Cybersecurity Startups

Seald provides an end-to-end encryption SDK for web and mobile applications, enabling developers to encrypt sensitive data client-to-client so that only authorized parties hold decryption keys. The toolkit addresses data access vulnerabilities and helps applications comply with regulations like HIPAA, GDPR, and CCPA.

2 investors

Secfix is a security compliance platform that helps companies achieve and maintain certifications such as ISO 27001, SOC 2, TISAX, GDPR, DORA, and NIS2 through automated checks, employee onboarding, vendor, risk, and policy management. It targets businesses in the European market seeking to automate regulatory and security compliance.

2 investors

SecuLetter is a content security company that protects against malware and threats hidden in files and documents, serving public sector, financial, and defense customers. The KOSDAQ-listed cybersecurity firm is expanding its content security category since its 2023 listing.

2 investors

SecureAuth provides a unified identity platform that handles authentication, authorization, and access enforcement for workforce, customer, partner, API, and AI agent use cases across the enterprise. The platform integrates adaptive MFA, passwordless authentication, behavioral AI, physical presence detection, and identity governance in a single system.

2 investors

Securiti provides data and AI governance solutions that enable organizations to safely manage and leverage data and artificial intelligence technologies.

2 investors

SecuritySnares develops ransomware detection and prevention technology that uses microsensor technology to block ransomware attacks at the encryption stage. The solution targets organizations seeking additional protection layers beyond traditional endpoint security.

2 investors

SELF provides decentralized identity infrastructure enabling users to store and manage their own credentials in a non-custodial wallet, eliminating the need for companies to maintain centralized identity databases. The platform offers passwordless authentication and privacy-preserving verification for KYC, AML, and age verification across industries.

2 investors

Semmle built a semantic code analysis engine that lets developers and security researchers write declarative queries to find vulnerabilities and code patterns across large codebases. The company, acquired by GitHub, serves security teams and open source communities, and operates lgtm.com.

2 investors

Sendio provides email security solutions designed to protect business communications, with focus on inbox security, operational efficiency, and business continuity for enterprise customers.

2 investors

SENSE provides a data-mining platform that makes data exploration and analysis accessible to non-technical users through desktop and mobile interfaces. The platform automatically combines, classifies, and prioritizes fragmented alerts and events, enabling teams to recognize patterns and take informed action.

2 investors

Sevii develops an autonomous identity security platform using agentic AI to detect and eliminate threats without human intervention. The company targets security teams and organizations seeking automated threat response capabilities.

2 investors

ShareID offers liveness detection and identity verification technology that confirms a user is a real, present person through photo or video face capture with challenge steps. It targets organizations needing to meet regulatory standards, aligned with eIDAS 2.0 assurance levels, and includes protection against injection, presentation attacks, silicone masks, and deepfakes.

2 investors

Sidero Labs builds the Talos Platform, including Talos Linux — a minimal, immutable Linux OS purpose-built to run Kubernetes with a managed API (no SSH or shell), atomic upgrades, and security defaults like mTLS, CIS guidelines, and FIPS 140-3 compliance. It targets teams operating Kubernetes fleets across distributed, mission-critical, and physically constrained environments.

2 investors

SIEMonster builds an infinitely scalable Security Information and Event Management (SIEM) platform for organizations managing cybersecurity threats and risks. The platform includes automated threat detection, investigation, and containment capabilities, with a white-label solution available for partners.

2 investors

Semtech provides IoT connectivity solutions including cellular modules, routers, and global connectivity services for LPWA, 4G LTE, and 5G deployments. The company serves customers across utilities, healthcare, industrial manufacturing, transport, logistics, and public safety sectors requiring secure wireless connectivity.

2 investors

Sigen AI develops a video integrity platform that turns live or recorded feeds into tamper-evident, cryptographically verifiable assets with object-level signing, role-based encryption, and real-time redaction. It serves defense, intelligence, public safety, and law enforcement operations, and also targets retail analytics, smart city, and AI-training use cases.

2 investors

Sigma360 provides a unified platform for anti-money laundering investigations and entity risk screening, aggregating over 100 billion data points from global sources across 260+ jurisdictions. The platform serves compliance teams at financial institutions, payment processors, and e-commerce companies with real-time alerts, AI-powered entity summaries, and audit-ready case tracking.

2 investors

Signicat operates a digital identity platform offering eIDs, onboarding, KYC/KYB, trust orchestration, authentication, and e-signatures for organizations across Europe. It runs a partner program that works with ISVs, identity and data providers, and ecosystem partners to deliver secure digital identity services.

2 investors

Silent Push operates a proprietary scanning and aggregation engine that logs changes across the entire IPv4 and IPv6 space, providing security teams with pre-evaluated first-party data and query functionality to track and monitor attacker infrastructure. The company serves organizations' threat intelligence operations, aiming to surface the majority of live attacker infrastructure that most security data misses.

2 investors

RSA provides an AI-powered unified identity platform for organizations to manage authentication, access control, identity governance, and lifecycle management. The platform helps secure remote and hybrid work environments while maintaining compliance and reducing cybersecurity risks.

2 investors

SilverSky provides managed security services, MxDR (managed detection and response), and cybersecurity consulting for regulated and audit-driven organizations, helping them operate security controls behind compliance frameworks such as HIPAA, PCI, CMMC, SOC 2, and ISO 27001. It serves industries including healthcare, financial services, retail, government, and education, working across existing tools and Microsoft environments.

2 investors

Simeio provides managed Identity and Access Management (IAM) services and consulting to help organizations secure and manage identities for employees, customers, and partners across digital transformation initiatives. The company protects over 160 million identities daily through IAM design, implementation, and managed services with a service-first approach.

2 investors

SixMap provides a cyber defense platform that discovers digital assets across IPv4 and IPv6 using its 6Gen computational mapping algorithm and continuously scans all ports on each host to identify exposures. It serves public sector organizations and private enterprises with attack surface intelligence for risk mitigation.

2 investors

Skybox Security was a network security policy management vendor whose products helped organizations secure and manage their networks. The company ceased operations on February 24, 2025; the domain now hosts a transition page from Tufin offering migration support to former Skybox customers.

2 investors