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.

David Endler

General Partner and Co-Founder

11 past transactions

SplxAI

Seed Round in 2025
SplxAI is a cybersecurity company that specializes in automated security testing for AI chatbots. Its platform continuously monitors and tests chatbots for vulnerabilities, such as prompt injection and context leakage, and provides real-time detection and mitigation strategies. The platform offers multimodal pentesting capabilities, covering text, audio, and video, and generates comprehensive reports with actionable insights. SplxAI's solution integrates seamlessly with existing security frameworks and is trusted by enterprises seeking to proactively secure their AI assets and maintain data integrity.

ThreatMate

Seed Round in 2025
ThreatMate is a cybersecurity company focused on protecting mid-sized enterprises from cyber threats and ensuring compliance with cybersecurity requirements. Founded by a team of experienced entrepreneurs and cybersecurity specialists, ThreatMate provides a comprehensive platform that integrates inquisitive security capabilities. This platform allows users to identify security weaknesses, facilitating informed decision-making for security operations teams and executive management. By streamlining the sales cycle and enhancing data protection, ThreatMate enables organizations to achieve a robust cybersecurity posture, safeguarding their critical information and overall business integrity.

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 specializes in offering a platform that integrates AI agents and assistants to enhance detection engineering capabilities for security teams. Its technology supports the processing of intelligence, the creation of new detection protocols, and the management of detection libraries. By utilizing generative AI-powered threat hunting and auto-investigation, System Two Security enables enterprise Security Operations Centers (SOCs) and managed security service providers to proactively identify and mitigate emerging threats. The platform focuses on profiling, detecting, and containing new adversaries, thereby enhancing clients' defenses against cyber threats and ensuring a safer operational environment.

SplxAI

Pre Seed Round in 2024
SplxAI is a cybersecurity company that specializes in automated security testing for AI chatbots. Its platform continuously monitors and tests chatbots for vulnerabilities, such as prompt injection and context leakage, and provides real-time detection and mitigation strategies. The platform offers multimodal pentesting capabilities, covering text, audio, and video, and generates comprehensive reports with actionable insights. SplxAI's solution integrates seamlessly with existing security frameworks and is trusted by enterprises seeking to proactively secure their AI assets and maintain data integrity.

StepSecurity

Seed Round in 2024
StepSecurity is a software security company that specializes in providing a comprehensive security platform for GitHub Actions, specifically designed to enhance the security of continuous integration and continuous delivery (CI/CD) pipelines. The platform is utilized by over 3,000 open-source projects, including notable organizations such as the Cybersecurity and Infrastructure Security Agency, Google, Microsoft, and Datadog. StepSecurity focuses on securing workflows by implementing minimum token permissions and dependency pinning, which helps clients strengthen their software supply chain security. Its enterprise solutions are actively deployed across various industries, including cryptocurrency, healthcare, and cybersecurity.

Dodgeball

Seed Round in 2024
Dodgeball is a technology company specializing in fraud prevention and customer trust operations. It provides an orchestration and automation platform designed for Trust & Safety teams who lack the engineering resources to build their own solutions. Dodgeball's no-code engine allows these teams to manage fraud tool integrations and policy definitions directly, offering a unified interface to investigate and manage visitor risk throughout the transaction journey. The company's Customer Data Platform links visitors across various tools, helping customers save time, enhance control, and mitigate regulatory risks.

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 company specializing in cybersecurity. It offers a platform that enables businesses to design, prioritize, and automate essential security activities. The platform identifies and assesses threats, manages risk, and facilitates the planning, prioritization, automation, and orchestration of security tasks. This helps businesses create, manage, and optimize their evolving cybersecurity programs effectively.

Keep Aware

Seed Round in 2023
Keep Aware is a developer of a human-centric browser security platform that offers a proactive and adaptable solution to protect against browser-based attacks. The platform leverages behavioral analytics to identify and block threats such as phishing, data loss, and malicious downloads. By focusing on the unique behavior patterns of individual users and groups, Keep Aware enables organizations across various sectors, including law firms, government entities, and professional services, to integrate security measures into their daily operations. This approach fosters a safety-first mindset, equipping clients to effectively address and mitigate risks associated with 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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