Fundraising FoxStoneMill Ventures
Angel networkWashington · Seed
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Investment thesis
StoneMill Ventures backs disruptive cybersecurity companies, primarily at the seed stage. The firm positions itself as an active, hands-on investor that looks for founding teams who can benefit from its operating experience building pioneering security companies. It concentrates its activity in the Washington, DC metro area where it can be closely involved, but will invest globally when the right opportunity arises. Beyond capital, the firm offers mentorship, seeking passionate entrepreneurs aiming to disrupt key parts of the security ecosystem.
Source: firm website, verified Aug 7, 2026.
What they invest in
from 27 of 37 portfolio companiesCybersecurity ×21Enterprise Software ×17SaaS ×17AI & Machine Learning ×12Cloud Computing ×6Data & Infrastructure ×4Defense Tech ×3Developer Tools ×2
HQs:United States×18Canada×1
Who they back
founder profiles across 24 portfolio companiesFounding team size:solo founder×52 founders×123 founders×64+ founders×1
Where their founders studiedfrom 24 founders with education data
University of Maryland ×5Bar-Ilan University ×2Georgia Institute of Technology ×2The Hebrew University of Jerusalem ×2
What their founders studiedfrom 20 founders with field-of-study data
Computer Science ×11Engineering ×6Business & Management ×3
Where their founders worked beforefrom 27 founders with career history
YL Ventures ×4ManTech ×2ManTech International Corporation ×2US Navy ×2
1 founders hold a PhD · 2 hold an MBA (of 23 with degree data)
Investments · 37 tracked
founders shown can be your intro pathBy year:2024 · 22022 · 12021 · 12020 · 15 dated
Test range infrastructure for autonomous vehicles (unmanned aerial, ground, and marine systems) serving commercial and defense sectors.
Defense TechHardwareRoboticsDuluth, US
Matt Thomasson(Executive Officer)Steven Witt(Executive Officer, Director)Michael Cutrone(Director)Laura Barr(Director)
BoardCyndi Gula(Director)in
PartnerMichael Sutton· solo GP
Co-investorsCapital InnovatorsGula Tech AdventuresPerot JainPJC
Enterprise networking (Wi-Fi, switches, SD-WAN) with cloud-managed security for campuses & branches
Keerti Melkote(Founder)Pankaj Manglik(Founder)
Co-investorsAmplify PartnersArtis VenturesAsset Management CompanyCervinGolub GrowthICCP Venture Partners+12 more
Atomicorp provides security and compliance automation for workloads deployed across cloud and datacenter environments, built on the OSSEC open source foundation.
Cloud ComputingCybersecurityDeveloper ToolsEnterprise SoftwareSaaS
Scott Shinn(CTO and co-founder)inMichael Shinn(CEO and co-founder)in
PartnerMichael Sutton· solo GP
Co-investorsBlu Venture InvestorsLeawood Venture Capital Llc
PartnerMichael Sutton· solo GP
Co-investorsMaryland TEDCOOld Line Capital PartnersTEDCO
Santa Monica, US
Alex Matrosov(Founder)Alex Matrosov Claudiu Teodorescu(Founder)
PartnerMichael Sutton· solo GP
Co-investorsCanaan PartnersCisco InvestmentsOlive Tree CapitalTwo Bear CapitalBlu Venture InvestorsEmerging Ventures
Cybrary provides online cybersecurity training courses, certification prep programs, and hands-on labs for individuals and enterprise teams.
CybersecurityEdTechSaaSRiverdale, US
Ryan J. Cory(Executive Officer, Director)Ralph, Jr. P. Sita(Executive Officer, Director)inJeremy Gehring(Executive Officer, Director)
BoardKlee Kleber(Executive Officer, Director)inRon Gula(Director)inJim Curry(Director)in
PartnerMichael Sutton· solo GP
Co-investorsBuildGroupGula Tech AdventuresInner Loop CapitalNew Stack VenturesArthur Ventures
DeepSig develops machine learning software for wireless communications, specializing in signal processing, spectrum sensing, and 5G optimization.
AI & Machine LearningDeep TechDefense TechArlington, US
James Shea(Founder)inTim O'Shea(Founder)inBrendan Fallis(Director)Wesley Blackwell(Director)
PartnerMichael Sutton· solo GP
Co-investorsScout VenturesScout VenturesBlu Venture InvestorsLeawood Venture Capital LlcLockheed Martin Ventures
Feroot discovers and monitors third-party scripts, tags, and trackers on websites to detect malicious or unwanted code and block threats.
CybersecurityEnterprise SoftwareSaaSToronto, CA
Ivan Tsarynny(Founder)inVitaliy Lim(Founder)in
PartnerMichael Sutton· solo GP
Co-investorsNEXT AITrue VenturesY CombinatorAndros15 VenturesHaystackIndustry Ventures+2 more
Fixify provides an AI-assisted IT service desk that integrates with a customer's existing ticketing and productivity tools to automate routine support tasks, backed by a human team that handles designated issue categories.
AI & Machine LearningEnterprise SoftwareSaaS
Mase Issa(Founder)Matt Peters(Founder)Peter Silberman(Founder)
PartnerMichael Sutton· solo GP
Co-investorsAviso VenturesDecibel PartnersPaladin Capital GroupScale Venture PartnersCostanoa Ventures
Fleet Device Management is the company behind an open-source device management platform that enrolls millions of laptops, servers, and other devices across Apple, Linux, Windows, and Android.
CybersecurityDeveloper ToolsEnterprise SoftwareSan Francisco, US
Zach Wasserman(Cofounder)inMike McNeil(CEO)in
BoardReid Christian(Director)inMark Hatfield(Director)inSuresh Batchu(Director)in
PartnerMichael Sutton· solo GP
Co-investorsCRV (Charles River Ventures)Moonfire VenturesOpen Core VenturesTen ElevenCota CapitalGTMfund
Gradient Works provides a territory design platform that connects account scoring, territory planning, book management, lead routing, and pipeline analytics for B2B commercial sales teams.
AI & Machine LearningEnterprise SoftwareSaaSSales TechAustin, US
Hayes Davis(Co-Founder & CEO)in
Co-investorsFrontera Technology VenturesStage 2 CapitalAnthos CapitalGula Tech Adventures
GreyNoise collects primary scanning and exploitation data to provide actionable threat intelligence for cybersecurity defenders.
CybersecurityData & InfrastructureEnterprise SoftwareWashington, US
Andrew Morris(Founder)inAsh Devata(Chief Executive Officer)in
PartnerMichael Sutton· solo GP
Co-investorsCRV (Charles River Ventures)Gula Tech AdventuresIn-Q-TelInner Loop CapitalPaladin Capital GroupRadian Capital
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Grip provides security tooling that discovers and classifies risk across SaaS services and web apps, identifying risky identities and accounts to help security teams close gaps, prioritize access controls, and maintain SaaS and identity compliance.
AI & Machine LearningCloud ComputingCybersecurityEnterprise SoftwareSaaS
Lior Yaari(Founder)inAlon Shenkler(Founder)Idan Fast(Founder)
PartnerMichael Sutton· solo GP
Co-investorsIntel CapitalThird Point VenturesYL Ventures
GroupSense develops patented cyber reconnaissance and threat intelligence technology to help organizations manage the volume of threat intelligence data.
CybersecurityEnterprise SoftwareSaaSArlington, US
Kurtis Minder(Executive Officer, Director, Promoter)inKelly Milan(Executive Officer, Director)Deborah Pearce(Executive Officer)Tom Richards(Executive Officer)Michael Kostoff(Director)Adam Bregenzer(Executive Officer)in
PartnerMichael Sutton· solo GP
Co-investorsIrishAngelsThree Tree Ventures
PartnerMichael Sutton· solo GP
Co-investorsEntrepreneurs Roundtable Accelerator (ERA)
Huntress provides enterprise-grade cybersecurity solutions designed for businesses of all sizes, focusing on threat detection and response to protect organizations against hackers.
AI & Machine LearningCybersecurityEnterprise SoftwareSaaSColumbia, US
Kyle Hanslovan(Founder)inChris Bisnett(Founder)inJohn Ferrell(Founder)inMarcos E. Torres(Executive Officer)in
BoardErnie Bio(Director)inSuken Vakil(Director)in
PartnerMichael Sutton· solo GP
Co-investorsBlu Venture InvestorsBroad Street AngelsForgePoint CapitalGula Tech AdventuresJMI EquityKleiner Perkins+9 more
LimaCharlie provides security infrastructure for MSSPs and enterprise security teams, using AI "agentic operators" that connect to clients' existing tools via API to automate queue work such as email quarantine, endpoint approvals, DLP violations, and alert triage.
AI & Machine LearningCybersecuritySaaS
PartnerMichael Sutton· solo GP
Co-investorsHumba VenturesIronGate Capital AdvisorsLytical VenturesStrategic Cyber VenturesStreamlined VenturesCoFound Partners Venture+6 more
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Link Labs builds IoT-based real-time location and asset-tracking systems that provide indoor and outdoor visibility of equipment, inventory, and personnel for manufacturing and logistics operations.
Advanced ManufacturingIoTLogistics & Supply ChainAnnapolis, US
Robert B. Proctor(Executive Officer, Director)Brian E. Ray(Executive Officer, Director)in
BoardChristopher G. College(Director)in
Co-investorsTCP Venture CapitalBlu Venture Investors
New York, US
Edwin Upchurch(Executive Officer, Director)Peter Kogge(Executive Officer, Director)Jay Brockman(Executive Officer)Michael J Maulick(Executive Officer, Director)Martin Deneroff(Executive Officer)
BoardJames Hunt(Director)
PartnerMichael Sutton· solo GP
Co-investorsIrishAngels
Orca Security offers an agentless cloud security platform (CNAPP) that scans cloud accounts, code, containers, and AI workloads to detect, prioritize, and remediate risks from development through runtime.
Cloud ComputingCybersecuritySaaSPortland, US
Gil Geron(Founder)inAvi Shua(Founder)inEty Spiegel Hubara(Founder)inLiran Antebi(Founder)inMatan Ben Gur(Founder)inShay Filosof(Founder)in
PartnerMichael Sutton· solo GP
Co-investorsCapitalGCisco InvestmentsFlyover CapitalHarmony PartnersICONIQLauder Partners+6 more
RackTop Systems develops BrickStor, a cyberstorage platform that actively defends data against ransomware, insider threats, and data theft through inline inspection and real-time response at the storage layer.
CybersecurityData & InfrastructureDefense TechWashington, US
Eric Bednash(Co-founder)inJonathan Halstuch(Co-founder)in
PartnerMichael Sutton· solo GP
Co-investorsEastward Capital PartnersGrotech VenturesGula Tech AdventuresMaryland TEDCORazor's Edge VenturesTEDCO
runZero provides an exposure management platform that discovers and fingerprints IT, OT, IoT, cloud, mobile, and remote assets without agents or credentials, giving security teams visibility into their attack surface.
AI & Machine LearningCybersecurityIoTSaaS
HD Moore(Founder; Chief Research Officer of Dragos)in
BoardRobert M. Lee(Chairman and CEO of Dragos)in
PartnerMichael Sutton· solo GP
Co-investorsDecibel PartnersRain Capital
SCYTHE is a continuous Adversarial Exposure Validation (AEV) platform that emulates real adversary techniques (mapped to MITRE ATT&CK) against an organization's actual IT, cloud, and OT/ICS environments to validate that detection, alerting, and response controls work.
AI & Machine LearningCybersecurityEnterprise SoftwareSaaSArlington, US
Bryson Bort(Chief Executive Officer)in
PartnerMichael Sutton· solo GP
Co-investorsEnergy Impact PartnersGula Tech AdventuresEvolution Equity PartnersSaas Ventures, L.L.C.Hacker.Capital LLCInner Loop Capital+4 more
A data security platform that detects sensitive data, monitors its movement across endpoints, browsers, SaaS, GenAI workflows and cloud environments, and blocks unauthorized data exfiltration.
Cloud ComputingCybersecurityData & InfrastructureEnterprise SoftwareSaaS
PartnerMichael Sutton· solo GP
PartnerMichael Sutton· solo GP
Tidal Cyber develops tools and services that help enterprises adopt MITRE ATT&CK framework for threat-informed defense.
CybersecurityEnterprise Software
PartnerMichael Sutton· solo GP
Co-investorsAccess Venture PartnersBright Pixel CapitalDreamit VenturesGlasswing VenturesTFX CapitalAccess Ventures+10 more
Todyl provides a unified cybersecurity platform for MSPs, IT, and security professionals to defend against threats, manage risk, and maintain compliance.
CybersecurityEnterprise SoftwareSaaSDenver, US
John G. Nellen III(Executive Officer, Director)John Nellen(Founder)
BoardSaid Mohammadioun(Director)in
PartnerMichael Sutton· solo GP
Co-investorsTechOperators Venture CapitalAnthos CapitalBase10 PartnersBlu Venture InvestorsTechnology Operators
Weehawken, US
Nazario Parsacala(Founder)
PartnerMichael Sutton· solo GP
Co-investorsCanaan PartnersEvolution Equity PartnersLytical VenturesShasta Ventures
Valence provides a SaaS security platform that builds a complete inventory of sanctioned, unsanctioned, and shadow IT and AI applications, detecting risky integrations, OAuth tokens, service accounts, and non-SSO access.
AI & Machine LearningCybersecurityEnterprise SoftwareSaaS
Yoni Shohet(Founder)in
PartnerMichael Sutton· solo GP
Co-investorsAlumni VenturesM12 (Microsoft's Venture Fund)YL VenturesStageOne Ventures
Verisign operates critical internet infrastructure, serving as the registry for the .com and .net top-level domains and as the Root Zone Maintainer for the global Domain Name System.
Cloud ComputingCybersecurityData & InfrastructureEnterprise Software
Jim Bidzos(Founder)inJames Bidzos(Founder)
Co-investorsBessemer Venture PartnersEverest GroupKleiner PerkinsMobility VenturesVedanta CapitalWestern Technology Investment+1 more
VISO TRUST is an AI-powered third-party risk management (TPRM) platform that helps security teams assess and monitor vendor cyber risk across 3rd, 4th, and nth parties.
AI & Machine LearningCybersecuritySaaS
Paul Valente(Founder)inRussell Sherman(Founder)
PartnerMichael Sutton· solo GP
Co-investorsBain Capital VenturesCisco InvestmentsGTM CapitalLytical VenturesRecall CapitalSierra Ventures+1 more
Tenable provides an AI-powered exposure management platform that unifies security visibility, insight, and action across an organization's entire attack surface, including infrastructure, cloud, identity, and operational technology environments.
AI & Machine LearningCybersecurityEnterprise Software
Roy Hodir(Founder)Tal Morgenstern(Founder)Yaniv Bar-Dayan(Founder)
PartnerMichael Sutton· solo GP
Co-investorsDawn CapitalTen ElevenWipro Ventures
Zscaler operates a cloud-based cybersecurity platform built on Zero Trust architecture to protect users, workloads, branches, and devices across an inline security cloud.
Cloud ComputingCybersecurityEnterprise SoftwareSan Jose, US
Jay Chaudhry(Founder)inRobert Schlossman(Executive Officer)inRemo Canessa(Executive Officer)inSyam Nair(Executive Officer)inCharles Giancarlo(Director)Karen Blasing(Director)
Co-investorsAlphaDriveAnsa CapitalaVentureBright Pixel CapitalCapitalGDell Technologies Capital+3 more
Other
Tracked investments with no reachable website or further public details — typically companies that wound down, renamed, or were absorbed.
Cyr3Con
Exits · 3
3 acquisitions · showing 2Arubaacq. by Hewlett-PackardVulcan Cyberacq. by Tenable
Portfolio news
latest coverage across their companies
Huntress · forgeglobal.com · Sep 17, 2026
Todyl · todyl.com · Jan 9, 2026
Tidal · finsmes.com · Sep 3, 2025
Frequently asked questions
- How many investments has StoneMill Ventures made?
- StoneMill Ventures has 37 tracked investments, 3 of which have exited.
- What stage does StoneMill Ventures invest at?
- StoneMill Ventures invests at the Seed stage.
- What is StoneMill Ventures's typical check size?
- StoneMill Ventures typically writes checks of $100K – $1M.
- What sectors does StoneMill Ventures focus on?
- StoneMill Ventures focuses on Consumer, Cybersecurity, Data & Infrastructure, Enterprise Software, Hardware, SaaS.
- Where is StoneMill Ventures located?
- StoneMill Ventures is headquartered in Washington, US.
- Does StoneMill Ventures lead rounds?
- StoneMill Ventures typically participates in rounds rather than leading them.
- Who does StoneMill Ventures co-invest with?
- StoneMill Ventures most often shares deals with Gula Tech Adventures, YL Ventures, Cisco Investments, among 108 tracked co-investors.
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