Marathon Venture Capital
Venture capitalAthens · Seed–Series B · 6 people tracked
Investment thesis
Marathon Venture Capital backs founders building foundational technologies for the future. The firm leads seed rounds and aims to provide comprehensive support and expertise to each portfolio company. It emphasizes transparency, sharing its terms and processes with founders upfront to avoid surprises. Recent investments span AI-native security, governance for AI-generated software, AI site reliability, and biopharma digital infrastructure, indicating a focus on AI, enterprise software, and cybersecurity. Marathon also fosters a global community, hosting events across multiple countries to connect its team with founders and peers.
Source: firm website, verified Aug 3, 2026.
Team · 6 people
from the firm's website & public directories
What they invest in
from 16 of 38 portfolio companiesAI & Machine Learning ×8Developer Tools ×5Robotics ×4Data & Infrastructure ×3EdTech ×3Enterprise Software ×3Hardware ×3SaaS ×3
HQs:United States×3Switzerland×1Germany×1
Investments · 38 tracked
founders shown can be your intro pathBy year:2023 · 12018 · 12 dated
Velos Rotors designs and manufactures electric, heavy-lift UAV helicopters for cargo logistics, infrastructure inspection, surveying, and search-and-rescue operations across energy, industrial, maritime, and defense sectors.
Defense TechHardwareRoboticsWilmington, US
Tasso Argyros(Director)George Tziralis(Director)Aris Kolokythas(Director)Michael Seal(Executive Officer, Director)Jouko Salo(Chief Strategy Officer)
Board seatGeorge Tziralis· per SEC Form D
Ventura, US
YORAM NELKIN(Director)SOTIRIS BANTAS(Executive Officer, Director, Promoter)ABRAHAM NETHANEL REICHENTAL(Executive Officer, Director)VASILEIOS SOTIROUDAS(Director)ION TSAKONAS(Director)CHRISTINE LERIOS(Executive Officer)
DataForm Lab builds software for design and manufacturing automation in offsite construction, integrating design workflows with robotic manufacturing.
Advanced ManufacturingConstruction TechRobotics
Hack The Box provides hands-on training and simulation platforms for cybersecurity blue teams, including labs, courses, and incident response exercises designed to develop skills in SOC operations, digital forensics, and threat hunting.
CybersecurityDeveloper ToolsEdTechEnterprise Software
Hack The Box operates a cybersecurity training and skills platform offering hands-on labs, simulations, assessments, and cyber ranges for individuals, enterprises, and public sector organizations.
AI & Machine LearningCybersecurityEdTech
ICONIQ Capital's investment management arm builds investment portfolios for influential families and mission-driven institutions, aiming to compound returns from diverse sources by leveraging its community and capital network.
FintechSector Agnostic
Wilmington, US
Panagiotis Papadopoulos(Director)Ioannis Stamelos(Director)Ilias Koromilas(Director)Christoforos Kachris(Executive Officer, Director)
LearnWorlds is an AI-powered learning management system (LMS) designed for learning businesses to run multi-client training operations, create and sell online courses, and track learner outcomes.
AI & Machine LearningEdTechSaaS
LearnWorlds Founders
Lenses builds software that simplifies management and access to streaming data across hybrid infrastructure, enabling development teams to work independently without central bottlenecks.
AI & Machine LearningData & InfrastructureDeveloper ToolsEnterprise Software
Andrew Stevenson(CTO)Guillaume Aymé(CEO)
An AI SRE that ensures systems are running in the age of AI-generated code
An AI-native security platform to help enterprises safely use autonomous agents
SMPnet provides utilities and power generators with software for power grid management and control, including its Omega product suite for autonomous grid operations.
CleantechEnergySaaS
Straion is a system for engineering teams that centralizes architecture rules, security policies, and coding standards and automatically delivers the relevant ones to developers' AI coding agents, validating proposed task plans against them before code is written.
AI & Machine LearningDeveloper ToolsEnterprise Software
Frequently asked questions
- What stage does Marathon Venture Capital invest at?
- Marathon Venture Capital invests at the Seed, Series A, Series B stages.
- What is Marathon Venture Capital's typical check size?
- Marathon Venture Capital typically writes checks of $250K – $1M.
- What sectors does Marathon Venture Capital focus on?
- Marathon Venture Capital focuses on AI & Machine Learning, Biotech, Cybersecurity, Enterprise Software, SaaS, Sector Agnostic.
- Where is Marathon Venture Capital located?
- Marathon Venture Capital is headquartered in Athens, GR.
- Does Marathon Venture Capital lead rounds?
- Yes, Marathon Venture Capital leads investment rounds.
Images
Co-investors · 27
Hardware Club is a selective community for hardtech companies worldwide that facilitates knowledge-sharing and networking among members to accelerate growth and reduce costly mistakes.
83North is a global venture capital firm that invests in and helps entrepreneurs build large, category-leading companies across Europe, Israel, and the US.
Visionaries Club is a European venture capital firm backing early-stage B2B and AI-driven technology companies, connecting top founders with a network of leading tech operators and industrial family entrepreneurs who serve as LPs, mentors and customers.
Runa Capital is a global venture capital firm founded by serial entrepreneurs, focused on early-stage software and deep tech startups worldwide.
Air Street Capital is a venture capital firm that backs AI-first companies, typically investing at the earliest stages.
Andreessen Horowitz's Strategic Partnerships page describes collaborations that connect its portfolio companies with established institutions to help scale and deploy their technology.
New Enterprise Associates (NEA) is a venture capital firm that invests in and provides long-term support to founders building new companies.
Streamlined Ventures is an early-stage venture firm that partners with founders and invests at the seed stage to help build large-scale companies.
Quiet Capital is an early-stage venture firm run by builders who back founders from day zero.
FundersClub is an online venture capital firm run by startup founders and VCs based in Silicon Valley, providing portfolio companies with software tools and a global network to support their growth.
Pioneer Fund is a venture capital firm investing in the top Y Combinator startups.
Lookout Ventures provides seed-stage funding to enterprise technology companies outside Silicon Valley, with partner expertise in AI, cybersecurity, infrastructure software, and vertical SaaS.
▶15 more co-investors
Hack VCThreshold VenturesMatrixUncorrelated VenturesEntrepreneur FirstWinklevoss CapitalCP VenturesUP PartnersAngular VenturesNeotribe VenturesMarket One CapitalVentureFriendsConnectivity VenturesCreator Fund500 Emerging Europe
Firms observed investing alongside Marathon Venture Capital, from public investor directories. Shared companies are the overlap with Marathon Venture Capital's recorded portfolio.
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