Cybersecurity Startups

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

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.

2 investors

Sliderule is a no-code platform that allows non-technical users to build decision logic workflows using drag-and-drop rules, data connectors, and analytics. It enables businesses to automate customer service tasks and integrate workflows via a single API.

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

Snappt offers an AI-powered verification platform for property managers that detects document fraud, verifies income through payroll and banking data, checks rental payment history, and confirms applicant identity across the leasing process. It serves the multifamily/residential property management industry to reduce fraudulent rental applications.

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

Sodot provides self-hosted key management infrastructure based on MPC (multi-party computation) and TEE (trusted execution environment) for securing crypto assets and transactions. It offers B2B self-custodial wallets and key management for banks, trading operations, and stablecoin/payment providers, with security audits and enterprise policy controls.

2 investors

Solvo provides a cloud security posture management (CSPM) platform with automated remediation to help security and engineering teams identify and address threats, vulnerabilities, and compliance issues across multi-cloud environments. It integrates with existing security and CI/CD tooling; the company was acquired by CYE.

2 investors

Sonoma provides a governance platform for enterprise deployments of AI agents built on the Model Context Protocol (MCP), offering a self-service MCP catalog, workflow builder, entitlement policies, audit logging, and security controls such as supply chain scanning and prompt injection protection. It targets enterprise security and IT teams in industries including finance, healthcare, retail, and manufacturing.

2 investors

Source Defense provides a client-side security platform that detects and prevents digital skimming, Magecart attacks, and threats from third-party JavaScript on websites and payment pages. It serves enterprises and Fortune 500 companies in highly regulated, transaction-heavy industries, helping them protect customer data and meet PCI DSS compliance requirements.

2 investors

Sourcery provides automated code review and security scanning tools that integrate with developer workflows to catch vulnerabilities, logic errors, and security gaps in code from initial writing through merge. The platform is designed for teams working with AI-generated code and operates across GitHub, GitLab, and IDEs.

2 investors

Soveren provides data discovery, monitoring, and intelligence tools that help companies manage sensitive data in compliance with regulations and business rules. It serves enterprises seeking to avoid building and maintaining in-house data governance platforms.

2 investors

Soyio is a platform for managing companies' relationships with their users' personal data in a traceable, secure, and regulation-compliant way, generating auditable evidence for each consent, update, or request. It offers modular tools covering the data lifecycle, including consent management and identity verification via document validation, biometrics, and authentication.

2 investors

Spectrum Labs provides content moderation and abuse intelligence for online communication platforms and AI systems, protecting users from safety threats across social media, messaging, and generative AI applications.

2 investors

Spektion is a vulnerability management platform that analyzes software in an organization's environment to determine what is actually exploitable, factoring in whether software is running, its privileges, network exposure, and blast radius. It helps security teams prioritize findings and reduce risk beyond scanner-only, CVE-based approaches, including coverage of zero-days, custom applications, and internal tools.

2 investors

Sphinx builds AI agents that help banks and fintech companies detect fraud and verify identities during customer onboarding, replacing manual compliance processes and catching synthetic identities and deepfakes. The platform assists financial institutions in compliance and know-your-customer (KYC) operations.

2 investors

Sprinto is a compliance and governance, risk, and compliance (GRC) platform that automates security compliance across 200+ frameworks such as SOC 2, ISO 27001, HIPAA, GDPR, and PCI DSS. It serves companies from Series A to enterprise, covering compliance, vendor risk, AI governance, and audit preparation through integrations with cloud, identity, HR, and SaaS systems.

2 investors

SpyHackerz is a Turkish-language online forum focused on hacking, cracking, and cybersecurity discussions. It hosts categories for hacking tools, cracking configurations and leaks, warez and nulled scripts, and beginner tutorials in ethical hacking.

2 investors

Stamus Networks develops Clear NDR, a network detection and response system built on the Suricata open-source engine that converts network traffic into security insights for security operations teams. It serves financial institutions and government agencies, and runs a podcast called Blue Team Diaries featuring conversations with security defenders.

2 investors

Sternum provides an embedded security and observability platform for IoT and connected device manufacturers, using patented runtime integrity verification (EIV) to prevent memory and command injection attacks, monitor device fleets, and detect threats with AI. Its agentless on-device solution serves manufacturers across sectors such as medical devices, supporting over 50 platforms with low performance overhead.

2 investors

imper.ai detects and prevents impersonation and social engineering attacks across communication channels by analyzing network, device, and behavioral telemetry signals rather than documents or biometrics. Its impersonation detection engine assigns real-time risk scores and enables enterprise teams to allow, restrict, or block sessions at the point of contact.

2 investors

STORES 株式会社 provides tools for small and mid-sized retailers to digitize their operations, including online store creation, POS registers, cashless payments, online booking systems, and app building. The company serves Japanese shop operators, offering combinable services to run and grow their businesses more efficiently.

2 investors