Series D $ 0.01 23,888,640 23,888,640 165,000 Series E-1 $ 0.01 35,544,141 — — Series E-2 $ 0.01 16,858,078 — — Series F $ 0.01 177,720,707 3 — Series G $ 0.01 37,249,497 37,249,497 50,000 Total 444,760,848 209,613,570 $ 370,456 * Series A and Series B Convertible Preferred Stock totals are inclusive of 34,670,420 and 16,577,495 shares, respectively, held by PGT, a consolidated VIE. Dividends Dividends on shares of the Series A, Series B, Series C, Series D, Series E-1, Series E-2, Series F and Series G convertible preferred stock are payable only when, as, and if declared by the Board of Directors. No dividends will be paid with respect to the common stock until any declared dividends on the Series A, Series B, Series C, Series D, Series E-1, Series E-2, Series F, and Series G convertible preferred stock have been paid or set aside for payment to the Series A, Series B, Series C, Series D, Series E-1, Series E-2, Series F, and Series G convertible preferred stockholders. After payment of any such dividends, any additional dividends or distributions will be distributed among all holders of common stock and preferred stock in proportion to the number of shares of common stock that would be held by each such holder if all shares of preferred stock were converted to common stock at the then-effective conversion rate. The Series A-1 convertible preferred shares have no dividend rights. To date, no dividends have been declared on any of PMI’s preferred stock or common stock. Conversion Under the terms of PMI’s amended and restated certificate of incorporation, the holders of preferred stock have the right to convert such preferred stock into common stock at any time. In addition, all preferred stock automatically converts into common stock (i) immediately prior to the closing of an initial public offering that values Prosper at least at $2 billion and that results in aggregate proceeds to Prosper of at least $100 million or (ii) upon a written request from the holders of at least 60% of the voting power of the outstanding preferred stock (on an as-converted basis), provided that (i) the Series A-1 convertible preferred stock shall not be converted without at least 14% of the voting power of the outstanding Series A-1 convertible preferred stock; (ii) the Series D shall not be converted without at least 60% of the voting power of the outstanding Series D; (iii) the Series E-1 and Series E-2 shall not be converted without at least 60% of the voting power of the outstanding Series E-1 and Series E-2, voting together as a single class; (iv) the Series F shall not be converted without at least 60% of the voting power of the outstanding Series F, and (v) the shares of Series G Preferred Stock will not be automatically converted unless the holders of at least 60% of the outstanding shares of Series G Preferred Stock approve such conversion. In addition, if a holder of the Series A convertible preferred stock has converted any of the Series A convertible preferred stock, then all of such holder’s shares of Series A-1 convertible preferred stock also will be converted upon a liquidation event (as defined under the certificate of incorporation). In lieu of any fractional shares of common stock to which a holder would otherwise be entitled, PMI shall pay such holder cash in an amount equal to the fair market value of such fractional shares, as determined by its Board of Directors. At present, each of the Series A, Series B, Series C, Series D, Series E-1, Series E-2, and Series F convertible preferred stock converts into PMI common stock at a 1:1 ratio. The Series A-1 convertible preferred stock converts into common stock at a 1,000,000:1 ratio and the Series G convertible preferred stock converts into common stock at a 1:1.36 ratio. The Series G convertible preferred stock conversion ratio reflects the Series G true-up that occurred at end of the vesting period for the Series E-2 and Series F Preferred Stock warrants. For the Series G true-up, the conversion price of the Series G Convertible Preferred Stock was reduced to a number equal to the Series G Preferred Stock original issuance price, divided by the quotient obtained by dividing the Series G true-up amount by the total number of Series G Preferred Stock issued as of the Series G closing date. The Series G true-up amount means the aggregate number of shares of Series G Preferred Stock that would have been issued to the purchasers of the Series G Preferred Stock on the Series G closing date, if warrants to purchase shares of Series E-2 Preferred Stock or Series F Preferred Stock that were exercisable or exercised as of the true-up time (end of vesting period) had been exercisable or exercised as of such Series G closing date. Liquidation Rights PMI’s convertible preferred stock has been classified as temporary equity on the condensed consolidated balance sheets. The preferred stock is not redeemable; however, in the event of a voluntary or involuntary liquidation, dissolution, change in control or winding up of PMI, holders of the convertible preferred stock may have the right to receive its liquidation preference under the terms of PMI’s certificate of incorporation. Each holder of Series E-1, Series E-2, and Series F convertible preferred stock is entitled to receive prior and in preference to any distribution of proceeds from a liquidation event (as defined under the certificate of incorporation) to the holders of Series A, Series B, Series C, Series D, Series G and Series A-1 convertible preferred stock or common stock, an amount per share for (i) each share of Series E-1 convertible preferred stock equal to the sum of the liquidation preference specified for such share and all declared but unpaid dividends, if any, on such share, (ii) each share of Series E-2 convertible preferred stock equal to the sum of two-thirds the liquidation preference specified for such share and all declared but unpaid dividends, if any, on such share, and (iii) each share of Series F convertible preferred stock equal to the sum of two-thirds of the liquidation preference specified for such share and all declared but unpaid dividends, if any, on such share. After the payment or setting aside for payment to the holders of Series E-1, Series E-2, and Series F convertible preferred stock, each holder of Series A, Series B, Series C and Series D, Series E-2, Series F, and Series G convertible preferred stock is entitled to receive, on a pari passu basis, prior to and in preference to any distribution of proceeds from a liquidation event (as defined under the certificate of incorporation) to the holders of Series A-1 convertible preferred stock or common stock, (i) an amount per share for each share of Series E-2 and Series F convertible preferred stock equal to the sum of one-third of the liquidation preference specified for such share and all declared but unpaid dividends, if any, on such share, and (ii) an amount per share for each share of Series A, Series B, Series C, Series D and Series G convertible preferred stock equal to the sum of the liquidation preference specified for such share and all declared but unpaid dividends, if any, on such share. After the payment or setting aside for payment to the holders of Series A, Series B, Series C, Series D, Series E-1, Series E-2, Series F, and Series G convertible preferred stock, the holders of Series A-1 convertible preferred stock are entitled to receive, prior and in preference to any distribution of proceeds to the holders of common stock, an amount per share for each such share of Series A-1 convertible preferred stock equal to the sum of the liquidation preference specified for such share and all declared but unpaid dividends, if any, on such share. After the payment or setting aside for payment to the holders of Series A, Series B, Series C, Series D, Series E-1, Series E-2, Series F, Series G, and Series A-1 convertible preferred stock, the entire remaining proceeds legally available for distribution will be distributed pro rata to the holders of Series A convertible preferred stock and common stock in proportion to the number of shares of common stock held by them assuming the Series A convertible preferred stock has been converted into shares of common stock at the then effective conversion rate, provided that the maximum aggregate amount per share of Series A convertible preferred stock which the holders of Series A convertible preferred stock shall be entitled to receive is three times the original issue price for the Series A convertible preferred stock. At present, the liquidation preferences are equal to $0.29 per share for the Series A convertible preferred stock, $2.00 per share for the Series A-1 convertible preferred stock, $0.60 per share for the Series B convertible preferred stock, $2.87 per share for the Series C convertible preferred stock, $6.91 per share for the Series D convertible preferred stock, $0.84 per share for the Series E-1 convertible preferred stock, $0.84 per share for the Series E-2 convertible preferred stock, $0.84 per share for the Series F convertible preferred stock and $1.34 per share for the Series G convertible preferred stock. Voting Each holder of shares of convertible preferred stock is entitled to the number of votes equal to the number of shares of common stock into which such shares of convertible preferred stock could be converted and has voting rights and powers equal to the voting rights and powers of the common stock. The holders of convertible preferred stock and the holders of common stock vote together as a single class (except with respect to certain matters that require separate votes or as required by law), and are entitled to notice of any stockholders’ meeting in accordance with the Bylaws of PMI. Convertible Preferred Stock Warrant Liability Series E-1 Warrants In connection with the Settlement and Release Agreement dated November 17, 2016 among PMI, its wholly owned subsidiary Prosper Funding LLC (“PFL”) and Colchis, on December 16, 2016, PMI issued the First Series E-1 Warrant for 20,267,135 shares of Series E-1 convertible preferred stock. The Second Series E-1 Warrant for an additional 15,277,006 shares of Series E-1 convertible preferred stock was granted on the signing of the Consortium Purchase Agreement (as described in Note 13 of PMI’s 10-K for the year ended December 31, 2023) on February 27, 2017. The Series E-1 warrants have an exercise price of $0.01 per share and expire ten years from the date of issuance. For the three months ended March 31, 2024 and 2023, Prosper recognized $4.6 million and $0.7 million of income, respectively, from the re-measurement of the fair value of the warrants. The income or expense resulted from the remeasurement of the fair value of the warrants is recorded in Change in Fair Value of Convertible Preferred Stock Warrants on the condensed consolidated statements of operations. To determine the fair value of the Series E-1 Warrants, the Company first determined the value of a share of Series E-1 Convertible Preferred Stock. To determine the fair value of the Convertible Preferred Stock, the Company first derived the business enterprise value (“BEV”) of the Company using a variety of valuation methods, including discounted cash flow models and market based methods, as deemed appropriate under the circumstances applicable at the valuation date. Once the Company determined an estimated BEV, the option pricing method (“OPM”) was used to allocate the BEV to the various classes of our equity, including our preferred stock. The concluded per share value for the Series E-1 Convertible Preferred Stock was utilized as an input to the Black-Scholes option pricing model. The Company determined the fair value of the outstanding Series E-1 preferred stock warrants utilizing the following assumptions as of the following dates: March 31, 2024 December 31, 2023 Volatility 65.0 % 66.0 % Risk-free interest rate 4.40 % 4.10 % Expected term (in years) 2.75 2.75 Dividend yield — % — % The above assumptions were determined as follows: Volatility: The volatility is derived from historical volatilities of several unrelated publicly listed peer companies over a period approximately equal to the term of the warrant as the Company has limited information on the volatility of its preferred stock since there is currently no trading history. When making the selections of industry peer companies to be used in the volatility calculation, the Company considered the size, operational, and economic similarities to the Company’s principal business operations. Risk-Free Interest Rate: The risk-free interest rate is based on the U.S. Treasury yield in effect as of March 31, 2024, and for zero coupon U.S. Treasury notes with maturities approximately equal to the term of the warrant. Expected Term: The expected term is the period of time for which the warrants are expected to be outstanding. Dividend Yield: The expected dividend assumption is based on the Company’s current expectations about the Company’s anticipated dividend policy. Series F Warrants In connection with the Consortium Purchase Agreement on February 27, 2017, PMI issued warrants to purchase up to 177,720,706 shares of PMI's Series F convertible preferred stock at $0.01 per share. The warrants expire ten years from the date of issuance. For the three months ended March 31, 2024 and 2023, Prosper recognized $23.1 million and $3.6 million of income, respectively, from the re-measurement of the fair value of the warrants. The income or expense resulting from changes in the fair value of the warrant is recorded through Change in Fair Value of Convertible Preferred Stock Warrants on the condensed consolidated statements of operations. To determine the fair value of the Series F Warrants, the Company first determined the value of a share of Series F Convertible Preferred Stock. To determine the fair value of the Convertible Preferred Stock, the Company first derived the BEV using valuation methods, including a combination of m ethods, as deemed appropriate under the circumstances applicable at the valuation date. Once the Company determined an estimated BEV, the OPM was used to allocate the BEV to the various classes of Prosper's equity, including our preferred stock. The concluded per share value for the Series F Convertible Preferred Stock warrants utilized the Black-Scholes option pricing model. The Company determined the fair value of the outstanding Series F Warrants utilizing the following assumptions as of the following dates: March 31, 2024 December 31, 2023 Volatility 65.0 % 66.0 % Risk-free interest rate 4.40 % 4.10 % Expected term (in years) 2.75 2.75 Dividend yield — % — % The above assumptions were determined using the same criteria described above for the Series E-1 Warrants. The combined activity of the Convertible Preferred Stock Warrant Liability for the three months ended March 31, 2024 and 2023 are presented in Note 8, Fair Value of Assets and Liabilities . Starting with the Series E and F Warrant valuations prepared as of September 30, 2023, due to a change in methodology, the Company removed the discount for lack of marketability that was previously applied to the Black-Scholes option pricing valuation. If a discount for lack of marketability was applied to the valuation as of March 31, 2024, it would reduce the Convertible Preferred Stock Warrant Liability by approximately $36.4 million. Common Stock PMI, through its Amended and Restated Certificate of Incorporation, is the sole issuer of common stock and related options, RSUs and warrants. On February 16, 2016, PMI amended and restated its Certificate of Incorporation to, among other things, effect a 5-for-1 forward stock split. On September 20, 2017, PMI further amended its Amended and Restated Certificate of Incorporation to increase the number of shares of common stock authorized for issuance. The total number of shares of stock which PMI has the authority to issue is 1,069,760,848, consisting of 625,000,000 shares of common stock, $0.01 par value per share, and 444,760,848 shares of preferred stock, $0.01 par value per share. As described above, the Company repurchased 2,196,665 shares of Common Stock on December 23, 2019. As of March 31, 2024 , 78,112,888 shares of common stock were issued and 77,176,953 shares of common stock were outstanding. As of December 31, 2023 , 77,861,329 shares of common stock were issued and 76,925,394 shares of common stock were outstanding. Each holder of common stock is entitled to one vote for each share of common stock held. Common Stock Issued upon Exercise of Stock Options For the three months ended March 31, 2024, PMI issued

Stock-Based Compensation

Stock-Based Compensation	3 Months Ended
	Mar. 31, 2024
Share-Based Payment Arrangement [Abstract]
Stock-Based Compensation	Stock-Based Compensation PMI grants equity awards primarily through its Amended and Restated 2005 Stock Option Plan (the “2005 Plan”), which was approved as amended and restated by its stockholders on December 1, 2010; and its 2015 Equity Incentive Plan, which was approved by its stockholders on April 7, 2015 and subsequently amended by an Amendment No. 1, Amendment No. 2 and Amendment No. 3, which were approved by PMI's stockholders effective as of February 15, 2016, May 31, 2016, and September 5, 2018 respectively (as amended, the “2015 Plan”). In March 2015, the 2005 Plan expired, except that any awards granted under the 2005 Plan prior to its expiration remain in effect pursuant to their terms. Stock Option Activity Stock option activity under the 2005 Plan and 2015 Plan is summarized for the three months ended March 31, 2024 below: Options Issued and Outstanding Weighted Average Exercise Price Balance as of January 1, 2024 82,113,271 $ 0.15 Options issued 3,854,515 $ 0.40 Options exercised (251,559) $ 0.03 Options forfeited (2,382,025) $ 0.18 Options expired (15,000) $ 0.02 Balance as of March 31, 2024 83,319,202 $ 0.16 Options vested and expected to vest as of March 31, 2024 76,528,968 $ 0.16 Options vested and exercisable as of March 31, 2024 60,750,156 $ 0.09 Other Information Regarding Stock Options The weighted-average remaining contractual term for options outstanding as of March 31, 2024 is 5.65 years . The fair value of options granted to employees is estimated on the grant date using the Black-Scholes option valuation model. This valuation model for stock-based compensation expense requires PMI to make assumptions and judgments about the variables used in the calculation, including the fair value of PMI’s common stock, the expected term (the period of time that the options granted are expected to be outstanding), the volatility of PMI’s common stock, a risk-free interest rate, and expected dividends. Given the absence of a publicly traded market, the Company considered numerous objective and subjective factors to determine the fair value of PMI’s common stock at each grant date. These factors included, but were not limited to: (i) contemporaneous valuations of common stock performed by unrelated third-party specialists, (ii) the prices for PMI’s preferred stock sold to outside investors, (iii) the rights, preferences and privileges of PMI’s preferred stock relative to PMI’s common stock, (iv) the lack of marketability of PMI’s common stock, (v) developments in the business, (vi) secondary transactions of PMI’s common and preferred shares, and (vii) the likelihood of achieving a liquidity event, such as an initial public offering or a merger or acquisition of Prosper, given prevailing market conditions. As PMI’s stock is not publicly traded, volatility for stock options is based on an average of the historical volatilities of the common stock of several entities with characteristics similar to those of PMI. The expected term assumptions were determined based on the vesting terms, exercise terms and contractual lives of the options using the simplified method. The risk-free rate is based on the U.S. Treasury yield curve in effect at the time of grant for periods corresponding with the expected life of the option. PMI uses an expected dividend yield of zero as it does not anticipate paying any dividends in the foreseeable future. PMI also estimates forfeitures of unvested stock options. Expected forfeitures are based on the Company’s historical experience. To the extent actual forfeitures differ from the estimates, the difference will be recorded as a cumulative adjustment in the period estimates are revised. No compensation cost is recorded for options that do not vest. The fair value of PMI’s stock option awards granted during the three months ended March 31, 2024 and 2023 was estimated at the date of grant using the Black-Scholes model with the following average assumptions: Three Months Ended March 31, 2024 2023 Volatility of common stock 66.30 % 66.69 % Risk-free interest rate 4.17 % 3.67 % Expected life (in years) 6.0 years 6.0 years Dividend yield — % — % Restricted Stock Unit Activity In previous years, PMI granted RSUs to certain employees that are subject to three-year or four-year vesting terms and the occurrence of a liquidity event. The following table summarizes the number of PMI’s RSU activity for three months ended March 31, 2024: Number of Shares Weighted-Average Grant Date Fair Value Unvested at January 1, 2024 2,574,633 $ 1.03 Forfeited (9,500) $ 2.18 Unvested at March 31, 2024 2,565,133 $ 1.02 Share Based Compensation The following table presents the amount of stock-based compensation related to stock-based awards granted to employees recognized in Prosper’s condensed consolidated statements of operations for the periods presented (in thousands): Three Months Ended March 31, 2024 2023 Origination and servicing $ 19 $ 21 Sales and marketing 113 36 General and administrative 260 311 Total stock-based compensation $ 392 $ 368 As of March 31, 2024 , the unamortiz ed stock-based compensation expense, adjusted for forfeiture estimates, related to unvested stock-based awards was approximately $3.0 million, which will be recognized over a remaining weighted-average vesting period of approximately 2.6 years.

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2024
Entity Information [Line Items]
Income Taxes	Income Taxes For the three months ended March 31, 2024 and 2023, PMI recogniz e d $26 thousand and $70 thousand of income tax expense, respectively. The income tax expense relates to state income tax expense and the amortization of tax deductible goodwill which gives rise to an indefinite-lived deferred tax liability. No other income tax expense or benefit was recorded for the three month periods ended March 31, 2024 and 2023 due to a full valuation allowance recorded against the Company’s deferred tax assets . Management assesses the available positive and negative evidence to estimate if sufficient future taxable income will be generated to utilize our existing deferred tax assets. On the basis of this evaluation, it is not more likely than not that our deferred tax assets will be realized and therefore a full valuation allowance has been recorded.
Prosper Funding LLC
Entity Information [Line Items]
Income Taxes	Income Taxes PFL incurred no income tax provision for the three months ended March 31, 2024 and 2023. PFL is a U.S. disregarded entity and its income and loss are included in the income tax reporting of its parent, PMI. Since PMI is in a taxable loss position, is not currently subject to income taxes, and has fully reserved against its deferred tax asset, the net effective tax rate for PFL is 0%.

LEASES

LEASES	3 Months Ended
	Mar. 31, 2024
Leases [Abstract]
LEASES	Leases Prosper has operating leases for corporate offices and a data center. These leases have remaining lease terms of less than one year to approximately five years . Some of the lease agreements include options to extend the lease term for up to an additional five years. Rental expense under operating lease arrangements was $1.0 million and $1.1 million for the three months ended March 31, 2024 and 2023. Additionally, Prosper subleases certain leased office space to third parties when it determines there is excess leased capacity. Sublease income from operating lease arrangements was $0.1 million and $0.2 million for the three months ended March 31, 2024 and 2023. Operating Lease Right-of-Use (“ROU”) Assets The following table summarizes the operating lease right-of-use assets as of March 31, 2024, which are included in “Property and Equipment, Net” on the condensed consolidated balance sheets. March 31, 2024 Gross Carrying Value Accumulated Amortization Net Carrying Value ROU Assets - Office buildings $ 22,690 $ 12,347 $ 10,343 No impairment charge was identified for the three months ended March 31, 2024 and 2023 . In March 2024, the Company entered into an amendment to its Phoenix office lease, the most prominent impact of which was to extend the lease term for an additional period through October 2029. As a result of this lease modification, the Company recorded additional ROU operating lease assets and liabilities of $0.3 million. Lease Liabilities Future maturities of operating lease liabilities as of March 31, 2024 were as follows (in thousands). The present value of the future minimum lease payments represents our operating lease liabilities as of March 31, 2024 and are included in " Other Liabilities March 31, 2024 Remainder of 2024 $ 3,181 2025 4,247 2026 4,648 2027 3,834 2028 1,948 Thereafter 411 Total future minimum lease payments $ 18,269 Less imputed interest (4,216) Present value of future minimum lease payments $ 14,053 Because the rate implicit in each lease is not readily determinable, we use our incremental borrowing rate to determine the present value of the lease payments. Other information related to leases was as follows (dollars in thousands): March 31, 2024 Weighted average remaining lease term (in years) 4.07 years Weighted average discount rate 12.50 %

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2024
Entity Information [Line Items]
Commitments and Contingencies	Commitments and Contingencies In the normal course of its operations, Prosper becomes involved in various legal actions. Prosper maintains provisions it considers to be adequate for such actions. Prosper does not believe it is probable that the ultimate liability, if any, arising out of any such matters will have a material effect on Prosper's financial condition, results of operations or cash flows. Operating Commitments PMI, along with PFL, and WebBank have entered into: (i) an Asset Sale Agreement, dated July 1, 2016, between PFL and WebBank, as most recently amended by a Seventh Amendment dated February 28, 2024 (as amended, the “Sale Agreement”); (ii) the Marketing Agreement, dated July 1, 2016, between PMI and WebBank, as most recently amended by a Seventh Amendment dated February 28, 2024 (as amended, the “Marketing Agreement”); and (iii) the Stand By Purchase Agreement, dated July 1, 2016, between PMI and WebBank, as most recently amended by a Fourth Amendment dated February 28, 2024 (as amended, the “Purchase Agreement” and, collectively with the Sale Agreement and the Marketing Agreement, the “Origination and Sale Agreements”). Under the Origination and Sale Agreements, all Borrower Loans originated through the marketplace are made by WebBank under its bank charter. The Origination and Sale Agreements contain terms through February 1, 2027. Prosper is required, under the Origination and Sale Agreements, to maintain certain collateral requirements. In addition, pursuant to the Marketing Agreement, the marketing fee that Prosper receives in connection with the origination of each loan is partially reduced by an amount (the “Designated Amount”) calculated as a percentage of the principal amount of such loan based on the aggregate principal amount of loans originated for the applicable month. To the extent the aggregate Designated Amount for all loans originated during any month is less than $100,000 through February 1, 2027, Prosper is required to pay WebBank an amount equal to such deficiency. Accordingly, t he minimum fee is $0.9 million for the remaining nine months of 2024, $1.2 million in 2025, $1.2 million in 2026 and $0.1 million in 2027. Additionally, under the Origination and Sale Agreements, Prosper is required to maintain a minimum net liquidity of $15.0 million at all times during the term of the agreement. Net liquidity is defined as the sum of Cash, Cash Equivalents and Available for Sale Investments. Violation of this covenant can result in termination of the contract with WebBank. As of March 31, 2024 , the Company was in compliance with the covenant. Transaction Fee Refunds Prosper assumes WebBank’s liability under Utah law to refund the pro-rated amount of any transaction fees collected in excess of 5%, in the event the underlying borrower prepays the loan before full maturity. The Company has accrued $3.9 million and $1.6 million as of March 31, 2024 and December 31, 2023, respectively, related to anticipated future refunds under this obligation. Loan Purchase Commitments Prosper entered into an agreement with WebBank to purchase $15.0 million of Borrower Loans that WebBank originated during the last two business days of the quarter ended March 31, 2024. Prosper will purchase these Borrower Loans within the first two business days of the quarter ending June 30, 2024. Repurchase Obligation Under the terms of the loan purchase agreements between Prosper and investors that participate in the Whole Loan Channel, Prosper may, in certain circumstances, become obligated to repurchase a Borrower Loan from an investor. Generally, these circumstances include the occurrence of verifiable identity theft, the failure to properly follow personal loan listing or bidding protocols or a violation of the applicable federal, state or local lending laws. Prosper recognizes a liability at fair value for the repurchase obligation when the Borrower Loans are sold. The fair value of the repurchase obligation is estimated based on historical experience. Repurchased Borrower Loans associated with violations of federal, state or local lending laws or verifiable identity theft are written off at the time of repurchase. The maximum potential amount of future payments associated with this obligation is the outstanding balances of the Borrower Loans issued to third parties through the Whole Loan Channel, which at March 31, 2024 is $3.1 billion . Prosper has accrued $0.4 million a nd $0.5 million as of March 31, 2024 and December 31, 2023, respectively, in regard to this obligation. Under the terms of the indenture and investor registration agreement, Prosper may, in certain circumstances, become obligated to either repurchase a Note or indemnify the investor for any losses resulting from nonpayment of a Note purchased in the Retail Channel. The decision to repurchase or indemnify is in Prosper’s sole discretion. These circumstances include, but are not limited to, the occurrence of verifiable identity theft, a technical error in the automated bidding tools which results in the purchase of a Note that does not match the investor’s investment criteria, or situations in which a personal loan listing includes a Prosper Rating that is different from the Prosper Rating that should have appeared in the listing for the corresponding Borrower Loan because either PFL inaccu rately input data into, or inaccurately applied, the formula for determining the Prosper Rating and, as a result, the interest of the investor is materially and adversely affected. During the three months ended March 31, 2024 the Company repurchased $0.1 million of Notes under these circumstances, and has agreed to indemnify additional Notes with an unpaid principal balance of $0.7 million as of March 31, 2024. Regulatory Contingencies Prosper accrues for contingencies when a loss from such contingencies is probable and the amount of loss can be reasonably estimated. In determining whether a loss is probable and if it is possible to quantify the amount of the estimated loss, Prosper reviews and evaluates its litigation and regulatory matters on at least a quarterly basis in light of potentially relevant factual and legal developments. If Prosper determines that an unfavorable outcome is not probable or that the amount of a loss cannot be reasonably estimated, Prosper does not accrue for a potential litigation loss. If an unfavorable outcome is probable and Prosper can estimate a range of outcomes, an amount is recorded which management considers to be the best estimate within the range of potential losses that are both probable and estimable; however, if management cannot quantify the amount of the estimated loss, then the low end of the range of the potential losses is recorded. West Virginia Matter In February 2020, Prosper received a proposed Assurance of Discontinuance (an “AOD”) from the Attorney General of the State of West Virginia (the “WV Attorney General”) requesting that, without in any way admitting that any of its prior practices were in violation of the West Virginia Consumer Credit and Protection Act (the “Consumer Act”), Prosper agree to certain terms and conditions regarding its past and potential future conduct of its business with respect to customers in West Virginia, including a release by the WV Attorney General of any claims it may have related to the matters identified in the AOD. No loans have been originated through the Prosper platform to West Virginians since June 2016 and the final loan originated through the Prosper platform to a borrower in West Virginia was repaid in October 2021.
Prosper Funding LLC
Entity Information [Line Items]
Commitments and Contingencies	Commitments and Contingencies In the normal course of its operations, PFL becomes involved in various legal actions. PFL maintains provisions it considers to be adequate for such actions. The Company does not believe it is probable that the ultimate liability, if any, arising out of any such matters will have a material effect on financial condition, results of operations or cash flows. Operating Commitments PMI, along with PFL, and WebBank has entered into: (i) an Asset Sale Agreement, dated July 1, 2016, between PFL and WebBank, as most recently amended by a Seventh Amendment dated February 28, 2024 (as amended, the “Sale Agreement”); (ii) the Marketing Agreement, dated July 1, 2016, between PMI and WebBank, as most recently amended by a Seventh Amendment dated February 28, 2024 (as amended, the “Marketing Agreement”); and (iii) the Stand By Purchase Agreement, dated July 1, 2016, between PMI and WebBank, as most recently amended by a Fourth Amendment dated February 28, 2024 (as amended, the “Purchase Agreement” and, collectively with the Sale Agreement and the Marketing Agreement, the “Origination and Sale Agreements”). Under the Origination and Sale Agreements, all Borrower Loans originated through the marketplace are made by WebBank under its bank charter. The Origination and Sale Agreements contain terms through February 1, 2027. Prosper is required, under the Origination and Sale Agreements, to maintain certain collateral requirements. In addition, pursuant to the Marketing Agreement, the marketing fee that Prosper receives in connection with the origination of each loan is partially reduced by an amount (the “Designated Amount”) calculated as a percentage of the principal amount of such loan based on the aggregate principal amount of loans originated for the applicable month. To the extent the aggregate Designated Amount for all loans originated during any month is less than $100,000 through February 1, 2027, Prosper is required to pay WebBank an amount equal to such deficiency. Accordingly, the minimum fee is $0.9 million for the remaining nine months of 2024, $1.2 million in 2025, $1.2 million in 2026 and $0.1 million in 2027. Additionally, under the Origination and Sale Agreements, Prosper is required to maintain a minimum net liquidity of $15.0 million at all times during the term of the agreement. Net liquidity is defined as the sum of Cash, Cash Equivalents and Available for Sale Investments. Violation of this covenant can result in termination of the contract with WebBank. As of March 31, 2024 , the Company was in compliance with the covenant. Transaction Fee Refunds Prosper assumes WebBank’s liability under Utah law to refund the pro-rated amount of any transaction fees collected in excess of 5%, in the event the underlying borrower prepays the loan before full maturity. PFL has accrued $3.9 million and $1.6 million as of March 31, 2024 and December 31, 2023, respectively, related to anticipated future refunds under this obligation. Loan Purchase Commitments Under the terms of PFL’s agreement with WebBank, PFL is committed to purchase $15.0 million of Borrower Loans that WebBank originated during the last two business days of the quarter ended March 31, 2024. PFL will purchase these Borrower Loans within the first three business days of the quarter ending June 30, 2024. Repurchase Obligation Under the terms of the loan purchase agreements between PFL and investors that participate in the Whole Loan Channel, PFL may, in certain circumstances, become obligated to repurchase a Borrower Loan from an investor. Generally, these circumstances include the occurrence of verifiable identity theft, the failure to properly follow personal loan listing or bidding protocols, or a violation of the applicable federal, state, or local lending laws. The fair value of the indemnification and repurchase obligation is estimated based on historical experience. PFL recognizes a liability for the repurchase and indemnification obligation when the Borrower Loans are issued. Indemnified or repurchased Borrower Loans associated with violations of federal, state, or local lending laws or verifiable identity theft are written off at the time of repurchase or at the time an indemnification payment is made. The maximum potential amount of future payments associated under this repurchase obligation is the outstanding balances of the Borrower Loans issued through the Whole Loan Channel, which as of March 31, 2024 is $3.5 billion . PFL has acc rued $0.4 million and $0.5 million as of March 31, 2024 and December 31, 2023, respectively, in regard to this obligation. Under the terms of the indenture and investor registration agreement, Prosper may, in certain circumstances, become obligated to either repurchase a Note or indemnify the investor for any losses resulting from nonpayment of a Note purchased in the Retail Channel. The decision to repurchase or indemnify is in Prosper’s sole discretion. These circumstances include, but are not limited to, the occurrence of verifiable identity theft, a technical error in the automated bidding tools which results in the purchase of a Note that does not match the investor’s investment criteria, or situations in which a personal loan listing includes a Prosper Rating that is different from the Prosper Rating that should have appeared in the listing for the corresponding Borrower Loan because either PFL inaccurately input data into, or inaccurately applied, the formula for determining the Prosper Rating and, as a result, the interest of the investor is materially and adversely affected . During the three months ended March 31, 2024 the Company repurchased $0.1 million of Notes under these circumstances, and has agreed to indemnify additional Notes with an unpaid principal balance of $0.7 million as of March 31, 2024. Regulatory Contingencies PFL accrues for contingencies when a loss from such contingencies is probable and the amount of loss can be reasonably estimated. In determining whether a loss is probable and if it is possible to quantify the amount of the estimated loss, PFL reviews and evaluates its litigation and regulatory matters on at least a quarterly basis in light of potentially relevant factual and legal developments. If PFL determines that an unfavorable outcome is not probable or that the amount of a loss cannot be reasonably estimated, PFL does not accrue for a potential litigation loss. If an unfavorable outcome is probable and PFL can estimate a range of outcomes, PFL records the amount management considers to be the best estimate within the range of potential losses that are both probable and estimable; however, if management cannot quantify the amount of the estimated loss, then PFL records the low end of the range of those potential losses. West Virginia Matter In February 2020, Prosper received a proposed Assurance of Discontinuance (an “AOD”) from the Attorney General of the State of West Virginia (the “WV Attorney General”) requesting that, without in any way admitting that any of its prior practices were in violation of the West Virginia Consumer Credit and Protection Act (the “Consumer Act”), Prosper agree to certain terms and conditions regarding its past and potential future conduct of its business with respect to customers in West Virginia, including a release by the WV Attorney General of any claims it may have related to the matters identified in the AOD. We cannot predict the outcome of the matter and any potential fines or penalties, if any, that may arise from the matter. Further, we are unable to estimate a range of outcomes and as a result no accrual has been made. No loans have been originated through the Prosper platform to West Virginians since June 2016 and the final loan originated through the Prosper platform to a borrower in West Virginia was repaid in October 2021.

Related Parties

Related Parties	3 Months Ended
	Mar. 31, 2024
Entity Information [Line Items]
Related Parties	Related Parties Since Prosper’s inception, it has engaged in various transactions with its directors, executive officers, and holders of more than 10% of its voting securities, and immediate family members and other affiliates of its directors, executive officers, and 10% stockholders. Prosper believes that all of the transactions described below were made on terms no less favorable to Prosper than could have been obtained from unaffiliated third parties. Prosper’s executive officers, directors who are not executive officers, and certain affiliates participate in its marketplace by placing bids and purchasing Notes. The aggregate amount of the Notes purchased and the income earned by parties deemed to be affiliates and related parties of Prosper for the three months ended March 31, 2024 and 2023, as well as the Notes outstanding as of March 31, 2024 and December 31, 2023 are summarized below (in thousands): Aggregate Amount of Interest Earned on Notes Related Party 2024 2023 2024 2023 Executive officers and management $ 12 $ 9 $ 3 $ 2 Directors (excluding executive officers and management) — — — — Total $ 12 $ 9 $ 3 $ 2 Notes Balance as of Related Party March 31, 2024 December 31, Executive officers and management $ 64 $ 64 Directors (excluding executive officers and management) 1 1 Total $ 65 $ 65
Prosper Funding LLC
Entity Information [Line Items]
Related Parties	Related Parties Since inception, PFL has engaged in various transactions with its directors, executive officers, PMI, and immediate family members and other affiliates of its directors, executive officers, and PMI. PFL believes that all of the transactions described below were made on terms no less favorable to PFL than could have been obtained from unaffiliated third parties. PFL’s executive officers and directors who are not executive officers participate in its marketplace by placing bids and purchasing Notes. The aggregate amount of the Notes purchased and the income earned by parties deemed to be related parties of PFL for the three months ended March 31, 2024 and 2023 are summarized below (in thousands): Aggregate Amount of Notes Purchased Interest Earned on Notes Three Months Ended March 31, Three Months Ended March 31, Related Party 2024 2023 2024 2023 Executive officers and management $ 8 $ 8 $ 2 $ 2 Directors (excluding executive officers and management) — — — — Total $ 8 $ 8 $ 2 $ 2 The balance of Notes held by officers and directors who are not executive officers are as follows (in thousands): Notes Balance as of Related Party March 31, 2024 December 31, 2023 Executive officers and management $ 47 $ 47 Directors (excluding executive officers and management) — — Total $ 47 $ 47

Significant Concentrations

Significant Concentrations	3 Months Ended
	Mar. 31, 2024
Risks and Uncertainties [Abstract]
Significant Concentrations	Significant Concentrations Prosper is dependent on third-party funding sources such as banks, asset managers, investment funds and Warehouse Lines to provide the funds to allow WebBank to originate Borrower Loans that the third-party funding sources will later purchase. Of all Borrower Loans originated in the three months ended March 31, 2024, five individual third parties purchased 31.3%, 19.3%, 12.1%, 10.3% and 10.3% of all Borrower Loans originated. There were no purchases of such loans by the Company’s VIEs during the three months ended March 31, 2024. For the three months ended March 31, 2023, individual third parties purchased 11.1% and 10.2% of all Borrower Loans originated, and the Company’s Warehouse VIEs purchased 20.0% of such loans. Prosper receives all of its personal loan transaction fee revenue from WebBank. Prosper earns a transaction fee from WebBank for its services in facilitating originations of Borrower Loans issued by WebBank. The rate of the transaction fee for each individual Borrower Loan is based on the term and credit grade of the Borrower Loan. Starting in the fourth quarter of 2023, the Company raised its transaction fee cap from 5.0% to 7.99% for certain newly originated loans. No individual borrower or investor accounted for 10% or more of consolidated net revenue for any of the periods presented.

Segments

Segments	3 Months Ended
	Mar. 31, 2024
Entity Information [Line Items]
Segments	Segments Starting with the fourth quarter of 2022, the Company realigned its reportable and operating segments to better reflect the nature and materiality of its product offerings. As a result of these changes, the Company now has three reportable and operating segments: Personal Loan, Home Equity and Credit Card. The Company’s Chief Executive Officer, who serves as the chief operating decision maker (“CODM”) evaluates the financial performance of the Company’s segments based upon segment revenues, as well as segment Adjusted Net Revenue and segment Adjusted EBITDA, both non-GAAP profitability measures. Items outside of Adjusted EBITDA are not reported by segment, since they are excluded from the measure of segment profitability reviewed by the CODM. The Company’s CODM does not use segment assets to allocate resources or to assess performance of the segments and, therefore, total segment assets have not been disclosed. The tables below present segment information reconciled to consolidated Total Net Revenue and Net Income (Loss) Before Income Taxes, as well as interest income and expense included in segment Adjusted Net Revenue and Adjusted EBITDA, for the periods indicated (in thousands). Three Months Ended March 31, 2024 Personal Loan Home Equity Credit Card Total Total Net Revenue $ 30,968 $ 297 $ 12,228 $ 43,493 Impact of interest rates on fair value of loans held in consolidated trusts 2,067 — — 2,067 Accelerated amortization of PWIT debt issuance costs 733 — — 733 Segment Adjusted Net Revenue $ 33,768 $ 297 $ 12,228 $ 46,293 Segment Adjusted EBITDA $ (1,018) $ 44 $ 4,008 $ 3,034 Depreciation expense: Origination and Servicing (2,392) General and Administration - Other (488) Amortization of intangibles (20) Stock-based compensation (392) Change in Fair Value of Convertible Preferred Stock Warrants 27,724 Impact of interest rates on fair value of loans held in consolidated trusts (2,067) Interest income on cash and cash equivalents 875 Interest Expense on Term Loan (3,220) Accelerated amortization of PWIT debt issuance costs (733) Net Income Before Income Taxes $ 22,321 Interest Income (Expense) Included in Segment Adjusted EBITDA Interest Income on Borrower Loans and Loans Held for Sale $ 24,236 $ — $ — $ 24,236 Interest Expense on Financial Instruments (21,025) — — (21,025) Accelerated amortization of PWIT debt issuance costs 733 — — 733 Total Interest Income, Net $ 3,944 $ — $ — $ 3,944 Three Months Ended March 31, 2023 Personal Loan Home Equity Credit Card Total Total Net Revenue $ 33,494 $ 293 $ 6,585 $ 40,372 Impact of interest rates on fair value of loans held in consolidated trusts 1,206 — — 1,206 Segment Adjusted Net Revenue $ 34,700 $ 293 $ 6,585 $ 41,578 Segment Adjusted EBITDA $ (5,281) $ (873) $ (183) $ (6,337) Depreciation expense: Origination and Servicing (2,126) General and Administration - Other (624) Amortization of intangibles (27) Stock-based compensation (368) Change in Fair Value of Convertible Preferred Stock Warrants 4,265 Impact of interest rates on fair value of loans held in consolidated trusts (1,206) Interest income on cash and cash equivalents 355 Interest Expense on Term Loan (2,952) Net Income Before Income Taxes $ (9,020) Interest Income (Expense) Included in Segment Adjusted EBITDA Interest Income on Borrower Loans and Loans Held for Sale $ 29,019 $ — $ — $ 29,019 Interest Expense on Financial Instruments (21,159) — — (21,159) Total Interest Income, Net $ 7,860 $ — $ — $ 7,860

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2024
Entity Information [Line Items]
Basis of Presentation	Prosper Marketplace, Inc. (“PMI” or the “Company”) was incorporated in the state of Delaware on March 22, 2005. Except as the context requires otherwise, as used in these notes to the condensed consolidated financial statements of PMI, “Prosper,” “we,” “us,” and “our” refer to PMI and its wholly-owned subsidiaries, on a consolidated basis. The unaudited interim condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“US GAAP”) and disclosure requirements for interim financial information and the requirements of Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by US GAAP for complete financial statements. The unaudited interim condensed consolidated financial statements should be read in conjunction with the audited financial statements and notes thereto for the year ended December 31, 2023. The balance sheet at December 31, 2023 has been derived from the audited financial statements at that date. Management believes these unaudited interim condensed consolidated financial statements reflect all adjustments, consisting of a normal recurring nature, which are necessary for a fair presentation of the results for the interim periods presented. The results of operations for the interim periods are not necessarily indicative of the results that may be expected for the full year or any other interim period. PMI did not have any items of other comprehensive income or loss for any of the periods presented in the condensed consolidated financial statements as of and for the three months ended March 31, 2024 and 2023. The preparation of Prosper’s condensed consolidated financial statements and related disclosures in conformity with US GAAP requires management to make judgments, assumptions and estimates that affect the amounts reported in Prosper’s financial statements and accompanying notes. Management bases its estimates on historical experience and on various other factors it believes to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of certain assets and liabilities. These judgments, estimates and assumptions are inherently subjective in nature and actual results may differ from these estimates and assumptions. The accompanying interim condensed consolidated financial statements include the accounts of PMI, its wholly-owned subsidiaries and consolidated VIEs. All intercompany balances have been eliminated in consolidation. Notes Issued by Securitization Trust are notes held by certain third-party investors pursuant to Prosper’s securitization transactions, and are distinguishable from the borrower payment dependent Notes available to investors through the Company’s Note Channel.
Fair Value Measurements	Fair Value Measurements Financial instruments measured at fair value consist principally of Borrower Loans (Note 4), Loans Held for Sale (Note 4), Servicing Assets (Note 6), Credit Card Derivative (Note 5), Loan Trailing Fee Liabilities (Note 10), Debt (Note 11) and Convertible Preferred Stock Warrant Liability (Note 13). The estimated fair values of other financial instruments, including Cash and Cash Equivalents, Restricted Cash, Accounts Receivable, Accounts Payable and Accrued Liabilities, and Payable to Investors approximate their carrying values because of their short-term nature. The estimated fair values of the Term Loan and Warehouse Lines (Note 11) do not approximate their carrying values due primarily to differences in the stated and market rates associated with these instruments.
Restricted Cash	Restricted Cash Restricted cash consists primarily of cash deposits, money market funds and short-term certificate of deposit accounts held as collateral as required for loan funding and servicing activities, and cash that investors or Prosper have on the marketplace that has not yet been invested in Borrower Loans or disbursed to the investor.
Borrower Loans, Loans Held for Sale and Notes	Borrower Loans, Loans Held for Sale and Notes Borrower Loans are funded either through the Note Channel or through the Whole Loan Channel. Through the Note Channel, Prosper purchases Borrower Loans from WebBank, then issues Notes and holds the Borrower Loans until maturity. The obligation to repay a series of Notes issued through the Note Channel is dependent upon the repayment of the associated Borrower Loan. Borrower Loans funded and Notes issued through the Note Channel are carried on Prosper’s condensed consolidated balance sheets as assets and liabilities, respectively. Until March 2024, Prosper used Warehouse Lines to purchase Loans Held for Sale that could be subsequently contributed to securitization transactions or sold to investors. Loans Held for Sale were included in “Loans Held for Sale, at Fair Value” on the condensed consolidated balance sheets. In September 2023 and March 2024, in connection with the securitization transactions discussed below, the Loans Held for Sale in these Warehouse Lines were fully contributed to the securitization entities or purchased by Prosper, and the outstanding balances of the Warehouse Lines were fully paid down. See Note 11, Debt for more details on the termination of the Warehouse Lines. In September 2023 and March 2024, Prosper closed two separate securitization transactions, PMIT 2023-1 and PMIT 2024-1, respectively, with personal loans previously funded through its PWIIT Warehouse Line and PWIT Warehouse Line, respectively. These newly formed securitization entities issued notes acquired by third parties and residual certificates acquired by PMI (a majority owned affiliate of PFL, the sole sponsor of the securitizations). PMIT 2023-1 and PMIT 2024-1 are deemed consolidated VIEs, and as a result the Borrower Loans they hold are presented in “Borrower Loans, at Fair Value,” and the notes sold to third-party investors are included in “Notes Issued by Securitization Trust” on the accompanying condensed consolidated balance sheets. See Note 7, Securitizations , for additional disclosures related to these securitizations. Borrower Loans and Loans Held for Sale are purchased from WebBank. Prosper places Borrower Loans and Loans Held for Sale on non-accrual status when they are 120 days past due. When a loan is placed on non-accrual status, Prosper stops accruing interest and reverses all accrued but unpaid interest as of such date. Additionally, Prosper charges-off Borrower Loans and Loans Held for Sale when they are 120 days past due. The fair value of loans 120 or more days past due generally consists of the expected recovery from debt sales in subsequent periods. Prosper has elected the fair value option for Borrower Loans, Loans Held for Sale and Notes. Changes in the fair value of Borrower Loans funded through the Note Channel are largely offset by the changes in fair value of Notes due to the borrower payment-dependent design of the Notes. Changes in the fair value of Borrower Loans and Loans Held for Sale are recorded through Proper's earnings and Prosper collects interest on Borrower Loans and Loans Held for Sale. Changes in the fair values of Borrower Loans, Loans Held for Sale and Notes are included in “Change in Fair Value of Financial Instruments” on the accompanying condensed consolidated statements of operations. Prosper primarily uses a discounted cash flow model to estimate the fair value of Borrower Loans, Loans Held for Sale and Notes. The key assumptions used in the valuation include default rates and prepayment rates derived primarily from historical performance, and discount rates based on estimates of the rates of return that investors would require when investing in financial instruments with similar characteristics.
Credit Card Derivative	Credit Card Derivative The Company evaluated the terms of its Credit Card program agreement (the “Credit Card Program Agreement”) with Coastal Community Bank (“Coastal”) and determined that it contained features that met the definition of derivatives under Accounting Standards Codification (“ASC”) 815, Derivatives and Hedging . These features are freestanding financial instruments (as defined under ASC 480, Distinguishing Liabilities from Equity ), and have been valued separately as derivatives. A right of offset exists between the derivatives, and they are presented net on the accompanying consolidated balance sheets. Changes in the fair value of the Credit Card Derivative, as well as settled transactions from the Credit Card portfolio, are recorded in “Change in Fair Value of Financial Instruments” on the accompanying condensed consolidated statements of operations.
Term Loan	Term Loan Prosper entered into a Credit Agreement, which provided for a Term Loan with a third-party financial institution in November 2022, which is more fully described in Note 11, Debt . This Term Loan is carried at amortized cost, net of discounts and issuance costs, which are subsequently amortized to Interest Expense on Term Loan over the life of the underlying agreement. Interest Expense on Term Loan is presented as a component of Expenses on the accompanying condensed consolidated statements of operations, except for any portion associated with Term Loan proceeds used to purchase Loans Held for Sale through the Company’s Warehouse Lines, which is presented in “Interest Expense on Financial Instruments” as a component of Net Interest Income on the accompanying condensed consolidated statement of operations.
Leases	Leases Management determines if an arrangement is a lease at inception. Operating lease right-of-use (“ROU”) assets and operating lease liabilities are included on the Condensed Consolidated Balance Sheets in Property and Equipment, Net and in Other Liabilities, respectively. For certain leases with original terms of twelve months or less, PMI recognizes the lease expense as incurred and does not record ROU assets and lease liabilities. If a contract contains a lease, management evaluates whether it should be classified as an operating or finance lease. Operating lease ROU assets and operating lease liabilities are recognized based on the present value of the future minimum lease payments over the lease term at the commencement date. As most of PMI's leases do not provide an implicit rate, management uses an incremental borrowing rate based on the information available at commencement date in determining the present value of future payments. The operating lease ROU asset also includes any lease payments made and excludes lease incentives and initial direct costs incurred. Lease expense for minimum lease payments is recognized on a straight-line basis over the lease term. The operating lease ROU assets are evaluated for impairment utilizing the same impairment model used for Property and Equipment.
Consolidation of Variable Interest Entities	Consolidation of Variable Interest Entities The determination of whether to consolidate a VIE in which we have a variable interest requires a significant amount of analysis and judgment regarding whether we are the primary beneficiary of a VIE due to our holding a controlling financial interest in the VIE. A controlling financial interest in a VIE exists if we have both the power to direct the VIE’s activities that most significantly affect the VIE’s economic performance and a potentially significant economic interest in the VIE. The determination of whether an entity is a VIE considers factors, such as (i) whether the entity’s equity investment at risk is insufficient to allow the entity to finance its activities without additional subordinated financial support and (ii) whether a holder’s equity investment at risk lacks any of the following characteristics of a controlling financial interest: the direct or indirect ability through voting rights or similar rights to make decisions about a legal entity’s activities that have a significant effect on the entity’s success, the obligation to absorb the expected losses of the entity or the right to receive the expected residual returns of the legal entity. Management regularly reviews and reconsiders its previous conclusions regarding the status of an entity as a VIE and whether we are required to consolidate or deconsolidate such VIE in the consolidated financial statements.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Accounting Standards Issued, to be Adopted by the Company in Future Periods In March 2020, the FASB issued Accounting Standards Update (“ASU”) No. 2020-04, “Reference Rate Reform (Topic 848),” which provides optional expedients and exceptions for applying GAAP on contract modifications and hedge accounting, in order to ease the financial reporting burdens of the expected market transition from LIBOR and other interbank offered rates to alternative referenced rates, such as the Secured Overnight Financing Rate. The optional guidance, which became effective on March 12, 2020, could be applied through December 31, 2022. In December 2022, the FASB issued No 2022-06 extending the sunset date of the relief provided under ASU No. 2020-04 to December 31, 2024. The Company amended its agreements and transitioned to SOFR for contracts that previously referenced LIBOR. The Company continues to evaluate potential future impacts that may result from the discontinuation of LIBOR or other reference rates as well as the accounting provided in this update on our financial condition, results of operations, and cash flows . In October 2023, the FASB issued ASU No. 2023-06, “Disclosure Improvements: Codification Amendments in Response to the Securities and Exchange Commission’s Disclosure Update and Simplification Initiative”. The amendments in this update modify the disclosure or presentation requirements of a variety of Topics in the ASC in response to the SEC’s Release No. 33-10532, “Disclosure Update and Simplification Initiative”, and align the ASC’s requirements with the SEC’s regulations. The effective date for each amendment will be the date on which the SEC's removal of that related disclosure from Regulation S-X or Regulation S-K becomes effective. However, if by June 30, 2027, the SEC has not removed the related disclosure from its regulations, the amendments will be removed from the Codification and not become effective. Early adoption is prohibited. The Company does not expect the adoption of this ASU to have a material impact on the Company’s condensed consolidated financial statements and related disclosures. In November 2023, the FASB issued ASU No. 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures”, which updates reportable segment disclosure requirements primarily through enhanced disclosures about significant segment expenses. The amendments are effective for fiscal years beginning after December 15, 2023, and for interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. The amendments should be applied retrospectively to all prior periods presented in the financial statements. The Company is currently evaluating this ASU to determine its impact on the Company’s disclosures. In December 2023, the FASB issued ASU No. 2023-09, “I ncome Taxes (Topic 740): Improvements to Income Tax Disclosures”, which enhances effective tax rate reconciliation disclosure requirements and provides clarity to the disclosures of income taxes paid, income before taxes and provision for income taxes. The amendments are effective for fiscal years beginning after December 15, 2024. Early adoption is permitted for annual financial statements that have not yet been issued or made available for issuance. The amendments in this update should be applied on a prospective basis. Retrospective application is permitted. The Company is currently evaluating this ASU to determine its impact on the Company’s disclosures. Other recent accounting pronouncements issued by the FASB did not, or are not believed by management to, have a material impact on the Company’s present or future financial statements.
Prosper Funding LLC
Entity Information [Line Items]
Basis of Presentation	Prosper Funding LLC (“PFL”) was formed in the state of Delaware in February 2012 as a limited liability company with Prosper Marketplace, Inc. (“PMI”) as its sole equity member. Except as the context otherwise requires, as used in these Notes to the condensed consolidated financial statements of Prosper Funding LLC, “PFL,” and the “Company” refers to Prosper Funding LLC and its wholly owned subsidiary, Prosper Depositor LLC, a Delaware limited liability company, on a consolidated basis. The unaudited interim condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“US GAAP”) and disclosure requirements for interim financial information and the requirements of Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by US GAAP for complete financial statements. The unaudited interim condensed consolidated financial statements should be read in conjunction with the audited financial statements and notes thereto for the year ended December 31, 2023. The balance sheet at December 31, 2023 has been derived from the audited financial statements at that date. Management believes these unaudited interim condensed consolidated financial statements reflect all adjustments, consisting of a normal recurring nature, which are necessary for a fair presentation of the results for the interim periods presented. The results of operations for the interim periods are not necessarily indicative of the results that may be expected for the full year or any other interim period. PFL did not have any items of other comprehensive income or loss for any of the periods presented in the condensed consolidated financial statements as of and for the three months ended March 31, 2024 and 2023. The preparation of PFL's condensed consolidated financial statements and related disclosures in conformity with US GAAP requires management to make judgments, assumptions and estimates that affect the amounts reported in its condensed consolidated financial statements and accompanying notes. Management bases its estimates on historical experience and on various other factors it believes to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of certain assets and liabilities. These judgments, estimates and assumptions are inherently subjective in nature and actual results may differ from these estimates and assumptions, and the differences could be material.
Fair Value Measurements	Fair Value Measurements Financial instruments consist principally of Cash and Cash Equivalents, Restricted Cash, Borrower Loans, Loans Held for Sale, Accounts Receivable, Accounts Payable and Accrued Liabilities, Payable to Investors and Notes. The estimated fair values of Cash and Cash Equivalents, Restricted Cash, Accounts Receivable, Accounts Payable and Accrued Liabilities, and Payable to Investors approximate their carrying values because of their short-term nature.
Restricted Cash	Restricted Cash Restricted Cash consists primarily of cash deposits, money market funds and short-term certificate of deposit accounts held as collateral as required for long term leases, loan funding and servicing activities, and cash that investors have on our marketplace that has not yet been invested in Borrower Loans or disbursed to the investor.
Borrower Loans, Loans Held for Sale and Notes	Borrower Loans, Loans Held for Sale and Notes With respect to the Note Channel, PFL purchases Borrower Loans from WebBank, then issues Notes and holds the Borrower Loans until maturity. The obligation to repay a series of Notes funded through the Note Channel is dependent upon the repayment of the associated Borrower Loan. Borrower Loans and Notes funded through the Note Channel are carried on PFL’s condensed consolidated balance sheets as assets and liabilities, respectively. PFL places Borrower Loans and Loans Held for Sale on non-accrual status when they are 120 days past due. When a loan is placed on non-accrual status, PFL stops accruing interest and reverses all accrued but unpaid interest as of such date. Additionally, PFL charges-off Borrower Loans and Loans Held for Sale when they are 120 days past due. The fair value of loans 120 days past due generally consists of the expected recovery from debt sales in subsequent periods. Management has elected the fair value option for Borrower Loans, Loans Held for Sale, and Notes. Changes in fair value of Borrower Loans are largely offset by the changes in fair value of Notes due to the borrower payment-dependent design of the Notes. Changes in fair value of Borrower Loans, Loans Held for Sale and Notes are included in “Change in Fair Value of Financial Instruments, Net” on the condensed consolidated statements of operations. PFL primarily uses a discounted cash flow model to estimate the fair value of Borrower Loans, Loans Held for Sale and Notes. The key assumptions used in the valuation include default rates and prepayment rates derived primarily from historical performance and discount rates based on estimates of the rates of return that investors would require when investing in financial instruments with similar characteristics.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Accounting Standards Adopted In The Current Period No accounting standards were adopted in the current period for PFL. Accounting Standards Issued, To Be Adopted By PFL In Future Periods No issued and pending accounting standards were identified that are expected to have an impact on PFL.

Property and Equipment, Net (Ta

Property and Equipment, Net (Tables)	3 Months Ended
	Mar. 31, 2024
Entity Information [Line Items]
Schedule of Property and Equipment	Property and Equipment consists of the following at the dates presented (in thousands): March 31, 2024 December 31, 2023 Internal-use software and website development costs $ 58,669 $ 58,423 Operating lease right-of-use assets 22,690 22,655 Computer equipment 10,489 10,466 Leasehold improvements 7,144 6,827 Office equipment and furniture 2,968 2,936 Assets not yet placed in service 12,552 9,953 Property and equipment 114,512 111,260 Less: Accumulated depreciation and amortization (72,777) (70,371) Total Property and Equipment, Net $ 41,735 $ 40,889
Prosper Funding LLC
Entity Information [Line Items]
Schedule of Property and Equipment	Property and equipment consist of the following as of the dates presented (in thousands): March 31, 2024 December 31, 2023 Internal-use software and web site development costs $ 43,642 $ 43,619 Less: accumulated depreciation and amortization (32,751) (31,978) Total property and equipment, net $ 10,891 $ 11,641

Borrower Loans, Loans Held fo_2

Borrower Loans, Loans Held for Sale and Notes, at Fair Value (Tables)	3 Months Ended
	Mar. 31, 2024
Entity Information [Line Items]
Schedule of Borrower Loans, Notes and Loans Held for Sale	The aggregate principal balances outstanding and fair values of Borrower Loans, Loans Held for Sale, and Notes as of March 31, 2024 and December 31, 2023, are presented in the following table (in thousands): Borrower Loans Loans Held for Sale Notes March 31, 2024 December 31, 2023 March 31, 2024 December 31, 2023 March 31, 2024 December 31, 2023 Aggregate principal balance and interest outstanding $ 675,349 $ 577,029 $ — $ 170,925 $ 334,139 $ 345,341 Fair value adjustments (31,149) (31,991) — (9,424) (17,561) (23,375) Fair value $ 644,200 $ 545,038 $ — $ 161,501 $ 316,578 $ 321,966
Prosper Funding LLC
Entity Information [Line Items]
Schedule of Borrower Loans, Notes and Loans Held for Sale	The aggregate principal balances outstanding and fair values of Borrower Loans and Notes as of March 31, 2024 and December 31, 2023, are presented in the following table (in thousands): Borrower Loans Notes March 31, 2024 December 31, 2023 March 31, 2024 December 31, 2023 Aggregate principal balance outstanding and interest outstanding $ 338,310 $ 342,791 $ 334,139 $ 345,341 Fair value adjustments (15,869) (18,480) (17,561) (23,375) Fair value $ 322,441 $ 324,311 $ 316,578 $ 321,966

Fair Value of Assets and Liab_2

Fair Value of Assets and Liabilities (Tables)	3 Months Ended
	Mar. 31, 2024
Entity Information [Line Items]
Schedule of Fair Value Hierarchy for Assets and Liabilities Measured at Fair Value	The following tables present the fair value hierarchy for assets and liabilities measured at fair value (in thousands): March 31, 2024 Level 1 Inputs Level 2 Inputs Level 3 Inputs Total Assets: Borrower Loans, at Fair Value — — 644,200 644,200 Servicing Assets — — 12,536 12,536 Credit Card Derivative (Note 5) — — 45,917 45,917 Total Assets $ — $ — $ 702,653 $ 702,653 Liabilities: Notes, at Fair Value $ — $ — $ 316,578 $ 316,578 Convertible Preferred Stock Warrant Liability — — 187,317 187,317 Loan Trailing Fee Liability (Note 10) — — 2,938 2,938 Credit Card servicing obligation liability (Note 5) — — 8,836 8,836 Total Liabilities $ — $ — $ 515,669 $ 515,669 December 31, 2023 Level 1 Inputs Level 2 Inputs Level 3 Inputs Total Assets: Loans Held for Sale at Fair Value $ — $ — $ 161,501 $ 161,501 Borrower Loans, at Fair Value — — 545,038 545,038 SOFR rate swaption (Note 11) — 90 — 90 Servicing Assets — — 12,249 12,249 Credit Card Derivative (Note 5) $ — $ — 36,848 36,848 Total Assets $ — $ 90 $ 755,636 $ 755,726 Liabilities: Notes, at Fair Value $ — $ — $ 321,966 $ 321,966 Convertible Preferred Stock Warrant Liability — — 215,041 215,041 Loan Trailing Fee Liability (Note 10) — — 2,942 2,942 Credit Card servicing obligation liability (Note 5) $ — $ — 9,732 9,732 Total Liabilities $ — $ — $ 549,681 $ 549,681
Schedule of Quantitative Information About Significant Unobservable Inputs	The following tables present quantitative information about the ranges of significant unobservable inputs used for the Company’s Level 3 fair value measurements at March 31, 2024 and December 31, 2023: Range Borrower Loans, Loans Held for Sale and Notes: March 31, 2024 December 31, 2023 Discount rate 5.4% - 11.1% 5.4% - 8.1% Default rate 2.9% - 24.3% 3.2% - 23.6% Range Servicing Assets: March 31, 2024 December 31, 2023 Discount rate 15.0% - 25.0% 15.0% - 25.0% Default rate 2.5% - 24.4% 2.8% - 23.6% Prepayment rate 6.2% - 30.5% 6.1% - 30.6% Market servicing rate (1) (2) 0.633% - 0.842% 0.633% - 0.842% (1) Servicing assets associated with loans enrolled in a relief program offered by the Company as of March 31, 2024 and December 31, 2023 were measured using a market servicing rate assumptio n of 84.2 basis points. This rate was estimated using a multiplier consistent with observable market rates for other loan types, applied to the base market servicing rate assumption. (2) Excludes collection fees that would be passed on to a hypothetical third-party servicer. As of March 31, 2024 and December 31, 2023, the market rate for collection fees and non-sufficient fund fees was assumed to be 6 basis points and 5 basis points, respectively, for a total market servicing rate range of 69.3 - 90.2 basis points and 68.3 - 89.2 basis points, respectively. Range Loan Trailing Fee Liability: March 31, 2024 December 31, 2023 Discount rate 15.0% - 25.0% 15.0% - 25.0% Default rate 2.5% - 24.4% 2.8% - 23.6% Prepayment rate 6.2% - 30.5% 6.1% - 30.6%
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis	The following tables present additional information about Level 3 Borrower Loans, Loans Held for Sale and Notes measured at fair value on a recurring basis (in thousands): Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Assets Liabilities Borrower Loans Loans Held For Sale Notes Total Balance at January 1, 2024 $ 545,038 $ 161,501 $ (321,966) $ 384,573 Purchase of Borrower Loans/Issuance of Notes 51,854 487,830 (49,589) 490,095 Principal repayments (77,762) (22,554) 49,806 (50,510) Borrower Loans sold to third parties (1,490) (488,522) — (490,012) Other changes (310) (303) 300 (313) Change in fair value (8,819) (2,263) 4,871 (6,211) Transfer of Loans Held for Sale to Borrower Loans upon PMIT 2024-1 Transaction, at Fair Value 135,689 (135,689) — — Balance at March 31, 2024 $ 644,200 $ — $ (316,578) $ 327,622 Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Assets Liabilities Borrower Loans Loans Held for Sale Notes Total Balance at January 1, 2023 $ 320,642 $ 499,765 $ (318,704) $ 501,703 Purchase of Borrower Loans/Issuance of Notes 63,909 569,802 (62,643) 571,068 Principal repayments (45,487) (63,501) 46,283 (62,705) Borrower Loans sold to third parties (953) (444,268) — (445,221) Other changes 105 762 (51) 816 Change in fair value (7,809) (9,465) 7,429 (9,845) Balance at March 31, 2023 $ 330,407 $ 553,095 $ (327,686) $ 555,816
Schedule of Servicing Assets and Liabilities Measured at Fair Value	The following tables present additional information about Level 3 Servicing Assets measured at fair value on a recurring basis for the three month periods ending March 31, 2024 and 2023 (in thousands): Servicing Assets Balance at January 1, 2024 $ 12,249 Additions 2,504 Less: Changes in fair value (2,217) Balance at March 31, 2024 $ 12,536 Servicing Assets Balance at January 1, 2023 $ 12,562 Additions 2,313 Less: Changes in fair value (2,159) Balance at March 31, 2023 $ 12,716 The following tables present additional information about the Level 3 Credit Card derivative measured at fair value on a recurring basis for the three month periods ending March 31, 2024 and 2023 (in thousands): Credit Card Derivative Balance at January 1, 2024 $ 36,848 Change in fair value 9,069 Balance at March 31, 2024 $ 45,917 Credit Card Derivative Balance at January 1, 2023 $ 10,782 Change in fair value 6,101 Balance at March 31, 2023 $ 16,883 The following tables present additional information ab out the Level 3 Credit Card servicing obligation liability (a component of “Other Liabilities” on the consolidated balance sheets) measured at fair value on a recurring basis for the three month periods ending March 31, 2024 and 2023 (in thousands): Credit Card Servicing Obligation Liability Fair Value at January 1, 2024 $ 9,732 Change in fair value (896) Balance at March 31, 2024 $ 8,836 Credit Card Servicing Obligation Liability Fair Value at January 1, 2023 $ 3,720 Change in fair value 906 Balance at March 31, 2023 $ 4,626 The following tables present additional information about the Level 3 Convertible Preferred Stock Warrant Liability measured at fair value on a recurring basis for the three month periods ending March 31, 2024 and 2023 (in thousands): Convertible Preferred Stock Warrant Liability Balance as of January 1, 2024 $ 215,041 Change in fair value (27,724) Balance as of March 31, 2024 $ 187,317 Convertible Preferred Stock Warrant Liability Balance as of January 1, 2023 $ 166,346 Change in fair value (4,265) Balance as of March 31, 2023 $ 162,081
Schedule of Level 3 Liabilities Measured on Recurring Basis	The following tables present additional information about the Level 3 Loan Trailing Fee Liability measured at fair value on a recurring basis for the three month periods ending March 31, 2024 and 2023 (in thousands): Loan Trailing Fee Liability Balance at January 1, 2024 $ 2,942 Issuances 488 Cash Payment of Loan Trailing Fee (660) Change in Fair Value 168 Balance at March 31, 2024 $ 2,938 Loan Trailing Fee Liability Balance at January 1, 2023 $ 3,290 Issuances 589 Cash Payment of Loan Trailing Fee (708) Change in Fair Value 137 Balance at March 31, 2023 $ 3,308
Schedule of Fair Value Assumptions	Key economic assumptions and the sensitivity of the fair value to immediate changes in those assumptions at March 31, 2024 and December 31, 2023 for Borrower Loans and Loans Held for Sale are presented in the following table (in thousands, except percentages). Borrower Loans and Loans Held for Sale March 31, 2024 December 31, 2023 Fair value, using the following assumptions: $ 644,200 $ 706,539 Weighted-average discount rate 7.59 % 6.88 % Weighted-average default rate 11.41 % 12.44 % Fair value resulting from: 100 basis point increase in discount rate $ 638,091 $ 699,770 200 basis point increase in discount rate $ 632,130 $ 693,167 Fair value resulting from: 100 basis point decrease in discount rate $ 650,462 $ 713,481 200 basis point decrease in discount rate $ 656,884 $ 720,601 Fair value resulting from: Applying a 1.1 multiplier to default rate $ 636,336 $ 696,510 Applying a 1.2 multiplier to default rate $ 628,517 $ 686,586 Fair value resulting from: Applying a 0.9 multiplier to default rate $ 652,106 $ 716,671 Applying a 0.8 multiplier to default rate $ 660,058 $ 726,910 Key economic assumptions and the sensitivity of the fair value to immediate changes in those assumptions at March 31, 2024 and December 31, 2023 for Notes are presented in the following table (in thousands, except percentages). Notes March 31, 2024 December 31, 2023 Fair value, using the following assumptions: $ 316,578 $ 321,966 Weighted-average discount rate 7.31 % 6.55 % Weighted-average default rate 13.03 % 14.21 % Fair value resulting from: 100 basis point increase in discount rate $ 313,572 $ 318,877 200 basis point increase in discount rate $ 310,638 $ 315,863 Fair value resulting from: 100 basis point decrease in discount rate $ 319,660 $ 325,134 200 basis point decrease in discount rate $ 322,820 $ 328,384 Fair value resulting from: Applying a 1.1 multiplier to default rate $ 312,678 $ 317,359 Applying a 1.2 multiplier to default rate $ 308,800 $ 312,800 Fair value resulting from: Applying a 0.9 multiplier to default rate $ 320,499 $ 326,621 Applying a 0.8 multiplier to default rate $ 324,443 $ 331,325
Schedule of Estimated Fair Value of Sensitivity Assets and Liabilities	Key economic assumptions and the sensitivity of the fair value to immediate changes in those assumptions at March 31, 2024 and December 31, 2023 for Servicing Assets is presented in the following table (in thousands, except percentages). Servicing Assets March 31, 2024 December 31, 2023 Fair value, using the following assumptions $ 12,536 $ 12,249 Weighted-average market servicing rate 0.65 % 0.65 % Weighted-average prepayment rate 19.41 % 19.55 % Weighted-average default rate 13.93 % 15.25 % Fair value resulting from: Market servicing rate increase of 0.025% $ 11,737 $ 11,475 Market servicing rate decrease of 0.025% $ 13,335 $ 13,023 Fair value resulting from: Applying a 1.1 multiplier to prepayment rate $ 12,250 $ 11,969 Applying a 0.9 multiplier to prepayment rate $ 12,827 $ 12,533 Fair value resulting from: Applying a 1.1 multiplier to default rate $ 12,280 $ 11,998 Applying a 0.9 multiplier to default rate $ 12,794 $ 12,503 Key economic assumptions and the sensitivity of the fair value to immediate changes in those assumptions at March 31, 2024 and December 31, 2023 for Credit Card servicing obligation liability is presented in the following table (in thousands, except percentages). Credit Card servicing obligation liability: March 31, 2024 December 31, 2023 Fair value, using the following assumptions: $ 8,836 $ 9,732 Discount rate on Credit Card portfolio servicing obligation (1) 23.53 % 7.41 % Prepayment rate applied to Credit Card portfolio 8.64 % 8.14 % Default rate applied to Credit Card portfolio 15.26 % 14.36 % Market servicing rate 2.00 % 2.00 % Fair value resulting from: Market servicing rate increase of 0.10% $ 9,294 $ 10,253 Market servicing rate decrease of 0.10% $ 8,377 $ 9,213 Fair value resulting from: Applying a 1.1 multiplier to prepayment rate $ 8,733 $ 9,609 Applying a 0.9 multiplier to prepayment rate $ 8,939 $ 9,858 Fair value resulting from: Applying a 1.1 multiplier to default rate $ 8,628 $ 9,487 Applying a 0.9 multiplier to default rate $ 9,047 $ 9,984 (1) Refer to Change in Estimate section below.
Schedule of Derivative Assets Measured at Fair Value	Key economic assumptions and the sensitivity of the fair value to immediate changes in those assumptions at March 31, 2024 and December 31, 2023 for the Credit Card Derivative is presented in the following table (in thousands, except percentages). Credit Card Derivative March 31, 2024 December 31, 2023 Fair value, based on the following notional amount and rate assumptions: $ 45,917 $ 36,848 Prosper Credit Card portfolio 315,324 286,284 Discount rate on Prosper Allocations 23.53 % 23.19 % Discount rate on Coastal Program Fee (1) 23.53 % 7.41 % Prepayment rate applied to Credit Card portfolio 8.64 % 8.14 % Default rate applied to Credit Card portfolio 15.26 % 14.36 % Fair value resulting from: 100 basis point increase in both discount rates $ 45,306 $ 36,452 200 basis point increase in both discount rates $ 44,712 $ 36,065 Fair value resulting from: 100 basis point decrease in both discount rates $ 46,547 $ 37,253 200 basis point decrease in both discount rates $ 47,195 $ 37,668 Fair value resulting from: Applying a 1.1 multiplier to prepayment rate $ 45,244 $ 36,374 Applying a 0.9 multiplier to prepayment rate $ 46,600 $ 37,328 Fair value resulting from: Applying a 1.1 multiplier to default rate $ 36,645 $ 29,659 Applying a 0.9 multiplier to default rate $ 55,499 $ 44,256 (1) Refer to Change in Estimate section below.
Schedule of Financial Instruments, Assets And Liabilities Not Recorded at Fair Value	The following table presents the fair value hierarchy for assets, and liabilities not recorded at fair value (in thousands): March 31, 2024 Carrying Amount Level 1 Inputs Level 2 Inputs Level 3 Inputs Balance at Fair Value Assets: Cash and Cash Equivalents $ 30,297 $ 30,297 $ — $ — $ 30,297 Restricted Cash - Cash and Cash Equivalents 105,878 105,878 — — 105,878 Restricted Cash - Certificates of Deposit 3,028 — 3,028 — 3,028 Accounts Receivable 7,754 — 7,754 — 7,754 Total Assets $ 146,957 $ 136,175 $ 10,782 $ — $ 146,957 Liabilities: Accounts Payable and Accrued Liabilities $ 52,375 $ — $ 52,375 $ — $ 52,375 Payable to Investors 76,063 — 76,063 — 76,063 Notes Issued by Securitization Trust 319,159 — 320,358 — 320,358 Term Loan (Note 11) 75,827 — 78,259 — 78,259 Total Liabilities $ 523,424 $ — $ 527,055 $ — $ 527,055 December 31, 2023 Carrying Amount Level 1 Inputs Level 2 Inputs Level 3 Inputs Balance at Fair Value Assets: Cash and Cash Equivalents $ 34,970 $ 34,970 $ — $ — $ 34,970 Restricted Cash - Cash and Cash Equivalents 117,270 117,270 — — 117,270 Restricted Cash - Certificates of Deposit 3,028 — 3,028 — 3,028 Accounts Receivable 7,523 — 7,523 — 7,523 Total Assets $ 162,791 $ 152,240 $ 10,551 $ — $ 162,791 Liabilities: Accounts Payable and Accrued Liabilities $ 40,906 $ — $ 40,906 $ — $ 40,906 Payable to Investors 86,732 — 86,732 — 86,732 Notes Issued by Securitization Trust 214,798 — 208,005 — 208,005 Warehouse Lines 160,207 — 157,972 — 157,972 Term Loan (Note 11) 75,313 — 77,837 — 77,837 Total Liabilities $ 577,956 $ — $ 571,452 $ — $ 571,452
Prosper Funding LLC
Entity Information [Line Items]
Schedule of Fair Value Hierarchy for Assets and Liabilities Measured at Fair Value	The following tables present the fair value hierarchy for assets and liabilities measured at fair value (in thousands): March 31, 2024 Level 1 Inputs Level 2 Inputs Level 3 Inputs Total Assets: Borrower Loans, at Fair Value $ — $ — $ 322,441 $ 322,441 Servicing Assets — — 13,785 13,785 Total Assets $ — $ — $ 336,226 $ 336,226 Liabilities: Notes, at Fair Value $ — $ — $ 316,578 $ 316,578 Loan Trailing Fee Liability — — 2,938 2,938 Total Liabilities $ — $ — $ 319,516 $ 319,516 December 31, 2023 Level 1 Inputs Level 2 Inputs Level 3 Inputs Total Assets: Borrower Loans, at Fair Value $ — $ — $ 324,311 $ 324,311 Servicing Assets — — 13,818 13,818 Total Assets $ — $ — $ 338,129 $ 338,129 Liabilities: Notes, at Fair Value $ — $ — $ 321,966 $ 321,966 Loan Trailing Fee Liability — — 2,942 2,942 Total Liabilities $ — $ — $ 324,908 $ 324,908
Schedule of Quantitative Information About Significant Unobservable Inputs	The following tables present quantitative information about the significant unobservable inputs used for PFL’s Level 3 fair value measurements at the dates presented: Range Borrower Loans and Notes March 31, 2024 December 31, 2023 Discount rate 5.5% - 8.9% 5.5% - 8% Default rate 2.9% - 24.0% 3.2% - 23.6% Range Servicing Assets March 31, 2024 December 31, 2023 Discount rate 15.0% - 25.0% 15.0% - 25.0% Default rate 2.5% - 24.4% 2.8% - 23.6% Prepayment rate 6.2% - 31.7% 6.1% - 30.6% Market servicing rate (1) (2) 0.633% - 0.842% 0.633% - 0.842% (1) Servicing assets associated with loa ns enrolled in a relief program offered by the Company as of March 31, 2024 and December 31, 2023 were measured using a market servicing rate assumption of 84.2 basis points. This rate was estimated using a multiplier consistent with observable market rates for other loan types, applied to the base market servicing rate assumption . (2 ) Excludes collection fees that would be passed on to a hypothetical third-party servicer. As of March 31, 2024 and December 31, 2023, the market rate for collection fees and non-sufficient fund fees was assumed to be 6 basis points and 5 basis points, respectively, for a total market servicing rate range of 69.3 - 90.2 basis points and a total market servicing rate of 68.3 - 89.2 basis points, respectively. Range Loan Trailing Fee Liability March 31, 2024 December 31, 2023 Discount rate 15.0% - 25.0% 15.0% - 25.0% Default rate 2.5% - 24.4% 2.8% - 23.6% Prepayment rate 6.2% - 31.7% 6.1% - 30.6%
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis	The following tables present additional information about Level 3 Borrower Loans, Loans Held for Sale and Notes measured at fair value on a recurring basis (in thousands): Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Assets Liabilities Borrower Loans Loans Held for Sale Notes Total Balance at January 1, 2024 $ 324,311 $ — $ (321,966) $ 2,345 Originations 51,854 487,830 (49,589) 490,095 Borrower Loans contributed by Parent, at Fair Value 1,634 — — 1,634 Principal repayments (48,124) — 49,806 1,682 Borrower Loans sold to third parties (1,490) (487,830) — (489,320) Other changes (186) — 299 113 Change in fair value (5,558) — 4,872 (686) Balance at March 31, 2024 $ 322,441 $ — $ (316,578) $ 5,863 Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Assets Liabilities Borrower Loans Loans Held for Sale Notes Total Balance at January 1, 2023 $ 320,642 $ — $ (318,704) $ 1,938 Originations 63,909 569,802 (62,643) 571,068 Principal repayments (45,487) — 46,283 796 Borrower Loans sold to third parties (953) (569,802) — (570,755) Other changes 105 — (51) 54 Change in fair value (7,809) — 7,429 (380) Balance at March 31, 2023 $ 330,407 $ — $ (327,686) $ 2,721
Schedule of Servicing Assets and Liabilities Measured at Fair Value	The following tables present additional information about Level 3 Servicing Assets recorded at fair value (in thousands): Servicing Assets Balance as of January 1, 2024 $ 13,818 Additions 2,503 Less: Changes in fair value (2,536) Balance as of March 31, 2024 $ 13,785 Servicing Assets Balance as of January 1, 2023 $ 14,860 Additions 2,939 Less: Changes in fair value (2,550) Balance as of March 31, 2023 $ 15,249 Loan Trailing Fee Liability The fair value of the Loan Trailing Fee Liability represents the present value of the expected monthly Loan Trailing Fee payments, which takes into consideration certain assumptions related to expected prepayment rates and default rates using a discounted cash flow model. The assumptions used are the same as those used for the valuation of Servicing Assets, as described below. The following tables present additional information about Level 3 Loan Trailing Fee Liability measured at fair value on a recurring basis (in thousands): Loan Trailing Fee Liability Balance as of January 1, 2024 $ 2,942 Issuances 488 Cash payment of Loan Trailing Fee (660) Change in fair value 168 Balance as of March 31, 2024 $ 2,938 Loan Trailing Fee Liability Balance as of January 1, 2023 $ 3,290 Issuances 589 Cash payment of Loan Trailing Fee (708) Change in fair value 137 Balance as of March 31, 2023 $ 3,308
Schedule of Fair Value Assumptions	Key economic assumptions are used to compute the fair value of Borrower Loans. The sensitivity of the fair value to immediate changes in assumptions at March 31, 2024 and December 31, 2023 for Borrower Loans are presented in the following table (in thousands, except percentages). Borrower Loans: March 31, 2024 December 31, 2023 Fair value, using the following assumptions: $ 322,441 $ 324,311 Weighted-average discount rate 7.32 % 6.55 % Weighted-average default rate 13.29 % 14.36 % Fair value resulting from: 100 basis point increase in discount rate $ 319,385 $ 321,204 200 basis point increase in discount rate $ 316,401 $ 318,174 Fair value resulting from: 100 basis point decrease in discount rate $ 325,577 $ 327,498 200 basis point decrease in discount rate $ 328,791 $ 330,766 Fair value resulting from: Applying a 1.1 multiplier to default rate $ 318,506 $ 319,708 Applying a 1.2 multiplier to default rate $ 314,593 $ 315,153 Fair value resulting from: Applying a 0.9 multiplier to default rate $ 326,399 $ 328,962 Applying a 0.8 multiplier to default rate $ 330,380 $ 333,662 Key economic assumptions are used to compute the fair value of Notes. The sensitivity of the fair value to immediate changes in assumptions at March 31, 2024 and December 31, 2023 for Notes funded through the Note Channel are presented in the following table (in thousands, except percentages). Notes March 31, 2024 December 31, 2023 Fair value, using the following assumptions: $ 316,578 $ 321,966 Weighted-average discount rate 7.31 % 6.55 % Weighted-average default rate 13.03 % 14.21 % Fair value resulting from: 100 basis point increase in discount rate $ 313,572 $ 318,877 200 basis point increase in discount rate $ 310,638 $ 315,863 Fair value resulting from: 100 basis point decrease in discount rate $ 319,660 $ 325,134 200 basis point decrease in discount rate $ 322,820 $ 328,384 Fair value resulting from: Applying a 1.1 multiplier to default rate $ 312,678 $ 317,359 Applying a 1.2 multiplier to default rate $ 308,800 $ 312,800 Fair value resulting from: Applying a 0.9 multiplier to default rate $ 320,499 $ 326,621 Applying a 0.8 multiplier to default rate $ 324,443 $ 331,325
Schedule of Estimated Fair Value of Sensitivity Assets and Liabilities	Key economic assumptions are used to compute the fair value of Servicing Assets. The sensitivity of the current fair value to immediate changes in assumptions at March 31, 2024 and December 31, 2023 for Servicing Assets are presented in the following table (in thousands, except percentages). Servicing Assets March 31, 2024 December 31, 2023 Fair value, using the following assumptions: $ 13,785 $ 13,818 Weighted-average market servicing rate 0.65 % 0.65 % Weighted-average prepayment rate 19.78 % 19.96 % Weighted-average default rate 13.51 % 14.74 % Fair value resulting from: Market servicing rate increase of 0.025% $ 12,907 $ 12,945 Market servicing rate decrease of 0.025% $ 14,664 $ 14,691 Fair value resulting from: Applying a 1.1 multiplier to prepayment rate $ 13,471 $ 13,502 Applying a 0.9 multiplier to prepayment rate $ 14,105 $ 14,139 Fair value resulting from: Applying a 1.1 multiplier to default rate $ 13,503 $ 13,534 Applying a 0.9 multiplier to default rate $ 14,069 $ 14,104

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets, Net (Tables)	3 Months Ended
	Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Other Intangible Assets for the Period Presented	The following table presents the detail of other intangible assets subject to amortization as of the following date (dollars in thousands): March 31, 2024 Gross Carrying Value Accumulated Amortization Net Carrying Value Remaining Useful Life (In Years) Developed technology $ 3,060 $ (3,060) $ — — User base and customer relationships 5,050 (4,986) 64 1.1 Brand name 60 (60) — — Total Intangible Assets subject to amortization $ 8,170 $ (8,106) $ 64

Other Liabilities (Tables)

Other Liabilities (Tables)	3 Months Ended
	Mar. 31, 2024
Other Liabilities [Abstract]
Schedule of Other Liabilities	Other Liabilities consist of the following (in thousands): March 31, 2024 December 31, 2023 Operating lease liabilities (Note 16) $ 14,053 $ 14,431 Credit Card servicing obligation liability (Note 5) 8,836 9,732 Deferred revenue 6,652 6,373 Loan trailing fee liability 2,938 2,942 Deferred income tax liability 721 721 Other 828 1,060 Total Other Liabilities $ 34,028 $ 35,259

Net Income (Loss) Per Share (Ta

Net Income (Loss) Per Share (Tables)	3 Months Ended
	Mar. 31, 2024
Earnings Per Share [Abstract]
Schedule of Basic and Diluted Net Income (Loss) Per Share	Basic and diluted net income (loss) per share were calculated as follows for the periods presented (in thousands, except share and per share amounts): Three Months Ended March 31, 2024 2023 Numerator: Net Income (Loss) $ 22,295 $ (9,090) Less: Net Income Allocated to Participating Securities (14,707) — Net Income (Loss) Attributable to Common Stockholders $ 7,588 $ (9,090) Denominator: Weighted average shares used in computing basic net income (loss) per share 77,070,847 75,187,033 Effect of dilutive securities: Stock options 48,443,891 — Warrants 391,431 — Convertible preferred stock warrants 213,264,845 — Weighted-average shares used in computing diluted net income (loss) per share 339,171,014 75,187,033 Net Income (Loss) Per Share – Basic $ 0.10 $ (0.12) Net Income (Loss) Per Share – Diluted $ 0.02 $ (0.12)
Schedule of Dilutive Shares Excluded from the Diluted Net Income (Loss) Per Share Calculation	The following common stock equivalents were excluded from the computation of diluted net income (loss) per share for the periods presented because including them would have been anti-dilutive: Three Months Ended March 31, 2024 2023 (shares) (shares) Excluded securities: Convertible preferred stock issued and outstanding, excluding shares held by consolidated VIE 158,365,655 158,365,655 Stock options issued and outstanding 32,923,114 78,133,890 Warrants issued and outstanding 688,918 1,080,349 Series E-1 convertible preferred stock warrants — 35,544,141 Series F convertible preferred stock warrants — 177,720,704 Total common stock equivalents excluded from diluted net income (loss) per common share computation 191,977,687 450,844,739

Convertible Preferred Stock, _2

Convertible Preferred Stock, Convertible Preferred Stock Warrant Liability and Common Stock (Tables)	3 Months Ended
	Mar. 31, 2024
Stockholders' Equity Note [Abstract]
Schedule of Shares Authorized, Issued, Outstanding, Par Value and Liquidation Preference of Convertible Preferred Stock	The number of authorized, issued and outstanding shares, their par value and liquidation preference for each series of convertible preferred stock as of March 31, 2024 are disclosed in the table below (amounts in thousands except share and par value amounts): Convertible Preferred Stock Par Value Authorized Shares Outstanding and Issued Shares Liquidation Preference, Outstanding Shares Series A $ 0.01 68,558,220 66,428,185 * $ 19,160 Series A-1 $ 0.01 24,760,915 22,515,315 45,031 Series B $ 0.01 35,775,880 35,127,160 * 21,190 Series C $ 0.01 24,404,770 24,404,770 70,075 Series D $ 0.01 23,888,640 23,888,640 165,000 Series E-1 $ 0.01 35,544,141 — — Series E-2 $ 0.01 16,858,078 — — Series F $ 0.01 177,720,707 3 — Series G $ 0.01 37,249,497 37,249,497 50,000 Total 444,760,848 209,613,570 $ 370,456 * Series A and Series B Convertible Preferred Stock totals are inclusive of 34,670,420 and 16,577,495 shares, respectively, held by PGT, a consolidated VIE.
Schedule of Assumptions Used	The Company determined the fair value of the outstanding Series E-1 preferred stock warrants utilizing the following assumptions as of the following dates: March 31, 2024 December 31, 2023 Volatility 65.0 % 66.0 % Risk-free interest rate 4.40 % 4.10 % Expected term (in years) 2.75 2.75 Dividend yield — % — % The Company determined the fair value of the outstanding Series F Warrants utilizing the following assumptions as of the following dates: March 31, 2024 December 31, 2023 Volatility 65.0 % 66.0 % Risk-free interest rate 4.40 % 4.10 % Expected term (in years) 2.75 2.75 Dividend yield — % — %

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2024
Share-Based Payment Arrangement [Abstract]
Schedule of summarized option activity under option plan	Stock option activity under the 2005 Plan and 2015 Plan is summarized for the three months ended March 31, 2024 below: Options Issued and Outstanding Weighted Average Exercise Price Balance as of January 1, 2024 82,113,271 $ 0.15 Options issued 3,854,515 $ 0.40 Options exercised (251,559) $ 0.03 Options forfeited (2,382,025) $ 0.18 Options expired (15,000) $ 0.02 Balance as of March 31, 2024 83,319,202 $ 0.16 Options vested and expected to vest as of March 31, 2024 76,528,968 $ 0.16 Options vested and exercisable as of March 31, 2024 60,750,156 $ 0.09
Schedule of fair value of stock option awards	The fair value of PMI’s stock option awards granted during the three months ended March 31, 2024 and 2023 was estimated at the date of grant using the Black-Scholes model with the following average assumptions: Three Months Ended March 31, 2024 2023 Volatility of common stock 66.30 % 66.69 % Risk-free interest rate 4.17 % 3.67 % Expected life (in years) 6.0 years 6.0 years Dividend yield — % — %
Schedule of restricted stock unit	The following table summarizes the number of PMI’s RSU activity for three months ended March 31, 2024: Number of Shares Weighted-Average Grant Date Fair Value Unvested at January 1, 2024 2,574,633 $ 1.03 Forfeited (9,500) $ 2.18 Unvested at March 31, 2024 2,565,133 $ 1.02
Schedule of stock based compensation included in consolidated statements of operations	The following table presents the amount of stock-based compensation related to stock-based awards granted to employees recognized in Prosper’s condensed consolidated statements of operations for the periods presented (in thousands): Three Months Ended March 31, 2024 2023 Origination and servicing $ 19 $ 21 Sales and marketing 113 36 General and administrative 260 311 Total stock-based compensation $ 392 $ 368

LEASES (Tables)

LEASES (Tables)	3 Months Ended
	Mar. 31, 2024
Leases [Abstract]
Schedule of Operating Lease Right-of-Use Assets	The following table summarizes the operating lease right-of-use assets as of March 31, 2024, which are included in “Property and Equipment, Net” on the condensed consolidated balance sheets. March 31, 2024 Gross Carrying Value Accumulated Amortization Net Carrying Value ROU Assets - Office buildings $ 22,690 $ 12,347 $ 10,343
Schedule of Future Minimum Lease Payments	Future maturities of operating lease liabilities as of March 31, 2024 were as follows (in thousands). The present value of the future minimum lease payments represents our operating lease liabilities as of March 31, 2024 and are included in " Other Liabilities March 31, 2024 Remainder of 2024 $ 3,181 2025 4,247 2026 4,648 2027 3,834 2028 1,948 Thereafter 411 Total future minimum lease payments $ 18,269 Less imputed interest (4,216) Present value of future minimum lease payments $ 14,053
Schedule of Other Information Related to Leases	Other information related to leases was as follows (dollars in thousands): March 31, 2024 Weighted average remaining lease term (in years) 4.07 years Weighted average discount rate 12.50 %

Related Parties (Tables)

Related Parties (Tables)	3 Months Ended
	Mar. 31, 2024
Entity Information [Line Items]
Schedule of Aggregate Amount of Notes Purchased and the Income Earned	The aggregate amount of the Notes purchased and the income earned by parties deemed to be affiliates and related parties of Prosper for the three months ended March 31, 2024 and 2023, as well as the Notes outstanding as of March 31, 2024 and December 31, 2023 are summarized below (in thousands): Aggregate Amount of Interest Earned on Notes Related Party 2024 2023 2024 2023 Executive officers and management $ 12 $ 9 $ 3 $ 2 Directors (excluding executive officers and management) — — — — Total $ 12 $ 9 $ 3 $ 2 Notes Balance as of Related Party March 31, 2024 December 31, Executive officers and management $ 64 $ 64 Directors (excluding executive officers and management) 1 1 Total $ 65 $ 65
Prosper Funding LLC
Entity Information [Line Items]
Schedule of Aggregate Amount of Notes Purchased and the Income Earned	The aggregate amount of the Notes purchased and the income earned by parties deemed to be related parties of PFL for the three months ended March 31, 2024 and 2023 are summarized below (in thousands): Aggregate Amount of Notes Purchased Interest Earned on Notes Three Months Ended March 31, Three Months Ended March 31, Related Party 2024 2023 2024 2023 Executive officers and management $ 8 $ 8 $ 2 $ 2 Directors (excluding executive officers and management) — — — — Total $ 8 $ 8 $ 2 $ 2 The balance of Notes held by officers and directors who are not executive officers are as follows (in thousands): Notes Balance as of Related Party March 31, 2024 December 31, 2023 Executive officers and management $ 47 $ 47 Directors (excluding executive officers and management) — — Total $ 47 $ 47

Segments (Tables)

Segments (Tables)	3 Months Ended
	Mar. 31, 2024
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	The tables below present segment information reconciled to consolidated Total Net Revenue and Net Income (Loss) Before Income Taxes, as well as interest income and expense included in segment Adjusted Net Revenue and Adjusted EBITDA, for the periods indicated (in thousands). Three Months Ended March 31, 2024 Personal Loan Home Equity Credit Card Total Total Net Revenue $ 30,968 $ 297 $ 12,228 $ 43,493 Impact of interest rates on fair value of loans held in consolidated trusts 2,067 — — 2,067 Accelerated amortization of PWIT debt issuance costs 733 — — 733 Segment Adjusted Net Revenue $ 33,768 $ 297 $ 12,228 $ 46,293 Segment Adjusted EBITDA $ (1,018) $ 44 $ 4,008 $ 3,034 Depreciation expense: Origination and Servicing (2,392) General and Administration - Other (488) Amortization of intangibles (20) Stock-based compensation (392) Change in Fair Value of Convertible Preferred Stock Warrants 27,724 Impact of interest rates on fair value of loans held in consolidated trusts (2,067) Interest income on cash and cash equivalents 875 Interest Expense on Term Loan (3,220) Accelerated amortization of PWIT debt issuance costs (733) Net Income Before Income Taxes $ 22,321 Interest Income (Expense) Included in Segment Adjusted EBITDA Interest Income on Borrower Loans and Loans Held for Sale $ 24,236 $ — $ — $ 24,236 Interest Expense on Financial Instruments (21,025) — — (21,025) Accelerated amortization of PWIT debt issuance costs 733 — — 733 Total Interest Income, Net $ 3,944 $ — $ — $ 3,944 Three Months Ended March 31, 2023 Personal Loan Home Equity Credit Card Total Total Net Revenue $ 33,494 $ 293 $ 6,585 $ 40,372 Impact of interest rates on fair value of loans held in consolidated trusts 1,206 — — 1,206 Segment Adjusted Net Revenue $ 34,700 $ 293 $ 6,585 $ 41,578 Segment Adjusted EBITDA $ (5,281) $ (873) $ (183) $ (6,337) Depreciation expense: Origination and Servicing (2,126) General and Administration - Other (624) Amortization of intangibles (27) Stock-based compensation (368) Change in Fair Value of Convertible Preferred Stock Warrants 4,265 Impact of interest rates on fair value of loans held in consolidated trusts (1,206) Interest income on cash and cash equivalents 355 Interest Expense on Term Loan (2,952) Net Income Before Income Taxes $ (9,020) Interest Income (Expense) Included in Segment Adjusted EBITDA Interest Income on Borrower Loans and Loans Held for Sale $ 29,019 $ — $ — $ 29,019 Interest Expense on Financial Instruments (21,159) — — (21,159) Total Interest Income, Net $ 7,860 $ — $ — $ 7,860

Property and Equipment, Net - S

Property and Equipment, Net - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Total Property and Equipment, Net	Total Property and Equipment, Net
Property and equipment	$ 114,512	$ 111,260
Less: Accumulated depreciation and amortization	(72,777)	(70,371)
Total Property and Equipment, Net	41,735	40,889
Prosper Funding LLC
Property, Plant and Equipment [Line Items]
Less: accumulated depreciation and amortization	(32,751)	(31,978)
Total Property and Equipment, Net	10,891	11,641
Internal-use software and website development costs
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	58,669	58,423
Internal-use software and website development costs | Prosper Funding LLC
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	43,642	43,619
Operating lease right-of-use assets
Property, Plant and Equipment [Line Items]
Operating lease right-of-use assets	22,690	22,655
Computer equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	10,489	10,466
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7,144	6,827
Office equipment and furniture
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,968	2,936
Assets not yet placed in service
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 12,552	$ 9,953

Property and Equipment, Net - A

Property and Equipment, Net - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Property, Plant and Equipment [Line Items]
Depreciation amortization	$ 2,900	$ 2,777
Prosper Funding LLC
Property, Plant and Equipment [Line Items]
Depreciation amortization	1,771	1,506
Property and Equipment
Property, Plant and Equipment [Line Items]
Depreciation amortization	2,900	2,700
Internal-use software and website development costs
Property, Plant and Equipment [Line Items]
Capitalized internal-use software and website development costs	$ 4,100	$ 3,300

Borrower Loans, Loans Held fo_3

Borrower Loans, Loans Held for Sale and Notes, at Fair Value - Fair Value of Borrower Loans and Notes (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
		Mar. 31, 2024	Dec. 31, 2023
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Borrower Loans, at Fair value		$ 644,200	$ 545,038
Loans Held for Sale, at Fair value	[1]	0	161,501
Notes, at Fair value		316,578	321,966
Prosper Funding LLC
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Borrower Loans, at Fair value		322,441	324,311
Notes, at Fair value		316,578	321,966
Notes
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Notes, Aggregate principal balance and interest outstanding		334,139	345,341
Notes, Fair value adjustments		(17,561)	(23,375)
Notes, at Fair value		316,578	321,966
Notes | Prosper Funding LLC
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Notes, Aggregate principal balance and interest outstanding		334,139	345,341
Notes, Fair value adjustments		(17,561)	(23,375)
Notes, at Fair value		316,578	321,966
Borrower Loans
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Borrower Loans, Aggregate principal balance and interest outstanding		675,349	577,029
Fair value adjustments		(31,149)	(31,991)
Borrower Loans, at Fair value		644,200	545,038
Borrower Loans | Prosper Funding LLC
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Borrower Loans, Aggregate principal balance and interest outstanding		338,310	342,791
Fair value adjustments		(15,869)	(18,480)
Borrower Loans, at Fair value		322,441	324,311
Loans Held for Sale
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Loans Held for Sale, Aggregate principal balance and interest outstanding		0	170,925
Fair value adjustments		0	(9,424)
Loans Held for Sale, at Fair value		$ 0	$ 161,501
[1]Includes amounts in consolidated variable interest entities (“VIEs”) presented separately in the table below. The following table presents the assets and liabilities of consolidated VIEs, which are included in the Condensed Consolidated Balance Sheets above. The assets in the table below may only be used to settle obligations of consolidated VIEs and are in excess of those obligations. Additionally, the assets and liabilities in the table below include third-party assets and liabilities of consolidated VIEs only and exclude intercompany balances that eliminate in consolidation. Refer to Note 7, Securitizations , and Note 11, Debt , to the notes to the condensed consolidated financial statements for additional information. March 31, 2024 December 31, 2023 Assets of consolidated VIEs, included in total assets above: Restricted Cash $ 27,528 $ 23,546 Loans Held for Sale, at Fair Value — 161,501 Borrower Loans, at Fair Value 321,758 220,724 Prepaid and Other Assets — 972 Total assets of consolidated VIEs $ 349,286 $ 406,743 Liabilities of consolidated VIEs, included in total liabilities above: Notes Issued by Securitization Trust $ 319,159 $ 214,798 Warehouse Lines — 160,207 Other Liabilities 350 550 Total liabilities of consolidated VIEs $ 319,509 $ 375,555

Borrower Loans, Loans Held fo_4

Borrower Loans, Loans Held for Sale and Notes, at Fair Value - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
		Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Mar. 28, 2024	Sep. 25, 2023
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Non accrual status past due date				120 days
Total interest income, net		$ 3,211	$ 7,860
Notes issued by securitization trust	[1]	319,159		$ 214,798
VIE, Primary Beneficiary
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Notes issued by securitization trust		319,159		$ 214,798
VIE, Primary Beneficiary | Securtization Trust PMT 2023-1
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Notes issued by securitization trust		186,200
VIE, Primary Beneficiary | Securtization Trust PMIT 2024-1
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Notes issued by securitization trust		136,600
Prosper Funding LLC
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total interest income, net		$ 808	862
Prosper Funding LLC | VIE, Primary Beneficiary | Securtization Trust PMT 2023-1
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Notes issued by securitization trust						$ 7,700
Debt fair value						$ 2,000
Prosper Funding LLC | VIE, Primary Beneficiary | Securtization Trust PMIT 2024-1
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Notes issued by securitization trust					$ 4,500
Debt fair value					$ 1,600
Borrower Loans
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Maturity, in months		24 months		24 months
Maturity term two, in months		36 months		36 months
Maturity term three, in months		48 months		48 months
Maturity term four, in months		60 months		60 months
Fixed interest rate, minimum		5.46%		5.46%
Fixed interest rate, maximum		33%		33%
Minimum number of days for which loans originated were delinquent		90 days		90 days
Fair value of loans originated		$ 1,100		$ 1,300
Loans in non-accrual status		$ 1,100		$ 1,000
Borrower Loans | Prosper Funding LLC
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Maturity term one, in months		24 months		24 months
Maturity term two, in months		36 months
Maturity term three, in months		48 months		48 months
Maturity term four, in months		60 months
Fixed interest rate, minimum		5.46%		5.46%
Fixed interest rate, maximum		33%		33%
Minimum number of days for which loans originated were delinquent		90 days		90 days
Fair value of loans originated		$ 800		$ 900
Non accrual status past due date				120 days
Loans in non-accrual status		800		$ 800
Borrower Loans | 90 days or More Past Due
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Aggregate principal amount		7,200		7,000
Borrower Loans | 90 days or More Past Due | Prosper Funding LLC
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Aggregate principal amount		5,200		$ 4,500
Borrower Loans | Minimum | Prosper Funding LLC
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Maturity term two, in months				36 months
Borrower Loans | Maximum | Prosper Funding LLC
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Maturity term four, in months				60 months
Loans Held for Sale
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Maturity term one, in months				24 months
Maturity term two, in months				36 months
Maturity term three, in months				48 months
Maturity term four, in months				60 months
Fixed interest rate, minimum				6%
Fixed interest rate, maximum				33%
Fair value of loans originated				$ 500
Loans in non-accrual status				$ 200
Total interest income, net		$ 4,300	$ 16,500
Minimum number of days for which loans held for sale were delinquent				90 days
Loans Held for Sale | 90 days or More Past Due
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Aggregate principal amount				$ 2,100
[1]Includes amounts in consolidated variable interest entities (“VIEs”) presented separately in the table below. The following table presents the assets and liabilities of consolidated VIEs, which are included in the Condensed Consolidated Balance Sheets above. The assets in the table below may only be used to settle obligations of consolidated VIEs and are in excess of those obligations. Additionally, the assets and liabilities in the table below include third-party assets and liabilities of consolidated VIEs only and exclude intercompany balances that eliminate in consolidation. Refer to Note 7, Securitizations , and Note 11, Debt , to the notes to the condensed consolidated financial statements for additional information. March 31, 2024 December 31, 2023 Assets of consolidated VIEs, included in total assets above: Restricted Cash $ 27,528 $ 23,546 Loans Held for Sale, at Fair Value — 161,501 Borrower Loans, at Fair Value 321,758 220,724 Prepaid and Other Assets — 972 Total assets of consolidated VIEs $ 349,286 $ 406,743 Liabilities of consolidated VIEs, included in total liabilities above: Notes Issued by Securitization Trust $ 319,159 $ 214,798 Warehouse Lines — 160,207 Other Liabilities 350 550 Total liabilities of consolidated VIEs $ 319,509 $ 375,555

Credit Card (Details)

Credit Card (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 30, 2024
Derivative [Line Items]
Various fees and charges	$ 5.8	$ 3.4
Servicing fee, percentage	1%
Change in fair value of servicing liability	$ 0.9	0.9
Credit Card Program Agreement
Derivative [Line Items]
Outstanding credit card principal balance	$ 350		$ 300
Credit Card Program Agreement | Prosper Allocations
Derivative [Line Items]
Revised allocation of customer accounts	95%		90%
Credit Card Program Agreement | Coastal Allocations
Derivative [Line Items]
Revised allocation of customer accounts	5%		10%
Credit Card Derivative
Derivative [Line Items]
Unrealized gains from fair value changes on the Credit Card Derivative	$ 9.1	6.1
Loss on settled transactions	$ 2.7	$ 1.5

Servicing Assets (Details)

Servicing Assets (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Servicing Assets And Liabilities Fair Value [Line Items]
Loss on sale of borrower loans	$ 10,504	$ 1,390
Prosper Funding LLC
Servicing Assets And Liabilities Fair Value [Line Items]
Loss on sale of borrower loans	10,504	640
Servicing Assets
Servicing Assets And Liabilities Fair Value [Line Items]
Outstanding principle	$ 3,100,000		$ 3,100,000
Maturity term one, in months	24 months		24 months
Maturity term two, in months	36 months		36 months
Maturity term three, in months	48 months		48 months
Maturity term four, in months	60 months		60 months
Fixed interest rate, minimum	5.46%		5.46%
Fixed interest rate, maximum	33%		33%
Contractually specified servicing fees, late charges and ancillary fees	$ 7,400	8,200
Servicing Assets | Prosper Funding LLC
Servicing Assets And Liabilities Fair Value [Line Items]
Outstanding principle	$ 3,500,000		$ 3,500,000
Fixed interest rate, minimum	5.46%		5.46%
Fixed interest rate, maximum	33%		33%
Contractually specified servicing fees, late charges and ancillary fees	$ 9,400	$ 10,300
Servicing Assets | Prosper Funding LLC | Minimum
Servicing Assets And Liabilities Fair Value [Line Items]
Maturity term one, in months	24 months		24 months
Maturity term two, in months			36 months
Maturity term three, in months	48 months		48 months
Servicing Assets | Prosper Funding LLC | Maximum
Servicing Assets And Liabilities Fair Value [Line Items]
Maturity term two, in months	36 months
Maturity term four, in months	60 months		60 months

Securitizations (Details)

Securitizations (Details) $ in Thousands		Mar. 31, 2024 USD ($) class		Mar. 28, 2024 USD ($)	Feb. 14, 2024 USD ($)	Dec. 31, 2023 USD ($)		Sep. 25, 2023 USD ($) class	Aug. 31, 2023 USD ($)	Mar. 31, 2023 USD ($)
Variable Interest Entity [Line Items]
Notes Issued by Securitization Trust	[1]	$ 319,159				$ 214,798
Borrower loans		644,200				545,038
Restricted Cash		108,906	[1]			120,298	[1]			$ 118,903
VIE, Primary Beneficiary
Variable Interest Entity [Line Items]
Notes Issued by Securitization Trust		319,159				214,798
Borrower loans		321,758				220,724
Restricted Cash		27,528				$ 23,546
VIE, Primary Beneficiary | Securtization Trust PMT 2023-1
Variable Interest Entity [Line Items]
Securitization amount								$ 266,100	$ 275,900
Number of classes issued | class								5
Notes Issued by Securitization Trust		186,200
Unamortized debt issuance costs								$ 800
Debt issuance costs								2,700
Borrower loans		196,500
Restricted Cash		$ 13,500
VIE, Primary Beneficiary | 2023-1, Class A Notes
Variable Interest Entity [Line Items]
Notes Issued by Securitization Trust								$ 165,500
Interest rate								0.0706
VIE, Primary Beneficiary | 2023-1, Class B Notes
Variable Interest Entity [Line Items]
Notes Issued by Securitization Trust								$ 25,400
Interest rate								0.0748
VIE, Primary Beneficiary | 2023-1, Class C Notes
Variable Interest Entity [Line Items]
Notes Issued by Securitization Trust								$ 25,100
Interest rate								0.0829
VIE, Primary Beneficiary | 2023-1, Class D Notes
Variable Interest Entity [Line Items]
Notes Issued by Securitization Trust								$ 22,300
Interest rate								0.1124
VIE, Primary Beneficiary | 2023-1, Class E Notes
Variable Interest Entity [Line Items]
Notes Issued by Securitization Trust								$ 13,100
Interest rate								0.1549
VIE, Primary Beneficiary | Securtization Trust PMIT 2024-1
Variable Interest Entity [Line Items]
Securitization amount				$ 138,000	$ 148,900
Number of classes issued | class		4
Notes Issued by Securitization Trust		$ 136,600
Debt issuance costs		1,500
Borrower loans		137,600
Restricted Cash		14,100
VIE, Primary Beneficiary | 2024-1, Class A Notes
Variable Interest Entity [Line Items]
Notes Issued by Securitization Trust		$ 105,200
Interest rate		0.0612
VIE, Primary Beneficiary | 2024-1, Class B Notes
Variable Interest Entity [Line Items]
Notes Issued by Securitization Trust		$ 10,800
Interest rate		0.0613
VIE, Primary Beneficiary | 2024-1, Class C Notes
Variable Interest Entity [Line Items]
Notes Issued by Securitization Trust		$ 10,300
Interest rate		0.0696
VIE, Primary Beneficiary | 2024-1, Class D Notes
Variable Interest Entity [Line Items]
Notes Issued by Securitization Trust		$ 10,200
Interest rate		0.1098
[1]Includes amounts in consolidated variable interest entities (“VIEs”) presented separately in the table below. The following table presents the assets and liabilities of consolidated VIEs, which are included in the Condensed Consolidated Balance Sheets above. The assets in the table below may only be used to settle obligations of consolidated VIEs and are in excess of those obligations. Additionally, the assets and liabilities in the table below include third-party assets and liabilities of consolidated VIEs only and exclude intercompany balances that eliminate in consolidation. Refer to Note 7, Securitizations , and Note 11, Debt , to the notes to the condensed consolidated financial statements for additional information. March 31, 2024 December 31, 2023 Assets of consolidated VIEs, included in total assets above: Restricted Cash $ 27,528 $ 23,546 Loans Held for Sale, at Fair Value — 161,501 Borrower Loans, at Fair Value 321,758 220,724 Prepaid and Other Assets — 972 Total assets of consolidated VIEs $ 349,286 $ 406,743 Liabilities of consolidated VIEs, included in total liabilities above: Notes Issued by Securitization Trust $ 319,159 $ 214,798 Warehouse Lines — 160,207 Other Liabilities 350 550 Total liabilities of consolidated VIEs $ 319,509 $ 375,555

Fair Value of Assets and Liab_3

Fair Value of Assets and Liabilities - Fair Value Hierarchy (Details) - USD ($) $ in Thousands		Mar. 31, 2024	Dec. 31, 2023
Assets:
Loans Held for Sale, at Fair Value	[1]	$ 0	$ 161,501
Borrower Loans, at Fair Value		644,200	545,038
SOFR rate swaption (Note 11)			90
Servicing Assets		12,536	12,249
Credit Card Derivative		45,917	36,848
Total Assets		702,653	755,726
Liabilities:
Notes, at Fair Value		316,578	321,966
Convertible Preferred Stock Warrant Liability		187,317	215,041
Loan Trailing Fee Liability (Note 10)		2,938	2,942
Credit Card servicing obligation liability (Note 5)		8,836	9,732
Total Liabilities		515,669	549,681
Prosper Funding LLC
Assets:
Borrower Loans, at Fair Value		322,441	324,311
Servicing Assets		13,785	13,818
Total Assets		336,226	338,129
Liabilities:
Notes, at Fair Value		316,578	321,966
Loan Trailing Fee Liability (Note 10)		2,938	2,942
Total Liabilities		319,516	324,908
Level 1 Inputs
Assets:
Loans Held for Sale, at Fair Value			0
Borrower Loans, at Fair Value		0	0
SOFR rate swaption (Note 11)			0
Servicing Assets		0	0
Credit Card Derivative		0	0
Total Assets		0	0
Liabilities:
Notes, at Fair Value		0	0
Convertible Preferred Stock Warrant Liability		0	0
Loan Trailing Fee Liability (Note 10)		0	0
Credit Card servicing obligation liability (Note 5)		0	0
Total Liabilities		0	0
Level 1 Inputs | Prosper Funding LLC
Assets:
Borrower Loans, at Fair Value		0	0
Servicing Assets		0	0
Total Assets		0	0
Liabilities:
Notes, at Fair Value		0	0
Loan Trailing Fee Liability (Note 10)		0	0
Total Liabilities		0	0
Level 2 Inputs
Assets:
Loans Held for Sale, at Fair Value			0
Borrower Loans, at Fair Value		0	0
SOFR rate swaption (Note 11)			90
Servicing Assets		0	0
Credit Card Derivative		0	0
Total Assets		0	90
Liabilities:
Notes, at Fair Value		0	0
Convertible Preferred Stock Warrant Liability		0	0
Loan Trailing Fee Liability (Note 10)		0	0
Credit Card servicing obligation liability (Note 5)		0	0
Total Liabilities		0	0
Level 2 Inputs | Prosper Funding LLC
Assets:
Borrower Loans, at Fair Value		0	0
Servicing Assets		0	0
Total Assets		0	0
Liabilities:
Notes, at Fair Value		0	0
Loan Trailing Fee Liability (Note 10)		0	0
Total Liabilities		0	0
Level 3 Inputs
Assets:
Loans Held for Sale, at Fair Value			161,501
Borrower Loans, at Fair Value		644,200	545,038
SOFR rate swaption (Note 11)			0
Servicing Assets		12,536	12,249
Credit Card Derivative		45,917	36,848
Total Assets		702,653	755,636
Liabilities:
Notes, at Fair Value		316,578	321,966
Convertible Preferred Stock Warrant Liability		187,317	215,041
Loan Trailing Fee Liability (Note 10)		2,938	2,942
Credit Card servicing obligation liability (Note 5)		8,836	9,732
Total Liabilities		515,669	549,681
Level 3 Inputs | Prosper Funding LLC
Assets:
Borrower Loans, at Fair Value		322,441	324,311
Servicing Assets		13,785	13,818
Total Assets		336,226	338,129
Liabilities:
Notes, at Fair Value		316,578	321,966
Loan Trailing Fee Liability (Note 10)		2,938	2,942
Total Liabilities		$ 319,516	$ 324,908
[1]Includes amounts in consolidated variable interest entities (“VIEs”) presented separately in the table below. The following table presents the assets and liabilities of consolidated VIEs, which are included in the Condensed Consolidated Balance Sheets above. The assets in the table below may only be used to settle obligations of consolidated VIEs and are in excess of those obligations. Additionally, the assets and liabilities in the table below include third-party assets and liabilities of consolidated VIEs only and exclude intercompany balances that eliminate in consolidation. Refer to Note 7, Securitizations , and Note 11, Debt , to the notes to the condensed consolidated financial statements for additional information. March 31, 2024 December 31, 2023 Assets of consolidated VIEs, included in total assets above: Restricted Cash $ 27,528 $ 23,546 Loans Held for Sale, at Fair Value — 161,501 Borrower Loans, at Fair Value 321,758 220,724 Prepaid and Other Assets — 972 Total assets of consolidated VIEs $ 349,286 $ 406,743 Liabilities of consolidated VIEs, included in total liabilities above: Notes Issued by Securitization Trust $ 319,159 $ 214,798 Warehouse Lines — 160,207 Other Liabilities 350 550 Total liabilities of consolidated VIEs $ 319,509 $ 375,555

Fair Value of Assets and Liab_4

Fair Value of Assets and Liabilities - Significant Unobservable Inputs (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Servicing Assets:
Collection fee market rate	0.06%	0.05%
Prosper Funding LLC
Servicing Assets:
Collection fee market rate	0.06%	0.05%
Minimum
Servicing Assets:
Discount rate	15%	15%
Default rate	2.50%	2.80%
Prepayment rate	6.20%	6.10%
Market servicing rate	0.633%	0.633%
Weighted-average market servicing rate	0.693%	0.683%
Minimum | Prosper Funding LLC
Servicing Assets:
Discount rate	15%	15%
Default rate	2.50%	2.80%
Prepayment rate	6.20%	6.10%
Market servicing rate	0.633%	0.633%
Weighted-average market servicing rate	0.693%	0.683%
Maximum
Servicing Assets:
Discount rate	25%	25%
Default rate	24.40%	23.60%
Prepayment rate	30.50%	30.60%
Market servicing rate	0.842%	0.842%
Weighted-average market servicing rate	0.902%	0.892%
Maximum | Prosper Funding LLC
Servicing Assets:
Discount rate	25%	25%
Default rate	24.40%	23.60%
Prepayment rate	31.70%	30.60%
Market servicing rate	0.842%	0.842%
Weighted-average market servicing rate	0.902%	0.892%
Discount rate | Minimum
Borrower Loans, Loans Held for Sale, and Notes [Abstract]
Fair value assumptions	0.054	0.054
Loan Trailing Fee Liability [Abstract]
Fair value assumptions	0.054	0.054
Discount rate | Minimum | Obligations
Borrower Loans, Loans Held for Sale, and Notes [Abstract]
Fair value assumptions	0.150	0.150
Loan Trailing Fee Liability [Abstract]
Fair value assumptions	0.150	0.150
Discount rate | Minimum | Prosper Funding LLC
Borrower Loans, Loans Held for Sale, and Notes [Abstract]
Fair value assumptions	0.055	0.055
Loan Trailing Fee Liability [Abstract]
Fair value assumptions	0.055	0.055
Discount rate | Minimum | Prosper Funding LLC | Obligations
Borrower Loans, Loans Held for Sale, and Notes [Abstract]
Fair value assumptions	0.150	0.150
Loan Trailing Fee Liability [Abstract]
Fair value assumptions	0.150	0.150
Discount rate | Maximum
Borrower Loans, Loans Held for Sale, and Notes [Abstract]
Fair value assumptions	0.111	0.081
Loan Trailing Fee Liability [Abstract]
Fair value assumptions	0.111	0.081
Discount rate | Maximum | Obligations
Borrower Loans, Loans Held for Sale, and Notes [Abstract]
Fair value assumptions	0.250	0.250
Loan Trailing Fee Liability [Abstract]
Fair value assumptions	0.250	0.250
Discount rate | Maximum | Prosper Funding LLC
Borrower Loans, Loans Held for Sale, and Notes [Abstract]
Fair value assumptions	0.089	0.08
Loan Trailing Fee Liability [Abstract]
Fair value assumptions	0.089	0.08
Discount rate | Maximum | Prosper Funding LLC | Obligations
Borrower Loans, Loans Held for Sale, and Notes [Abstract]
Fair value assumptions	0.250	0.250
Loan Trailing Fee Liability [Abstract]
Fair value assumptions	0.250	0.250
Default rate | Minimum
Borrower Loans, Loans Held for Sale, and Notes [Abstract]
Fair value assumptions	0.029	0.032
Loan Trailing Fee Liability [Abstract]
Fair value assumptions	0.029	0.032
Default rate | Minimum | Obligations
Borrower Loans, Loans Held for Sale, and Notes [Abstract]
Fair value assumptions	0.025	0.028
Loan Trailing Fee Liability [Abstract]
Fair value assumptions	0.025	0.028
Default rate | Minimum | Prosper Funding LLC
Borrower Loans, Loans Held for Sale, and Notes [Abstract]
Fair value assumptions	0.029	0.032
Loan Trailing Fee Liability [Abstract]
Fair value assumptions	0.029	0.032
Default rate | Minimum | Prosper Funding LLC | Obligations
Borrower Loans, Loans Held for Sale, and Notes [Abstract]
Fair value assumptions	0.025	0.028
Loan Trailing Fee Liability [Abstract]
Fair value assumptions	0.025	0.028
Default rate | Maximum
Borrower Loans, Loans Held for Sale, and Notes [Abstract]
Fair value assumptions	0.243	0.236
Loan Trailing Fee Liability [Abstract]
Fair value assumptions	0.243	0.236
Default rate | Maximum | Obligations
Borrower Loans, Loans Held for Sale, and Notes [Abstract]
Fair value assumptions	0.244	0.236
Loan Trailing Fee Liability [Abstract]
Fair value assumptions	0.244	0.236
Default rate | Maximum | Prosper Funding LLC
Borrower Loans, Loans Held for Sale, and Notes [Abstract]
Fair value assumptions	0.240	0.236
Loan Trailing Fee Liability [Abstract]
Fair value assumptions	0.240	0.236
Default rate | Maximum | Prosper Funding LLC | Obligations
Borrower Loans, Loans Held for Sale, and Notes [Abstract]
Fair value assumptions	0.244	0.236
Loan Trailing Fee Liability [Abstract]
Fair value assumptions	0.244	0.236
Prepayment rate | Minimum | Obligations
Borrower Loans, Loans Held for Sale, and Notes [Abstract]
Fair value assumptions	0.062	0.061
Loan Trailing Fee Liability [Abstract]
Fair value assumptions	0.062	0.061
Prepayment rate | Minimum | Prosper Funding LLC | Obligations
Borrower Loans, Loans Held for Sale, and Notes [Abstract]
Fair value assumptions	0.062	0.061
Loan Trailing Fee Liability [Abstract]
Fair value assumptions	0.062	0.061
Prepayment rate | Maximum | Obligations
Borrower Loans, Loans Held for Sale, and Notes [Abstract]
Fair value assumptions	0.305	0.306
Loan Trailing Fee Liability [Abstract]
Fair value assumptions	0.305	0.306
Prepayment rate | Maximum | Prosper Funding LLC | Obligations
Borrower Loans, Loans Held for Sale, and Notes [Abstract]
Fair value assumptions	0.317	0.306
Loan Trailing Fee Liability [Abstract]
Fair value assumptions	0.317	0.306

Fair Value of Assets and Liab_5

Fair Value of Assets and Liabilities - Significant Unobservable Inputs - Servicing Rights (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Servicing Rights at Fair Value [Line Items]
Collection fee market rate	0.06%	0.05%
Prosper Funding LLC
Servicing Rights at Fair Value [Line Items]
Collection fee market rate	0.06%	0.05%
Minimum
Servicing Rights at Fair Value [Line Items]
Discount rate	15%	15%
Default rate	2.50%	2.80%
Prepayment rate	6.20%	6.10%
Market servicing rate	0.633%	0.633%
Weighted-average market servicing rate	0.693%	0.683%
Minimum | Prosper Funding LLC
Servicing Rights at Fair Value [Line Items]
Discount rate	15%	15%
Default rate	2.50%	2.80%
Prepayment rate	6.20%	6.10%
Market servicing rate	0.633%	0.633%
Weighted-average market servicing rate	0.693%	0.683%
Maximum
Servicing Rights at Fair Value [Line Items]
Discount rate	25%	25%
Default rate	24.40%	23.60%
Prepayment rate	30.50%	30.60%
Market servicing rate	0.842%	0.842%
Weighted-average market servicing rate	0.902%	0.892%
Maximum | Prosper Funding LLC
Servicing Rights at Fair Value [Line Items]
Discount rate	25%	25%
Default rate	24.40%	23.60%
Prepayment rate	31.70%	30.60%
Market servicing rate	0.842%	0.842%
Weighted-average market servicing rate	0.902%	0.892%

Fair Value of Assets and Liab_6

Fair Value of Assets and Liabilities - Significant Unobservable Inputs - Loan Trailing Fee Liability (Details)	Mar. 31, 2024	Dec. 31, 2023
Discount rate | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value assumptions	0.054	0.054
Discount rate | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value assumptions	0.111	0.081
Discount rate | Prosper Funding LLC | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value assumptions	0.055	0.055
Discount rate | Prosper Funding LLC | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value assumptions	0.089	0.08
Discount rate | Obligations | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value assumptions	0.150	0.150
Discount rate | Obligations | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value assumptions	0.250	0.250
Discount rate | Obligations | Prosper Funding LLC | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value assumptions	0.150	0.150
Discount rate | Obligations | Prosper Funding LLC | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value assumptions	0.250	0.250
Default rate | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value assumptions	0.029	0.032
Default rate | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value assumptions	0.243	0.236
Default rate | Prosper Funding LLC | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value assumptions	0.029	0.032
Default rate | Prosper Funding LLC | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value assumptions	0.240	0.236
Default rate | Obligations | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value assumptions	0.025	0.028
Default rate | Obligations | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value assumptions	0.244	0.236
Default rate | Obligations | Prosper Funding LLC | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value assumptions	0.025	0.028
Default rate | Obligations | Prosper Funding LLC | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value assumptions	0.244	0.236
Prepayment rate | Obligations | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value assumptions	0.062	0.061
Prepayment rate | Obligations | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value assumptions	0.305	0.306
Prepayment rate | Obligations | Prosper Funding LLC | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value assumptions	0.062	0.061
Prepayment rate | Obligations | Prosper Funding LLC | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value assumptions	0.317	0.306

Fair Value of Assets and Liab_7

Fair Value of Assets and Liabilities - Changes in Level 3 Fair Value Assets and Liabilities on a Recurring Basis (Details) - Recurring - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Total
Beginning balance, Total	$ 384,573	$ 501,703
Originations	490,095	571,068
Principal repayments	(50,510)	(62,705)
Borrower Loans sold to third parties	(490,012)	(445,221)
Other changes	(313)	816
Change in fair value	(6,211)	(9,845)
Transfer of Loans Held for Sale to Borrower Loans upon PMIT 2024-1 Transaction, at Fair Value	0
Ending balance, Total	327,622	555,816
Prosper Funding LLC
Total
Beginning balance, Total	2,345	1,938
Originations	490,095	571,068
Borrower Loans contributed by Parent, at Fair Value	1,634
Principal repayments	(1,682)	(796)
Borrower Loans sold to third parties	(489,320)	(570,755)
Other changes	113	54
Change in fair value	(686)	(380)
Ending balance, Total	5,863	2,721
Notes
Liabilities
Beginning balance, Liabilities	(321,966)	(318,704)
Originations	(49,589)	(62,643)
Principal repayments	49,806	46,283
Borrower Loans sold to third parties	0	0
Other changes	300	(51)
Change in fair value	4,871	7,429
Transfer of Loans Held for Sale to Borrower Loans upon PMIT 2024-1 Transaction, at Fair Value	0
Ending balance, Liabilities	(316,578)	(327,686)
Notes | Prosper Funding LLC
Liabilities
Beginning balance, Liabilities	(321,966)	(318,704)
Originations	(49,589)	(62,643)
Borrower Loans contributed by Parent, at Fair Value	0
Principal repayments	49,806	46,283
Borrower Loans sold to third parties	0	0
Other changes	299	(51)
Change in fair value	4,872	7,429
Ending balance, Liabilities	(316,578)	(327,686)
Borrower Loans
Assets
Beginning balance, Assets	545,038	320,642
Originations	51,854	63,909
Principal repayments	(77,762)	(45,487)
Borrower Loans sold to third parties	(1,490)	(953)
Other changes	(310)	105
Change in fair value	(8,819)	(7,809)
Transfer of Loans Held for Sale to Borrower Loans upon PMIT 2024-1 Transaction, at Fair Value	135,689
Ending balance, Assets	644,200	330,407
Borrower Loans | Prosper Funding LLC
Assets
Beginning balance, Assets	324,311	320,642
Originations	51,854	63,909
Borrower Loans contributed by Parent, at Fair Value	1,634
Principal repayments	(48,124)	(45,487)
Borrower Loans sold to third parties	(1,490)	(953)
Other changes	(186)	105
Change in fair value	(5,558)	(7,809)
Ending balance, Assets	322,441	330,407
Loans Held for Sale
Assets
Beginning balance, Assets	161,501	499,765
Originations	487,830	569,802
Principal repayments	(22,554)	(63,501)
Borrower Loans sold to third parties	(488,522)	(444,268)
Other changes	(303)	762
Change in fair value	(2,263)	(9,465)
Transfer of Loans Held for Sale to Borrower Loans upon PMIT 2024-1 Transaction, at Fair Value	(135,689)
Ending balance, Assets	0	553,095
Loans Held for Sale | Prosper Funding LLC
Assets
Beginning balance, Assets	0	0
Originations	487,830	569,802
Borrower Loans contributed by Parent, at Fair Value	0
Principal repayments	0	0
Borrower Loans sold to third parties	(487,830)	(569,802)
Other changes	0	0
Change in fair value	0	0
Ending balance, Assets	$ 0	$ 0

Fair Value of Assets and Liab_8

Fair Value of Assets and Liabilities - Summary of Additional Information for Level 3 Fair Value Balances (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Servicing Assets
Beginning balance	$ 12,249
Ending balance	12,536
Prosper Funding LLC
Servicing Assets
Beginning balance	13,818
Ending balance	13,785
Servicing Assets
Servicing Assets
Beginning balance	12,249
Ending balance	12,536
Servicing Assets | Prosper Funding LLC
Servicing Assets
Beginning balance	13,818
Ending balance	13,785
Level 3 Inputs
Servicing Assets
Beginning balance	12,249
Ending balance	12,536
Level 3 Inputs | Credit Card Derivative | Derivative
Credit Card Derivative
Beginning balance, Assets	36,848	$ 10,782
Change in fair value	9,069	6,101
Ending balance, Assets	45,917	16,883
Level 3 Inputs | Prosper Funding LLC
Servicing Assets
Beginning balance	13,818
Ending balance	13,785
Level 3 Inputs | Servicing Assets
Servicing Assets
Beginning balance	12,249	12,562
Additions	2,504	2,313
Less: Changes in fair value	(2,217)	(2,159)
Ending balance	12,536	12,716
Level 3 Inputs | Servicing Assets | Prosper Funding LLC
Servicing Assets
Beginning balance	13,818	14,860
Additions	2,503	2,939
Less: Changes in fair value	(2,536)	(2,550)
Ending balance	13,785	15,249
Level 3 Inputs | Convertible Preferred Stock Warrant Liability
Liabilities
Beginning balance	215,041	166,346
Change in fair value	(27,724)	(4,265)
Ending balance	187,317	162,081
Level 3 Inputs | Credit Card Servicing Obligation Liability
Liabilities
Beginning balance	9,732	3,720
Change in fair value	(896)	906
Ending balance	8,836	4,626
Level 3 Inputs | Loan Trailing Fee Liability
Liabilities
Beginning balance	2,942	3,290
Issuances	488	589
Cash Payment of Loan Trailing Fee	(660)	(708)
Change in fair value	168	137
Ending balance	2,938	3,308
Level 3 Inputs | Loan Trailing Fee Liability | Prosper Funding LLC
Liabilities
Beginning balance	2,942	3,290
Issuances	488	589
Cash Payment of Loan Trailing Fee	(660)	(708)
Change in fair value	168	137
Ending balance	$ 2,938	$ 3,308

Fair Value of Assets and Liab_9

Fair Value of Assets and Liabilities - Fair Value Assumptions for Borrower Loans, Loans Held for Sale and Notes (Details) $ in Thousands	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower Loans, at Fair Value	$ 644,200	$ 545,038
Notes, at Fair Value	316,578	321,966
Level 3 Inputs
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower Loans, at Fair Value	644,200	545,038
Notes, at Fair Value	316,578	321,966
Prosper Funding LLC
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower Loans, at Fair Value	322,441	324,311
Notes, at Fair Value	316,578	321,966
Prosper Funding LLC | Level 3 Inputs
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower Loans, at Fair Value	322,441	324,311
Notes, at Fair Value	316,578	321,966
Notes
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes, at Fair Value	316,578	321,966
Notes | Prosper Funding LLC
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower Loans, at Fair Value		324,311
Notes, at Fair Value	316,578	321,966
Borrower loans and loans held for sale
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower Loans, at Fair Value	644,200	706,539
Borrower loans and loans held for sale | Prosper Funding LLC
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower Loans, at Fair Value	322,441	324,311
Discount rate assumption | 100 basis point increase | Notes
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	313,572	318,877
Discount rate assumption | 100 basis point increase | Notes | Prosper Funding LLC
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans		321,204
Notes	313,572	318,877
Discount rate assumption | 100 basis point increase | Borrower loans and loans held for sale
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans	638,091	699,770
Discount rate assumption | 100 basis point increase | Borrower loans and loans held for sale | Prosper Funding LLC
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans	319,385	321,204
Discount rate assumption | 200 basis point incease | Notes
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	310,638	315,863
Discount rate assumption | 200 basis point incease | Notes | Prosper Funding LLC
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans		318,174
Notes	310,638	315,863
Discount rate assumption | 200 basis point incease | Borrower loans and loans held for sale
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans	632,130	693,167
Discount rate assumption | 200 basis point incease | Borrower loans and loans held for sale | Prosper Funding LLC
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans	316,401	318,174
Discount rate assumption | 100 basis point decrease | Notes
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	319,660	325,134
Discount rate assumption | 100 basis point decrease | Notes | Prosper Funding LLC
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans		327,498
Notes	319,660	325,134
Discount rate assumption | 100 basis point decrease | Borrower loans and loans held for sale
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans	650,462	713,481
Discount rate assumption | 100 basis point decrease | Borrower loans and loans held for sale | Prosper Funding LLC
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans	325,577	327,498
Discount rate assumption | 200 basis point decrease | Notes
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	322,820	328,384
Discount rate assumption | 200 basis point decrease | Notes | Prosper Funding LLC
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans		330,766
Notes	322,820	328,384
Discount rate assumption | 200 basis point decrease | Borrower loans and loans held for sale
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans	656,884	720,601
Discount rate assumption | 200 basis point decrease | Borrower loans and loans held for sale | Prosper Funding LLC
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans	328,791	330,766
Default rate assumption | 10 percent increase | Notes
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	312,678	317,359
Default rate assumption | 10 percent increase | Notes | Prosper Funding LLC
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans		319,708
Notes	312,678	317,359
Default rate assumption | 10 percent increase | Borrower loans and loans held for sale
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans	636,336	696,510
Default rate assumption | 10 percent increase | Borrower loans and loans held for sale | Prosper Funding LLC
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans	318,506	319,708
Default rate assumption | 20 percent increase | Notes
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	308,800	312,800
Default rate assumption | 20 percent increase | Notes | Prosper Funding LLC
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans		315,153
Notes	308,800	312,800
Default rate assumption | 20 percent increase | Borrower loans and loans held for sale
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans	628,517	686,586
Default rate assumption | 20 percent increase | Borrower loans and loans held for sale | Prosper Funding LLC
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans	314,593	315,153
Default rate assumption | 10 percent decrease | Notes
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	320,499	326,621
Default rate assumption | 10 percent decrease | Notes | Prosper Funding LLC
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans		328,962
Notes	320,499	326,621
Default rate assumption | 10 percent decrease | Borrower loans and loans held for sale
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans	652,106	716,671
Default rate assumption | 10 percent decrease | Borrower loans and loans held for sale | Prosper Funding LLC
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans	326,399	328,962
Default rate assumption | 20 percent decrease | Notes
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	324,443	331,325
Default rate assumption | 20 percent decrease | Notes | Prosper Funding LLC
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans		333,662
Notes	324,443	331,325
Default rate assumption | 20 percent decrease | Borrower loans and loans held for sale
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans	660,058	726,910
Default rate assumption | 20 percent decrease | Borrower loans and loans held for sale | Prosper Funding LLC
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans	$ 330,380	$ 333,662
Discount rate | Discount rate assumption | Notes
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair value assumptions	0.0731	0.0655
Discount rate | Discount rate assumption | Notes | Prosper Funding LLC
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair value assumptions	0.0731	0.0655
Discount rate | Discount rate assumption | Borrower loans and loans held for sale
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair value assumptions	0.0759	0.0688
Discount rate | Discount rate assumption | Borrower loans and loans held for sale | Prosper Funding LLC
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair value assumptions	0.0732	0.0655
Default rate | Default rate assumption | Notes
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair value assumptions	0.1303	0.1421
Default rate | Default rate assumption | Notes | Prosper Funding LLC
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair value assumptions	0.1303	0.1421
Default rate | Default rate assumption | Borrower loans and loans held for sale
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair value assumptions	0.1141	0.1244
Default rate | Default rate assumption | Borrower loans and loans held for sale | Prosper Funding LLC
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair value assumptions	0.1329	0.1436

Fair Value of Assets and Lia_10

Fair Value of Assets and Liabilities - Schedule of Prosper's and Prosper Funding's Estimated Fair Value of Servicing Assets and Liabilities (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Servicing Assets And Liabilities Fair Value [Line Items]
Servicing Assets	$ 12,536	$ 12,249
Credit Card Servicing Obligation Liability
Servicing Assets And Liabilities Fair Value [Line Items]
Changes in estimate increased the credit card derivative	8,836	9,732
Prosper Funding LLC
Servicing Assets And Liabilities Fair Value [Line Items]
Servicing Assets	13,785	13,818
Servicing Assets
Servicing Assets And Liabilities Fair Value [Line Items]
Servicing Assets	12,536	12,249
Servicing Assets | Prosper Funding LLC
Servicing Assets And Liabilities Fair Value [Line Items]
Servicing Assets	13,785	13,818
Market servicing rate | Servicing Assets | Market servicing rate increase of 0.025%
Servicing Assets And Liabilities Fair Value [Line Items]
Expected fair value with change in assumptions	11,737	11,475
Market servicing rate | Servicing Assets | Market servicing rate increase of 0.025% | Prosper Funding LLC
Servicing Assets And Liabilities Fair Value [Line Items]
Expected fair value with change in assumptions	12,907	12,945
Market servicing rate | Servicing Assets | Market servicing rate decrease of 0.025%
Servicing Assets And Liabilities Fair Value [Line Items]
Expected fair value with change in assumptions	13,335	13,023
Market servicing rate | Servicing Assets | Market servicing rate decrease of 0.025% | Prosper Funding LLC
Servicing Assets And Liabilities Fair Value [Line Items]
Expected fair value with change in assumptions	14,664	14,691
Prepayment rate assumption | Servicing Assets | Applying a 1.1 multiplier to prepayment rate
Servicing Assets And Liabilities Fair Value [Line Items]
Expected fair value with change in assumptions	12,250	11,969
Prepayment rate assumption | Servicing Assets | Applying a 1.1 multiplier to prepayment rate | Prosper Funding LLC
Servicing Assets And Liabilities Fair Value [Line Items]
Expected fair value with change in assumptions	13,471	13,502
Prepayment rate assumption | Servicing Assets | Applying a 0.9 multiplier to prepayment rate
Servicing Assets And Liabilities Fair Value [Line Items]
Expected fair value with change in assumptions	12,827	12,533
Prepayment rate assumption | Servicing Assets | Applying a 0.9 multiplier to prepayment rate | Prosper Funding LLC
Servicing Assets And Liabilities Fair Value [Line Items]
Expected fair value with change in assumptions	14,105	14,139
Default rate assumption | Servicing Assets | Applying a 1.1 multiplier to default rate
Servicing Assets And Liabilities Fair Value [Line Items]
Expected fair value with change in assumptions	12,280	11,998
Default rate assumption | Servicing Assets | Applying a 1.1 multiplier to default rate | Prosper Funding LLC
Servicing Assets And Liabilities Fair Value [Line Items]
Expected fair value with change in assumptions	13,503	13,534
Default rate assumption | Servicing Assets | Applying a 0.9 multiplier to default rate
Servicing Assets And Liabilities Fair Value [Line Items]
Expected fair value with change in assumptions	12,794	12,503
Default rate assumption | Servicing Assets | Applying a 0.9 multiplier to default rate | Prosper Funding LLC
Servicing Assets And Liabilities Fair Value [Line Items]
Expected fair value with change in assumptions	$ 14,069	$ 14,104
Market servicing rate | Servicing Assets
Servicing Assets And Liabilities Fair Value [Line Items]
Valuation techniques	0.65%	0.65%
Market servicing rate | Servicing Assets | Prosper Funding LLC
Servicing Assets And Liabilities Fair Value [Line Items]
Valuation techniques	0.65%	0.65%
Prepayment rate | Credit Card Servicing Obligation Liability
Servicing Assets And Liabilities Fair Value [Line Items]
Derivative liability, measurement input	0.0864	0.0814
Prepayment rate | Servicing Assets
Servicing Assets And Liabilities Fair Value [Line Items]
Valuation techniques	19.41%	19.55%
Prepayment rate | Servicing Assets | Prosper Funding LLC
Servicing Assets And Liabilities Fair Value [Line Items]
Valuation techniques	19.78%	19.96%
Default rate | Credit Card Servicing Obligation Liability
Servicing Assets And Liabilities Fair Value [Line Items]
Derivative liability, measurement input	0.1526	0.1436
Default rate | Servicing Assets
Servicing Assets And Liabilities Fair Value [Line Items]
Valuation techniques	13.93%	15.25%
Default rate | Servicing Assets | Prosper Funding LLC
Servicing Assets And Liabilities Fair Value [Line Items]
Valuation techniques	13.51%	14.74%
Discount rate on Prosper Allocations | Credit Card Servicing Obligation Liability
Servicing Assets And Liabilities Fair Value [Line Items]
Derivative liability, measurement input	0.2353	0.0741
Market servicing rate | Credit Card Servicing Obligation Liability
Servicing Assets And Liabilities Fair Value [Line Items]
Derivative liability, measurement input	0.0200	0.0200

Fair Value of Assets and Lia_11

Fair Value of Assets and Liabilities - Schedule Credit Card Derivative Obligation Liability (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Servicing Assets And Liabilities Fair Value [Line Items]
Credit Card Derivative	$ 45,917	$ 36,848
Credit Card Servicing Obligation Liability
Servicing Assets And Liabilities Fair Value [Line Items]
Changes in estimate increased the credit card derivative	$ 8,836	$ 9,732
Credit Card Servicing Obligation Liability | Discount rate on Prosper Allocations
Servicing Assets And Liabilities Fair Value [Line Items]
Derivative liability, measurement input	0.2353	0.0741
Credit Card Servicing Obligation Liability | Prepayment rate
Servicing Assets And Liabilities Fair Value [Line Items]
Derivative liability, measurement input	0.0864	0.0814
Credit Card Servicing Obligation Liability | Prepayment rate | Applying a 1.1 multiplier to prepayment rate
Servicing Assets And Liabilities Fair Value [Line Items]
Fair value resulting from change	$ 8,733	$ 9,609
Credit Card Servicing Obligation Liability | Prepayment rate | Applying a 0.9 multiplier to prepayment rate
Servicing Assets And Liabilities Fair Value [Line Items]
Fair value resulting from change	$ 8,939	$ 9,858
Credit Card Servicing Obligation Liability | Default rate
Servicing Assets And Liabilities Fair Value [Line Items]
Derivative liability, measurement input	0.1526	0.1436
Credit Card Servicing Obligation Liability | Default rate | Applying a 1.1 multiplier to default rate
Servicing Assets And Liabilities Fair Value [Line Items]
Fair value resulting from change	$ 8,628	$ 9,487
Credit Card Servicing Obligation Liability | Default rate | Applying a 0.9 multiplier to default rate
Servicing Assets And Liabilities Fair Value [Line Items]
Fair value resulting from change	$ 9,047	$ 9,984
Credit Card Servicing Obligation Liability | Market servicing rate
Servicing Assets And Liabilities Fair Value [Line Items]
Derivative liability, measurement input	0.0200	0.0200
Credit Card Servicing Obligation Liability | Discount rate | Market servicing rate increase of 0.10%
Servicing Assets And Liabilities Fair Value [Line Items]
Fair value resulting from change	$ 9,294	$ 10,253
Credit Card Servicing Obligation Liability | Discount rate | Market servicing rate decrease of 0.10%
Servicing Assets And Liabilities Fair Value [Line Items]
Fair value resulting from change	$ 8,377	$ 9,213

Fair Value of Assets and Lia_12

Fair Value of Assets and Liabilities - Schedule of Prosper's Estimated Fair Value of Derivative Assets (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Servicing Assets And Liabilities Fair Value [Line Items]
Credit Card Derivative	$ 45,917	$ 36,848
Credit Card Derivative
Servicing Assets And Liabilities Fair Value [Line Items]
Credit Card Derivative	45,917	36,848
Prosper Credit Card portfolio	$ 315,324	$ 286,284
Discount rate on Prosper Allocations | Credit Card Derivative
Servicing Assets And Liabilities Fair Value [Line Items]
Valuation techniques	0.2353	0.2319
Discount rate on Coastal Program Fee (1) | Credit Card Derivative
Servicing Assets And Liabilities Fair Value [Line Items]
Valuation techniques	0.2353	0.0741
Prepayment rate
Servicing Assets And Liabilities Fair Value [Line Items]
Prepayment rate increase	1.10%
Prepayment rate decrease	0.90%
Prepayment rate | Credit Card Derivative
Servicing Assets And Liabilities Fair Value [Line Items]
Valuation techniques	0.0864	0.0814
Prepayment rate | Credit Card Derivative | Applying a 1.1 multiplier to prepayment rate
Servicing Assets And Liabilities Fair Value [Line Items]
Expected fair value with change in assumptions	$ 45,244	$ 36,374
Prepayment rate | Credit Card Derivative | Applying a 0.9 multiplier to prepayment rate
Servicing Assets And Liabilities Fair Value [Line Items]
Expected fair value with change in assumptions	$ 46,600	$ 37,328
Default rate
Servicing Assets And Liabilities Fair Value [Line Items]
Default rate increase	1.10%
Default rate decrease	0.90%
Default rate | Credit Card Derivative
Servicing Assets And Liabilities Fair Value [Line Items]
Valuation techniques	0.1526	0.1436
Default rate | Credit Card Derivative | Applying a 1.1 multiplier to default rate
Servicing Assets And Liabilities Fair Value [Line Items]
Expected fair value with change in assumptions	$ 36,645	$ 29,659
Default rate | Credit Card Derivative | Applying a 0.9 multiplier to default rate
Servicing Assets And Liabilities Fair Value [Line Items]
Expected fair value with change in assumptions	55,499	44,256
Discount rate | Credit Card Derivative | Market servicing rate increase of 0.10%
Servicing Assets And Liabilities Fair Value [Line Items]
Expected fair value with change in assumptions	45,306	36,452
Discount rate | Credit Card Derivative | Market servicing rate decrease of 0.10%
Servicing Assets And Liabilities Fair Value [Line Items]
Expected fair value with change in assumptions	44,712	36,065
Discount rate | Credit Card Derivative | Market servicing rate decrease of 0.10%
Servicing Assets And Liabilities Fair Value [Line Items]
Expected fair value with change in assumptions	46,547	37,253
Discount rate | Credit Card Derivative | Market servicing rate decrease of 0.20%
Servicing Assets And Liabilities Fair Value [Line Items]
Expected fair value with change in assumptions	$ 47,195	$ 37,668

Fair Value of Assets and Lia_13

Fair Value of Assets and Liabilities - Schedule of Prosper's and Prosper Funding's Estimated Fair Value of Servicing Assets and Liabilities - Additional Information (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing rate increase	0.025%
Servicing rate decrease	0.025%
Increased total net revenue and net income	$ 9.2
Credit Card Derivative
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Increase in credit card derivative	7.3
Decrease in Credit servicing obligation	$ 1.9
Prepayment rate assumption
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Prepayment rate increase	1.10%
Prepayment rate decrease	0.90%
Default rate assumption
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Default rate increase	1.10%
Default rate decrease	0.90%

Fair Value of Assets and Lia_14

Fair Value of Assets and Liabilities - Financial Instruments, Assets and Liabilities not Recorded at Fair Value (Details) - USD ($) $ in Thousands		Mar. 31, 2024		Dec. 31, 2023		Mar. 31, 2023
Assets:
Cash and Cash Equivalents		$ 30,297		$ 34,970		$ 41,264
Restricted Cash		108,906	[1]	120,298	[1]	$ 118,903
Accounts Receivable		7,754		7,523
Total Assets		951,931		1,018,042
Liabilities:
Accounts Payable and Accrued Liabilities		52,375		40,906
Payable to Investors		76,063		86,732
Notes Issued by Securitization Trust	[1]	319,159		214,798
Warehouse Lines	[1]	0		160,207
Total Liabilities		1,061,347		1,150,222
Carrying Amount
Assets:
Cash and Cash Equivalents		30,297		34,970
Accounts Receivable		7,754		7,523
Total Assets		146,957		162,791
Liabilities:
Accounts Payable and Accrued Liabilities		52,375		40,906
Payable to Investors		76,063		86,732
Notes Issued by Securitization Trust		319,159		214,798
Warehouse Lines				160,207
Term Loan (Note 11)		75,827		75,313
Total Liabilities		523,424		577,956
Carrying Amount | Cash and Cash Equivalents
Assets:
Restricted Cash		105,878		117,270
Carrying Amount | Certificates of Deposit
Assets:
Restricted Cash		3,028		3,028
Balance at Fair Value
Assets:
Cash and Cash Equivalents		30,297		34,970
Accounts Receivable		7,754		7,523
Total Assets		146,957		162,791
Liabilities:
Accounts Payable and Accrued Liabilities		52,375		40,906
Payable to Investors		76,063		86,732
Notes Issued by Securitization Trust		320,358		208,005
Warehouse Lines				157,972
Term Loan (Note 11)		78,259		77,837
Total Liabilities		527,055		571,452
Balance at Fair Value | Cash and Cash Equivalents
Assets:
Restricted Cash		105,878		117,270
Balance at Fair Value | Certificates of Deposit
Assets:
Restricted Cash		3,028		3,028
Level 1 Inputs
Assets:
Cash and Cash Equivalents		30,297		34,970
Accounts Receivable		0		0
Total Assets		136,175		152,240
Liabilities:
Accounts Payable and Accrued Liabilities		0		0
Payable to Investors		0		0
Notes Issued by Securitization Trust		0		0
Warehouse Lines				0
Term Loan (Note 11)		0		0
Total Liabilities		0		0
Level 1 Inputs | Cash and Cash Equivalents
Assets:
Restricted Cash		105,878		117,270
Level 1 Inputs | Certificates of Deposit
Assets:
Restricted Cash		0		0
Level 2 Inputs
Assets:
Cash and Cash Equivalents		0		0
Accounts Receivable		7,754		7,523
Total Assets		10,782		10,551
Liabilities:
Accounts Payable and Accrued Liabilities		52,375		40,906
Payable to Investors		76,063		86,732
Notes Issued by Securitization Trust		320,358		208,005
Warehouse Lines				157,972
Term Loan (Note 11)		78,259		77,837
Total Liabilities		527,055		571,452
Level 2 Inputs | Cash and Cash Equivalents
Assets:
Restricted Cash		0		0
Level 2 Inputs | Certificates of Deposit
Assets:
Restricted Cash		3,028		3,028
Level 3 Inputs
Assets:
Cash and Cash Equivalents		0		0
Accounts Receivable		0		0
Total Assets		0		0
Liabilities:
Accounts Payable and Accrued Liabilities		0		0
Payable to Investors		0		0
Notes Issued by Securitization Trust		0		0
Warehouse Lines				0
Term Loan (Note 11)		0		0
Total Liabilities		0		0
Level 3 Inputs | Cash and Cash Equivalents
Assets:
Restricted Cash		0		0
Level 3 Inputs | Certificates of Deposit
Assets:
Restricted Cash		$ 0		$ 0
[1]Includes amounts in consolidated variable interest entities (“VIEs”) presented separately in the table below. The following table presents the assets and liabilities of consolidated VIEs, which are included in the Condensed Consolidated Balance Sheets above. The assets in the table below may only be used to settle obligations of consolidated VIEs and are in excess of those obligations. Additionally, the assets and liabilities in the table below include third-party assets and liabilities of consolidated VIEs only and exclude intercompany balances that eliminate in consolidation. Refer to Note 7, Securitizations , and Note 11, Debt , to the notes to the condensed consolidated financial statements for additional information. March 31, 2024 December 31, 2023 Assets of consolidated VIEs, included in total assets above: Restricted Cash $ 27,528 $ 23,546 Loans Held for Sale, at Fair Value — 161,501 Borrower Loans, at Fair Value 321,758 220,724 Prepaid and Other Assets — 972 Total assets of consolidated VIEs $ 349,286 $ 406,743 Liabilities of consolidated VIEs, included in total liabilities above: Notes Issued by Securitization Trust $ 319,159 $ 214,798 Warehouse Lines — 160,207 Other Liabilities 350 550 Total liabilities of consolidated VIEs $ 319,509 $ 375,555

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets, Net - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Goodwill And Other Intangible Assets [Line Items]
Goodwill	$ 36,368,000		$ 36,368,000
Goodwill impairment expense	0	$ 0
Net carrying value	64,000		$ 85,000
Goodwill, Period Increase (Decrease)	0
User base and customer relationships
Goodwill And Other Intangible Assets [Line Items]
Net carrying value	$ 64,000
Remaining useful life (in years)	1 year 1 month 6 days
User base and customer relationships | Minimum
Goodwill And Other Intangible Assets [Line Items]
Remaining useful life (in years)	3 years
User base and customer relationships | Maximum
Goodwill And Other Intangible Assets [Line Items]
Remaining useful life (in years)	10 years

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets, Net - Summary of Other Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 8,170
Accumulated Amortization	(8,106)
Net Carrying Value	64	$ 85
Developed technology
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value	3,060
Accumulated Amortization	(3,060)
Net Carrying Value	0
User base and customer relationships
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value	5,050
Accumulated Amortization	(4,986)
Net Carrying Value	$ 64
Remaining Useful Life (In Years)	1 year 1 month 6 days
Brand name
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 60
Accumulated Amortization	(60)
Net Carrying Value	$ 0

Other Liabilities (Details)

Other Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Other Liabilities [Abstract]
Operating lease liabilities (Note 16)	$ 14,053	$ 14,431
Credit Card servicing obligation liability (Note 5)	8,836	9,732
Deferred revenue	6,652	6,373
Loan trailing fee liability	2,938	2,942
Deferred income tax liability	721	721
Other	828	1,060
Total Other Liabilities	$ 34,028	$ 35,259
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Total Other Liabilities	Total Other Liabilities

Debt (Details)

Debt (Details) $ in Thousands

3 Months Ended

May 05, 2023 USD ($)

Feb. 10, 2023 USD ($)

Mar. 04, 2021 USD ($)

Jun. 20, 2019

Mar. 31, 2024 USD ($)

Dec. 31, 2023 USD ($)

Mar. 28, 2024 USD ($)

Feb. 14, 2024 USD ($)

Sep. 25, 2023 USD ($)

Aug. 31, 2023 USD ($)

Jul. 31, 2023 USD ($)

May 04, 2023 USD ($)

Feb. 09, 2023 USD ($)

Nov. 14, 2022 USD ($)

May 31, 2021 USD ($)

Mar. 28, 2019 USD ($)

Jan. 19, 2018 USD ($)

Line of Credit Facility [Line Items]

Warehouse Lines

[1]

$ 0

$ 160,207

VIE, Primary Beneficiary

Line of Credit Facility [Line Items]

Warehouse Lines

$ 0

$ 160,207

VIE, Primary Beneficiary | Securtization Trust PMIT 2024-1

Line of Credit Facility [Line Items]

Face amount

$ 142,500

Securitization amount

138,000

$ 148,900

Debt issuance costs, line of credit arrangement

700

VIE, Primary Beneficiary | Securtization Trust PMIT 2024-1 | Prosper Funding LLC

Line of Credit Facility [Line Items]

Face amount

4,500

VIE, Primary Beneficiary | Securtization Trust PMT 2023-1

Line of Credit Facility [Line Items]

Face amount

$ 273,800

Securitization amount

266,100

$ 275,900

Debt issuance costs, line of credit arrangement

1,900

VIE, Primary Beneficiary | Securtization Trust PMT 2023-1 | Prosper Funding LLC

Line of Credit Facility [Line Items]

Face amount

7,700

Credit Agreement | Line of Credit

Line of Credit Facility [Line Items]

Face amount

$ 75,000

Debt issuance costs, net

$ 400

Credit Agreement | Line of Credit | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate

Line of Credit Facility [Line Items]

Basis spread on variable rate

9%

Credit Agreement | Line of Credit | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Minimum

Line of Credit Facility [Line Items]

Paid-In-kind interest rate

2%

PWIIT | Revolving Credit Facility

Line of Credit Facility [Line Items]

Line of credit

$ 244,000

$ 450,000

$ 300,000

$ 300,000

$ 200,000

$ 300,000

Advance rate

91.50%

Warehouse Lines

$ 130,400

$ 224,000

PWIIT | Revolving Credit Facility | Interest Rate Swaption

Line of Credit Facility [Line Items]

Derivative notional amount

$ 185,000

Change in fair value

$ 500

PWIIT Class A | Revolving Credit Facility

Line of Credit Facility [Line Items]

Line of credit

$ 200,000

$ 400,000

$ 230,000

265,000

Commitment fee percent

0.50%

PWIIT Class A | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Revolving Credit Facility

Line of Credit Facility [Line Items]

Basis spread on variable rate

2.75%

PWIIT Class A | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Minimum | Revolving Credit Facility

Line of Credit Facility [Line Items]

Increase in basis spread on variable rate

8.50%

PWIIT Class A | National Banking Associations Asset-Backed Commercial Paper Rate | Revolving Credit Facility

Line of Credit Facility [Line Items]

Basis spread on variable rate

2.85%

PWIIT Class B | Revolving Credit Facility

Line of Credit Facility [Line Items]

Line of credit

$ 44,000

$ 50,000

$ 70,000

$ 35,000

PWIIT Class B | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Revolving Credit Facility

Line of Credit Facility [Line Items]

Basis spread on variable rate

8.75%

PWIT | Revolving Credit Facility

Line of Credit Facility [Line Items]

Line of credit

$ 100,000

Repayment period

12 months

Step-up fee, percentage

0.01

Debt instrument, basis spread on variable rate, decrease

0.01

Debt instrument, basis spread on variable rate, maximum decrease

0.865

Warehouse Agreement | Revolving Credit Facility

Line of Credit Facility [Line Items]

Minimum tangible net worth

$ 25,000

Minimum net liquidity

$ 15,000

Maximum leverage ratio

5

[1]Includes amounts in consolidated variable interest entities (“VIEs”) presented separately in the table below. The following table presents the assets and liabilities of consolidated VIEs, which are included in the Condensed Consolidated Balance Sheets above. The assets in the table below may only be used to settle obligations of consolidated VIEs and are in excess of those obligations. Additionally, the assets and liabilities in the table below include third-party assets and liabilities of consolidated VIEs only and exclude intercompany balances that eliminate in consolidation. Refer to Note 7, Securitizations , and Note 11, Debt , to the notes to the condensed consolidated financial statements for additional information. March 31, 2024 December 31, 2023 Assets of consolidated VIEs, included in total assets above: Restricted Cash $ 27,528 $ 23,546 Loans Held for Sale, at Fair Value — 161,501 Borrower Loans, at Fair Value 321,758 220,724 Prepaid and Other Assets — 972 Total assets of consolidated VIEs $ 349,286 $ 406,743 Liabilities of consolidated VIEs, included in total liabilities above: Notes Issued by Securitization Trust $ 319,159 $ 214,798 Warehouse Lines — 160,207 Other Liabilities 350 550 Total liabilities of consolidated VIEs $ 319,509 $ 375,555

Net Income (Loss) Per Share - B

Net Income (Loss) Per Share - Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Numerator:
Net Income (Loss)	$ 22,295	$ (9,090)
Less: Net Income Allocated to Participating Securities	(14,707)	0
Net Income (Loss) Attributable to Common Stockholders	$ 7,588	$ (9,090)
Denominator:
Weighted average shares used in computing basic net income (loss) per share (in shares)	77,070,847	75,187,033
Stock options (in shares)	48,443,891	0
Warrants (in shares)	391,431	0
Convertible preferred stock warrants (in shares)	213,264,845	0
Weighted-average shares used in computing diluted net income (loss) per share (in shares)	339,171,014	75,187,033
Net Income (Loss) Per Share – Basic (in dollars per share)	$ 0.10	$ (0.12)
Net Income (Loss) Per Share - Diluted (in dollars per share)	$ 0.02	$ (0.12)

Net Income (Loss) Per Share - D

Net Income (Loss) Per Share - Dilutive Shares Excluded from Calculation (Details) - shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total common stock equivalents excluded from diluted net income (loss) per common share computation (in shares)	191,977,687	450,844,739
Convertible preferred stock issued and outstanding, excluding shares held by consolidated VIE
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total common stock equivalents excluded from diluted net income (loss) per common share computation (in shares)	158,365,655	158,365,655
Stock options issued and outstanding
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total common stock equivalents excluded from diluted net income (loss) per common share computation (in shares)	32,923,114	78,133,890
Warrants issued and outstanding
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total common stock equivalents excluded from diluted net income (loss) per common share computation (in shares)	688,918	1,080,349
Series E-1 convertible preferred stock warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total common stock equivalents excluded from diluted net income (loss) per common share computation (in shares)	0	35,544,141
Series F convertible preferred stock warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total common stock equivalents excluded from diluted net income (loss) per common share computation (in shares)	0	177,720,704

Convertible Preferred Stock, _3

Convertible Preferred Stock, Convertible Preferred Stock Warrant Liability and Common Stock - Additional Information (Details)						3 Months Ended
	Jul. 21, 2020 shares	Dec. 23, 2019 shares	Feb. 27, 2017 $ / shares shares	Dec. 16, 2016 shares	Feb. 16, 2016	Mar. 31, 2024 USD ($) time vote $ / shares shares	Mar. 31, 2023 USD ($) shares	Dec. 31, 2023 $ / shares shares	Dec. 31, 2022 shares	Sep. 20, 2017 $ / shares shares
Class of Stock [Line Items]
Change in Fair Value of Convertible Preferred Stock Warrants | $						$ (27,724,000)	$ (4,265,000)
Common and preferred stock, shares authorized (in shares)										1,069,760,848
Common stock, authorized (in shares)						625,000,000		625,000,000		625,000,000
Common stock, par value (in dollars per share) | $ / shares						$ 0.01		$ 0.01		$ 0.01
Preferred stock, shares authorized (in shares)						444,760,848		444,760,848		444,760,848
Preferred stock, par value (in dollars per share) | $ / shares										$ 0.01
Common stock, issued (in shares)						78,112,888		77,861,329
Common stock, outstanding (in shares)						77,176,953		76,925,394
Number of votes per share | vote						1
Common Stock
Class of Stock [Line Items]
Stock split conversion ratio					5
Common stock, outstanding (in shares)						82,354,188	80,612,159	82,102,629	79,465,150
Exercise of stock options (in shares)						251,559
Cash proceeds | $						$ 8,000
Series A
Class of Stock [Line Items]
Conversion ratio						1
Times the original issue | time						3
Liquidation preference (in dollars per share) | $ / shares						$ 0.29
Preferred stock, shares authorized (in shares)						68,558,220
Series A | Convertible Preferred Stock Held by Consolidated VIE
Class of Stock [Line Items]
Purchase of convertible preferred stock by consolidated VIE Prosper Grantor Trust (in shares)	34,670,420
Series A-1
Class of Stock [Line Items]
Voting power (at least)						14%
Conversion ratio						1,000,000
Liquidation preference (in dollars per share) | $ / shares						$ 2
Preferred stock, shares authorized (in shares)						24,760,915
Series B
Class of Stock [Line Items]
IPO value (at least) | $						$ 2,000,000,000
Aggregate proceeds (at least) | $						$ 100,000,000
Voting power (at least)						60%
Liquidation preference (in dollars per share) | $ / shares						$ 0.60
Preferred stock, shares authorized (in shares)						35,775,880
Series B | Convertible Preferred Stock Held by Consolidated VIE
Class of Stock [Line Items]
Purchase of convertible preferred stock by consolidated VIE Prosper Grantor Trust (in shares)	16,577,495
Series C
Class of Stock [Line Items]
Liquidation preference (in dollars per share) | $ / shares						$ 2.87
Preferred stock, shares authorized (in shares)						24,404,770
Series D
Class of Stock [Line Items]
Voting power (at least)						60%
Liquidation preference (in dollars per share) | $ / shares						$ 6.91
Series E-1
Class of Stock [Line Items]
Liquidation preference (in dollars per share) | $ / shares						$ 0.84
Warrant to purchase (in shares)			15,277,006
Warrant expiration period				10 years
Change in fair value | $						$ 4,600,000	$ 700,000
Preferred stock, shares authorized (in shares)						35,544,141
Series E-2
Class of Stock [Line Items]
Liquidation preference (in dollars per share) | $ / shares						$ 0.84
Preferred stock, shares authorized (in shares)						16,858,078
Preferred stock, liquidation preference, conversion basis						0.6667
Preferred stock, liquidation preference, conversion basis, after payment						0.3333
Series F
Class of Stock [Line Items]
Voting power (at least)						60%
Liquidation preference (in dollars per share) | $ / shares						$ 0.84
Warrant to purchase (in shares)			177,720,706
Exercise price (in dollars per share) | $ / shares			$ 0.01
Warrant expiration period			10 years
Change in fair value | $						$ 23,100,000	$ 3,600,000
Preferred stock, shares authorized (in shares)						177,720,707
Preferred stock, liquidation preference, conversion basis						0.6667
Preferred stock, liquidation preference, conversion basis, after payment						0.3333
Common Stock
Class of Stock [Line Items]
Purchase of stock by consolidated VIE (in shares)		2,196,665
Series G
Class of Stock [Line Items]
Voting power (at least)						60%
Conversion ratio						1.36
Liquidation preference (in dollars per share) | $ / shares						$ 1.34
Preferred stock, shares authorized (in shares)						37,249,497
Series E-1 And Series E-2 Convertible Preferred Stock
Class of Stock [Line Items]
Voting power (at least)						60%
Series E and F Warrants
Class of Stock [Line Items]
Change in Fair Value of Convertible Preferred Stock Warrants | $						$ 36,400,000
Series E-1 Warrants
Class of Stock [Line Items]
Warrant to purchase (in shares)				20,267,135
Exercise price (in dollars per share) | $ / shares			$ 0.01

Convertible Preferred Stock, _4

Convertible Preferred Stock, Convertible Preferred Stock Warrant Liability and Common Stock - Summary of Shares Information (Details) - USD ($) $ / shares in Units, $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 20, 2017
Class of Stock [Line Items]
Convertible preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Convertible preferred stock, authorized (in shares)	444,760,848	444,760,848			444,760,848
Convertible preferred stock, issued (in shares)	209,613,570	209,613,570
Convertible preferred stock, outstanding (in shares)	209,613,570	209,613,570
Liquidation Preference, Outstanding Shares	$ 370,456	$ 370,456
Convertible Preferred Stock Held by Consolidated VIE
Class of Stock [Line Items]
Convertible preferred stock, outstanding (in shares)	51,247,915	51,247,915	51,247,915	51,247,915
Series A
Class of Stock [Line Items]
Convertible preferred stock, par value (in dollars per share)	$ 0.01
Convertible preferred stock, authorized (in shares)	68,558,220
Convertible preferred stock, issued (in shares)	66,428,185
Convertible preferred stock, outstanding (in shares)	66,428,185
Liquidation Preference, Outstanding Shares	$ 19,160
Series A | Convertible Preferred Stock Held by Consolidated VIE
Class of Stock [Line Items]
Convertible preferred stock, issued (in shares)	34,670,420
Convertible preferred stock, outstanding (in shares)	34,670,420
Series A-1
Class of Stock [Line Items]
Convertible preferred stock, par value (in dollars per share)	$ 0.01
Convertible preferred stock, authorized (in shares)	24,760,915
Convertible preferred stock, issued (in shares)	22,515,315
Convertible preferred stock, outstanding (in shares)	22,515,315
Liquidation Preference, Outstanding Shares	$ 45,031
Series B
Class of Stock [Line Items]
Convertible preferred stock, par value (in dollars per share)	$ 0.01
Convertible preferred stock, authorized (in shares)	35,775,880
Convertible preferred stock, issued (in shares)	35,127,160
Convertible preferred stock, outstanding (in shares)	35,127,160
Liquidation Preference, Outstanding Shares	$ 21,190
Series B | Convertible Preferred Stock Held by Consolidated VIE
Class of Stock [Line Items]
Convertible preferred stock, issued (in shares)	16,577,495
Convertible preferred stock, outstanding (in shares)	16,577,495
Series C
Class of Stock [Line Items]
Convertible preferred stock, par value (in dollars per share)	$ 0.01
Convertible preferred stock, authorized (in shares)	24,404,770
Convertible preferred stock, issued (in shares)	24,404,770
Convertible preferred stock, outstanding (in shares)	24,404,770
Liquidation Preference, Outstanding Shares	$ 70,075
Series D
Class of Stock [Line Items]
Convertible preferred stock, par value (in dollars per share)	$ 0.01
Convertible preferred stock, authorized (in shares)	23,888,640
Convertible preferred stock, issued (in shares)	23,888,640
Convertible preferred stock, outstanding (in shares)	23,888,640
Liquidation Preference, Outstanding Shares	$ 165,000
Series E-1
Class of Stock [Line Items]
Convertible preferred stock, par value (in dollars per share)	$ 0.01
Convertible preferred stock, authorized (in shares)	35,544,141
Convertible preferred stock, issued (in shares)	0
Convertible preferred stock, outstanding (in shares)	0
Liquidation Preference, Outstanding Shares	$ 0
Series E-2
Class of Stock [Line Items]
Convertible preferred stock, par value (in dollars per share)	$ 0.01
Convertible preferred stock, authorized (in shares)	16,858,078
Convertible preferred stock, issued (in shares)	0
Convertible preferred stock, outstanding (in shares)	0
Liquidation Preference, Outstanding Shares	$ 0
Series F
Class of Stock [Line Items]
Convertible preferred stock, par value (in dollars per share)	$ 0.01
Convertible preferred stock, authorized (in shares)	177,720,707
Convertible preferred stock, issued (in shares)	3
Convertible preferred stock, outstanding (in shares)	3
Liquidation Preference, Outstanding Shares	$ 0
Series G
Class of Stock [Line Items]
Convertible preferred stock, par value (in dollars per share)	$ 0.01
Convertible preferred stock, authorized (in shares)	37,249,497
Convertible preferred stock, issued (in shares)	37,249,497
Convertible preferred stock, outstanding (in shares)	37,249,497
Liquidation Preference, Outstanding Shares	$ 50,000

Convertible Preferred Stock, _5

Convertible Preferred Stock, Convertible Preferred Stock Warrant Liability and Common Stock - Valuation Techniques (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Volatility | Series E-1
Class of Stock [Line Items]
Fair value assumptions	0.650	0.660
Volatility | Series F
Class of Stock [Line Items]
Fair value assumptions	0.650	0.660
Risk-free interest rate | Series E-1
Class of Stock [Line Items]
Fair value assumptions	0.0440	0.0410
Risk-free interest rate | Series F
Class of Stock [Line Items]
Fair value assumptions	0.0440	0.0410
Expected term (in years) | Series E-1
Class of Stock [Line Items]
Remaining contractual term (in years)	2 years 9 months	2 years 9 months
Expected term (in years) | Series F
Class of Stock [Line Items]
Remaining contractual term (in years)	2 years 9 months	2 years 9 months
Dividend yield | Series E-1
Class of Stock [Line Items]
Fair value assumptions	0	0
Dividend yield | Series F
Class of Stock [Line Items]
Fair value assumptions	0	0

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options outstanding, term	5 years 7 months 24 days
Dividend yield	0%	0%
Stock options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized cost of unvested share-based compensation awards.	$ 0
RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unamortized expense related to unvested stock-based awards	$ 3,000,000
Weighted average vesting period	2 years 7 months 6 days
RSUs | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	3 years
RSUs | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	4 years

Stock-Based Compensation - Summ

Stock-Based Compensation - Summarized Option Activity under Option Plan (Details) - 2005 Stock Plan and 2015 Stock Option Plan	3 Months Ended
	Mar. 31, 2024 $ / shares shares
Options Issued and Outstanding
Beginning Balance (in shares) | shares	82,113,271
Options issued (in shares) | shares	3,854,515
Options exercised (in shares) | shares	(251,559)
Options forfeited (in shares) | shares	(2,382,025)
Options expired (in shares) | shares	(15,000)
Ending balance (in shares) | shares	83,319,202
Options vested and expected to vest (in shares) | shares	76,528,968
Options vested and exercisable (in shares) | shares	60,750,156
Weighted Average Exercise Price
Beginning balance (in dollars per share) | $ / shares	$ 0.15
Options issued (in dollars per share) | $ / shares	0.40
Options exercised (in dollars per share) | $ / shares	0.03
Options forfeited (in dollars per share) | $ / shares	0.18
Options expired (in dollars per share) | $ / shares	0.02
Ending balance (in dollars per share) | $ / shares	0.16
Options vested and expected to vest (in dollars per share) | $ / shares	0.16
Options vested and exercisable (in dollars per share) | $ / shares	$ 0.09

Stock-Based Compensation - Fair

Stock-Based Compensation - Fair Value of Stock Option Awards (Details)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Fair value of stock option awards [Abstract]
Volatility of common stock	66.30%	66.69%
Risk-free interest rate	4.17%	3.67%
Expected life (in years)	6 years	6 years
Dividend yield	0%	0%

Stock-Based Compensation - Su_2

Stock-Based Compensation - Summarized Activities for the Company's RSU's (Details) - RSUs	3 Months Ended
	Mar. 31, 2024 $ / shares shares
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested, beginning balance (in shares) | shares	2,574,633
Forfeited (in shares) | shares	(9,500)
Unvested, ending balance (in shares) | shares	2,565,133
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Unvested, beginning balance (in dollars per share) | $ / shares	$ 1.03
Forfeited (in dollars per share) | $ / shares	2.18
Unvested, ending balance (in dollars per share) | $ / shares	$ 1.02

Stock-Based Compensation - Stoc

Stock-Based Compensation - Stock Based Compensation Included in Consolidated Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation	$ 392	$ 368
Origination and servicing
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation	19	21
Sales and marketing
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation	113	36
General and administrative
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation	$ 260	$ 311

Income Taxes (Details)

Income Taxes (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Taxes [Line Items]
Income tax expense	$ 26,000	$ 70,000
Prosper Funding LLC
Income Taxes [Line Items]
Income tax expense	$ 0	$ 0
Net effective tax rate	0%

LEASES - Additional Information

LEASES - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Lessee, Lease, Description [Line Items]
Renewal term	5 years
Rental expense under operating lease arrangements	$ 1,000,000	$ 1,100,000
Sublease income	100,000	200,000
Impairment charge	0	$ 0
Operating lease liabilities	$ 14,053,000		$ 14,431,000
Operating lease liability, location	Other Liabilities		Other Liabilities
San Francisco, California | Office
Lessee, Lease, Description [Line Items]
Operating lease, right-of-use asset	$ 300,000
Operating lease liabilities	$ 300,000
Minimum
Lessee, Lease, Description [Line Items]
Operating lease contract term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Operating lease contract term	5 years

LEASES - Operating Lease Right-

LEASES - Operating Lease Right-of-Use Assets (Details) - ROU Assets - Office buildings $ in Thousands	Mar. 31, 2024 USD ($)
Lessee, Lease, Description [Line Items]
Gross Carrying Value	$ 22,690
Accumulated Amortization	12,347
Net Carrying Value	$ 10,343

LEASES - Schedule of Lease Matu

LEASES - Schedule of Lease Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Schedule of Lease Maturity
Remainder of 2024	$ 3,181
2025	4,247
2026	4,648
2027	3,834
2028	1,948
Thereafter	411
Total future minimum lease payments	18,269
Less imputed interest	(4,216)
Present value of future minimum lease payments	$ 14,053	$ 14,431

LEASES - Other Information Rela

LEASES - Other Information Related to Leases (Details)	Mar. 31, 2024
Leases [Abstract]
Weighted average remaining lease term (in years)	4 years 25 days
Weighted average discount rate	12.50%

Commitments and Contingencies (

Commitments and Contingencies (Details)	3 Months Ended
	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Commitments And Contingencies [Line Items]
Minimum fee, remaining nine months of 2024	$ 900,000
Minimum fee, 2025	1,200,000
Minimum fee, 2026	1,200,000
Minimum fee, 2027	$ 100,000
Fee deposits, percentage	0.05
Fee deposits refunds	$ 3,900,000	$ 1,600,000
Purchase commitment of borrower loans	15,000,000
Maximum potential future payments	3,100,000,000
Accrued repurchase and indemnification obligation	400,000	500,000
Repayments of repurchased Notes	100,000
Additional indemnification amount	700,000
Prosper Funding LLC
Commitments And Contingencies [Line Items]
Designated Amount for loans (less than), through February 2025	100,000
Minimum liquidity covenant	$ 15,000,000
Fee deposits, percentage	0.05
Fee deposits refunds	$ 3,900,000	1,600,000
Purchase commitment of borrower loans	15,000,000
Maximum potential future payments	3,500,000,000
Accrued repurchase and indemnification obligation	400,000	$ 500,000
Repayments of repurchased Notes	100,000
Additional indemnification amount	$ 700,000

Related Parties - Additional In

Related Parties - Additional Information (Details)	3 Months Ended
	Mar. 31, 2024
Related Party Transactions [Abstract]
Minimum percentage of voting securities considered for related parties (more than)	10%
Minimum percentage of stockholders considered for related parties	10%

Related Parties- Aggregate Amou

Related Parties- Aggregate Amount of Notes Purchased and the Income Earned (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Executive officers and management
Related Party Transaction [Line Items]
Aggregate Amount of Notes Purchased	$ 12	$ 9
Interest Earned on Notes	3	2
Payable to Related Party	64		$ 64
Executive officers and management | Prosper Funding LLC
Related Party Transaction [Line Items]
Aggregate Amount of Notes Purchased	8	8
Interest Earned on Notes	2	2
Payable to Related Party	47		47
Directors (excluding executive officers and management)
Related Party Transaction [Line Items]
Aggregate Amount of Notes Purchased	0	0
Interest Earned on Notes	0	0
Payable to Related Party	1		1
Directors (excluding executive officers and management) | Prosper Funding LLC
Related Party Transaction [Line Items]
Aggregate Amount of Notes Purchased	0	0
Interest Earned on Notes	0	0
Payable to Related Party	0		0
Management
Related Party Transaction [Line Items]
Aggregate Amount of Notes Purchased	12	9
Interest Earned on Notes	3	2
Payable to Related Party	65		65
Management | Prosper Funding LLC
Related Party Transaction [Line Items]
Aggregate Amount of Notes Purchased	8	8
Interest Earned on Notes	2	$ 2
Payable to Related Party	$ 47		$ 47

Significant Concentrations (Det

Significant Concentrations (Details)	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Mar. 31, 2023
Concentration Risk [Line Items]
Transaction fee cap percentage		7.99%	5%
Related Party One
Concentration Risk [Line Items]
Percentage of loan purchased	31.30%			11.10%
Related Party Two
Concentration Risk [Line Items]
Percentage of loan purchased	19.30%			10.20%
Related Party Three
Concentration Risk [Line Items]
Percentage of loan purchased	12.10%
Related Party Four
Concentration Risk [Line Items]
Percentage of loan purchased	10.30%
Related Party Five
Concentration Risk [Line Items]
Percentage of loan purchased	10.30%
Warehouse VIE
Concentration Risk [Line Items]
Percentage of loan purchased				20%

Segments - Additional Informati

Segments - Additional Information (Details)	3 Months Ended
	Mar. 31, 2024 segment
Segment Reporting [Abstract]
Number of reporting segments	3
Number of operating segments	3

Segments - Segment Information

Segments - Segment Information Reconciled (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Total Net Revenue	$ 43,493	$ 40,372
Impact of interest rates on fair value of loans held in consolidated trusts	2,067	1,206
Accelerated amortization of PWIT debt issuance costs	(733)
Segment Adjusted Net Revenue	46,293	41,578
Segment Adjusted EBITDA	3,034	(6,337)
Depreciation expense:
Origination and Servicing	(2,392)	(2,126)
General and Administration - Other	(488)	(624)
Amortization of intangibles	(20)	(27)
Stock-based compensation	(392)	(368)
Change in Fair Value of Convertible Preferred Stock Warrants	27,724	4,265
Impact Of Fluctuations In Market Interest Rates	(2,067)	(1,206)
Interest income on cash and cash equivalents	875	355
Interest Expense on Term Loan	(3,220)	(2,952)
Accelerated amortization of PWIT debt issuance costs	733
Net Income (Loss) Before Taxes	22,321	(9,020)
Interest Income (Expense) Included in Segment Adjusted EBITDA
Interest Income on Borrower Loans and Loans Held for Sale	24,236	29,019
Interest Expense on Financial Instruments	(21,025)	(21,159)
Segment Adjusted EBITDA Interest Income (Expense), Net	3,944	7,860
Personal Loan
Segment Reporting Information [Line Items]
Total Net Revenue	30,968	33,494
Impact of interest rates on fair value of loans held in consolidated trusts	2,067	1,206
Accelerated amortization of PWIT debt issuance costs	(733)
Segment Adjusted Net Revenue	33,768	34,700
Segment Adjusted EBITDA	(1,018)	(5,281)
Depreciation expense:
Accelerated amortization of PWIT debt issuance costs	733
Interest Income (Expense) Included in Segment Adjusted EBITDA
Interest Income on Borrower Loans and Loans Held for Sale	24,236	29,019
Interest Expense on Financial Instruments	(21,025)	(21,159)
Segment Adjusted EBITDA Interest Income (Expense), Net	3,944	7,860
Home Equity
Segment Reporting Information [Line Items]
Total Net Revenue	297	293
Impact of interest rates on fair value of loans held in consolidated trusts	0	0
Accelerated amortization of PWIT debt issuance costs	0
Segment Adjusted Net Revenue	297	293
Segment Adjusted EBITDA	44	(873)
Depreciation expense:
Accelerated amortization of PWIT debt issuance costs	0
Interest Income (Expense) Included in Segment Adjusted EBITDA
Interest Income on Borrower Loans and Loans Held for Sale	0
Interest Expense on Financial Instruments	0
Segment Adjusted EBITDA Interest Income (Expense), Net	0
Credit Card
Segment Reporting Information [Line Items]
Total Net Revenue	12,228	6,585
Impact of interest rates on fair value of loans held in consolidated trusts	0	0
Accelerated amortization of PWIT debt issuance costs	0
Segment Adjusted Net Revenue	12,228	6,585
Segment Adjusted EBITDA	4,008	(183)
Depreciation expense:
Accelerated amortization of PWIT debt issuance costs	0
Interest Income (Expense) Included in Segment Adjusted EBITDA
Interest Income on Borrower Loans and Loans Held for Sale	0	0
Interest Expense on Financial Instruments	0	0
Segment Adjusted EBITDA Interest Income (Expense), Net	$ 0	$ 0