Rebellionaire sits down with Paul Gu — Upstart co-founder, AI architect, and incoming CEO — to talk model upgrades, product expansion, insider buying, and why the best is still ahead. The Man Behind the Models Paul Gu doesn't do things for optics. That's one of the first things you pick up when you talk to him. He co-founded Upstart in 2012 alongside Dave Girouard, and for the past 14 years he's been the person most responsible for the AI and machine learning that makes the whole thing work....

Upstart grew originations 86% in 2025, flipped to profitability, crushed the balance sheet concern, and just handed the keys to co-founder Paul Gu. The stock dropped 25%. Here's why the fundamentals have never been stronger — and why the selloff might be creating a massive asymmetric opportunity. The Quarter That Was Supposed to Break the Thesis Heading into Q4, Upstart had every chance to disappoint. After a confusing Q3 that involved a macro-driven tightening credit box, a ballooned balance...

Upstart’s stock is still being judged like it’s 2022. The business isn’t. That disconnect is the entire setup going into Q4 earnings. This article summarizes original Rebellionaire research based on proprietary indicators and first-party data analysis. What is this report about? This report analyzes Upstart’s Q4 2025 earnings with a focus on whether the company is still a balance-sheet lender or in an intentional AI incubation phase. It examines funding structure, model behavior, macro...