Runtime Ventures

Runtime Ventures is a venture capital firm established in 2023 and located in Arlington, Virginia. It specializes in making investments at the pre-seed and seed stages, with a particular emphasis on the cybersecurity sector. The firm aims to support ambitious founders who are developing innovative solutions for secure enterprises, positioning itself as a unique player in the U.S. venture capital landscape.

Michael Sutton

General Partner and Co-Founder

David Endler

General Partner and Co-Founder

11 past transactions

SplxAI

Seed Round in 2025
SplxAI is a cybersecurity company specializing in automated security testing for AI chatbots, ensuring they remain safe from manipulation and data breaches. The platform continuously monitors and tests chatbots for vulnerabilities such as prompt injection, context leakage, social engineering, and other advanced threats. Key features include real-time detection and mitigation strategies, multimodal pentesting capabilities (covering text, audio, and video), and comprehensive reporting tools that provide actionable insights for improving security. SplxAI's solution integrates seamlessly with existing security frameworks and platforms, making it easy to deploy and manage. By providing robust protection against a wide range of threats, SplxAI helps enterprises safeguard their AI-driven applications, maintain data integrity, and ensure compliance with industry standards. The company is committed to innovation, continuously enhancing its product to address emerging threats in the rapidly evolving AI landscape. SplxAI is trusted by forward-thinking organizations looking to proactively secure their AI assets and protect sensitive information.

ThreatMate

Seed Round in 2025
ThreatMate is a cybersecurity company that focuses on providing a comprehensive platform designed specifically for mid-sized businesses. Founded by a team of experienced entrepreneurs and cybersecurity professionals, ThreatMate aims to protect these organizations from various cyber threats while helping them meet compliance requirements. The platform features inquisitive security capabilities that allow users to identify network vulnerabilities and provide actionable insights to security operations teams and management. By streamlining the cybersecurity process, ThreatMate enables clients to enhance their data protection and achieve a fully secured system, ultimately reducing sales cycles and safeguarding critical organizational information.

Prequel

Seed Round in 2024
Prequel collects worldwide failure knowledge that is typically buried in GitHub threads, Discord channels, and postmortems.

System Two Security

Venture Round in 2024
System Two Security is a provider of advanced security services aimed at reducing cyber attacks. The company offers a platform that integrates AI agents and assistants to support detection engineering teams in various tasks such as processing intelligence, creating new detections, and managing detection libraries. Its generative AI capabilities enable threat hunting and automated investigation, specifically designed for enterprise security operations centers and managed security service providers. By employing custom fine-tuned language agents, System Two Security effectively profiles, detects, and contains emerging threats, thereby enhancing the safety and security of its clients against cyber threats.

SplxAI

Pre Seed Round in 2024
SplxAI is a cybersecurity company specializing in automated security testing for AI chatbots, ensuring they remain safe from manipulation and data breaches. The platform continuously monitors and tests chatbots for vulnerabilities such as prompt injection, context leakage, social engineering, and other advanced threats. Key features include real-time detection and mitigation strategies, multimodal pentesting capabilities (covering text, audio, and video), and comprehensive reporting tools that provide actionable insights for improving security. SplxAI's solution integrates seamlessly with existing security frameworks and platforms, making it easy to deploy and manage. By providing robust protection against a wide range of threats, SplxAI helps enterprises safeguard their AI-driven applications, maintain data integrity, and ensure compliance with industry standards. The company is committed to innovation, continuously enhancing its product to address emerging threats in the rapidly evolving AI landscape. SplxAI is trusted by forward-thinking organizations looking to proactively secure their AI assets and protect sensitive information.

StepSecurity

Seed Round in 2024
StepSecurity offers a robust security platform tailored for GitHub Actions, aimed at enhancing the security of CI/CD pipelines. With a focus on safeguarding workflows, the platform enables users to set minimum token permissions and pin dependencies, thereby improving software supply chain security. It is utilized by over 3,000 open-source projects, including notable organizations such as the Cybersecurity and Infrastructure Security Agency, Google, and Microsoft. Additionally, StepSecurity's enterprise solutions are actively deployed in various sectors, including cryptocurrency, healthcare, and cybersecurity, reflecting its versatility and commitment to securing modern development practices.

Dodgeball

Seed Round in 2024
For Trust & Safety teams who don’t have the engineering resources to build the platform and processes that work for them, DodgeBall orchestrates both the technology and human elements of their end-to-end operations. With a no-code engine that puts control of fraud tool integrations and policy definition directly in the hands of your team, the Customer Data Platform offers a single pane of glass to investigate and manage visitor risk across the entire transaction journey.

Miggo Security

Seed Round in 2024
Miggo Security is the Application Detection and Response (ADR) platform with a mission to prevent application breaches.

Enveedo

Seed Round in 2023
Enveedo is a SaaS platform that helps to design, prioritize, and automate vital security activities.

Keep Aware

Seed Round in 2023
Keep Aware offers a human-centric browser security platform designed to protect against browser-based attacks and cyber threats. This innovative solution utilizes behavioral analytics to identify and block phishing attempts, data loss, and malicious downloads. By adapting to the unique behavior patterns of individual users and groups, Keep Aware's platform provides a proactive and flexible approach to security that evolves with emerging threats. The company serves a diverse range of clients, including law firms, government entities, and professional services, helping them implement security measures that integrate seamlessly into their daily operations. This focus on a safety-first strategy equips organizations to effectively counter threats such as credential phishing, email spoofing, social engineering, and malicious extensions.

Flow

Seed Round in 2019
We help neo-banks and other financial services to seamlessly integrate our money automation solutions, enabling their customers to magically gain back control of their money. By leveraging years of experience in building a successful product/app Flow Your Money, Flow is capable of transforming any product into a successful FinTech product. Whatever we invent in the finance space, we’ll always aim to offer delightful products that enable financial services companies to amaze their customers.
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