Upstart Investors Sue Over an AI Model That Quietly Rejected Borrowers

Shareholders of Upstart Holdings, Inc. filed a securities class action lawsuit on April 7, 2026, alleging the company misled investors about the performance of its Model 22 AI lending model, which the company said had overreacted to negative macroeconomic signals and reduced borrower approvals. The lawsuit, Dunn v. Upstart Holdings, Inc., names CEO Dave Girouard, CFO Sanjay Datta, Paul Gu, and Chantal Rapport as defendants, and covers purchases from May 14 to November 4, 2025, when Upstart reported Q3 revenue of $277 million, below its $280 million guidance, and cut full-year revenue guidance to about $1.035 billion, causing the stock to fall 9.71% to $41.75. Despite the legal challenge, Upstart reported full-year 2025 revenue of $1.0 billion, up 64% from 2024, and Q1 2026 revenue of $308 million, up 44% year over year.

Upstart's Model 22 problem is now more than a bad quarter. Shareholders say the company sold Wall Street a cleaner AI story than the one its own numbers could support. The lawsuit against Upstart Holdings turns on a blunt question: what did the company know about Model 22 before investors found out the hard way? Upstart launched the lending model in May 2025 and spent the year presenting it as a better way to approve borrowers. Then came November. Revenue missed, guidance came down, and the company said the model had been too cautious when reading the economy. That is the whole fight. Not whether AI can underwrite loans. Not whether Upstart had a weak quarter. Investors who bought Upstart shares from May 14 to November 4, 2025 say the company overstated Model 22's accuracy and its ability to raise approval rates while the model was already cutting into revenue. The complaint is specific According to case summaries published by Kessler Topaz Meltzer & Check, Robbins LLP, Levi & Korsinsky and other firms soliciting investors, the securities class action names Upstart, Dave Girouard, Sanjay Datta, Paul Gu and Chantal Rapport as defendants. Justia's docket for Dunn v. Upstart Holdings, Inc. shows the case was filed on April 7, 2026 in the Northern District of California. The lead plaintiff deadline was June 8, 2026. The numbers are not vague. In February 2025, Upstart guided investors to roughly $1 billion in full-year revenue. In August, it raised that outlook to about $1.055 billion, including about $990 million in fee revenue, with the complaint saying the company credited improvements tied to Model 22. Then, on November 4, Upstart reported third-quarter revenue of $277 million, below its $280 million guidance, and cut full-year revenue guidance to about $1.035 billion. The stock took the hit. It fell $4.49 a share, or 9.71%, and closed at $41.75 on November 5, according to the investor notices from Levi & Korsinsky and Pomerantz. Upstart's own explanation made the story worse for shareholders. The complaint summaries say the company told investors Model 22 had overreacted to negative macroeconomic signals, reducing borrower approvals and conversion rates. They also say the company acknowledged it had knowingly calibrated the model to be more conservative on credit earlier in the quarter. That admission matters. Missing guidance is common. A model quietly rejecting more borrowers while the company is telling investors the model is improving approval performance is the part plaintiffs are now pressing in court. The real story here is disclosure That's what makes the Upstart case useful well beyond Upstart. Most corporate AI risk still arrives as soft language in annual reports: model risk, data risk, regulatory risk, the kind of paragraph investors skim because every company sounds the same. This one has a date, a model name, a revenue guide and a stock drop. You can see the practical problem. If a lender tells Wall Street that its proprietary model is approving more good borrowers, investors have to trust that management can actually see what the model is doing in real time. If the model is overreading macro signals and pulling back credit, that is not a small technical footnote. It goes straight to revenue. Upstart has not disappeared into the lawsuit. In February 2026, the company reported full-year 2025 revenue of $1.0 billion, up 64% from 2024, and net income of $53.6 million. In May 2026, it reported first-quarter revenue of $308 million, up 44% year over year, with roughly $3.4 billion in total originations. Upstart also said it still expected about $1.4 billion in total revenue for 2026. So there are two stories running at once. The business has recovered from the November stumble. The legal question has not gone away. That distinction is important for any fintech founder selling investors on a model. Better results later do not answer what investors were told earlier. The plaintiffs' case is about the gap between the Model 22 story Upstart put in front of the market in 2025 and the credit behavior the company later described after the quarter had already gone wrong. There is also fresh regulatory context. On July 23, 2026, Upstart said the Office of the Comptroller of the Currency had granted conditional approval for the company to establish Upstart Bank. That puts even more attention on how clearly the company explains the systems behind its lending decisions. You do not get to make AI the core of the pitch and then treat model behavior as a black box when the numbers miss. For investors, the lesson is plain enough. When a company says its AI model is driving approvals, revenue and guidance, you should ask what happens when the model gets scared. Upstart's shareholders are asking that question in federal court now. Also read: WLFI's Largest Token Unlock Yet Floods 6.9 Billion Coins Onto the Market https://startupfortune.com/wlfis-largest-token-unlock-yet-floods-69-billion-coins-onto-the-market/ • Barrick Picks Its Two New CEOs as the Gold Miner's Breakup Nears https://startupfortune.com/barrick-picks-its-two-new-ceos-as-the-gold-miners-breakup-nears/ • Supermicro Shares Jump 8% as Margins Nearly Double Despite a Revenue Miss https://startupfortune.com/supermicro-shares-jump-8-as-margins-nearly-double-despite-a-revenue-miss/