YC Startup Tracker

YC’s data shows a strong repeat-founder pattern, with 65 repeat founders recorded in 2025 and most returnees appearing twice, while a YC-backed startup has launched a missile-interception drone service for data centers and grid operators.

Together, the stories show YC’s network extending from repeated company-building into physical infrastructure security, though the drone offering’s testing, performance, customers, and adoption remain unestablished.

Tracking: Y Combinator

Geography: Mountain View, San Francisco Bay Area, United States

1. YC-Backed Impact Drones Launches Missile-Interception Service

Impact Drones, a Y Combinator-backed startup, has launched a service built around missile-intercepting drones, according to Data Center Dynamics. The offering is aimed at two infrastructure customer groups: data centers and grid operators.

The positioning links YC’s startup pipeline to physical security for computing and power infrastructure.

The supplied article text provides no further detail about the founders, financing, technology, operating locations, testing, pricing, or customer contracts, so it does not establish operational performance or commercial adoption.

The confirmed development is narrower: Impact Drones has launched and is offering this category of service.

Key facts:

- Impact Drones has launched a missile-intercepting drone service.

- Y Combinator backs Impact Drones.

- The service targets data centers and grid operators.

Why it matters: The launch shows a YC-backed startup pursuing protection for critical computing and electricity infrastructure, rather than a conventional software market.

If proven, a drone-interception service could give operators another defensive option, but the supplied report provides no evidence yet about effectiveness, regulatory approval, deployment, or customer uptake.

The next developments to watch are demonstrations, named customers, operating jurisdictions, and funding or partnerships. Those details would indicate whether Impact Drones is an early-stage concept or a deployable security business.

Data Center Dynamics

2. YC Recorded 65 Repeat Founders in 2025

Y Combinator’s dataset shared with Crunchbase News records 454 repeat founders and 935 founder-company records from 2005 through 2026. Repeat-founder numbers peaked at 65 in 2025, although YC cohorts expanded and recent data may be incomplete.

Most returnees made two YC appearances: 428 founders, or 94%, did so exactly twice; 25 appeared three times, and Justin Kan was the only four-time founder. The average gap was 5.1 years, but nearly 30% returned within two years, including 38 in the same calendar year.

Aaron Epstein says repeat founders use YC’s advice and network more efficiently, avoid premature hiring and spending, and increasingly return as solo founders supported by existing networks.

Key facts:

- YC’s dataset includes 454 repeat founders and 935 founder-company records from 2005–2026.

- 428 founders, or 94%, participated in YC exactly twice.

- Repeat-founder numbers peaked at 65 in 2025.

- The average gap between YC appearances was 5.1 years.

- Justin Kan was YC’s only four-time repeat founder.

Why it matters: The figures show YC becoming a recurring resource for some founders, not simply a one-time launchpad.

A growing alumni base naturally creates more people eligible to return, while experienced participants may know how to use YC’s advice, network and resources with less wasted effort. The operating model is also shifting.

Epstein says repeat founders are more likely to avoid premature hiring and spending, and some now start solo while relying on established networks for early employees.

He sees AI accelerating this leaner path, but the 2025 peak should be interpreted cautiously because cohort formats changed and recent data may be incomplete.

Crunchbase News