Y Combinator analysis reveals a growing repeat founder trend. Dataset of 454 repeat founders (935 records, 2005-2026) shows 94% (428) went through exactly twice, 25 three times, Justin Kan sole four-time founder. Average return gap 5.1 years, but 30% within two years, 61 after decade+. Repeat founders peaked at 65 in 2025.

Aaron Epstein, YC general partner, confirms trend but notes growing alumni base naturally increases eligibility. Second-time founders better utilize program resources, avoid overhiring pre-product-market fit. Many start solo, leveraging networks and AI tools to build leaner, faster — Epstein compares shift to cloud computing eliminating server costs.

Example: Sherwood Callaway, founder of Opkit (YC S21, acquired by 11x AI), returned for Sazabi, an AI-native observability platform. First venture was "MBA case study"; second aligns with passions and expertise. Callaway strategically deferred batch to build product first, using YC as go-to-market acceleration. Noted more experienced cohort and AI-era concerns.