Runtime Ventures
1410 N Herndon St, Arlington, VA, 22201, United States
Overview
Runtime Ventures is unique among US venture firms, focusing on pre-seed and seed stage cybersecurity investments. We target ambitious founders building the future of the secure enterprise.
- Total investments
- 13
- Lead investments
- 3
- Investments · 12mo
- 3
- Active investors
- 2
Sector focus
- Cyber Security
Investment portfolio
- Bloom Security
Participated · Seed · Jul 2026
Bloom Security offers a platform that surfaces every tool, browser extension, agent, and code package running on an endpoint and provides contextual analysis of how each interacts with data and systems. The platform assesses supply-chain risk and configurations to measure exposure and enables teams to block risky installs, enforce secure configurations, and remediate risks without manual approval workflows. The company says its product addresses gaps in traditional endpoint detection and response solutions that were built for malware rather than modern, agentic software ecosystems. Bloom is already deployed at dozens of large enterprises across the United States and Europe and employs roughly 30 people. Its founding team previously held engineering and research leadership roles at Palo Alto Networks, Dig Security, and Demisto.
- AiStrike
Participated · Seed · Jan 2026
AiStrike is a San Francisco–based cybersecurity company that has built an end-to-end, AI-native platform designed to deliver preemptive cyber defense rather than traditional reactive security operations. Its agentic AI unifies threat intelligence, exposure analysis, detection engineering, investigation, and response, connecting directly to alert sources and edge systems without relying on centralized SIEM architectures. The platform is offered as “Agentic Cyber Defense as a Service,” allowing customers to focus on security outcomes while AiStrike continuously tunes and optimizes autonomous defense agents. In production across global enterprises and government organizations, the system has executed over 5 million investigations in the past year, yielding 90 % fewer false positives, 40 % broader detection coverage, and cutting investigation times from hours to minutes while halving security-operations costs. AiStrike plans to use its new capital to scale this agentic AI platform and further establish preemptive cyber defense as the operating model for modern security teams. By eliminating fragmented tooling and MDR overhead, the company aims to help organizations stay ahead of increasingly AI-driven threats. Financial details beyond the recent seed round have not been disclosed.
- SolidCore.ai
Led · Seed · Oct 2025
SolidCore.ai offers an end-to-end risk identification and governance platform built to deliver continuous monitoring and compliance for first-party enterprise generative AI deployments. The system serves as a system of record, giving customers real-time observability, rapid discovery, and recommended remediation for issues such as misconfigurations, policy violations, and anomalous usage patterns. It supports large-language-model applications running on AWS and Azure, and allows companies to customize risk categories and alert thresholds to fit their internal processes and risk appetites. The product is available today and can be used both for ongoing monitoring and periodic compliance testing. Led by co-founders Eric Chiu and Hemma Prafullchandra, the Menlo Park-based startup plans to use its recent funding to expand operations and accelerate product development. No revenue, customer, or other operating metrics were disclosed.
- RunReveal
Participated · Seed · Aug 2025
RunReveal is an Austin, TX-based security data platform provider that aims to replace legacy SIEM with an AI-native detection and response platform. Its unified platform offers data infrastructure for ingestion, normalization, transformations, routing, and long-term data retention that fits into any environment. The product includes AI-powered workflows such as autonomous investigations, native AI chat, alert triage and continuous monitoring. It also provides detection and investigation features including managed out-of-the-box detections, detections-as-code and fast search. RunReveal supports deep integrations, with 40+ integrations designed to understand how customers' tools actually work. The company is led by Evan Johnson and Alan Braithwaite and will use new funding to scale the team and accelerate platform development. RunReveal builds a customizable SIEM/security data platform using open-source technology to let security teams tailor log formats, visualizations, and enrichment. The platform is designed to support both established enterprises and newly launched businesses with limited security data. Its interface enables quick searches to investigate incidents swiftly, and the company emphasizes transparent pricing with a free tier offering up to 20GB of logs per month. RunReveal was founded in 2023 by Evan Johnson and Alan Braithwaite and is based in Austin, TX. The company plans to scale its team and roll out additional offerings using the newly raised capital.
- SplxAI
Participated · Seed · Mar 2025
SplxAI offers a platform built to automate offensive security testing, dynamic remediation, and continuous monitoring for agentic AI and LLM-powered applications. The platform simulates adversarial scenarios across modalities including text, images and voice, leveraging a continuously updated attack database. SplxAI also published an open-source tool, Agentic Radar, to map dependencies and expose missing security measures in agentic workflows. The company emphasizes automated red teaming to find prompt injections, hallucinations, and other AI-specific vulnerabilities that manual testing cannot scale to address. Named customers include KPMG, Infobip, Brand Engagement Network, and Glean. SplxAI was founded in 2023, is based in Dover, Del., and has reported 127% quarter-over-quarter growth since launching the platform in August 2024. SplxAI is a London, UK-based cybersecurity company focused on safeguarding AI applications and chatbots for enterprises, startups, and scaleups. Its flagship product, Probe, is an advanced security platform designed to support CISOs within large enterprises by identifying vulnerabilities in AI chatbots and providing immediate protection. The company employs a dual approach of both attacking and defending chatbots to detect and mitigate AI threats such as prompt injection, social engineering, off-topic conversations, jailbreaks, and more. Led by CEO Kristian Kamber, SplxAI raised $2M in pre-seed funding to accelerate development of Probe. The company offers cybersecurity services tailored to large enterprises' security teams as well as smaller organizations and scaleups.