Y Combinator Winter 2026: startups chasing $100M valuations

Earlier this week, Y Combinator hosted its Winter 2026 Demo Day (an accelerator pitch event), showcasing a batch marked by rising valuations and a strong focus on revenue milestones. While the accelerator has historically produced some of the world’s largest tech companies, this quarter’s default valuation seems to be around $30 million. However, the most sought-after startups are commanding much higher prices. At least a couple of startups have reportedly raised funds at a $100 million price tag, though these companies are already bringing in run-rate revenue of $1 million or more.

The following startups from the batch attracted significant investor interest:

• Beyond Reach Labs: Building deployable solar arrays for satellites, the startup claims its system can increase available power tenfold while slashing costs by 88%. It has a flight planned for 2027 and has secured $325 million in letters of intent (non-binding agreements).
• Byteport: Developing a fast file transfer protocol, founder Jayram Palamadai claims its DART protocol can transfer files at an average of 10x faster than TCP, and up to 1,500x faster on reliable connections.
• GRU Space: Building lunar infrastructure and a moon hotel, founder Skyler Chan—who previously built software at Tesla and worked on NASA-funded space tech—plans to build a luxury hotel on the moon by 2032. The startup has secured $500 million in letters of intent (non-binding agreements).
• Hex Security: To combat “hackers using AI to launch nonstop cyberattacks”, the startup builds AI-powered security testing tools. Hex claims it can prevent attacks at a fraction of the cost and has crossed run-rate revenue of more than $1 million.
• GrazeMate: Building autonomous drones for cattle herding, the startup aims to simplify what has historically been an “expensive and dangerous undertaking”. The founder grew up on a 6,000-head cattle station in Australia.
• Luel: Building a marketplace for human-captured data, the startup is reportedly generating ARR (annual recurring revenue) of nearly $2 million.
• Pax Historia: Building an AI-powered strategy game where players can explore scenarios like the USA taking over Greenland. The game attracts 35,000 daily users who have played nearly 20 million rounds.
• Stilta: Building agentic AI (AI systems that can perform tasks autonomously) for patent lawyers to reduce the cost of patent disputes, which can run up to $4 million per case. Stilta’s AI agent can search and analyze patents to save time and legal fees, and is already used by pharmaceutical giant Roche. The founders hail from Sweden.

This high-performing batch has intensified competition among venture capitalists. For highly sought-after startups like Hex Security, which reached its revenue milestone in just eight weeks, one investor noted that venture capitalists “were fighting” to secure allocation.

Why it matters

Investors use Y Combinator’s Demo Days to identify promising startups, with this batch showing a trend of higher valuations and specific revenue milestones for the most sought-after companies.