Y Combinator Summer 2026 (S26) Companies

Lumeria makes the Lumoscope, a multi-spectrum skin imaging scanner that clips onto a phone and uses RGB, UV, and polarized light to track skin conditions such as fine lines, tone, texture, pigment, and vascularity. Paired with an AI assistant called Lumi, it offers consumers personalized skincare routines, ingredient analysis, and progress tracking for at-home skin monitoring (not medical diagnosis).

1 investor

Machine0 provides on-demand persistent virtual machines with NixOS or Ubuntu, pre-installed development tools, and per-minute billing for developers and AI agents needing isolated compute resources. The service offers dedicated CPU/RAM, static IPs, and optional GPUs across multiple geographic regions.

2 investors

Magma helps companies that build AI agents package and license their agents' interaction data — traces, corrections, and completed workflows — to AI labs, paying those companies a revenue share. It handles onboarding, data mapping, and packaging so agent logs that would otherwise be discarded can be monetized.

2 investors

Maingen builds datasets and benchmarks from enterprise data to improve frontier AI models on industrial tasks, such as running industrial operations. Its SolarBench project measures whether models can operate an industrial operations desk.

2 investors

Manifold builds autonomous warehouse robots that perform case picking, palletizing, and trailer loading/unloading, combined with orchestration software that connects to existing ERP, WMS, and WES systems. It offers robotic labor to warehouse operators on a per-pick pricing model without upfront costs or major infrastructure retrofits.

1 investor

Truffle provides a unified operating system for restaurant back-of-house operations, using computer vision, voice AI, and machine learning to automate inventory tracking, demand forecasting, and workflows like procurement, scheduling, and food preparation.

3 investors

Marengo uses AI to automate engineering design for data centers, aiming to speed up and reduce the cost of the design process. It works with large-scale data center builders.

3 investors

Marker embeds with client companies to build custom AI agents on its Marker Command Center platform, aiming to move organizations toward AI-native operations. It targets enterprises pursuing AI transformation, designing agents that fit into the spreadsheets, reports, and workflows teams already use.

3 investors

Markov Studios captures screen recordings and interaction data from real computer use to create datasets that machine learning models can learn from. The company produces labeled data from real workflows in productivity software and video games.

2 investors

Mass Magnetics manufactures high-performance neodymium-iron-boron rare-earth magnets in the United States from recycled and domestic feedstocks, using a rapid sintering process and machine learning to sort scrap by grade and chemistry. It targets defense and industrial buyers needing DFARS-compliant domestic magnets and also sells DFARS-compliant rare-earth alloys to domestic metallurgists.

2 investors

Mentlio is an applied research lab that helps enterprise engineering teams measure AI tool spend against delivery on a per-engineer basis and reduce that spend using machine learning-based request routing, context optimization, and prompt compression. It serves companies adopting AI coding tools.

3 investors

Meteoric uses drones to fly into low- and mid-altitude clouds above solar plants and alter cloud droplets to reduce cloud reflectivity, letting more sunlight reach the panels. The company targets solar power operators, offering site-specific estimates of energy uplift across U.S. grid regions.

1 investor

Mireye provides an API that converts geographic coordinates into structured, sourced data about physical terrain, buildings, infrastructure, and environmental risk for AI agents. The platform aggregates U.S. federal datasets (USGS, NOAA, FEMA, and others) and returns data with full provenance and confidence ratings.

2 investors

Mochi is a streaming platform offering short-form episodic video series across genres such as romance, action, comedy, sci-fi, and revenge dramas. Its catalog features serialized titles with short episode counts aimed at mobile entertainment viewers.

1 investor

Molagri develops biopesticides that target harmful insects through specific molecular mechanisms while protecting beneficial insects and the environment, and incorporates resistance modeling to maintain product efficacy over time.

1 investor

OpenTrade makes stock market games that use real companies and market stories, allowing players to make investment calls and compare results with friends. The platform is designed for everyday investors who want to learn about market mechanics through gameplay.

1 investor

Mosaic offers a tool that aggregates and centralizes AI coding sessions in one place, distributed via a Homebrew package for developers and AI agents.

2 investors

Moving Atoms develops robotics AI, including a world model called Atom 1 that predicts future states from a robot's visual input and control signals to learn and execute motion. It uses agents and a frontier LLM to grade robot rollouts step by step, surfacing failure modes with footage.

1 investor

Nebula Security uses AI-driven security pipelines to accelerate vulnerability research in widely used software such as operating systems, browsers, and applications. The company identifies security bugs and vulnerabilities significantly faster than traditional manual research methods.

4 investors

Neuromorphic develops hardware-agnostic control software for robots, letting operators deploy and manage them through everyday interfaces such as Slack, email, and phone. It targets wet labs and other physical industries that want to add robots with minimal setup.

1 investor

Neuron Industries builds Cortex, an AI-native industrial controller that replaces the traditional PLC, HMI, historian, and vendor IDE in a single device, letting controls engineers describe machine behavior in plain English and generate auditable real-time Python code. The platform serves industrial automation and controls-engineering teams working on machines, skids, retrofits, and production lines, with a built-in browser IDE, wiring discovery, robot control, on-device historian, and simulation-based testing.

2 investors

Nex builds AI agents that connect to 1000+ integrations to automate manual workflows across business tools like HubSpot, Gmail, and Slack. The platform detects team patterns and deploys autonomous agents that improve over time, unifying fragmented software stacks into a shared knowledge graph for enterprise teams.

4 investors

Nori Robotics manufactures household robots that autonomously handle domestic tasks like cleaning, organizing, and food preparation. The robots can learn and share skills via a marketplace, and support remote operation for household assistance.

1 investor

Olam Labs builds multiplayer game environments — such as no-limit Texas hold'em, Risk-style conquest, Codenames-style word deduction, and market simulations — to study how AI agents negotiate, socialize, and compete alongside humans. It also runs large-scale internal simulations with hundreds of concurrent agents and publishes notable research runs.

4 investors