Michael Sutton
Angel Investor · Founder at StoneMill Ventures
Arlington, United States
Michael Sutton is a seed investor at StoneMill Ventures in Arlington focused on Cyber Security and Information Technology. Michael Sutton is the Co-Founder of Runtime Ventures and Founder of StoneMill Ventures. He attended the George Washington University.
- Total investments:
- 57
- Last investment:
- Lead investor:
- 4%
Last updated:
For AI agents: llms.txt
Industries Michael Sutton invests in
Stages Michael Sutton invests in
Countries Michael Sutton invests in
Round sizes
Contacts
| Type | Contact | Validation |
|---|---|---|
| Work email | ||
| Personal email | ||
| Work phone | ||
| Personal phone | ||
| Socials |
Round size
- Seed
- $1.8M–$9.8M
- Pre-Seed
- $600k–$3.6M
- Series A
- $5M–$25M
Investment Focus
Industry
- Cyber Security 26 (46%)
- Information Technology 16 (28%)
- Software 14 (25%)
- Network Security 10 (18%)
- SaaS 9 (16%)
Stage
- Seed 30 (53%)
- Series A 12 (21%)
- Pre-Seed 3 (5%)
- Funding Round 3 (5%)
- Series B 2 (4%)
Country
- United States 28 (49%)
- Israel 6 (11%)
- Canada 2 (4%)
Investments
| Company | Description | Round | Links |
|---|---|---|---|
| AiStrike is committed to solving security investigation and response challenges for modern organizations with AI-powered automation. By reducing alert volume by up to 85%, AiStrike helps security teams overcome alert fatigue, while enriching and prioritizing critical alerts for smarter decision-making and faster mean time to resolution (MTTR). WithAiStrike, organizations gain the advantage of real-time alert triage, guided investigation, and automated response – all within one intuitive platform. AiStrike’s custom AI models are run locally, ensuring data privacy and security. | $7M / Seed / Nov 12, 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 includereal-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. | $7M / Seed / Mar 26, 2025 | ||
| ThreatMate revolutionizes cybersecurity by offering a single platform with inquisitive security capabilities for the middle market. The company was founded by a team of serial entrepreneurs and cybersecurity experts that aims to protect mid-sized companies from cyber threats. | $3.2M / Seed / Feb 06, 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 includereal-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. | $2M / Pre-Seed / Sep 10, 2024 | ||
| StepSecurity provides a comprehensive security platform for GitHub Actions. If you are using GitHub Actions for CI/CD and are worried about the security of CI/CD pipelines, StepSecurity platform is for you. Over 3000 open-source projects, including those from Cybersecurity and Infrastructure Security Agency (CISA), Google, Microsoft,Datadog, Kubernetes, Node, and Ruby, use StepSecurity to harden their CI/CD pipelines. Our enterprise tier is currently deployed at customers in the crypto, healthcare, and cybersecurity industries. | $3M / Seed / May 01, 2024 | ||
| Todyl empowers businesses of any size with a complete, end-to-end security program. The Todyl Security Platform converges SASE, SIEM, Endpoint Security, GRC, MXDR, and more into a cloud-native, single-agent platform purpose-built for MSPs, MSSPs, and Mid-Market IT professionals. Each module is designed to be deployed in a targeted, agileapproach to meet any use case. When all modules are combined, our platform becomes a comprehensive security solution that is cloud-first, globally accessible, and features a highly intuitive interface. With Todyl, your security stack becomes one comprehensive, consolidated, and customizable platform, making security more intuitive and streamlined to combat modern threats. Our platform helps to eliminate the complexity, cost, and operational overhead traditional approaches to cybersecurity require, empowering teams with the capabilities they need to protect, detect, and respond to cyberattacks. | $50M / Series B / Feb 26, 2024 | ||
| Security Infrastructure as a Service (SIaaS).LimaCharlie abstracts away the hard parts of information security and delivers them on-demand (or à la carte) at scale in a manner similar to any major cloud provider drastically reducing costs and effort. We supply all the tools to run an MSSP or SOC as well as providing API’s that allow users tobuild and monetize their own products. | $10.2M / Series A / Feb 08, 2024 | ||
| Aim Security is the industry to secure GenAI adoption, providing security executives with the power to boost business productivity while providing the necessary safeguards and assuring proactive protection for all use cases across the organization, whether corporate or production. Leading CISOs and security practitioners through their secure GenAIjourney, | $10M / Seed / Jan 29, 2024 | ||
| Fixify is an AI powered managed service provider for IT support. | $7M / Seed / Jul 01, 2023 | ||
| Spera is an identity security posture management platform that acts as a force multiplier for identity teams - helping detect, prioritize, and remediate identity-driven breaches. | $10M / Seed / Mar 29, 2023 | ||
| See all 57 investments → | |||
Co-Investors
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FAQ
What does Michael Sutton invest in?
Michael Sutton invests primarily in Cyber Security, Information Technology and Software startups, most often at Seed and Series A stage. Most of the 57 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio.
What is Michael Sutton's check size?
Michael Sutton typically joins rounds of $1.8M–$9.8M at Seed, $600k–$3.6M at Pre-Seed and $5M–$25M at Series A. These ranges are 10th–90th percentile round sizes calculated from confirmed public funding rounds, so they are a realistic guide to the rounds Michael Sutton participates in.
How do I contact Michael Sutton?
Public channels for Michael Sutton include LinkedIn, X (Twitter) and the website linked on this profile. For a verified work email and phone number, create a free Shizune account — contact data is searched across 20+ sources and validated before delivery, so your outreach lands in the right inbox.
When did Michael Sutton last invest?
The most recent investment recorded for Michael Sutton closed in Nov 2025. Shizune tracks 57 investments in total for this profile, including round sizes, stages and portfolio companies, all sourced from confirmed public funding rounds and refreshed monthly.
Is Shizune's investor data accurate?
Yes — every stat on this profile is calculated from confirmed public funding rounds monitored across hundreds of sources since 2020. This profile was last refreshed in Aug 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.
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