Y Combinator Founders Are Building Brands on New Extensions

Y Combinator has funded more than 5,000 companies since 2005, including Airbnb, Stripe, and Dropbox. The founders it accepts tend to be early movers who define patterns others follow. An analysis of YC cohort data from 2020 through early 2026 shows a consistent, measurable shift in how those founders choose a domain: new top-level domains are the majority choice, and the trend has held across three consecutive years of cohort data.

Y Combinator founders have shifted to new extensions.

In 2020, 39% of YC startups used an nTLD domain. By early 2026, that number had increased to 51%. A majority of the most carefully selected founders in technology are now choosing a new extension.

These founders have access to experienced advisors and every incentive to make the right call on brand identity from day one. When more than half of them are choosing an nTLD, it’s a pattern that should be taken seriously.

.ai leads new extensions among YC founders.

Among nTLDs, .ai has seen the most significant growth. Its share among YC startups rose from 8% in 2020 to a peak of 30% in 2025. The growth reflects a specific strategic logic. A domain like brand.ai communicates what a company builds before a visitor reads a word of copy. For founders trying to establish credibility instantly, that is a meaningful advantage built into the address itself.

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Exact brand match is now the norm among nTLD founders.

87% of YC startups using nTLDs in early 2026 secured their exact brand name as their domain. That figure held between 80% and 92% every year from 2020 through 2026.

This consistency across six years is the real story. Founders who choose an nTLD are not making a compromise on brand precision. They are pairing the exact name they want with an extension that communicates what they build. That brand precision has been the norm among YC nTLD users since 2020.

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YC’s domain choices point to where startup branding is headed.

YC has a documented history of setting practices the broader market eventually adopts. The founders in its cohorts are strategically advised, making deliberate choices with significant capital behind them. 

When founders at this level consistently move in a new direction, it spreads to startups that look up to them and to the industries they disrupt. YC has a long history of setting practices the broader market eventually adopts. Domain strategy may be the next one.

The next generation of iconic brands is already choosing its domain.

The startups being built on these extensions today are still early in their stories. Some will become the defining companies of their generation. When that happens, the domain they launched will be part of the brand identity they carry forward. The startups choosing nTLDs today are the established brands of tomorrow.