Active YC companies

Largest active YC companies by team size

• .Wave(Winter 2025 · 2 people) — Continuous inference for streaming AI models
• /dev/fast(Winter 2026 · 4 people) — /dev/fast is the AI-native code forge
• &AI(Summer 2024 · 7 people) — Collaborative workspace for patent litigators
• 10 By 10(Summer 2017 · 5 people) — 10by10 is a unique marketplace in the recruiting agency industry for…
• 100x(Summer 2022 · 3 people) — Create, Share, and Monetize AI Agents
• 10x(Winter 2025 · 3 people) — AI Sales Teams for Dental Practices
• 10x Science(Winter 2026 · 5 people) — The AI-native platform for next-generation protein characterization.
• 1849 bio(Summer 2024 · 3 people) — Engineering microbes for miners to unlock billions in trapped metal
• 1910(Winter 2019 · 20 people) — Multimodal AI Platform for Modality Agnostic Drug Discovery™
• 1stCollab(Winter 2023 · 11 people) — Performance-Optimized Influencer Marketing at Scale
• 21st(Winter 2026 · 3 people) — UI building blocks for the agentic internet
• 222(Winter 2023 · 23 people) — the AI social facilitator for offline human to human interactions
• 42(Winter 2014) — Analytics stack for omnichannel retailers and brands
• 64x Bio(Summer 2018 · 25 people) — Enabling next generation medicines. A comprehensive platform and…
• 6thSense(Summer 2026 · 4 people) — Nervous System for Physical AI
• 7cups(Summer 2013 · 11 people) — 7 Cups is an emotional support service that matches up people that…
• 80,000 Hours(Summer 2015 · 13 people) — An online guide that tells talented graduates how to maximise the…
• 83 Sciences(Summer 2026 · 3 people) — AI-native materials discovery powered by unpublished experimental data
• 9 Mothers(Spring 2026 · 19 people) — Counter Drone Systems. $1.6m sales. We delivered for the DoW.
• 99minutos(Winter 2020 · 5000 people) — The fastest shipping for online shopping
• 9gag(Summer 2012 · 36 people) — Make the world happier.
• a0.dev(Winter 2025 · 3 people) — We make mobile apps using AI.
• A1Zap by A1Base(Winter 2025 · 2 people) — The social network layer for AI apps
• Abacum(Winter 2021 · 125 people) — The AI-native FP&A platform that helps Finance teams drive business…
• Abalone Bio(Winter 2020 · 14 people) — We create activating antibodies to treat diseases others can’t.
• Abatable(Summer 2021 · 35 people) — Carbon markets platform and solutions
• Abel Police(Summer 2024 · 5 people) — Automating police paperwork
• Abhi(Summer 2021 · 10 people) — Abhi is Pakistan's 1st financial wellness platform focusing on…
• AbInitio Bio(Spring 2026 · 2 people) — The Intelligence layer for Drug Manufacturing
• Abstra(Summer 2021 · 18 people) — Automate finance operations with Python and AI
• Absurd(Fall 2025 · 6 people) — The Creative OS for AI video
• Abundant(Fall 2024 · 7 people) — Agent simulation and RL for researchers
• Accend(Summer 2023 · 18 people) — AI agents for commercial underwriting at banks and fintechs
• AccessOwl(Summer 2022 · 15 people) — Managing your Employees' Access to SaaS
• AccioJob(Winter 2019 · 120 people) — Offline-first tech skilling and placement for India
• Accord(Winter 2020 · 20 people) — The Revenue Excellence Platform
• Acely(Winter 2018 · 30 people) — Every student's AI coach for college readiness
• ACLU(Winter 2017 · 501 people) — Defender of rights and liberties
• Acolite(Spring 2025 · 3 people) — AI Native Commercial Insurance Broker
• Acrely(Summer 2025 · 6 people) — Enterprise Voice Agents
• Actipulse Neuroscience(Winter 2022 · 38 people) — Bringing non-invasive brain stimulation from the hospital to the home
• Activeloop(Summer 2018 · 15 people) — Database for AI
• Activepieces(Summer 2022 · 10 people) — Open-source, AI-first and no-code business automation tool
• Acunote(Winter 2011)
• ACX(Summer 2024 · 4 people) — Next-generation biocides for sustainable agriculture at scale
• Ad Army(Summer 2022 · 5 people) — Generate, iterate, and ship AI ad creatives faster
• Adam(Winter 2025 · 4 people) — AI Powered CAD
• Adapted(Winter 2024 · 2 people) — AI physical therapy for athletes
• Adaptional(Summer 2025) — AI-powered insurance claims review
• Adaptyv(Summer 2021 · 25 people) — We're building fully automated labs for protein engineering
• Aden(Winter 2020 · 5 people) — Open source agent generation framework
• Adentris(Spring 2025 · 5 people) — Real-time AI Compliance & Revenue Integrity for Medical Providers
• Adialante(Spring 2026 · 4 people) — Cancer screening without barriers
• Adni(Summer 2021 · 5 people) — The career community for healthcare workers
• Adravision(Summer 2021 · 8 people) — Automation for dental clinics and insurance companies.
• Adri AI(Winter 2023 · 3 people) — Your AI Partner for SAP Development
• Advanced Metal Research(Spring 2026 · 3 people) — Machine intelligence for American Welding
• Advano(Summer 2017 · 25 people) — Advano is a battery technology company that improve the longevity of…
• Advantage Club(Summer 2021 · 220 people) — Global platform for employee engagement with rewards&flexible benefits
• Adventris Pharmaceuticals(Winter 2023 · 7 people) — Adventris makes cancer vaccines
• adyn(Summer 2020 · 7 people) — The first test designed to prevent birth control side effects
• Aecore(Summer 2017 · 6 people) — Vertically integrated commercial construction
• Aegis(Spring 2025 · 3 people) — AI Agents to win denied health insurance claims.
• Aella(Winter 2017 · 60 people) — Diversified credit infrastructure powering payments across Africa.
• Aemon(Winter 2026 · 3 people) — The Forward-Deployed AI Research Engineer
• Aerogen Systems(Summer 2026 · 4 people) — Modernizing Chip Manufacturing Infrastructure
• Aerones(Winter 2018 · 250 people) — Robotics for wind turbine maintenance.
• AesculaTech(Winter 2018 · 6 people) — Responsive materials, better lives.
• Aesthetic(Summer 2018 · 4 people) — Your AI-powered creative apprentice 🪄
• Affil.ai(Summer 2024 · 4 people) — AI Affiliate Network For Financial Companies
• Affinity(Summer 2023 · 2 people) — A compliance training platform built for regulated industries.
• Affogato AI(Summer 2021 · 15 people) — Affogato AI — Your Agent for instant TikToks, Reels, and ads.
• Afriex(Summer 2020 · 55 people) — Instant, low-fee remittances
• Aftercare(Winter 2024 · 3 people) — Conversational AI surveys with intelligent follow-up questions
• Afternoon.co(Fall 2024 · 4 people) — Bookkeeping, compliance and tax for founders
• AfterQuery(Winter 2025 · 30 people) — Applied research lab curating data solutions for foundation model…
• Agapé(Summer 2021 · 6 people) — Feel close, even when apart. One meaningful conversation at a time.
• Agave(Winter 2022 · 50 people) — AI Financial Operations for Construction
• Agency(Winter 2022 · 50 people) — Agency replaces traditional security and compliance headcount with AI.
• Agency Tool Company(Summer 2026 · 3 people) — Reliable infrastructure to build, deploy and manage real-world robots.
• AgendaPro(Winter 2021 · 50 people) — Shopify for Beauty and Wellness businesses in Latam
• Agent 37(Fall 2026) — Persistent sandboxes for agents like hermes, openclaw, claude code
• Agent Relay(Fall 2026 · 2 people) — The infrastructure to run coding agents for your team
• Agentcard(Summer 2026) — cards for AI agents
• AgentCollect(Summer 2023 · 42 people) — B2B debt collection powered by AI agents
• Agentic Fabriq(Winter 2026 · 2 people) — The control plane for AI agents.
• Agentic Labs(Winter 2024 · 2 people) — AI system design tools for dev teams
• Agentin AI(Winter 2025 · 2 people) — AI Agents that automate enterprise software processes
• AgentMail(Summer 2025 · 10 people) — Email Inboxes for AI Agents
• Agentnoon(Winter 2022 · 16 people) — Org design and workforce planning platform to drive org transformation
• AgentPhone(Spring 2026) — Phone Numbers for AI Agents
• Ageospatial(Fall 2026 · 1 people) — Physical intelligence for every decision with Geospatial AI.
• AgileMD(Summer 2011 · 19 people) — Predictive analytics and clinical pathways for hospitals
• Aglide(Summer 2023 · 6 people) — Connect every disconnected app to your SSO.
• Agnost AI(Summer 2026 · 2 people) — We find where AI agents fail, then train better models to run them.
• Ahazou(Summer 2021 · 27 people) — Podium for local businesses in Latam
• AI Insurance(Winter 2019 · 16 people) — AI Insurance is the platform that runs insurance companies
• AI Tech Packs(Summer 2021 · 2 people) — Build factory ready tech packs in minutes.
• AICE(Spring 2026 · 2 people) — Submarine drones for defense
• Aidy(Winter 2024 · 2 people) — Mobile app helping people better manage chronic health conditions

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