What Companies Were in Y Combinator W25?

Y Combinator W25 at a Glance

What companies were in the Y Combinator W25 batch?

This page covers 144 companies from Y Combinator Winter 2025, spanning AI infrastructure, developer tools, healthcare, fintech, robotics, biotech, construction technology, enterprise software, cybersecurity, consumer technology, aerospace, semiconductors, and other categories.

Y Combinator W25 company profiles

What industries were most common in Y Combinator W25?

Artificial intelligence was one of the defining themes of Y Combinator W25, appearing across developer tools, healthcare, fintech, legal technology, construction, robotics, manufacturing, education, and consumer applications.

The batch shows how AI was increasingly being applied to specific industries and workflows, rather than appearing only as a standalone software category.

Which Y Combinator W25 companies raised funding after the batch?

Mastra, Mentra, BlindPay, Gale, Spott, Leaping AI, QualGent, and other W25 companies showed funding activity after joining Y Combinator.

Mastra raised a $13 million seed round in October 2025. Mentra raised $8 million in July 2025. BlindPay raised $3.3 million in August 2025. Spott raised $3.2 million in May 2025, while Gale raised $2.7 million. Leaping AI also raised additional seed financing during 2025.

For GTM teams, post-batch funding can provide useful timing context because new capital may coincide with hiring, infrastructure spending, product development, and commercial expansion.

Which YC W25 companies are building AI developer tools?

Mastra, QualGent, Browser Use, ReJot, superglue, Sammy, HUD, Confident AI, Quantstruct, Lucidic, A0.dev, Subtrace, and Sparkles are among the W25 companies building developer tools or infrastructure around AI and software development.

Their products span AI-agent frameworks, browser automation, QA, LLM evaluation, data transformation, network tracing, development environments, and application generation. The category shows that W25's AI activity extended beyond end-user applications into the infrastructure developers use to build, evaluate, and operate AI systems.

Which YC W25 companies are building healthcare AI?

careCycle, Toothy AI, HealthKey, Cenote, 10x Dental, Careforce, Ruma, CareSwift, Harbera, Rada, Amby Health, and Vetnio are among the W25 companies applying AI and automation to healthcare.

Their products address workflows including patient scheduling, dental operations, clinical-trial prescreening, prior authorization, physician credentialing, insurance calls, EMS documentation, and veterinary administration. Healthcare AI represents one of the clearest vertical-AI themes within W25.

Which YC W25 companies are building fintech products?

BlindPay, Tally, Bluebook, Infinite, Tejas AI, Karsa, Mesh, and other W25 companies are building products for financial services and financial infrastructure.

Their products span cross-border payments, stablecoins, accounting automation, banking risk decisioning, tax and audit workflows, and business financial technology. The category combines traditional fintech infrastructure with newer applications of AI to accounting, banking, and risk.

Which YC W25 companies are building robotics or physical AI?

Red Barn Robotics, General Trajectory, Pave Robotics, Maritime Fusion, Orbital Operations, and Enhanced Radar are among the W25 companies building technologies that interact with the physical world.

Their products span agricultural robotics, vision-language-action models, road-maintenance automation, marine technology, orbital vehicles, and aviation safety software. The category shows that W25's technology activity extended beyond software-only products.

Which Y Combinator W25 companies show strong post-batch signals?

Several Y Combinator W25 companies showed meaningful activity after the batch through funding, hiring, product development, usage growth, and other expansion signals.

BlindPay combined new funding with more than $125 million in transfers during 2025. Mastra raised $13 million and reached 150,000 weekly downloads. Mentra raised $8 million and moved toward shipping its smart glasses. Gale raised funding and expanded its team. AfterQuery showed post-batch hiring activity.

These events provide additional context on which W25 companies continued to raise capital, expand teams, launch products, and gain adoption after participating in Y Combinator.

Why does the Y Combinator W25 batch matter?

The Y Combinator W25 batch provides a snapshot of where early-stage founders and investors were concentrating attention in early 2025, particularly across AI and industry-specific software.

AI appears throughout the batch, with companies applying it to specific workflows including healthcare administration, accounting, legal work, construction, manufacturing, sales, software testing, education, and financial services. W25 also includes companies building infrastructure beneath those applications, including AI-agent frameworks, browser automation, model evaluation, developer tooling, robotics, and data infrastructure.

For GTM teams, accelerator participation combined with subsequent signals such as funding, hiring, product launches, partnerships, and adoption can provide useful context around emerging companies entering new stages of growth.

How was this Y Combinator W25 companies list built?

This list was built using Agent Jesse, which helps GTM teams discover companies from live market activity across the web. For this page, relevant company signals include Y Combinator W25 participation, funding, hiring, product launches, partnerships, team growth, and product adoption.

Connecting accelerator participation with subsequent company activity provides additional context around which startups are raising capital, expanding teams, launching products, and gaining traction.

Frequently Asked Questions About Y Combinator W25