Cybersecurity Startups

Securly builds digital safety and security solutions for K-12 schools to protect students and support educators. The platform aims to create safe learning environments by addressing threats like violence, self-harm, bullying, and learning distractions.

4 investors

Sekoia offers a security operations center (SOC) platform that uses autonomous AI agents to detect, investigate, and respond to cyber threats, along with threat intelligence. It serves security teams and MSSPs (managed security service providers) in the cybersecurity market.

4 investors

Sensity AI develops deepfake detection technology that identifies synthetically generated or manipulated images, videos, and audio by using deep learning to detect pixel-level and acoustic artifacts left by generative AI. Its forensically robust analysis is aimed at states, organizations, businesses, individuals, and law enforcement handling cases of fraud, harassment, and abuse.

4 investors

Sentinel is a blockchain-based protocol and SDK for building decentralized VPNs, where node discovery, sessions, payments, and bandwidth run on-chain across a network of independent node operators. It provides a white-label stack for developers to launch branded dVPN applications and for operators to host nodes and earn bandwidth rewards.

4 investors

Sentra provides data governance and visibility solutions that help enterprises understand and control what data their AI systems can access and potentially expose.

4 investors

SEON provides a fraud prevention and AML decision-making platform that uses real-time first-party data signals and an AI rules engine to detect fraud and automate compliance across the customer journey. It serves businesses in fintech, payments, eCommerce, and iGaming.

4 investors

Sevco Security, now part of Arctic Wolf, provides an exposure management platform (branded Aurora) that discovers an organization's full attack surface, prioritizes vulnerabilities and misconfigurations by risk, and guides remediation. It offers vulnerability management and attack surface management for enterprise IT and security teams.

4 investors

ShardSecure provides agentless, file-level encryption and its patented Microshard technology to secure data across on-premises, cloud, and hybrid/multi-cloud environments for enterprises. Its platform defends against ransomware with self-healing data resilience and includes an MCP Secure Gateway that controls enterprise data retrieval for AI inference.

4 investors

SIGA provides operational technology (OT) cybersecurity solutions for oil and gas infrastructure, monitoring raw electrical signals from industrial control systems to detect cyberattacks and malicious manipulation of critical assets before processes are compromised. The platform offers multi-level visibility, real-time threat detection, and incident response support specifically designed for legacy systems used in refineries, pipelines, and upstream platforms.

4 investors

Sigma360 builds risk intelligence software that combines global data, entity resolution, and matching to deliver financial crime, credit risk, and decisioning solutions. It serves financial services, corporates, and professional services firms, supporting AML screening, monitoring, KYC, KYB, and CDD compliance.

4 investors

Simbian builds an AI-driven security operations (SecOps) platform that uses autonomous AI agents to investigate alerts, run threat hunts, conduct penetration tests, and manage network and firewall operations for enterprise and MSSP security teams. The platform is designed to defend against AI-powered cyberattacks while automating existing SOC workflows.

4 investors

Siren is a data search and intelligence platform that connects disparate data sources and enables advanced queries on billions of records for national security, law enforcement, and corporate fraud investigations. The platform serves government intelligence agencies, law enforcement, and enterprise security teams to perform real-time analysis of unstructured data including classified and open-source intelligence.

4 investors

Sitehop provides encryption technology designed for real-time data protection that prioritizes speed and quantum-readiness. The company serves organizations seeking to secure data-in-motion without compromising performance or future-proofing against quantum threats.

4 investors

SlashNext (now part of Varonis as "Varonis Interceptor") offers AI-native email security that detects phishing, business email compromise, and social engineering attacks across email and collaboration apps. It uses NLP and computer vision to analyze message intent and scan URLs and websites, serving enterprise security teams.

4 investors

Sonrai Security provides a cloud permissions management platform that enforces least privilege access across cloud identities and services. The solution is designed for security teams to reduce access risk while enabling seamless collaboration with DevOps and cloud operations teams.

4 investors

SpaceComputer is a distributed satellite network providing censorship-resistant computation and verifiable settlement across Earth and orbit, using satellite-hosted trusted execution environments (TEEs), confidential smart contracts, and quantum-hardened cryptography. It offers space-based confidential compute infrastructure with developer-friendly APIs for integrating security services into enterprise solutions.

4 investors

Spikerz provides social media security software for PR and communications teams, offering account takeover protection, AI comment moderation, permissions management, and impersonator takedown. It helps brands protect their social media accounts and manage reputation by detecting threats, moderating abusive comments, and controlling account access.

4 investors

SpinOne is an agentless, API-based SaaS data protection platform that secures data across Google Workspace, Microsoft 365, Slack, Salesforce, and Jira through unified backup, ransomware detection, posture management, and data loss prevention. It serves enterprise IT security and operations teams seeking to protect mission-critical SaaS applications while maintaining compliance with standards like HIPAA, GDPR, and SOC 2.

4 investors

The page presents itself as a set of LLM-oriented documentation reminders rather than a standard marketing site. It describes a platform (formerly known as Stack Auth) offering developer apps for connecting with users, including authentication, fraud protection, teams, RBAC, API keys, payments, emails, webhooks, and analytics, delivered via SDKs for JavaScript/TypeScript, Next.js, React, and TanStack Start.

4 investors

Station70 builds institutional-grade security products for enterprise asset protection, including private key backup and recovery (Bunker) and secrets management (Gatekeeper). The company serves enterprises that depend on critical assets like keys, identities, and access controls, using zero-knowledge cryptography and hardware security modules.

4 investors

Stoïk combines cyber insurance and security software to help companies manage and reduce their cyber risk exposure. The platform serves SMEs and mid-market enterprises through insurance brokers, offering both preventive security measures and comprehensive cyber liability coverage.

4 investors

StratusGrid provides cloud technology consulting and solutions, working with startups, small and medium businesses, and large enterprises. The company focuses on cloud infrastructure, DevOps, and technology product delivery.

4 investors

Stytch provides an identity and authentication platform for applications and AI agents, offering authentication, authorization, security, and fraud protection features. The platform serves enterprise customers and developers building multi-tenant applications.

4 investors

Superagent provides autonomous security research to identify, fix, and disclose software vulnerabilities in code and AI agents. The platform delivers patches as pull requests for software teams to review and deploy.

4 investors