Cybersecurity Startups

Sesame IT develops Jizō AI, a network detection and response platform that uses behavioral analysis, MITRE ATT&CK correlation, and lateral-movement detection to identify known and unknown attacks across IT, OT, and Cloud environments. It provides SOC teams and compliance officers with unified threat detection, incident investigation, automated response playbooks, and threat intelligence.

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

Shiboleth automates compliance quality assurance workflows for financial services firms, offering tools to screen complaints, transcribe and summarize customer interactions, test transaction compliance with regulations like TILA and FCRA, and verify sanctions screening.

2 investors

Sia provides decentralized, open-source storage and data protection technologies for privacy-preserving applications. The company targets users and developers seeking secure, alternative storage solutions outside traditional centralized systems.

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

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

Signal provides AI-powered threat intelligence, monitoring the surface, deep, and dark web along with social media and forums to detect, analyze, and alert organizations to emerging security threats in real time. It serves corporate security and emergency management teams across sectors including financial services and healthcare.

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

Silverguard is a Brazilian anti-fraud platform that detects scammers and money-mule ("conta laranja") accounts across onboarding, transactions, and MED chargeback disputes via its Scam Checker risk-scoring product, and helps scam victims recover funds through its free SOS Golpe reporting channel and MED-as-a-Service tools. It serves financial institutions and consumers in Brazil, with a focus on protecting people over 60 from scams.

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

SilverSky provides cybersecurity advisory, managed security, and extended detection and response (XDR/MxDR) services for regulated and audit-driven organizations that cannot tolerate security failures. The company helps customers move from fragmented security activities to coordinated security execution through people, processes, and operational discipline.

2 investors

Simeio develops Identity and Access Management (IAM) solutions for securing organizational access and identity systems.

2 investors

Simudyne builds simulation and agent-based modeling software that combines AI and machine learning to help organizations test decisions and drive growth. The company serves global banks, regulators, and exchanges.

2 investors

Barracuda XDR is an extended detection and response platform for managed service providers, aggregating logs and data across environments into a centralized view and backed by a 24/7 global security operations center. It helps MSPs deliver cybersecurity monitoring, threat detection, and incident response to their customers and meet compliance requirements.

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

Skyhigh Security provides cloud and data security products, including its Security Service Edge (SSE) portfolio with SWG, CASB, ZTNA, DLP, and DSPM capabilities, for enterprises securing hybrid cloud and SaaS environments. Its offerings apply AI to data protection across web, cloud, and application access.

2 investors

Skypher automates security questionnaire completion for B2B SaaS companies. The platform helps sales and security teams handle compliance and vendor security assessments across any format.

2 investors

SlashID provides an identity security platform that detects, governs, and manages human, machine, and AI identities across hybrid and multi-cloud environments. The platform offers threat detection, posture management, and automated remediation to reduce breach risk and operational costs for security leaders.

2 investors

Slik Safe builds an end-to-end encrypted file storage and syncing app for macOS, iOS, and web that keeps users' personal and work files private across devices. Its encryption algorithm is made open and public, and it aims to unify search across multiple cloud storage accounts such as Drive, Dropbox, and Box.

2 investors

SmartExchange is a secure portal platform for private equity fund managers and investors that centralizes fund reporting, investor communication, and data management. It serves fund administrators and investors with features for fund accounting oversight, event management, document control, and portfolio tracking.

2 investors

Social Links provides open-source intelligence (OSINT) software that aggregates data from 500+ open sources including social media, messengers, blockchains, and the Dark Web to visualize and analyze it for investigations. Its platform, API integrations, and certification services serve law enforcement, government agencies, and commercial organizations for security and investigative work.

2 investors

Socly provides a compliance automation platform paired with expert human support to help cloud, SaaS, and startup teams prepare for and maintain audits across standards such as SOC 2, ISO 27001, GDPR, HIPAA, and ISO 42001. It automates evidence collection, continuous monitoring, and gap detection to keep organizations audit-ready year-round.

2 investors