Marathon Venture Capital is a seed-stage venture capital firm based in Athens, Greece, that helps ambitious Greek and European founders build world-class technology companies. It recently closed its third fund at €75 million in an oversubscribed single closing.
Deal activity decreased year-over-year (1 deal in the last 12 months vs 4 prior). Average disclosed round size is $43.4M (across 36 rounds with reported amounts).
Portfolio
37
Fund Size
$85M
Top Stage
Seed
Last 12 Mo
1
Team
Portfolio Breakdown
Stage Distribution
Sector Distribution
Investment Activity
DealsAvg Round Size
Portfolio
47 investments
| Company | Round | Amount | Date |
|---|---|---|---|
 Straion | Seed | — | Jan 2026 |
| PPolymodels Hub | Series A | — | Nov 2025 |
 Niural | Series A | $31M | Jun 2025 |
 Mercury | Series C | $300M | Mar 2025 |
| Mercury | Series C | $300M | Jan 2025 |
 Delian | Series A | $14M | Jan 2025 |
 Getboon | Series A | $20.5M | Dec 2024 |
 Boon | Series A | $20.5M | Dec 2024 |
| PPolymodels Hub | Seed | $1.4M | Jul 2024 |
 Dataform Lab | Seed | — | Jun 2024 |
 Polymodels | Series A | — | Jan 2024 |
 Bota Systems | Seed | $2.5M | Oct 2023 |
 Causaly | Series B | $60M | Jul 2023 |
 Velos Rotors | Seed | $2M | Apr 2023 |
 Hack The Box | Series C | $55M | Jan 2023 |
 Estoca | Unknown | $32M | Jan 2023 |
| Causaly | Series A | $60M | Jan 2023 |
 Welbe | Pre-Seed | $3M | May 2022 |
| CCube Rm | Series A | $8M | Dec 2021 |
| SShanghai MediTrust Health Technology Co., Ltd. | Series C | $308M | Aug 2021 |
 Learnworlds | Growth | $32M | Jul 2021 |
 Avenger Flight Group LLC | Unknown | $155M | Jul 2021 |
| Hack The Box | Series A | $10.6M | Apr 2021 |
 Connectly | Seed | $4M | Feb 2021 |
 SHUKUN | Series B | — | Jan 2021 |
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Top Co-Investors
Marathon5 shared
Nazca4 shared
Andreessen Horowitz3 shared
Endeavor3 shared
Paladin Capital Group3 shared
Brighteye Ventures3 shared
Osage University Partners3 shared
Canary3 shared
private angel investors3 shared
Pentech Ventures LLP2 shared
Visionaries2 shared
Index Ventures2 shared
Coatue Management LLC2 shared
CRV2 shared
Spark Capital2 shared
Sequoia Capital2 shared
Redpoint Ventures2 shared
HCVC2 shared
Last updated: 20 October 2026