YC Security
92 Y Combinator companies tagged Security, most in W22 (10).
Companies per batch
Companies
92 of 92 companies
ConiferS26 · AILeast cost routing system to reduce 70%+ token spend
DecaworkS26 · AITraining company-specific models that approve AI actions.
NebuSecS26 · AIAutonomous AI defense system for cyber attack
TraceforceS26 · AICrowdStrike for AI Agents
TridentS26 · AIAutonomous offensive security agents. The best defense is offense
Verdict MachineS26 · AIAI cybersecurity for financial institutions' digital assets
TolmoX26 · AITolmo is the AI security platform that secures every layer of cloud…
LogosGuardF25 · AIThe sensitive data redaction layer for AI
Veria LabsF25 · AIContinuous AI pentesting that finds and fixes vulnerabilities
AlterS25 · AISecure access control and authorization platform for agent workflows
PangolinS25 · AIOpen networking and security for your workforce, AI agents, and infra
TwentyTwoS25 · AIAI infrastructure for biosecurity
Better AuthX25 · Developer toolsThe authentication framework for TypeScript
CotoolX25 · AIAI Agents for Security Operations Teams
GolfX25 · AIAgentic AI Security and Governance
TinfoilX25 · AIEncrypted AI with verifiable privacy
Gecko SecurityF24 · AIThe AI Security Engineer to Find and Fix Vulnerabilities
Clearly AIS24 · AIAutomate security and privacy reviews
winfuncS24 · AIai-native security engineering for mission critical codebases
ZeroPathS24 · AIAutomatically find and fix your software vulnerabilities
PaziW24 · AIPlatform where autonomous companies are built
PromptArmorW24 · AILLM Security and Compliance
RisottoW24 · AIRisotto auto-solves IT support requests using AI
SuperagentW24 · AISecurity for AI-native developers
TesseralW24 · InactiveThe open source platform for managing identity in business software
CorgeaS23 · AICorgea finds, and fixes insecure code and packages autonomously.
RimwardS23 · AISolar farm security software for existing cameras
XeolS23 · AcquiredClose your outdated dependency attack vector
BlyssW23 · InactiveEnd-to-end encrypted AI.
EdgeBitW23 · AcquiredAutofix your software dependencies
EscapeW23 · AIOffensive security for the teams that are 100x outnumbered
InfisicalW23 · Developer toolsUnified platform for secrets, certs, and privileged access management
AccessOwlS22 · Developer toolsManaging your Employees' Access to SaaS
OneleetS22 · AIYC's most popular security compliance platform (SOC 2, ISO 27001,…
Slauth.ioS22 · InactiveThe IAM Policy Copilot
WolfiaS22 · AIWe help security, legal and sales teams answer customer questions
AgencyW22 · AIAgency replaces traditional security and compliance headcount with AI.
Argument Computer CorporationW22 · OtherAccelerate verifiable computing
BunkyrW22 · Developer toolsZero-Knowledge security without seed phrases or backup codes
FirezoneW22 · Developer toolsEasiest way to set up Zero Trust Access for your team
JumpWireW22 · AcquiredDynamic access controls for all data and databases
OpteryW22 · OtherOpt out software that removes your private info from the internet
Palitronica IncW22 · OtherDetect cyber attacks on critical physical infrastructure
Prembly (formerly Identitypass)W22 · Developer toolsIdentity Verification API for Emerging Markets
Reality DefenderW22 · AIEnterprise Deepfake Detection
StracW22 · AIData Discovery, DLP, DSPM for SaaS, Cloud, Gen AI & Endpoints
CloudanixS21 · Developer toolsCloud and Container Security Platform
ContraForceS21 · AISecurity Delivery Platform to orchestrate AI agents for Service…
idemeumS21 · AIAI-powered Application Control
KeyriS21 · AcquiredSecure fraud prevention and authentication platform for developers
RootlyS21 · AIAI-native on-call and incident response carefully crafted to help…
Squire.aiS21 · InactiveNever code alone.
TelivyS21 · AcquiredAutomate your cyber security risk assessments
authzedW21 · AIAuthorization Infrastructure securing AI at OpenAI, Zoom, & more
CybleW21 · AICyble - World’s First Intelligence-Driven, AI-Native Security…
Feroot SecurityW21 · AIAI-powered Compliance Platform for PCI 4, CCPA, HIPAA, CIPA, 50+ laws
ObservaW21 · InactiveCatch accidental database exposures before the bad guys
SlashAuthW21 · InactiveThe solution for fine-grained access control in web3
Swif.aiS20 · AIManage every device. Govern every AI agent.
VectrixS20 · AcquiredScan your SaaS apps and instantly identify security issues
RiotW20 · OtherCybersecurity awareness for fast growing companies
Visual OneW20 · InactiveAI for security cameras
LunaSecS19 · InactiveAn Open Source dependency security tool that is smarter than the rest
DopplerW19 · Developer toolsSecure secrets. Prevent breaches. Keep teams moving.
Dyneti TechnologiesW19 · OtherReduce payment fraudFuzzbuzzW19 · AcquiredFuzzing as a Service
FederacyS18 · InactivePenetration testing and bug bounty platform.
Tall PoppyS18 · OtherProtecting your employees against online harassment
AnjunaW18 · OtherAnjuna enabled organizations to trust any infrastructure
EnvKeyW18 · InactiveEnd-to-end encrypted configuration and secrets management
QuantstampW18 · OtherSecurity auditing for Web3
SqreenW18 · AcquiredSqreen is the application security platform for the modern enterprise
VantaW18 · AIVanta—the proven leader in automated compliance helping startups…
TemplarbitS17 · AcquiredProtecting applications from malicious activity
UpfortS17 · AITurnkey security & hassle-free cyber insurance from leading insurers
Ambient.aiW17 · AIAI company transforming enterprise physical security to prevent…
ApozyW17 · OtherApozy makes every website safe to browse
AmberBox Gunshot DetectionW16 · OtherDetect Gunshots | Inform Law Enforcement | Empower First Responders
CastleW16 · Developer toolsBlock bots & bad behavior
Patchwork SecurityW16 · InactiveSecurity patch notifications for servers. Build it, deploy it, and…
AppcanaryS15 · AcquiredAppcanary tracks the dependencies you use in your apps and servers…
FinalW15 · AcquiredA credit card that drastically reduces payment fraud and gives…
Rescue ForensicsW15 · InactiveActionable human trafficking intelligence
SmyteW15 · AcquiredSmyte stops bad actors on social networks and marketplaces.
BannermanS14 · InactiveSecurity Guard Company Marketplace
Kuna SystemsW14 · AcquiredWe're making a smart, front door camera with intercom that lets you…
MeldiumW13 · AcquiredSimple password & identity management for teams. Acquired by LogMeIn…
MattermostS12 · Developer toolsSecure Collaboration for Technical Teams
AuthyW12 · AcquiredAuthy is a Two-Factor Authentication platform for developers
Documents.MeW12 · InactiveClient-side encryption for your devices and the cloud.
WireOverW12 · InactiveReally secure file sending for big files.
AeroFSS10 · AcquiredSecure Enterprise Collaboration.Not affiliated with Y Combinator. From YC's public directory. Logos via logo.dev; trademarks belong to their owners.