小蓝视频色情网页版

Startup accelerator has long had a reputation for spotting exceptional first-time founders before anyone else. Lately, 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, 小蓝视频色情网页版 News analyzed a dataset of repeat founders who have gone through YC鈥檚 cohorts. That analysis revealed some very interesting insights. 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. and co-founder was the sole four-time founder.

Other highlights: 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 鈥� including 38 in the same calendar year 鈥� 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 , and , as well as and .

A trend YC partners are watching closely

, 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 鈥渁 bunch of repeat, second-time founders鈥� he’d worked with before 鈥� several during their previous YC company.

鈥淚t definitely feels like more of a trend now,鈥� Epstein said. Still, he’s careful not to overstate the novelty.

鈥淚t’s not a new thing. But the alumni base of past YC founders continues to grow,鈥� he said in an interview with 小蓝视频色情网页版 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 (YC W10), a marketplace for graphic design assets that he sold to 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.

鈥淭hey know exactly how to get the most out of the advice, network and resources available to them,鈥� he said. 鈥淗aving been through the startup grind, they get really good at focusing on the signal that matters and cutting out the noise.鈥�

That experience also helps them avoid a specific, costly mistake.

鈥淭he biggest mistake I see second-time founders avoid is overhiring or overspending pre-product-market fit,鈥� Epstein said. 鈥淭he 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.鈥�

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.

鈥淪ome of them (repeat participants) are solo founders, but they’re not building alone,鈥� Epstein said. 鈥淭hey already have networks of people they can bring in as founding employees. This helps them move faster, and feels more fun and less lonely.鈥�

He compares this shift to how cloud computing eliminated the need for startups to raise large sums just to pay for servers.

鈥淚t 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,鈥� he said.

AI is accelerating that shift, and Epstein sees it pulling former company builders, including himself and YC CEO , back into hands-on product work.

鈥淚t’s so easy to get back into it and start building again. And it’s incredibly exciting,鈥� he said. That mix of hard-won product sense and new tooling, he believes, is changing what one person can build alone.

鈥淭hey actually become the people that can produce at 10x or 100x what a traditional engineer would be able to build,鈥� he said.

As an example, Epstein pointed to , a founder he first worked with on in 2020 who’s now building 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.

鈥淭he pressure cooker environment of the batch, which pushes them to move even faster, and distribution to thousands of companies within the network,鈥� he said. 鈥淚t’s extremely hard to replicate those things on your own.鈥�

From Opkit to Sazabi

One of the repeat founders Epstein has worked with is , whom YC has now backed twice.

Callaway’s path to Silicon Valley began almost by accident. As a college sophomore, he skipped a lined-up investment banking internship after reading about a software bootcamp in San Francisco 鈥� a decision he calls 鈥減robably the single most important鈥� of his life.

From then on, his goal was clear: 鈥淚 wanted to do my own venture-backed tech startup, and I wanted to do a YC venture-backed tech startup.鈥�

After gaining experience at and fintech , he founded his first company, , in YC’s fully-remote summer 2021 batch. Opkit was a healthcare-fintech startup building insurance verification and revenue-cycle-management software.

鈥淚t was, in retrospect, not the right thing for me to be working on, but a really fun and interesting and rewarding first venture,鈥� he said in an interview. Opkit was later acquired by .

That experience shaped his second company, , a name chosen deliberately in contrast to Opkit.

鈥淥pkit wasn’t very personal to me. It was more of an MBA case study approach to starting a business,鈥� he said. 鈥淲ith Sazabi, it needs to really be in alignment with who I am and my passions and interests.鈥�

Sazabi, an AI-native observability platform competing with incumbents like , draws directly on work Callaway has done throughout his career 鈥� a return, in his words, to 鈥渨hat I know best.鈥� He sees it as part of a common pattern: First-time founders often avoid building in the field they know best, then return to it with their second company.

Callaway hadn’t originally planned to go through YC again, and the reconnection happened almost by chance through an email that looped in his former partner on Opkit, Epstein. Once Callaway decided to return, he was more strategic about timing, even deferring his batch to build out more of the product first.

鈥淚 wanted to use YC as a go-to-market acceleration event,鈥� he said, something he likely wouldn’t have known to do without having gone through the program before.

The founder was back at YC in person for the first time this spring. He described the second-time experience as something entirely new: 鈥淚t was really something special.鈥�

This time around, Callaway also noticed a more experienced cohort than his own first batch, along with new concerns specific to the AI era. 鈥淭here’s a lot of anxiety around what the durable moat is in an AI world when lines of code are effectively free,鈥� he said.

On fundraising, he drew a pointed comparison to 2021. 鈥淪pring 2026 felt similar to fall 2021,鈥� he said, 鈥渂ut unlike 2021, where interest rates and ZIRP drove a lot of that energy, in 2026 it’s driven by AI and by real material gains.鈥�

The company鈥檚 thesis is resonating with investors. In late June, Sazabi announced an $8 million seed round led by , and Y Combinator, with participation from and more than 60 angels from companies including , and .

鈥淎I has changed how software gets written. Now it is changing how software gets operated,鈥� Callaway said. 鈥淪azabi is rebuilding observability from first principles for a world where agents are part of every engineering team.鈥�

Overall, as AI continues to lower technical barriers and YC’s alumni pool keeps growing, second-time founders like Callaway are becoming an increasingly visible part of the accelerator’s lineup.

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