Y Combinator Winter 2026 (W26) Companies

Bubble Lab provides a platform for managing online communities that consolidates applications, payments, member directories, events, and messaging into a single interface. It integrates with Slack and other communication tools to handle member onboarding, matchmaking, and community analytics.

1 investor

Burth builds AI coworkers for logistics teams that automate daily operational tasks like track and trace, quoting, and proof-of-delivery management while integrating with existing systems and processes.

1 investor

Button manufactures an AI-powered wearable device that activates only when a user presses a physical button, avoiding always-on listening. The device connects via Bluetooth to a smartphone and provides instant voice responses.

1 investor

Byteport provides data transfer infrastructure for high-performance networks, specializing in rapid and reliable file movement between any source and destination across demanding environments including AI clusters, satellite ground stations, and defense networks.

1 investor

Tau provides formal verification of compiled binaries by generating mathematical proofs of correctness or identifying bugs, addressing risks from AI-assisted code generation and complex software systems.

1 investor

Canary is an AI-powered testing platform that automatically generates and executes comprehensive test cases across an application's user journey for development teams. It supports flexible deployment options including cloud, self-hosted, and on-premises configurations.

1 investor

Captain builds infrastructure that makes unstructured enterprise data searchable and accessible through an Agent Swarm approach, serving large organizations that need to query and explore data at scale.

1 investor

Cardboard is an AI-powered video editing platform that automatically finds key moments in footage, generates captions and dubbing, and produces multi-format videos optimized for different platforms. It serves content creators and video production teams who need to reduce editing time.

1 investor

Cardinal is an AI agent platform for sales and go-to-market teams that integrates with existing tools and processes rather than replacing them. The company combines software with managed services to implement AI agents while maintaining team performance and system quality.

3 investors

Caretta is a real-time sales AI assistant that helps salespeople conduct technical and product-focused conversations during sales calls by pulling from internal documentation, knowledge sources, and organizational data. It integrates with CRM systems, collaboration tools, and other sales platforms to provide call notes and updated customer information.

3 investors

SuperPenguin provides AI spend tracking and cost attribution software that monitors expenditure across AI models, customers, and product features. The platform integrates with major AI providers to deliver dashboards, invoice reconciliation, and cost alerts for engineering teams and finance organizations.

1 investor

Cascade enables companies to fine-tune AI models using their own data and processes to generate higher-quality results at lower cost. The platform serves enterprises seeking to deploy custom machine learning models optimized for their specific business needs.

1 investor

CatchBack Cards is a platform where collectors design and open digital card packs with customizable contents and odds, receiving corresponding physical cards in the mail and accessing buyback offers and a marketplace for trading.

1 investor

CellType uses AI agents and biological models to automate drug discovery, having identified a novel cancer treatment signal and partnering with major pharmaceutical companies.

3 investors

Chamber builds GPU infrastructure software that provides visibility and enables sharing of idle GPU capacity across teams. The platform helps AI/ML teams run more workloads and experiments on their existing GPU investments.

3 investors

Chasi provides AI software to equipment dealers and rental companies to automate administrative tasks and improve asset utilization in the construction and industrial equipment sector.

1 investor

ClaimGlide develops AI-powered software that automates the prior authorization process for healthcare providers, handling creation, submission, follow-up, and appeals to increase approval rates and reduce manual work.

1 investor

CodeWisp is a platform that generates web games from natural-language descriptions, allowing users to create and publish games through iterative prompts without game development expertise.

1 investor

Cofia provides AI-driven automation software that analyzes internal business processes and automatically deploys workflows that deliver the highest return on investment.

4 investors

Compresr is a prompt compression platform that reduces token usage in LLM queries by keeping relevant context and dropping irrelevant data, cutting costs and latency by up to 90%. The service works with any large language model and offers both cloud SDK and on-premises deployment options.

1 investor

Condor provides an operating system for enterprise energy management, helping organizations monitor, forecast, and optimize energy procurement and consumption using AI-driven strategies. The platform aggregates metering data, power purchase agreements, renewable assets, and market data to reduce costs and manage price risk across multiple sites.

3 investors

Confluence Labs is an AI research lab developing models that improve learning efficiency, enabling faster scientific discovery with minimal experimental data. The company focuses on accelerating breakthroughs in drug and materials discovery by reducing the number of experiments needed to achieve results.

1 investor

Congruent provides a radar system with digital-twin capabilities that enables end-to-end autonomous vehicle training using raw radar data—both real and synthetic. The platform allows developers to record real data, augment scenes in their world model, and generate synthetic data for testing edge cases and closed-loop evaluation.

2 investors

Constellation provides an operations platform designed for satellite fleet management that ingests telemetry data, executes machine learning predictions, and automates decision-making based on operator policies.

1 investor