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Upstart Holdings
(NASDAQ:UPST) 

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Upstart Holdings, Inc. operates a cloud- based artificial intelligence (AI) lending platform. The company's platform aggregates consumer demand for loans and connects it to its network of the company's AI- enabled bank partners. Its platform connects consumers, banks, and institutional investors thr...

Founded: 2012
IPO Price: $20 (Dec 16, 2020)
Full Time Employees: 1,460 (Feb 2023)
Founder: Dave Girouard, Paul Gu, Anna Counselman 
CEO: Dave Girouard  
Sector: Financial Services
Industry: Credit Services

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At a glance:
  • Loan Origination Volumes Rebounded, but Remain Rate- and Credit-Sensitive: Upstart’s revenue is highly tied to platform transaction volume and conversion rates, which can improve as funding capacity returns but typically remain sensitive to interest rates, borrower demand, and credit performance.
  • Funding & Liquidity Access Is a Core Swing Factor: The company’s growth trajectory depends on the depth and stability of its funding partners (banks, credit unions, and capital markets). Any tightening in warehouse lines or securitization markets can constrain originations and pressure results.
  • Credit Performance and Model Calibration Drive Partner Confidence: Investor and bank appetite hinges on delinquency/charge-off trends and Upstart’s ability to recalibrate underwriting models through the credit cycle, influencing approvals, pricing, and retention of funding partners.
  • Path to Sustainable Profitability Hinges on Operating Leverage: Management’s ability to scale volumes without proportionally increasing costs—while maintaining healthy unit economics—remains key to improving margins and reaching consistent GAAP profitability.
  • Regulatory and Litigation Risk Remains a Persistent Overhang: As an AI-driven lending platform, Upstart faces ongoing scrutiny around fair lending, model transparency, and consumer protection, which can increase compliance costs and limit product expansion.
Bull Thesis:
  • Superior AI Underwriting Model: Upstart's proprietary AI/ML models analyze over 1,600 data points, enabling more accurate risk assessment than traditional FICO scores. This allows them to approve more borrowers at lower interest rates for their bank partners, leading to higher conversion and potentially lower default rates over time.
  • Expanding Total Addressable Market (TAM): Upstart is actively expanding beyond personal loans into massive new markets like auto lending and mortgage origination. Successfully penetrating these segments would significantly increase their potential revenue and growth runway, diversifying their loan portfolio and reducing reliance on a single product category.
  • Highly Scalable Platform Business Model: As a platform provider, Upstart can onboard new bank and credit union partners and integrate new loan products with relatively low marginal costs. This scalability allows for rapid growth in loan origination volume without a proportional increase in operational expenses, driving future operating leverage and profitability.
  • Growing Network of Bank Partners: The increasing number of banks and credit unions adopting Upstart's platform validates the effectiveness of their AI model and expands their distribution network. A larger partner base reduces concentration risk and provides a more robust and diversified source of loan funding and origination volume.
Bear Thesis:
  • High Sensitivity to Interest Rates and Economic Downturns: Upstart's business model is highly susceptible to macroeconomic conditions, particularly rising interest rates and economic slowdowns. Higher rates increase the cost of capital for lenders and borrowers, reducing demand for loans and increasing default risk, which can cause bank partners to pull back from lending.
  • Volatility in Funding and Capital Markets: A significant portion of Upstart's loan originations relies on third-party funding from banks and institutional investors. During periods of economic uncertainty or tightening credit markets, these funding sources can become scarce or more expensive, directly impacting Upstart's ability to originate loans and grow revenue.
  • Unproven Model Performance in Severe Stress: While Upstart's AI model has performed well in certain economic cycles, its long-term efficacy and resilience during a prolonged, severe recession or credit crisis remain largely untested. There's a risk that default rates could surge beyond model predictions in extreme economic conditions, leading to significant losses for lenders.
  • Persistent Profitability and Free Cash Flow Challenges: Despite its growth potential, Upstart has struggled to achieve consistent profitability and positive free cash flow, especially during periods of market volatility. The need to sometimes hold loans on its balance sheet to facilitate funding, coupled with high operating expenses, raises concerns about its long-term financial stability and capital efficiency.
Main Competitors:
  • SoFi Technologies ($SOFI) (Personal Loans, Student Loan Refinancing, Mortgages, Investing, Banking), SoFi is a vertically integrated fintech company that offers a wide range of financial products, including personal loans, directly to consumers. They compete with Upstart by using their own proprietary underwriting models and technology to assess creditworthiness and originate loans, often targeting a similar demographic of creditworthy borrowers seeking competitive rates and a streamlined digital experience.
  • LendingClub ($LC) (Personal Loans, Patient Solutions, Small Business Loans), LendingClub, originally a peer-to-peer lending platform, now operates as a full-spectrum digital bank. They directly originate personal loans using their own data-driven underwriting models, competing with Upstart for borrowers seeking unsecured personal loans and offering a fully digital application process.
  • Avant (Personal Loans, Credit Cards), Avant is an online lending platform that provides personal loans and credit cards to consumers, often those with fair-to-good credit. They compete with Upstart by using their own proprietary technology and data analytics to underwrite loans and offer a quick, digital application process, serving a segment of the market that Upstart also targets or could expand into.
  • LightStream (a division of Truist Bank) ($TFC) (Unsecured Personal Loans (for various purposes like home improvement, auto, debt consolidation)), LightStream is the online lending division of Truist Bank, offering unsecured personal loans with competitive rates to highly qualified borrowers. They compete by leveraging the backing of a large traditional bank while providing a fully digital, fast, and transparent lending experience, challenging Upstart's value proposition of speed and efficiency for prime borrowers.
Moat:
Upstart's primary competitive advantage lies in its AI-driven underwriting model, which aims to identify more creditworthy borrowers than traditional FICO-based systems, potentially leading to lower default rates and better interest rates. Its moat is built on the proprietary nature and continuous improvement of its AI, which benefits from more data. However, competition is fierce from other fintech lenders (like SoFi, LendingClub, and Avant) that also leverage technology and alternative data for underwriting, as well as traditional banks (such as Truist via LightStream) that are increasingly digitizing their lending processes and have vast balance sheets. Upstart's unique position as a platform enabling banks, rather than solely a direct lender, offers a distinct competitive angle, but it still vies for the same pool of borrowers and bank partnerships.
Income Statements:
Quarterly
Annual
    Unit: USD2026-03-31 2025-12-31 2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 
                          
      revenue:
                          
      revenue from fees
    277,063,000 265,220,000 258,539,000 240,777,000 185,475,000 199,276,000 167,590,000 130,532,000 138,068,000 152,846,000 146,755,000 143,689,000 117,141,000 155,597,000 179,348,000 258,345,000 313,982,000 287,387,000 210,421,000 187,297,000 116,170,000  
      interest income, interest expense, and fair value adjustments, net:
                          
      interest income
    56,061,000 60,836,000 57,203,000 45,623,000 40,568,000 41,461,000 40,845,000 52,883,000 51,171,000 52,073,000 37,692,000 33,916,000 45,315,000          
      interest expense
    -10,370,000 -8,078,000 -8,794,000 -7,772,000 -7,020,000 -7,431,000 -10,818,000 -11,470,000 -10,714,000 -14,066,000 -9,414,000 -4,282,000 -7,132,000          
      fair value and other adjustments
    -14,540,000 -21,888,000 -29,843,000 -21,337,000 -5,652,000 -14,342,000 -35,477,000 -44,315,000 -50,731,000 -50,541,000 -40,476,000 -37,557,000 -52,397,000          
      total interest income, interest expense, and fair value adjustments
    31,151,000 30,870,000 18,566,000 16,514,000 27,896,000 19,688,000 -5,450,000 -2,902,000 -10,274,000              
      total revenue
    308,214,000 296,090,000 277,105,000 257,291,000 213,371,000 218,964,000 162,140,000 127,630,000 127,794,000 140,312,000 134,557,000 135,766,000 102,927,000 146,913,000 157,233,000 228,162,000 310,136,000 304,848,000 228,450,000 193,946,000 121,345,000  
      yoy
    44.45% 35.22% 70.90% 101.59% 66.96% 56.06% 20.50% -5.99% 24.16% -4.49% -14.42% -40.50% -66.81% -51.81% -31.17% 17.64% 155.58%      
      qoq
    4.09% 6.85% 7.70% 20.58% -2.55% 35.05% 27.04% -0.13% -8.92% 4.28% -0.89% 31.91% -29.94% -6.56% -31.09% -26.43% 1.73% 33.44% 17.79% 59.83%   
      operating expenses:
                          
      sales and marketing
    104,455,000 90,588,000 78,844,000 73,105,000 58,970,000 55,463,000 43,229,000 32,958,000 35,150,000 38,772,000 33,042,000 23,891,000 31,438,000 50,753,000 56,362,000 105,212,000 133,449,000 114,815,000 93,346,000 75,916,000 49,376,000  
      customer operations
    55,095,000 51,840,000 49,790,000 46,246,000 40,501,000 40,602,000 39,302,000 38,684,000 39,408,000 36,117,000 36,914,000 36,797,000 40,590,000 43,487,000 45,028,000 51,072,000 48,407,000 41,049,000 34,978,000 24,164,000 17,388,000  
      engineering and product development
    80,112,000 66,913,000 64,026,000 68,825,000 57,838,000 67,222,000 64,887,000 58,453,000 63,091,000 57,152,000 54,941,000 57,974,000 110,071,000 64,029,000 66,182,000 57,045,000 49,991,000 46,495,000 37,085,000 31,431,000 18,988,000  
      general, administrative, and other
    76,070,000 67,830,000 60,779,000 64,573,000 60,558,000 60,427,000 59,874,000 53,021,000 57,613,000 55,772,000 53,505,000 50,448,000 52,663,000 47,142,000 47,752,000 46,940,000 43,456,000 42,075,000 34,442,000 26,141,000 20,019,000  
      total operating expenses
    315,732,000 277,171,000 253,439,000 252,749,000 217,867,000 223,714,000 207,292,000 183,116,000 195,262,000 187,813,000 178,402,000 169,110,000 234,762,000 205,411,000 215,324,000 260,269,000 275,303,000 244,434,000 199,851,000 157,652,000 105,771,000  
      income from operations
    -7,518,000 18,919,000 23,666,000 4,542,000 -4,496,000 -4,750,000 -45,152,000 -55,486,000 -67,468,000 -47,501,000 -43,845,000 -33,344,000 -131,835,000 -58,498,000 -58,091,000 -32,107,000 34,833,000 60,414,000 28,599,000 36,294,000 15,574,000  
      yoy
    67.22% -498.29% -152.41% -108.19% -93.34% -90.00% 2.98% 66.40% -48.82% -18.80% -24.52% 3.85% -478.48% -196.83% -303.12% -188.46% 123.66%      
      qoq
    -139.74% -20.06% 421.05% -201.02% -5.35% -89.48% -18.62% -17.76% 42.03% 8.34% 31.49% -74.71% 125.37% 0.70% 80.93% -192.17% -42.34% 111.25% -21.20% 133.04%   
      operating margin %
    -2.44% 6.39% 8.54% 1.77% -2.11% -2.17% -27.85% -43.47% -52.79% -33.85% -32.58% -24.56% -128.09% -39.82% -36.95% -14.07% 11.23% 19.82% 12.52% 18.71% 12.83%  
      other income
    956,000 20,115,000 1,017,000 1,114,000 2,078,000 9,800,000 5,078,000 1,031,000 2,884,000 9,872,000 3,540,000 5,197,000 2,597,000 7,455,000 1,880,000 2,260,000  22,000 22,000 15,000 -5,233,000  
      net loss before income taxes
    -6,562,000    -2,418,000 -2,644,000 -6,713,000 -54,455,000 -64,584,000 -49,422,500 -40,305,000            
      provision for income taxes
    84,000 526,000 124,000 49,000 29,000 111,000 45,000 15,000 14,000 63,000 10,000 18,000 16,000 -464,000 12,000 24,000 19,000   -988,000 221,000  
      net income
    -6,646,000 18,636,000 31,805,000 5,607,000 -2,447,000 -2,755,000 -6,758,000 -54,470,000 -64,598,000 -42,398,000 -40,315,000 -28,165,000 -129,254,000 -13,350,500 -56,223,000 -29,871,000 32,692,000      
      yoy
    171.60% -776.44% -570.63% -110.29% -96.21% -93.50% -83.24% 93.40% -50.02% 217.58% -28.29% -5.71% -495.37%          
      qoq
    -135.66% -41.41% 467.24% -329.14% -11.18% -59.23% -87.59% -15.68% 52.36% 5.17% 43.14% -78.21% 868.16% -76.25% 88.22% -191.37%       
      net income margin %
    -2.16% 6.29% 11.48% 2.18% -1.15% -1.26% -4.17% -42.68% -50.55% -30.22% -29.96% -20.75% -125.58% -9.09% -35.76% -13.09% 10.54% 0% 0% 0% 0%  
      net income per share
    -0.07 0.19 0.33 0.06 -0.03 -0.02 -0.07 -0.62 -0.74 -0.49 -0.48 -0.34 -1.58 -0.16 -0.69 -0.36 0.39 0.73 0.37 0.49 0.14  
      weighted-average number of shares outstanding used in computing net loss per share, basic
    96,901,974    94,274,538 89,450,038 90,119,481 88,435,893 87,030,695  84,404,966            
      weighted-average number of shares outstanding used in computing net loss per share, diluted
    96,901,974    94,274,538 89,450,038 90,119,481 88,435,893 87,030,695  84,404,966            
      gain on debt extinguishment
      7,246,000    33,361,000                
      net income before income taxes
     19,162,000 31,929,000 5,656,000        -28,147,000 -129,238,000 -55,727,000 -56,211,000 -29,847,000 32,711,000 59,267,000 27,845,000 36,296,000 10,323,000  
      weighted-average number of shares outstanding used in computing net income per share, basic
     96,030,558 96,682,774 95,526,364      83,765,896  83,130,638 81,911,433  81,672,099 83,833,963 84,230,445      
      weighted-average number of shares outstanding used in computing net income per share, diluted
     107,492,735 109,724,669 102,852,284      83,765,896  83,130,638 81,911,433  81,672,099 83,833,963 95,457,776      
      interest income and fair value adjustments, net:
                          
      total interest income and fair value adjustments
             -8,583,750 -12,198,000 -7,923,000 -14,214,000          
      interest income and fair value adjustments
                 -14,036,000 -22,115,000 -30,183,000 -3,846,000 17,461,000 18,029,000 6,649,000 5,175,000  
      other expense
                    -2,122,000      
      expense on warrants and convertible notes
                     -1,169,000 -776,000    
      benefit for income taxes
                     -508,750 -1,268,000    
      net income before attribution to noncontrolling interests
                     58,944,000 29,113,000 37,284,000 10,102,000  
      net loss attributable to noncontrolling interests
                          
      net income attributable to upstart holdings, inc. common stockholders
                     58,944,000 29,113,000 37,284,000 10,102,000  
      weighted-average number of shares outstanding used in computing net income per share attributable to upstart holdings, inc. common stockholders, basic
                      79,392,600 76,674,129 73,629,122  
      weighted-average number of shares outstanding used in computing net income per share attributable to upstart holdings, inc. common stockholders, diluted
                 82,771,268    94,772,641 96,057,210 94,802,123 91,449,571  
      income on warrants and other non-operating expenses
                       -13,000 -18,000  
      net income attributable to noncontrolling interests
                          
    Balance Sheets:
    Quarterly
    Annual
      Unit: USD2026-03-31 2025-12-31 2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 
                            
        assets
                            
        cash and cash equivalents
      472,934,000 652,388,000 489,784,000 395,940,000 599,778,000 788,422,000 445,274,000 374,791,000 300,529,000 368,405,000 516,581,000 443,672,000 386,942,000 422,411,000 683,970,000 790,431,000 757,828,000 986,608,000 1,041,460,000 506,287,000 257,017,000 250,819,000 
        restricted cash
      458,400,000 404,624,000 347,121,000 305,520,000 239,750,000 187,841,000 210,493,000 185,827,000 138,622,000 99,382,000 98,447,000 66,221,000 64,917,000 110,056,000 145,956,000 123,990,000 254,866,000 204,633,000 130,301,000 111,246,000 79,049,000 60,514,000 
        loans
      1,014,089,000 984,552,000 1,229,976,000 1,019,504,000 814,677,000 806,304,000 656,120,000 820,628,000 1,080,865,000 1,156,413,000 972,336,000 837,565,000 982,229,000 1,010,421,000 700,455,000 623,763,000 597,981,000 252,477,000 129,625,000 82,311,000 57,189,000 78,460,000 
        property, equipment, and software
      48,002,000 44,174,000 44,259,000 43,942,000 42,407,000 39,013,000 38,328,000 39,728,000 40,555,000 42,655,000 48,010,000 47,010,000 46,977,000 44,168,000 40,990,000 36,054,000 29,816,000 24,259,000 18,898,000 13,549,000 10,098,000 10,032,000 
        operating lease right of use assets
      13,605,000 16,410,000 34,646,000 37,620,000 40,557,000 43,455,000 46,318,000 49,144,000 51,936,000 54,694,000 77,339,000 80,349,000 83,382,000 86,335,000 87,475,000 90,352,000 93,219,000 96,118,000 70,025,000 16,208,000 17,265,000 18,310,000 
        beneficial interest assets
      474,796,000 396,216,000 316,199,000 266,761,000 216,578,000 176,848,000 131,483,000 97,804,000 62,214,000 41,012,000             
        line of credit receivable
      111,916,000 112,742,000                     
        notes receivable and residual certificates
      105,066,000                 8,288,000 10,489,000 12,995,000 16,033,000 19,074,000 
        non-marketable equity securities
      41,250,000 41,250,000 41,250,000 41,250,000 41,250,000 41,250,000 41,250,000 41,250,000 41,250,000 41,250,000 41,250,000 41,250,000 41,250,000 41,250,000 41,000,000 41,000,000 41,000,000  40,000,000    
        goodwill
      67,062,000 67,062,000 67,062,000 67,062,000 67,062,000 67,062,000 67,062,000 67,062,000 67,062,000 67,062,000 67,062,000 67,062,000 67,062,000 67,062,000 67,062,000 67,062,000 67,062,000 67,062,000 66,866,000 66,866,000   
        other assets
      154,561,000 255,387,000 334,551,000 300,269,000 234,218,000 216,763,000 172,652,000 143,990,000 144,634,000 146,227,000 143,780,000 151,919,000 134,399,000 138,720,000 131,702,000 126,598,000 126,982,000 121,104,000 77,491,000 72,990,000 51,937,000 40,046,000 
        total assets
      2,961,681,000 2,974,805,000 2,904,848,000 2,477,868,000 2,296,277,000 2,366,958,000 1,808,980,000 1,820,224,000 1,927,667,000 2,017,100,000 2,001,779,000 1,763,712,000 1,821,720,000 1,936,054,000 1,915,310,000 1,917,018,000 1,987,591,000 1,820,455,000 1,606,130,000 904,583,000 488,588,000 477,255,000 
        liabilities and stockholders’ equity
                            
        liabilities:
                            
        payable to investors
      125,523,000 107,659,000 93,400,000 91,669,000 83,114,000 60,173,000 60,778,000 65,502,000 59,081,000 53,580,000 51,607,000 44,049,000 41,047,000 90,777,000 93,844,000 105,712,000 139,802,000 107,598,000 84,312,000 76,947,000 56,490,000 45,501,000 
        borrowings
      1,921,665,000 1,829,145,000 1,855,754,000 1,428,479,000 1,334,863,000 1,402,168,000 887,367,000 912,727,000 1,005,277,000 1,040,424,000 1,003,392,000 930,653,000 1,000,871,000 986,394,000 918,917,000 856,555,000 769,222,000 695,432,000 649,222,000 6,057,000 41,891,000 62,626,000 
        payable to securitization note holders
      39,188,000 46,542,000 55,175,000 65,152,000 75,904,000 87,321,000 100,335,000 113,652,000 129,092,000 141,416,000 153,782,000            
        accrued expenses and other liabilities
      124,591,000 171,495,000 116,250,000 126,725,000 78,680,000 133,800,000 111,616,000 77,259,000 62,055,000 71,438,000 51,853,000 47,689,000 46,991,000 66,946,000 73,647,000 75,785,000 91,723,000 103,418,000 71,951,000 70,379,000 42,869,000 35,669,000 
        operating lease liabilities
      17,548,000 21,149,000 40,551,000 43,833,000 47,074,000 50,278,000 53,348,000 56,374,000 59,364,000 62,324,000 93,354,000 96,239,000 99,050,000 100,787,000 99,418,000 99,865,000 100,051,000 100,366,000 72,175,000 17,778,000 18,621,000 19,432,000 
        total liabilities
      2,228,515,000 2,175,990,000 2,161,130,000 1,755,858,000 1,619,635,000 1,733,740,000 1,213,444,000 1,225,514,000 1,314,869,000 1,381,795,000 1,361,015,000 1,125,567,000 1,194,512,000 1,263,619,000 1,196,742,000 1,159,947,000 1,111,087,000 1,013,377,000 887,041,000 188,487,000 167,998,000 177,003,000 
        commitments and contingencies
                            
        stockholders’ equity:
                            
        common stock, 0.0001 par value...
      10,000 10,000 10,000 10,000 10,000 9,000 9,000 9,000 9,000 9,000 9,000 8,000 8,000 8,000 8,000 8,000 9,000 8,000 8,000 8,000 7,000 7,000 
        additional paid-in capital
      1,097,358,000 1,156,361,000 1,119,900,000 1,129,997,000 1,090,236,000 1,044,366,000 1,003,929,000 996,345,000 959,963,000 917,872,000 880,933,000 838,000,000 798,898,000 714,871,000 705,741,000 688,021,000 777,582,000 740,849,000 711,804,000 737,924,000 379,703,000 369,467,000 
        accumulated deficit
      -364,202,000 -357,556,000 -376,192,000 -407,997,000 -413,604,000 -411,157,000 -408,402,000 -401,644,000 -347,174,000 -282,576,000 -240,178,000 -199,863,000 -171,698,000       -21,836,000 -59,120,000 -69,222,000 
        total stockholders’ equity
      733,166,000 798,815,000 743,718,000 722,010,000 676,642,000 633,218,000 595,536,000 594,710,000 612,798,000 635,305,000 640,764,000 638,145,000 627,208,000 672,435,000 718,568,000 757,071,000 876,504,000 807,078,000 719,089,000 716,096,000 320,590,000 300,252,000 
        total liabilities and stockholders’ equity
      2,961,681,000 2,974,805,000 2,904,848,000 2,477,868,000 2,296,277,000 2,366,958,000 1,808,980,000 1,820,224,000 1,927,667,000 2,017,100,000 2,001,779,000 1,763,712,000 1,821,720,000 1,936,054,000 1,915,310,000 1,917,018,000 1,987,591,000 1,820,455,000 1,606,130,000 904,583,000 488,588,000  
        accounts payable
               12,613,000 7,027,000 6,937,000 6,553,000 18,715,000 10,916,000 22,030,000 10,289,000 6,563,000 9,381,000 17,326,000 8,127,000 13,775,000 
        beneficial interests
                36,974,000 28,664,000           
        intangible assets
                  14,562,000 15,631,000 16,700,000 17,768,000 18,837,000 19,906,000 20,975,000 22,131,000   
        retained earnings
                   -42,444,000 12,819,000 69,042,000 98,913,000 66,221,000 7,277,000    
        non-marketable equity security
                       40,000,000     
        liabilities, convertible preferred stock, and stockholders’ equity
                            
        payable to securitization note holders and residual certificate holders
                            
        convertible preferred stock 0.0001 par value...
                            
        stockholders’ equity
                            
        total upstart holdings, inc. stockholders’ equity
                           300,252,000 
        noncontrolling interests
                            
        total liabilities, convertible preferred stock, and stockholders’ equity
                           477,255,000 
      Cashflow Statements:
      Quarterly
      Annual
        Unit: USD2025-12-31 2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 
                            
          cash flows from operating activities
                            
          net income
        18,636,000 31,805,000         -28,165,000 -129,254,000  -56,223,000 -29,871,000 32,692,000     
          adjustments to reconcile net income to net cash from operating activities:
                            
          change in fair value of loans
        -30,224,000 -62,384,000 -28,126,000 7,062,000 -42,543,000 63,767,000 49,761,000 54,017,000             
          change in fair value of servicing assets
        5,851,000 4,155,000 4,550,000 4,090,000 3,652,000 4,637,000 3,915,000 4,286,000             
          change in fair value of servicing liabilities
        67,000 -386,000 -338,000 -285,000 -369,000 -60,000 -363,000 -454,000             
          change in fair value of beneficial interest assets
        -16,979,000 7,279,000 -5,884,000 -17,600,000 40,976,000 -34,758,000 3,414,000 -4,481,000             
          change in fair value of beneficial interest liabilities
        -2,234,000 6,706,000 12,172,000 -65,000 -65,000 3,289,000 4,371,000 4,973,000             
          change in fair value of other financial instruments
        -1,392,000 -3,145,000 -2,351,000 -33,000 -4,133,000 12,579,000 -5,867,000 1,551,000             
          stock-based compensation
        32,453,000 34,155,000 35,511,000 29,831,000 29,796,000 33,618,000 34,209,000 35,777,000 32,766,000 35,568,000 32,596,000 74,109,000 33,910,000 36,656,000 30,329,000 25,050,000 23,061,000 20,317,000 21,186,000 8,622,000 
          gain on loan servicing rights
        -7,627,000 -7,925,000 -7,506,000 -4,945,000 -4,001,000 -5,551,000 -2,951,000 -2,946,000             
          gain on debt extinguishment
                          
          depreciation and amortization
        6,461,000 6,131,000 5,843,000 6,400,000 4,699,000 5,390,000 4,828,000 5,632,000 9,103,000 4,934,000 4,425,000 6,441,000 3,654,000 3,724,000 3,354,000 2,781,000 2,557,000 2,185,000 1,983,000 816,000 
          loan premium amortization
        -15,589,000 -14,384,000 -10,824,000 -8,352,000                 
          non-cash interest expense and other
        3,388,000 2,216,000 1,678,000 1,325,000                 
          net changes in operating assets and liabilities:
                            
          purchases of loans held-for-sale
        -2,662,651,000 -2,440,455,000 -2,624,546,000 -1,345,253,000 -1,683,022,000 -1,056,233,000 -773,470,000 -796,543,000             
          proceeds from sale of loans held-for-sale
        2,684,771,000 2,270,958,000 2,407,037,000 1,316,696,000 1,488,898,000 1,121,045,000 719,304,000 772,690,000 639,269,000 608,754,000 817,265,000 449,339,000 5,973,626,000 220,392,000 583,835,000 50,764,000     
          principal payments received for loans held-for-sale
        49,115,000 55,407,000 44,886,000 38,252,000 35,879,000 41,675,000 62,494,000 52,841,000 50,164,000 37,753,000 43,880,000 57,949,000 47,969,000 37,259,000 46,462,000 20,328,000 4,261,000 722,000 1,039,000 2,637,000 
          principal payments received for loans held by consolidated securitization
        8,113,000 9,839,000 9,653,000 10,280,000 11,465,000 11,818,000 12,376,000 12,338,000 12,530,000            
          settlements of beneficial interest liabilities
        -5,882,000 -4,052,000 -5,672,000 -5,992,000                 
          proceeds from beneficial interest assets
        506,000 3,290,000 75,000 731,000 9,122,000 1,079,000               
          settlements of beneficial interest assets
        -2,916,000 -636,000 -538,000 -485,000                 
          other assets
        -14,656,000 -239,000 -2,373,000 6,437,000 -6,580,000 -7,832,000 6,547,000 -825,000 -8,959,000 3,853,000 -4,132,000 306,000 -4,546,000 -4,477,000 5,909,000 7,287,000 -39,236,000 -3,155,000 -9,663,000 -9,988,000 
          operating lease liability and right-of-use asset
        -1,166,000 -308,000 -304,000 -306,000 -207,000 -200,000 -198,000 -202,000 -8,385,000 125,000 222,000 1,216,000 2,509,000 2,430,000 2,681,000 2,584,000 2,098,000 580,000 214,000 234,000 
          payable to investors for beneficial interest assets
                            
          accrued expenses and other liabilities
        60,507,000 -13,410,000 41,288,000 -48,827,000 25,478,000 31,775,000 12,717,000 -25,846,000 15,692,000 4,350,000 1,284,000 -19,155,000 -5,806,000 -535,000 -13,866,000 -11,093,000 29,722,000 6,069,000 19,184,000 4,601,000 
          net cash from operating activities
        108,552,000 -122,629,000 -120,162,000 -13,486,000 -110,926,000 179,340,000 65,295,000 52,622,000 -143,712,000 -103,433,000 162,379,000 -75,727,000 -252,877,000 -101,366,000 -53,643,000 -266,795,000 -11,144,000 43,601,000 92,804,000 43,092,000 
          capital expenditures
        -3,919,000 -3,963,000 -4,251,000  -3,419,000 -2,494,000 -2,328,000 -1,749,000 -1,424,000 -2,946,000 -2,016,000 -5,458,000 -4,983,000 -5,523,000 -7,120,000 -5,287,000 -5,683,000 -5,287,000 -3,544,000 -601,000 
          free cash flows
        104,633,000 -126,592,000 -124,413,000  -114,345,000 176,846,000 62,967,000 50,873,000 -145,136,000 -106,379,000 160,363,000 -81,185,000 -257,860,000 -106,889,000 -60,763,000 -272,082,000 -16,827,000 38,314,000 89,260,000 42,491,000 
          cash flows from investing activities
                            
          purchases and originations of loans held-for-investment
        -366,978,000 -288,109,000 -228,024,000 -149,916,000 -126,516,000 -85,639,000 -64,789,000 -46,152,000             
          proceeds from sale of loans held-for-investment
        344,536,000 30,948,000 18,600,000 1,647,000     198,000    2,296,000 11,910,000       
          principal payments received for loans held-for-investment
        98,368,000 92,055,000 72,524,000 57,417,000 45,498,000 39,561,000 32,965,000 27,242,000 24,119,000 27,900,000 26,005,000 24,422,000 15,600,000 9,187,000 9,127,000 9,397,000 9,810,000 7,234,000 4,486,000 3,002,000 
          principal payments received for notes receivable and repayments of residual certificates
        10,156,000 6,374,000 3,836,000 2,685,000 1,913,000 1,323,000 1,456,000 1,225,000 772,000 560,000 1,430,000 1,566,000 1,228,000 1,596,000 1,845,000 2,067,000 2,343,000 2,766,000 3,230,000 3,119,000 
          acquisition and settlements of beneficial interest assets
        -1,830,000                    
          issuance of line of credit receivable
        -57,701,000 24,983,000 24,856,000 -23,873,000 -22,646,000               
          repayments of line of credit receivable
        2,732,000                    
          purchases of property and equipment
        -157,000 -75,000   -116,000 -37,000 -684,000             
          capitalized software costs
        -3,762,000 -3,888,000 -4,251,000 -6,159,000 -3,419,000 -2,378,000 -2,291,000 -1,065,000 -1,424,000 -2,811,000 -1,977,000 -4,347,000 -3,246,000 -4,013,000 -3,171,000 -3,658,000 -2,212,000 -2,328,000 -1,814,000 -334,000 
          net cash from investing activities
        131,738,000 -120,506,000 -109,834,000 -78,569,000 -77,909,000 -46,170,000 -76,100,000 -37,547,000 -29,893,000 -24,216,000 -38,494,000 -25,852,000 -85,113,000 -24,248,000 -9,941,000 5,177,000 -19,776,000 -84,402,000 -40,601,000 902,000 
          cash flows from financing activities
                            
          proceeds from borrowings
        81,370,000 36,492,000     173,250,000 74,260,000 97,416,000 189,124,000 279,697,000 60,673,000 258,543,000 169,071,000 181,195,000 80,004,000 712,591,000 5,831,000 
          proceeds from convertible notes issuance, net of debt issuance costs paid to lender
           490,438,000                
          payment of debt issuance costs to third parties
        -6,000                    
          repayments of borrowings
        -109,603,000 -54,803,000     -44,824,000 -110,175,000 -61,145,000 -117,148,000 -350,682,000 -46,962,000 -191,819,000 -107,466,000 -94,623,000 -6,990,000 -5,904,000 -2,957,000 -35,871,000 -26,584,000 
          payments for repurchases of convertible notes
                          
          purchase of capped calls
                         
          settlement of capped calls
                          
          principal payments made on securitization notes
        -8,569,000 -10,002,000 -10,577,000 -11,444,000 -12,663,000 -14,259,000 -14,882,000 -13,564,000             
          payable to investors
        14,259,000 1,731,000 8,555,000 22,941,000 -605,000 -4,724,000 10,821,000 6,893,000 1,930,000 5,917,000 -1,106,000 -49,730,000 -3,067,000 -11,868,000 -34,090,000 32,204,000 23,286,000 7,365,000 20,457,000 10,989,000 
          proceeds from issuance of securitization notes
                           
          net proceeds related to stock-based award activities
                            
          net cash from financing activities
        -20,183,000 378,580,000 91,928,000 -44,680,000 509,331,000 -38,021,000 132,272,000 -43,711,000 26,364,000 232,784,000 -65,851,000 20,971,000 40,531,000 41,119,000 -34,689,000 83,071,000 50,400,000 595,029,000 229,264,000 -19,261,000 
          change in cash, cash equivalents and restricted cash
        220,107,000 135,445,000 -138,068,000 -136,735,000                 
          cash, cash equivalents and restricted cash
                            
          cash, cash equivalents and restricted cash at beginning of year
                            
          cash, cash equivalents and restricted cash at end of year
                            
          supplemental disclosures of cash flow information
                            
          cash paid for interest
        8,969,000 12,404,000 14,732,000 7,378,000 8,324,000 10,285,000 12,047,000 12,463,000 14,066,000 10,241,000   4,521,000 3,876,000 2,313,000 1,763,000 478,000 269,000 1,497,000 1,030,000 
          cash paid for income taxes
        18,000 22,000 454,000 96,000 8,000 37,000 125,000 88,000 324,000 7,000   122,000 154,000 34,000 18,000 53,000 680,000   
          supplemental disclosures of non-cash investing and financing activities
                            
          beneficial interests obtained in connection with loan sales
                            
          securities retained under unconsolidated securitization transactions
        30,000,000 27,525,000                   
          capitalized stock-based compensation expense
        1,642,000 2,001,000 2,595,000 3,144,000 1,511,000 1,104,000 1,159,000 546,000 776,000 1,860,000   1,413,000 1,550,000   1,021,000 1,100,000 898,000 122,000 
          settlement of borrowings in connection with loan sale
                          
          securities retained under consolidated securitization transaction
                           
          beneficial interest assets included in payable to investors
               4,400,000             
          proceeds from issuance of common stock under employee stock purchase plan
         3,757,000 4,692,000 3,120,000 4,565,000 2,703,000 5,728,000 3,231,000 4,431,000    
          proceeds from exercise of stock options
         4,628,000 1,657,000 8,209,000 9,133,000 10,062,000 1,015,000 1,204,000 3,406,000 2,803,000 5,135,000 1,537,000 1,628,000 1,319,000 3,781,000 5,626,000 4,963,000 6,841,000 1,440,000 1,492,000 
          taxes paid related to net share settlement of equity awards
         -2,000 -2,000 -5,000 -3,000 -17,000 -1,000 -1,000 -9,000 -1,000 -5,000 -8,000      
          cash, cash equivalents and restricted cash at beginning of period
         976,263,000                 
          cash, cash equivalents and restricted cash at end of period
         135,445,000 -138,068,000 839,528,000                 
          beneficial interests obtained in connection with loan sale
         108,640,000 71,431,000 38,133,000 44,594,000 32,416,000 13,555,000             
          acquisition of beneficial interest assets
          -305,000 -38,000 -46,306,000 -16,940,000             
          payment of debt issuance costs to third party
          -443,000 -2,490,000                
          net loss
           -2,447,000 -2,755,000 -6,758,000 -54,470,000 -64,598,000             
          adjustments to reconcile net loss to net cash from operating activities:
                            
          proceeds from warehouse borrowings
           53,655,000 89,694,000                
          repayments of warehouse borrowings
           -122,285,000 -64,173,000                
          payments on beneficial interest liabilities
            -3,008,000 -1,325,000 -1,657,000 -710,000             
          purchases of non-marketable equity securities
                            
          purchase of certificates of deposit
                            
          repurchases of common stock
                    -27,813,000 -25,028,000       
          securities retained under unconsolidated securitization transaction
                            
          issuance costs of new convertible notes
            271,000                
          non-cash interest expense
             615,000 773,000 768,000 761,000 763,000 767,000 766,000 753,000 757,000 761,000 776,000     
          other
             -4,790,000 -3,545,000 -2,539,000 -1,609,000 -343,000 -943,000 -974,000         
          change in cash and restricted cash
             95,149,000 121,467,000 -28,636,000 -147,241,000 105,135,000 58,034,000 -80,608,000 -297,459,000 -84,495,000       
          cash and restricted cash
                            
          cash and restricted cash at beginning of period
             467,787,000  532,467,000  1,191,241,000    
          cash and restricted cash at end of period
             95,149,000 121,467,000 439,151,000  105,135,000 58,034,000 451,859,000  -84,495,000 -98,273,000 1,012,694,000  554,228,000   
          payments on beneficial interest assets
               -1,173,000             
          change in fair value of financial instruments
                83,505,000 52,679,000 39,592,000 59,046,000 97,822,000 21,953,000 30,747,000 18,356,000 5,611,000 -1,672,000 -5,068,000 901,000 
          accounts payable
                5,572,000 87,000 384,000 -12,170,000 8,432,000 -11,633,000 11,708,000 3,371,000 -2,957,000 -7,936,000 9,187,000 -5,807,000 
          acquisition, net of cash acquired
                        -196,000   
          proceeds from secondary offering, net of underwriting discounts, commissions, and offering costs
                          
          payment of debt issuance costs
                           
          cash and restricted cash at beginning of year
                            
          cash and restricted cash at end of year
                            
          residual certificates retained under unconsolidated securitization
                            
          issuance of common stock in connection with acquisition
                          
          gain on loan servicing arrangement
                 -3,472,000 -3,347,000 -3,613,000 -4,969,000 -6,038,000       
          purchase of loans held-for-sale
                 -826,388,000 -740,343,000 -510,003,000 -6,347,901,000 -333,763,000 -682,575,000 -443,190,000 -138,823,000 -41,994,000 -20,071,000 -18,240,000 
          purchase of loans held-for-investment
                 -37,426,000 -37,486,000 -46,382,000 -94,004,000 -41,418,000   -66,660,000 -50,190,000 -29,601,000 -12,947,000 
          acquisition of beneficial interests
                 -13,078,000           
          purchase of non-marketable equity securities
                            
          purchase of property and equipment
                 -135,000 -39,000 -1,111,000 -1,737,000 -1,510,000 -3,949,000 -1,629,000 -3,471,000 -2,959,000 -1,730,000 -267,000 
          payments made on securitization notes
                            
          beneficial interests included in payable to investors
                 1,641,000           
          net income before attribution to noncontrolling interests
                        58,944,000 29,113,000 37,284,000 10,102,000 
          incentive share expense
                            
          principal payments received for loans held by consolidated securitizations
                            
          purchase of notes receivable and residual certificates
                            
          proceeds from initial public offering, net of underwriting discounts and offering costs
                            
          payments made on securitization notes and certificates
                            
          distributions made to noncontrolling interests
                            
          proceeds from exercise of convertible preferred stock warrants
                            
          cash paid for amounts included in the measurement of lease liabilities
                    3,117,000 3,197,000       
          reclassification of common stock warrant liability related to cashless exercise
                            
          reclassification of preferred stock warrant liability related to cash exercise
                            
          reclassification of common stock warrant liability to equity upon termination of repurchase option
                            
          purchase of loans for immediate resale
                     -722,080,000 -1,782,442,000 -3,014,594,000 -2,840,488,000 -2,458,757,000   
          proceeds from immediate resale of loans
                     722,080,000 1,782,442,000 3,014,594,000 2,840,488,000 2,458,757,000   
          purchase of non-marketable equity security
                     -1,000,000     
          loss on loan servicing arrangement
                       -8,705,000     
          net increase in cash and restricted cash
                       -178,547,000 19,480,000 554,228,000 281,467,000 24,733,000 
          loss on loan servicing arrangements and sale of noncontrolling interests
                            
          gain on repurchased and retired convertible preferred stock warrants
                            
          net proceeds from sale of loans held-for-sale
                        22,032,000 33,354,000 19,043,000 38,140,000 
          net proceeds from sale of loans held-for-investment
                        40,610,000 1,075,000 1,389,000 8,329,000 
          repayments of notes payable
                            
          repurchase and retirement of convertible preferred stock warrants
                            
          repurchase and retirement of convertible preferred stock
                            
          proceeds from issuance of notes payable
                            
          proceeds from issuance of convertible preferred stock, net of issuance costs
                            
          derecognition of loans held-for-investment in consolidated vie
                            
          derecognition of payable to securitization note holders and residual certificate holders
                            
          derecognition of notes payable held in consolidated vie
                            
          transfer of notes receivable and residual certificate on deconsolidation of vie
                            
          gain on loan servicing arrangements
                         -2,121,000   
          noncash interest expense
                           18,000 
          proceeds from issuance of convertible debt
                            
          supplemental disclosures of non-cash operating activities
                            
          total right-of-use assets capitalized
                            
          gain on loan servicing arrangements and sale of noncontrolling interests
                           67,000 
          purchase of loans for immediate resale to investors
                           -1,294,634,000 
          proceeds from immediate resale of loans to investors
                           1,294,634,000 
          beginning of period
                           311,333,000 
          end of period
                           336,066,000 
          accrued interest on convertible notes
                            
          purchase of loans held by consolidated securitizations
                            
          proceeds from the issuance of securitization notes and certificates
                            
          proceeds from sale of noncontrolling interests
                            
          beginning of year
                            
          end of year