# StoneMill Ventures

> StoneMill Ventures is a VC fund in Arlington backing Cyber Security and Information Technology. See 45 investments, check sizes, portfolio. Updated Aug 2026.

- Type: VC Fund
- Location: Arlington, United States
- Total investments: 45
- Last investment: Feb 2024
- Lead investor: 2%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/company/stonemillvc/
- Website: https://www.stonemillventures.com

StoneMill Ventures is a VC fund in Arlington focused on Cyber Security and Information Technology. StoneMill Ventures invests in disruptive cyber security companies, primarily at the seed stage. StoneMill are active investors and look for founding teams that can benefit from our experience building pioneering security companies.

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Cyber Security | 23 | 51% |
| Information Technology | 15 | 33% |
| Software | 12 | 27% |
| Network Security | 10 | 22% |
| SaaS | 8 | 18% |

44 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Seed | 26 | 58% |
| Series A | 12 | 27% |
| Pre-Seed | 2 | 4% |
| Series B | 2 | 4% |
| Funding Round | 2 | 4% |

6 stages tracked in total.

### Country

| Country | Investments | Share |
| --- | --- | --- |
| United States | 24 | 53% |
| Israel | 6 | 13% |
| Canada | 2 | 4% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Todyl | 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 |  |
| LimaCharlie | 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 | 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 | Fixify is an AI powered managed service provider for IT support. | $7M | Seed | Jul 01, 2023 |  |
| Spera | 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 |  |
| Rewst | Rewst is a company currently operating in stealth mode. | $21.5M | Series A | Nov 09, 2022 |  |
| Valence Security | Valence enables security teams to find and fix SaaS risks. As SaaS complexity and distributed management present security challenges, the Valence SaaS security platform provides unparalleled and actionable insights into configuration, identity, data, SaaS-to-SaaS integration, and GenAI risks. The Valence platform offers comprehensive SaaS securityposture management (SSPM), risk remediation, and identity threat detection and response (ITDR). Valence’s unique remediation by choice capabilities allow security teams to leverage manual remediation, automated workflows and business user collaboration to scale their risk reduction and proactively secure their SaaS. Leading organizations leverage Valence to empower their business to securely adopt SaaS. | $25M | Series A | Oct 26, 2022 |  |
| Tidal Cyber | Tidal Cyber is a cybersecurity company that provides a threat-led defense platform. The platform maps adversary tactics, techniques, and procedures to measure the effectiveness of a security stack. The service helps teams prioritize defenses and reduce security risks by analyzing real-world threat behavior. | $4M | Seed | Oct 04, 2022 |  |
| Opus Security | Opus is a singular, overarching platform that connects existing tools and relevant stakeholders, and orchestrates the entire response and remediation processes across the organization based on tried-and-tested, easily-deployed processes. | $10M | Seed | Sep 13, 2022 |  |
| Binarly | Binarly is a global firmware and software supply chain security company founded in 2021. The company’s flagship Binarly Transparency Platform is an enterprise-class, AI-powered solution used by device manufacturers, OEMs, IBVs and product security teams to identify known and unknown vulnerabilities, misconfigurations and signs of malicious codeimplantation. Binarly’s validated remediation playbooks have significantly reduced the cost and time to respond to security exposures. Based in Los Angeles, California, Binarly brings decades of research and program analysis expertise to build solutions to protect businesses, critical infrastructure, and consumers around the world. | $3.6M | Seed | Jun 22, 2022 |  |

10 of 45 investments shown.

## Co-investors
- [YL Ventures](https://shizune.co/investors/profile/yl-ventures) — VC Fund, 10 deals together
- [Blu Venture Investors](https://shizune.co/investors/profile/blu-venture-investors) — VC Fund, 7 deals together
- [TechOperators Venture Capital](https://shizune.co/investors/profile/techoperators) — VC Fund, 6 deals together
- [Gula Tech Adventures](https://shizune.co/investors/profile/gula-tech-adventures) — VC Fund, 5 deals together
- [Paladin Capital Group](https://shizune.co/investors/profile/paladin-capital-group) — VC Fund, 5 deals together
- [Lytical Ventures](https://shizune.co/investors/profile/lytical-ventures) — VC Fund, 4 deals together

## Similar investors

### Similar stage
- [Antler](https://shizune.co/investors/profile/antler-be9c) — VC Fund
- [Alumni Ventures](https://shizune.co/investors/profile/alumni-ventures-group) — VC Fund
- [Right Side Capital Management](https://shizune.co/investors/profile/right-side-capital-management) — VC Fund

## FAQ

### What does StoneMill Ventures invest in?

StoneMill Ventures invests primarily in Cyber Security, Information Technology and Software startups, most often at Seed and Series A stage. Most of the 45 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### When did StoneMill Ventures last invest?

The most recent investment recorded for StoneMill Ventures closed in Feb 2024. Shizune tracks 45 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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