Y Combinator Spring 2026 (X26) Companies

Oddpool provides a search engine and data API for prediction markets, aggregating market data, orderbooks, and trading signals across Kalshi and Polymarket. It serves traders, quant teams, and developers with unified access to 700,000+ markets, historical data, whale tracking, and arbitrage detection.

1 investor

Ontora provides an AI agent that conducts parallel interviews with employees across an organization to map business processes and identify bottlenecks in operations, sales, and finance. The platform accelerates process discovery and operational transformation by extracting undocumented workflows from employee knowledge.

1 investor

OpenProse is a declarative language and framework for orchestrating multi-agent AI workflows, allowing developers to write contracts in Markdown that compile into executable topologies for coordinating AI agents running on Claude, Codex, or other language models.

1 investor

OpenWork is a desktop application that provides access to 50+ large language models with the ability to bring custom API keys and share configurations with team members. The platform integrates with multiple AI coding tools and agents through Model Context Protocol (MCP) servers.

1 investor

Ornadyne makes flapping-wing unmanned aircraft designed to resemble birds for covert reconnaissance missions. The company addresses limitations of conventional drones by engineering systems optimized for stealth, endurance, and autonomous operation in field environments.

1 investor

Pairio is an AI assistant that helps industrial maintenance teams document work, search technical documentation, analyze maintenance data, and create work instructions. It serves mid-sized to large enterprises in machinery, production, and plant operations.

1 investor

Panacea provides FDA regulatory consulting and approval services for medical device and diagnostic companies, combining ex-FDA expertise with AI-powered technology to accelerate the regulatory pathway from strategy to market approval.

2 investors

Parrot is an all-in-one management platform for auto repair shops that combines CRM, estimation, parts procurement, insurance claim management, payroll, and tax filing. The platform uses AI and voice agents to automate administrative tasks such as supplier calls, insurance follow-ups, estimate auditing, and invoicing for repair shop owners.

1 investor

Pavoot is an AI-powered platform that automates event management for field marketing and sales teams, handling attendee sourcing, personalized invitations, RSVP tracking, on-site capture, and follow-up workflows. The platform serves B2B event organizers and sales teams across conferences, summits, and corporate activations.

1 investor

Pentagon is a workspace platform that enables AI agents to communicate, coordinate, and collaborate as a team to complete work. The product serves organizations deploying multiple AI agents that need structured coordination, task management, and human oversight capabilities.

1 investor

Perfectbit generates high-quality, information-dense synthetic data for AI model training using formal proof systems, simulators, and executable tests rather than human annotation. The company serves foundation model developers and AI teams seeking to improve model performance through trustworthy, physics-informed data.

3 investors

Plan0 provides AI-powered cost estimation and scenario simulation tools for real estate construction and design, serving developers, general contractors, and investors to accelerate project underwriting and planning decisions.

1 investor

Playabl.ai is a platform where users can create, publish, and monetize games that other users can play and share, similar to a social network for game creation.

1 investor

Plena Health provides software that automates administrative tasks for specialty medical practices, including referral handling, intake processing, scheduling, compliance management, and billing across existing practice systems. The platform integrates these workflows across a practice's entire operation rather than addressing isolated functions.

1 investor

Ploy builds account plans for sales and marketing teams targeting high-intent accounts through coordinated multi-contact email outreach. The platform identifies and verifies contact rosters, generates role-aware Gmail drafts, and provides paced send schedules for coordinated account-based outreach.

3 investors

Pops is a platform for casual and arcade-style games where creators can compete for weekly prizes within a community. The platform hosts multiple game categories ranging from arcade and 3D games to puzzles, sports simulations, and party games.

1 investor

Primitive provides email and agent infrastructure for autonomous software agents, enabling agent-to-agent communication and inbound message handling through managed email addresses, hosted functions, and webhooks. The platform serves developers and AI agents by offering email as a transport layer for autonomous systems without requiring dedicated mail servers or domain management.

1 investor

Prism operates a recruiting agency that uses AI agents and software to help companies identify job candidates more quickly.

1 investor

Infinity provides a cloud platform that allows users and AI agents to run heavy applications, GPUs, and environments in browser tabs without installation or driver setup. It enables parallel execution of multiple apps with dedicated compute resources and orchestrates agent workloads through a chat interface.

1 investor

Prototyping.io uses artificial intelligence to convert computer-aided design files into finished mechanical components, with automated analysis and production processes designed to reduce cost and accelerate delivery.

1 investor

qomplement is an ERP platform designed for AI agents to operate enterprise supply chain, planning, and financial operations without manual human intervention. It integrates with existing systems and automates inventory management, demand planning, procurement, and order management across logistics and retail operations.

1 investor

RASPIRE provides AI-powered runtime protection for mobile applications that operates at the post-compile stage without requiring source code modifications. It serves mobile development teams at banks, fintechs, and other high-risk organizations seeking fast deployment of security protections.

1 investor

ReasonBlocks provides a runtime layer that optimizes AI agent performance by correcting reasoning processes and reducing token usage during execution, resulting in lower costs and improved reliability across repeated operations.

1 investor

Regbase provides regulatory monitoring and compliance tracking for lawyers, compliance officers, and business teams across employment law, AI governance, healthcare, privacy, government procurement, climate, private equity, and regulated industries.

1 investor