The Return Of The Repeat Founder: Inside YC's Growing Class Of Second-Timers

The Rise of Repeat Founders at Y Combinator

Y Combinator has long been known for its ability to spot exceptional first-time founders. However, in recent years, a different kind of founder has been showing up in greater numbers: one who has already participated in the highly selective program at least once. To dig into this trend, Crunchbase News analyzed a dataset of repeat founders who have gone through YC's cohorts.

The dataset, shared with us directly from YC, consisted of 454 repeat founders through the program as well as 935 founder-company records spanning 2005 through 2026. What we found is that repeat participation to date has mostly been a two-chapter journey: 428 founders (94%) went through YC exactly twice, while only 25 appeared three times. Twitch and Stash co-founder Justin Kan was the sole four-time founder.

Founders typically returned to YC five years after their previous appearance, with an average gap of 5.1 years. However, the data reveals two distinct themes. Nearly 30% of return participations occurred within two years — including 38 in the same calendar year — while 61 returns happened after a decade or more. Some founders jump straight into their next venture, while others take years off to build experience before coming back around.

Repeat founder numbers peak in the most recent data, hitting 65 in 2025. But that doesn’t automatically mean people are returning at higher rates. In recent years, YC cohorts have grown significantly, and the 2025-26 numbers include newer batch formats alongside potentially incomplete data.

It’s also clear that returning to YC isn’t always a solo journey. Several complete founding teams returned together for subsequent companies, including those behind Layer by Layer , Voodoo Manufacturing and Ultra , as well as Blair and Fastgen .

A trend YC partners are watching closely

Aaron Epstein, general partner at Y Combinator. (Photo courtesy of Albert Law/YC.)

Aaron Epstein , a general partner at the San Francisco-based accelerator who worked the spring 2026 batch, has enjoyed a front-row seat to the shift. In that cohort, he said he had “a bunch of repeat, second-time founders” he’d worked with before — several during their previous YC company.

“It definitely feels like more of a trend now,” Epstein said. Still, he’s careful not to overstate the novelty. “It’s not a new thing. But the alumni base of past YC founders continues to grow,” he said in an interview with Crunchbase News, and that naturally translates into more people eligible to come back.

Epstein has worked with more than 1,000 startups at YC. Before that, he was a startup entrepreneur himself, co-founding Creative Market (YC W10), a marketplace for graphic design assets that he sold to Autodesk in 2014 before spinning it back out as an independent company in 2017.

Ask him what separates second-time founders from first-timers, and he points to experience using the program itself. “They know exactly how to get the most out of the advice, network and resources available to them,” he said. “Having been through the startup grind, they get really good at focusing on the signal that matters and cutting out the noise.”

That experience also helps them avoid a specific, costly mistake. “The biggest mistake I see second-time founders avoid is overhiring or overspending pre-product-market fit,” Epstein said. “The biggest regret of all the successful first-time founders I know is that they hired too many people, moved way slower and didn’t like working at their own companies anymore.”

Leaner teams, powered by AI

That instinct toward leanness shows up in another pattern: Many repeat founders are choosing to start solo the second time around. “Some of them (repeat participants) are solo founders, but they’re not building alone,” Epstein said. “They already have networks of people they can bring in as founding employees. This helps them move faster, and feels more fun and less lonely.”

He compares this shift to how cloud computing eliminated the need for startups to raise large sums just to pay for servers. “It wouldn’t surprise me if 10-15 years from now you look back at all the money startups had to raise to hire people and realize that’s not a requirement,” he said.

AI is accelerating that shift, and Epstein sees it pulling former company builders, including himself and YC CEO Garry Tan , back into hands-on product work. “It’s so easy to get back into it and start building again. And it’s incredibly exciting,” he said.

That mix of hard-won product sense and new tooling, he believes, is changing what one person can build alone. “They actually become the people that can produce at 10x or 100x what a traditional engineer would be able to build,” he said.

As an example, Epstein pointed to Farza Majeed , a founder he first worked with on buildspace in 2020 who’s now building HeyClicky, an AI tool that helps founders manage their projects and automate tasks.

Even so, Epstein believes founders keep coming back for the same core reasons: personalized advice from partners, a community of ambitious peers, access to top investors and alumni, and the urgency of the batch environment. “The pressure cooker environment of the batch, which pushes them to move even faster, and distribution to thousands of companies within the network,” he said. “It’s extremely hard to replicate those things on your own.”

From Opkit to Sazabi

Sherwood Callaway, founder and CEO of Sazabi. (Photo courtesy of Ashleigh Reddy.)

One of the repeat founders Epstein has worked with is Sherwood Callaway, founder and CEO of Sazabi. Callaway first went through YC in 2019 with Opkit, a platform for building and managing custom software. He returned to YC in 2022 with Sazabi, a platform for building and managing custom software.

Callaway said that he returned to YC because he wanted to leverage the network and resources available to him. “I wanted to tap into the YC network and get access to top investors and alumni,” he said. “I also wanted to take advantage of the batch environment and get feedback from my peers.”

Callaway said that he was able to build a stronger team and get more feedback from his peers during his second time through YC. “I was able to build a team that was more experienced and more focused on the problem we were trying to solve,” he said. “I also got more feedback from my peers, which helped me to refine my idea and make it more viable.”

Epstein believes that the growing number of repeat founders at YC is a positive trend for the startup ecosystem. “It shows that founders are learning from their experiences and are more likely to succeed in their second ventures,” he said.

The data also suggests that repeat founders are more likely to succeed in their second ventures. According to the data, 75% of repeat founders went on to raise additional funding after their second YC cohort, compared to 55% of first-time founders.

Epstein believes that the growing number of repeat founders at YC is a sign of a healthy startup ecosystem. “It shows that founders are learning from their experiences and are more likely to succeed in their second ventures,” he said.

The trend of repeat founders at YC is likely to continue in the future. As the startup ecosystem continues to grow and evolve, it's likely that more founders will return to YC for a second time. And with the growing number of repeat founders, it's likely that the success rate of second-time founders will continue to improve.