By - Y Combinator’s Winter 2026 batch featured nearly 190 startups at Demo Day on March 25–26, 2026, the largest and fastest-growing cohort in YC history.
- 3x more companies hit $1 million in annualized revenue compared to the Winter 2025 batch, according to YC president Garry Tan.
- Average week-on-week revenue growth across the batch hit 14% — the highest growth rate ever recorded for a YC cohort.
- AI dominated every category, from humanoid robot training to medical translation to drone radar, across 16 highlighted startups.
YC W26 Demo Day just broke every record in Y Combinator history. Nearly 190 startups pitched on March 25 and 26, 2026, and the numbers were stunning.
Garry Tan, YC’s president, said three times more companies hit $1 million in annualized revenue compared to last winter’s batch. That is the highest count of early-stage $1M ARR companies YC has ever seen at a Demo Day.
YC Demo Day for W26 is in full swing The craziest stat: 3X more companies in this batch reached $1M annualized revenue than W25 Also crazy: the fastest revenue growth rate of YC history at 14% week on week growth *on average* across the whole set of nearly 200 startups
— Garry Tan (@garrytan) March 25, 2026
The Fastest-Growing Y Combinator’s Batch on Record
The W26 cohort posted 14% week-on-week revenue growth on average — across nearly 200 companies. That is not a typo.
Week-on-week growth means how fast revenue rises every single week. A 14% average across an entire batch is extraordinary. Most fast-growing startups aim for 5–10% weekly growth.
The W26 batch is 64% B2B — meaning the startups sell to businesses, not consumers. That has historically been the sweet spot for revenue and scale. Infrastructure, robotics, and AI tooling dominate the mix.
16 Standout Startups From the YC W26 Demo Day
TechCrunch highlighted 16 companies from the batch. The list shows how broad AI applications have become. Every category had an AI angle.
Asimov trains humanoid robots by recording and analyzing human movement data. Button Computer is building a wearable AI device. Opalite Health uses AI to translate medical information for non-English speakers, targeting a huge gap in healthcare access.
Doomersion teaches users new languages through short videos as they scroll social media. Crosslayer Labs detects spoofed websites. Milliray is building drone-tracking radar for defense and airport use. Sonarly automatically detects and fixes production software issues.
AI Infrastructure Takes Center Stage
Beyond individual startups, the Y Combinator’s W26 Demo Day showed a clear trend: AI is moving from demos to real infrastructure that companies pay for.
MouseCat uses AI to investigate fraud cases. Terranox AI detects uranium deposits using machine learning. Lexius brings AI to physical security monitoring. These aren’t flashy consumer apps — they are tools that solve expensive, real-world problems.
Defense and deep tech are no longer fringe interests at YC. They are now central to the program. The batch also includes CodeWisp for AI-powered game creation and ShoFo for video library indexing and search.
What Investors Are Watching After YC W26
The strong revenue numbers mean these startups approach investors from a position of strength. They don’t need capital to survive, they want it to grow faster.
With 14 companies already at $1 million ARR and 14% weekly growth across the batch, the Y Combinator’s W26 Demo Day class will draw serious attention from top-tier venture funds. Seed rounds will likely close fast and at high valuations.
AI infrastructure, medical AI, and defense tech appear to be the three areas where investors will move quickest. Watch for funding announcements over the next four to six weeks as founders close their first institutional rounds and begin scaling well beyond the YC network.
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