Y Combinator Spring 2026 (X26) Companies

9 Mothers builds counter-drone defense systems that enable rapid deployment of point defense at infantry-mobile scale. The company serves military operators and procurement teams with hardware engineered for cost-effective attrition warfare against modern threats like FPV drones.

5 investors

AbInitio uses AI models to predict molecular properties, optimize bioprocess conditions, and recommend cell line and media selections for biopharmaceutical development. The company serves pharma and biotech teams to accelerate the path from drug candidate to commercial manufacturing scale.

1 investor

Adialante develops mobile MRI imaging units that arrive at clinical practices for diagnostic scanning, eliminating the need for hospital-based imaging facilities. The company serves private practices and clinics seeking to offer diagnostic-grade MRI services without capital investment or facility construction.

1 investor

Advanced Metal Research manufactures robotic welding systems equipped with computer vision for real-time seam tracking and post-weld inspection, converting manual welding into an automated, learning-based manufacturing process.

2 investors

AgentPhone provides phone numbers for artificial intelligence agents, enabling them to communicate with people and businesses via voice calls and text messages.

3 investors

AICEpower builds autonomous subsea drones for monitoring and protecting critical infrastructure using swarm technology. The company serves defense and security sectors focused on underwater surveillance and protection applications.

1 investor

Akkari automates customer operations for B2B SaaS companies, capturing signals from conversations and emails to surface commitments, blockers, and next steps, then executing follow-ups and closing loops. The platform integrates with Slack, email, and code editors to prioritize work and draft responses with full account context.

2 investors

Alchemize provides automated customs brokerage services for importers, using AI to replace manual workflows in tariff research and documentation to reduce shipping delays and compliance costs.

1 investor

Allowance provides AI agents with controlled, limited spending power through temporary payment credentials rather than direct access to real credit cards. The company enables AI agents to complete transactions like travel bookings and purchases while giving users fine-grained control over merchant, spending limits, and transaction expiry.

1 investor

Amboras builds autonomous AI systems for modern e-commerce platforms. The company develops AI-powered infrastructure to optimize conversion and sales for online retailers.

1 investor

Andco provides AI-powered case management software for personal injury law firms, automating document retrieval, medical record collection, insurance claim processing, and demand letter preparation from intake through settlement. The platform serves plaintiff firms by reducing manual administrative work across the entire case lifecycle.

2 investors

Andustry sources industrial parts, machinery, and components for hardware OEMs and manufacturers, handling supplier qualification, procurement, and logistics across global networks. The company specializes in production equipment, machining services, robotics components, and raw materials, delivering verified quotes and managing the end-to-end commercial process.

1 investor

Anoria makes a wearable device designed to help users read and understand their emotions. The product targets individuals interested in emotional intelligence and personal emotional awareness.

1 investor

Apollo Atomics develops compact nuclear power systems designed for rapid deployment. The company builds power-dense reactors intended for commercial electricity generation.

7 investors

AquaShield provides non-invasive water leak detection sensors that install on existing building pipes to monitor flow patterns in real-time and identify leaks before they cause damage. The system targets real estate portfolio managers seeking to reduce water damage claims and downtime across multiple properties.

1 investor

Ara is an autonomous coding agent that monitors development work, plans subsequent steps, and executes coding tasks using its own resources and memory to assist software teams in collaborative development.

1 investor

Archer provides financial infrastructure for data marketplaces and AI labor platforms, enabling instant payments to global contributors using stablecoins and yield on idle balances. The platform serves data providers, AI labor networks, and reinforcement learning environments that supply training data to frontier AI labs.

1 investor

Arctic Health provides credentialing services that help healthcare providers get in-network faster by pairing operational expertise with technology. The company serves telehealth providers, clinics, group practices, RCM companies, and CVOs across the United States.

1 investor

Arden provides an end-to-end audit automation platform that collects evidence across systems and executes control tests for SOX compliance. The product targets internal audit teams at enterprises where security is critical.

2 investors

Ardent provides instant, production-grade database clones that load in seconds and scale efficiently, enabling AI agents and developers to test database code and solve data problems without risk to production. The platform is designed for data teams running AI workloads at scale.

2 investors

Arga Labs provides testing infrastructure for AI agents and applications that need to interact with multiple third-party services. The platform allows developers to run agent workflows and code changes in isolated, resettable sandbox environments with digital twins of external APIs, without modifying production data.

2 investors

Arlo Industries builds a sensor network that detects and tracks aerial threats including drones using passive, distributed technology rather than traditional radar, serving military and defense operators.

1 investor

Armature captures and analyzes user sessions with AI agents, showing what users ask, how agents respond, and identifying use cases and failures. The platform helps product teams understand agent behavior and fix issues through session replay and analysis.

1 investor

Arzana provides ERP and automation tools designed specifically for manufacturers and distributors to streamline administrative and office operations. The company serves American manufacturers with a forward-deployed model where engineers work onsite to customize solutions for their existing operations.

1 investor