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YC Security Companies

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

Companies

Active

Acquired

Public

YC Company Directory

50 companies

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Company	Batch	Description	Status	Location	Team	Founders	Reveal
BeeSafe AI	W26	Stopping Scams Before They Reach Your Customers	Active	San Francisco, CA, USA	3	Ariana Mirian, Daniel Spokoyny, Nikolai Vogler	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
Protent	W26	Protent turns passive surveillance into proactive intelligence.	Active	San Francisco, CA, USA	2	Srihan Balaji, Abhisheik Sharma	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	Software that maps your infrastructure. Open core alternative to Wiz	Active	—	5	Gustaf Alstromer, 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	—	—	Shankar Krishnan, Vikram Jayanthi	Reveal
Shiboleth	W24	Shiboleth automates lending compliance for financial institutions…	Active	—	5	Esty Scheiner, Bivu Dhungana	Reveal
Superagent	W24	Red teaming for AI agents	Active	800 Indiana St, San Francisco, CA 94107, USA	2	Alan Zabihi, Ismail Pelaseyed	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	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	The only DAST that works with modern stack and tests business logic	Active	New York, NY, USA	29	Tristan Kalos, Antoine Carossio	Reveal
Infisical	W23	Unified platform for secrets, certs, and privileged access management	Active	San Francisco, CA, USA	40	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	Reveal
Variance	W23	AI Agents for Fraud Review and Investigations	Active	San Francisco, CA, USA	8	Karine Mellata, Michael Lin	Reveal
Variance	W23	AI Agents for Fraud Review and Investigations	Active	San Francisco, CA, USA	8	Karine Mellata, Michael Lin	Reveal
Agency	W22	Solving Complex Security and Compliance	Active	New York, NY, USA	—	Amir Tarighat, Tyler Carbone	Reveal
Firezone	W22	Easiest, most secure way to set up Zero Trust Access for your team	Active	Mountain View, CA, USA	3	Jamil Bou Kheir	Reveal
JumpWire	W22	Dynamic access controls for all data and databases	Acquired	New York, NY, USA	2	Ryan Cooke	Reveal
Munily	W22	Access control management app for Latam´s gated communities	Active	Panama City, Panama	30	Marwa Hage, Khaled Alhaj, Mitchell Contreras, carlos de la guardia	Reveal
Optery	W22	Opt out software that removes your private info from the internet	Active	San Francisco, CA, USA	55	Lawrence Gentilello, Chen Atlas	Reveal
Palitronica Inc	W22	Detect cyber attacks on critical physical infrastructure	Active	Kitchener, ON, Canada	6	Sebastian Fischmeister, Carlos Moreno	Reveal
Reality Defender	W22	Enterprise Deepfake Detection	Active	New York, NY, USA	54	Ben Colman	Reveal
Strac	W22	Data Discovery, DLP, DSPM for SaaS, Cloud, Gen AI & Endpoints	Active	Bellevue, WA, USA	8	Aatish Mandelecha	Reveal
Cyble	W21	Cyble - World’s First Intelligence-Driven, AI-Native Security…	Active	Atlanta, GA, USA	260	Beenu Arora, Manish Chachada	Reveal
Feroot Security	W21	AI-powered Compliance Platform for PCI 4, CCPA, HIPAA, CIPA, 50+ laws	Active	Toronto, ON, Canada	24	Ivan Tsarynny, Vitaliy Lim	Reveal
Observa	W21	Catch accidental database exposures before the bad guys	Inactive	—	1	Rob Picard	Reveal
Stacksi	W21	Automated Answers to Security Questionnaires	Acquired	Los Angeles, CA, USA	4	Emre Murray Mangir, Joseph Metzinger	Reveal
Riot	W20	Cybersecurity awareness for fast growing companies	Active	Paris, France	150	Benjamin Netter	Reveal
Skypher	W20	AI agent for Compliance Questionnaires Automation	Active	New York, NY, USA	12	Louis Mutricy, Gaspard de Lacroix	Reveal
Dyneti Technologies	W19	Reduce payment fraud	Active	San Francisco, CA, USA	3	Julia Zheng	Reveal
Termius	W19	Termius is an SSH client with team collaboration features	Active	—	35	Roman Kudiyarov, Dmitry Lyfar	Reveal
Anjuna	W18	Anjuna enabled organizations to trust any infrastructure	Active	Palo Alto, CA, USA	55	Ayal Yogev	Reveal
Hunter2	W18	Hunter2 trains engineering teams in application security through…	Acquired	Boston, MA, USA	0	Fletcher Heisler	Reveal
Quantstamp	W18	Security auditing for Web3	Active	Toronto, ON, Canada	80	Richard Ma	Reveal
Sqreen	W18	Sqreen is the application security platform for the modern enterprise	Acquired	San Francisco, CA, USA	120	Pierre Betouin, Jean-Baptiste Aviat	Reveal
Vanta	W18	Vanta—the proven leader in automated compliance helping startups…	Active	San Francisco, CA, USA	700	Christina Cacioppo	Reveal
Ambient.ai	W17	AI company transforming enterprise physical security to prevent…	Active	San Jose, CA, USA	95	Shikhar Shrestha, Vikesh Khanna	Reveal
Smyte	W15	Smyte stops bad actors on social networks and marketplaces.	Acquired	San Francisco, CA, USA	11	Pete Hunt, Julian Tempelsman, Josh Yudaken	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	Vulnerability Management for Human Risk	Active	New York, NY, USA	3	Mohammad Eshan, Charles Antoine Malenfant	Reveal
Clearly AI	S24	Automate security and privacy reviews	Active	Seattle, WA, USA	12	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

Batch Distribution

WW264 WW252 WW245 WW2310 WW228 WW214

Status Breakdown

Active66 Acquired13 Inactive2

Top Locations

San Francisco39 New York11 Toronto3 Seattle2 Mountain View2 Palo Alto2

About YC Security Companies

Y Combinator has funded 81 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.

66 of these companies are currently active. 13 have been acquired. VCBacked tracks verified founder contact information, team sizes, and company status for every YC security startup.

Related Industries

B2B641 Engineering, Product and Design139 Industrials89 Consumer80 Healthcare78 Fintech65 Infrastructure64 Productivity38

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