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YC Security Companies

131 Y Combinator security startups with verified founder contacts, batch info, and company data.

131

Companies

108

Active

Acquired

Public

YC Company Directory

50 companies

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Company	Batch	Description	Status	Location	Team	Founders	Reveal
Tolmo	X26	Tolmo is the AI security platform that secures every layer of cloud…	Active	San Francisco, CA, USA	12	Pierre Betouin, Vladimir de Turckheim, Jean-Baptiste Aviat	Reveal
Better Auth	X25	The authentication framework for TypeScript	Active	San Francisco, CA, USA	4	Bereket Engida	Reveal
BitPatrol	X25	AI-powered code security	Acquired	New York City, NY, USA	1	Christopher Lambert	Reveal
Casco	X25	Autonomous security testing for web apps, APIs, cloud, and AI systems	Active	—	10	Rene Brandel, Ian Saultz	Reveal
Cotool	X25	AI Agents for Security Operations Teams	Active	San Francisco, CA, USA	4	Logan Carmody, Eddie Conk, Max Pollard	Reveal
Golf	X25	Agentic AI Security and Governance	Active	San Francisco, CA, USA	1	Wojciech Błaszak, Antoni Gmitruk	Reveal
MindFort	X25	Autonomous Security Agents	Active	Los Angeles, CA, USA	5	Brandon Veiseh, Akul Gupta	Reveal
Probo	X25	We help you get compliant while you focus on your business.	Active	Paris, Île-de-France, France	6	Antoine Bouchardy, Bryan Frimin	Reveal
Tinfoil	X25	Encrypted AI with verifiable privacy	Active	San Francisco, CA, USA	5	Tanya Verma, Jules Drean, Sacha Servan-Schreiber	Reveal
Agentic Fabriq	W26	The control plane for AI agents.	Active	San Francisco, CA, USA	2	Paulina Xu, Matthew Xu	Reveal
BeeSafe AI	W26	Frontier AI Defenses for Social Engineering Attacks	Active	San Francisco, CA, USA	3	Daniel Spokoyny, Ariana Mirian, Nikolai Vogler	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
Crosslayer Labs	W26	Protect, monitor and defend your Internet presence	Active	San Francisco, CA, USA	3	Henry Birge-Lee, Grace Cimaszewski, Prateek Mittal	Reveal
Hex Security	W26	Agentic Offensive Security at Scale	Active	San Francisco, CA, USA	3	Huzaifa Ahmad, Ahmad Khan, Prama Yudhistira	Reveal
Lexius	W26	AI for Corporate Security Cameras	Active	San Francisco, CA, USA	3	David Elskamp, Liam Webster	Reveal
Protent	W26	Real time intelligence for law enforcement & security teams.	Active	San Francisco, CA, USA	2	Srihan Balaji, Abhisheik Sharma	Reveal
Candor	W25	Protect your data and stop insider risk	Active	San Francisco, CA, USA	3	Adarsh Ambati, Ansh Gupta, Aditya Iyengar	Reveal
Haleum	W25	Human Risk Intelligence for the AI-era	Active	San Francisco, CA, USA	3	Adarsh Ambati, Ansh Gupta, Aditya Iyengar	Reveal
SubImage	W25	The Open-Core Security Graph	Active	San Francisco, CA, USA	4	Alex Chantavy, Kunaal Sikka	Reveal
Aedilic	W24	Open-Source AI-generated image/deepfake detection	Active	San Francisco, CA, USA	2	Nicholas Waltz, Lukas Schneider	Reveal
Delve	W24	AI that makes compliance effortless	Active	San Francisco, CA, USA	33	Karun Kaushik, Selin Kocalar	Reveal
PromptArmor	W24	LLM Security and Compliance	Active	San Francisco, CA, USA	—	Shankar Krishnan, Vikram Jayanthi	Reveal
Shiboleth	W24	Shiboleth automates lending compliance for financial institutions…	Active	—	5	Esty Scheiner, Bivu Dhungana	Reveal
Shiboleth	W24	Shiboleth automates lending compliance for financial institutions…	Active	San Francisco, CA, USA	5	Esty Scheiner, Bivu Dhungana	Reveal
Superagent	W24	Security for AI-native developers	Active	San Francisco, CA, USA	2	Jordan Milkie, Alan Zabihi, Ismail Pelaseyed	Reveal
Tracecat	W24	The open source AI-native security automation platform	Active	New York City, NY, USA	—	Chris Lo, Daryl Lim	Reveal
Adri AI	W23	Vanta for AI	Active	San Francisco, CA, USA	2	Darshita Chaturvedi, Shyam Swaroop	Reveal
Blyss	W23	End-to-end encrypted AI.	Inactive	San Francisco, CA, USA; Remote	2	Samir Menon, Neil Movva	Reveal
compliant-llm	W23	Detect every data leak into third-party GenAI tools	Active	San Francisco, CA, USA	3	Neha Nupoor, Kaushik Srinivasan	Reveal
EdgeBit	W23	Autofix your software dependencies	Acquired	San Francisco, CA, USA	5	Rob Szumski, Eugene Yakubovich	Reveal
Escape	W23	Offensive security for the teams that are 100x outnumbered	Active	Paris, Île-de-France, France	29	Tristan Kalos, Antoine Carossio	Reveal
Infisical	W23	Unified platform for secrets, certs, and privileged access management	Active	San Francisco, CA, USA	50	Vlad Matsiiako, Tony Dang, Maidul Islam	Reveal
Matano	W23	Cloud Native SIEM (alternative to Splunk/Elastic)	Active	Seattle, WA, USA	2	Samrose Ahmed, Shaeq Ahmed	Reveal
Repacket	W23	Employee security done for you.	Active	Vancouver, BC, Canada	4	Noah Stanford, Michael Melone	Reveal
Variance	W23	AI Agents for Fraud Review and Investigations	Active	San Francisco, CA, USA	8	Karine Mellata, Michael Lin	Reveal
Nebula Security	S26	Autonomous AI defense system for cyber attack	Active	San Francisco, CA, USA; Remote	4	Eten Zou, Yuan Tan, Frank Wu, Xiaochuan Yu	Reveal
Traceforce	S26	Securing AI native apps directly on devices	Active	San Francisco, CA, USA	2	Xia Hua, Varun Wadhwa	Reveal
Trident	S26	Autonomous offensive security agents. The best defense is offense	Active	San Francisco, CA, USA	4	Junaid Mahmood, Dekai Li	Reveal
Verdict Machine	S26	AI cybersecurity for financial institutions' digital assets	Active	Tel Aviv-Yafo, Tel Aviv District, Israel	4	Dan Danay, Isaac Grossman, Liran Kogan	Reveal
Alter	S25	Secure access control and authorization platform for agent workflows	Active	New York, NY, USA	2	Srikar Dandamuraju, Kevan Dodhia	Reveal
ContextFort	S25	Visibility and Controls for Browser Agents	Active	San Francisco, CA, USA	2	Ashwin Ramachandran	Reveal
GhostEye	S25	Your always-on red team.	Active	New York City, NY, USA	6	Mohammad Eshan, Charles Antoine Malenfant	Reveal
Clearly AI	S24	Automate security and privacy reviews	Active	Seattle, WA, USA	17	Emily Choi-Greene, Joe Choi-Greene	Reveal
Unbound	S24	Use AI tools without fear of data leakage	Active	San Francisco, CA, USA	7	Rajaram Srinivasan, Vignesh Subbiah	Reveal
winfunc	S24	ai-native security engineering for mission critical codebases	Active	—	2	Mufeed VH, Vivek R	Reveal
ZeroPath	S24	Automatically find and fix your software vulnerabilities	Active	San Francisco, CA, USA	10	Dean Valentine, Nathan Hrncirik, Raphael Karger, Etienne Lunetta	Reveal
Kestrel AI	F25	AI-Native Cloud Incident Response Platform	Active	San Francisco, CA, USA	2	Raman Varma, Evan Chopra	Reveal
Multifactor	F25	Zero-trust authentication, authorization, and auditing for AI agents	Active	San Francisco, CA, USA	6	Vivek Nair, Colin Roberts	Reveal
Veria Labs	F25	Continuous AI pentesting that finds and fixes vulnerabilities	Active	San Francisco, CA, USA	3	Cayden Liao, Jayden Sarveshkumar, Stephen Xu	Reveal
Gecko Security	F24	The AI Security Engineer to Find and Fix Vulnerabilities	Active	London, England, United Kingdom	2	Jeevan Jutla, Artemiy Malyshau	Reveal

Batch Distribution

XX261 XX258 WW267 WW253 WW247 WW2310

Status Breakdown

Active108 Acquired19 Inactive4

Top Locations

San Francisco72 New York City12 New York6 Paris4 Seattle4 Tel Aviv-Yafo3

About YC Security Companies

Y Combinator has funded 131 security 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 security innovation globally.

108 of these companies are currently active. 19 have been acquired. VCBacked tracks verified founder contact information, team sizes, and company status for every YC security startup.

Related Industries

B2B3278 Healthcare805 Fintech709 Consumer654 Engineering, Product and Design610 Industrials489 Infrastructure303 Productivity208

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