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 pioneering cybersecurity company focused on serving mid-sized businesses. Founded by seasoned entrepreneurs and cybersecurity experts, ThreatMate offers an innovative platform that combines comprehensive security capabilities to safeguard companies from evolving cyber threats.

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 provides an AI-driven platform that assists detection engineering teams in processing threat intelligence, creating new detections, and managing detection libraries. The system enables users to draft and refine detections based on threat intelligence and coverage gaps.

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 offers a robust security solution tailored for GitHub Actions users concerned about CI/CD pipeline vulnerabilities. Trusted by over 3000 open-source projects and enterprises in crypto, healthcare, and cybersecurity sectors.

Dodgeball

Seed Round in 2024
Dodgeball streamlines trust and safety operations for teams lacking engineering resources. Its no-code platform integrates fraud tools, defines policies, and provides a unified view of visitor risk across transactions.

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 offers a proactive browser security solution that adapts to individual user behaviors and evolving threats. Its platform uses behavioral analytics to block phishing attempts, prevent data loss, and safeguard enterprises from web-based attacks while maintaining a seamless employee experience.

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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