Industry

YC B2B Companies

3,278 Y Combinator b2b startups with verified founder contacts, batch info, and company data.

3,278

Companies

964

Active

Acquired

Public

YC Company Directory

50 companies

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Company	Batch	Description	Status	Location	Team	Founders	Reveal
10x Science	W26	The AI-native platform for next-generation protein characterization.	Active	San Francisco, CA, USA	5	David Roberts, Andrew Reiter, Vishnu Tejus	Reveal
1code (21st.dev)	W26	Orchestration layer for coding agents	Active	San Francisco, CA, USA	3	Serafim Korablev, Sergey Bunas	Reveal
21st	W26	UI building blocks for the agentic internet	Active	San Francisco, CA, USA	3	Serafim Korablev, Sergey Bunas	Reveal
Aemon	W26	The Forward-Deployed AI Research Engineer	Active	San Francisco, CA, USA	3	Richard Zhou, Ray Xu	Reveal
Agentic Fabriq	W26	The control plane for AI agents.	Active	San Francisco, CA, USA	2	Paulina Xu, Matthew Xu	Reveal
Approxima	W26	Your software should build itself.	Active	Toronto, ON, Canada	2	Ethan Pronev, Ashish Selvaraj	Reveal
Arcline	W26	Startup legal work handled by elite lawyers & same-day turnaround	Active	—	5	Pamir Ehsas, Stefan Mandaric	Reveal
Arzule	W26	AI for B2B Partnerships	Active	San Francisco, CA, USA	2	Jeffrey Lin, Nikhil Reddy	Reveal
Ashr	W26	Automated Multi-Modal Testing for Agents	Active	San Francisco, CA, USA	2	Shreyas Kaps, Rohan Kulkarni	Reveal
Aurorin CAD	W26	Claude code for Mechanical Engineers	Active	San Francisco, CA, USA	1	Michael Baron	Reveal
AutoSitu	W26	The AI operating system for the built world	Active	—	2	George Zhai, Xuanshu (Asher) Lin, Asher Lin	Reveal
Autumn AI	W26	Stalk your prospects at scale.	Active	San Francisco, CA, USA	2	Shiv Kampani, Vishnu Sampathkumar	Reveal
Avoice	W26	Harvey for Architecture	Active	—	4	Chawin Asavasaetakul, Chawit Asavasaetakul, Chawin Asavasaetaku	Reveal
Balance	W26	Full-Stack AI Accounting	Active	London, England, United Kingdom	4	Mathias Løvring, Gus Levinson, Emil Munk	Reveal
BeeSafe AI	W26	Frontier AI Defenses for Social Engineering Attacks	Active	San Francisco, CA, USA	3	Daniel Spokoyny, Ariana Mirian, Nikolai Vogler	Reveal
Booko	W26	Dynamically pricing the whole economy.	Active	San Francisco, CA, USA	2	Will Hall, Arjun Saluja	Reveal
Bubble Lab	W26	Operating system for premium professional communities	Active	San Francisco, CA, USA	2	Selina Li, Zach Zhong	Reveal
Burt	W26	Easily fine tune and deploy specialized models	Active	San Francisco, CA, USA	2	Kurt Sharma, Bobby Zhong	Reveal
Button Computer	W26	The tiny computer built for voice AI.	Active	San Francisco, CA, USA	1	Chris Nolet	Reveal
Byteport	W26	Global upload acceleration for 1GB-100TB files.	Active	San Francisco, CA, USA	4	Jayram Palamadai	Reveal
Byteport	W26	Global upload acceleration for 1GB-100TB files.	Active	San Francisco, CA, USA	1	Jayram Palamadai	Reveal
Cajal	W26	Scaling formal verification to accelerate scientific discovery	Active	San Francisco, CA, USA	2	Pedro Nobre, Luke Johnston	Reveal
Canary	W26	The first AI QA engineer that understands your code	Active	San Francisco, CA, USA	2	Aakash Mahalingam, Viswesh N G	Reveal
Canary	W26	The first AI QA engineer that understands your codebase	Active	San Francisco, CA, USA	4	Viswesh N G	Reveal
Captain	W26	Self-tuning file search for AI agents	Active	San Francisco, CA, USA	2	Lewis Polansky, Edgar Babajanyan	Reveal
Cardboard	W26	Agentic video editor	Active	San Francisco, CA, USA	5	Saksham Aggarwal, Ishan Sharma	Reveal
Caretta	W26	Realtime AI for Sales Calls	Active	San Francisco, CA, USA	4	Kayra Bahadir, Omar Elamin, Pavlos Markesinis, Kayra Bahadır	Reveal
Caretta	W26	Realtime AI for Sales Calls	Active	San Francisco, CA, USA	4	Kayra Bahadir, Omar Elamin, Pavlos Markesinis	Reveal
Cascade	W26	Distilling Proprietary Intelligence	Active	San Francisco, CA, USA	2	Adam AlSayyad, Haluk Cem Demirhan	Reveal
Chamber	W26	The AIOps Agent for ML Teams	Active	Seattle, WA, USA	4	Charles Ding, Andreas Bloomquist, Jason Ong, Shaocheng Wang	Reveal
Chamber	W26	Autopiloting your AI infrastructure	Active	San Francisco, CA, USA	4	Charles Ding, Andreas Bloomquist, Jason Ong, Shaocheng Wang	Reveal
Chasi	W26	AI Revenue Engine for the Equipment Industry	Active	New York, NY, USA	2	Akash Pavan, Sarman Aulakh	Reveal
Coevolved	W26	Agents for Mortgage Origination	Active	—	2	Alex Li, Athan Zhang	Reveal
Cofia	W26	AI automations that implement themselves	Active	New York City, NY, USA	3	Moses Wayne, Paola Martinez	Reveal
Compresr	W26	LLM context compression for better accuracy	Active	San Francisco, CA, USA	4	Ivan Zakazov, Berke Argin, Kamel Charaf, Oussama Gabouj	Reveal
Confluence Labs	W26	AI models that learn from experience	Active	San Francisco, CA, USA	2	Brent Burdick, Niranjan Baskaran	Reveal
Constellation Space	W26	AI operating system for mega-scale satellite networks.	Active	Seattle, WA, USA	4	Kamran Majid, Laith Altarabishi, Raaid Kabir, Omeed Tehrani	Reveal
Constellation Space	W26	AI for space mission assurance.	Active	Seattle, WA, USA	4	Laith Altarabishi, Raaid Kabir, Kamran Majid, Omeed Tehrani	Reveal
Corelayer	W26	AI on-call engineer that debugs using data	Active	San Francisco, CA, USA	2	Shipra Jha, Mitch Radhuber	Reveal
Corelayer	W26	AI production engineer for regulated industries	Active	San Francisco, CA, USA	3	Mitch Radhuber, Shipra Jha	Reveal
Corvera	W26	The context layer for AI-native CPG brands	Active	San Francisco, CA, USA	4	Christopher Kong, Dirk Breeuwer, Matthew Collins	Reveal
Corvera	W26	Fully autonomous operations for CPG brands	Active	San Francisco, CA, USA	4	Dirk Breeuwer, Matthew Collins, Christopher Kong	Reveal
Crosslayer Labs	W26	Protect, monitor and defend your Internet presence	Active	San Francisco, CA, USA	3	Henry Birge-Lee, Grace Cimaszewski, Prateek Mittal	Reveal
Crosslayer Labs	W26	Protect, monitor and defend your Internet presence	Active	New York City, NY, USA	3	Henry Birge-Lee, Grace Cimaszewski, Prateek Mittal	Reveal
Crow	W26	Let users control your app through chat	Active	San Francisco, CA, USA	2	Jai Bhatia, Aryan Vij	Reveal
Cumulus Labs	W26	The Fastest Multimodal Inference OS	Active	San Francisco, CA, USA	2	Veer Shah, Suryaa Rajinikanth	Reveal
/dev/fast	W26	/dev/fast is the AI-native code forge	Active	San Francisco, CA, USA	4	Sid Menon, Ketan Agrawal, Milan Bhandari, Alex Iansiti	Reveal
Didit	W26	Infrastructure for identity and fraud.	Active	San Francisco, CA, USA	16	Alberto Rosas, Alejandro Rosas, Alberto Rosás García	Reveal
EigenPal	W26	AI Document Workflows for Enterprises	Active	San Francisco, CA, USA	—	Jedrzej Blaszyk, Matej Novak	Reveal
EigenPal	W26	AI Document Workflows for Enterprises	Active	San Francisco, CA, USA	—	Matej Novak, Jedrzej Blaszyk	Reveal

Batch Distribution

XX2693 XX2574 WW26160 WW25132 WW24220 SS2637

Status Breakdown

Active964 Inactive26 Acquired10

Top Locations

San Francisco661 New York City71 London31 New York17 Paris13 Stockholm12

About YC B2B Companies

Y Combinator has funded 3,278 b2b companies since its founding in 2005. These startups span from early-stage pre-launch to publicly traded companies, making YC one of the most prolific backers of b2b innovation globally.

964 of these companies are currently active. 10 have been acquired. VCBacked tracks verified founder contact information, team sizes, and company status for every YC b2b startup.

Related Industries

Healthcare805 Fintech709 Consumer654 Engineering, Product and Design610 Industrials489 Infrastructure303 Productivity208 Real Estate and Construction184

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