Madrid founders can target active Spanish and pan-European seed, Series A, deep-tech, marketplace, enterprise, and growth investors whose regulated managers and current portfolios are publicly visible.
Market overview
Madrid's enterprise customer base, financial center, universities, and links to Latin America support a broad venture market spanning software, fintech, deep tech, health, and marketplaces.
How this investor list was built
Finta required every entry to pass the same inclusion gates: a current official mandate, current public evidence of an active organization or program, relevant stage or geography fit, and a usable public evidence trail. Entries that passed those gates appear alphabetically. The order is not a performance ranking, recommendation, or guarantee of availability.
This guide compares 10 currently relevant organizations. It was researched on September 2, 2026, after the original publication date shown above. Later evidence is presented as a research update, not as information that was necessarily available on the historical publication date.
Comparison table
| Organization | Why it is included | Public evidence | Public starting point |
|---|---|---|---|
| Acurio Ventures | European technology investor with a Madrid office and direct seed and Series A strategy. | Acurio Ventures official site, Acurio Ventures about | Open official starting point |
| Adara Ventures | Madrid deep-tech and enterprise investor in cybersecurity, data, infrastructure, and related B2B markets. | Adara Ventures official site | Open official starting point |
| Axon Partners Group | Madrid investment and advisory platform with technology venture and growth strategies. | Axon Partners Group official site | Open official starting point |
| Big Sur Ventures | Madrid early-stage investor for technology founders in Spain and Southern Europe. | Big Sur Ventures official site | Open official starting point |
| Bonsai Partners | Madrid technology investor for digital businesses with scalable economics. | Bonsai Partners official site | Open official starting point |
| JME Ventures | Madrid seed investor for Spanish technology companies. | JME Ventures official site | Open official starting point |
| K Fund | Madrid technology investor operating early-stage and specialist vehicles. | K Fund official site | Open official starting point |
| Kibo Ventures | Madrid early-stage technology investor for European founders building global companies. | Kibo Ventures official site | Open official starting point |
| Samaipata | Madrid early-stage investor for digital platforms and network-effect businesses in Europe. | Samaipata official site | Open official starting point |
| Seaya Ventures | Madrid venture investor for technology companies scaling across Europe and Latin America. | Seaya Ventures official site | Open official starting point |
Investor and capital-source profiles
Acurio Ventures
Mandate evidence: Acurio states that it invests primarily in European seed and Series A rounds and is sector agnostic.
Current activity evidence: The current portfolio and August 2026 journal updates show continuing investment activity.
Stage or geography evidence: The official site lists Madrid among its offices and a European mandate.
Sources reviewed September 2, 2026: Acurio Ventures official site, Acurio Ventures about.
Adara Ventures
Mandate evidence: Adara publishes a specialist deep-tech and B2B investment strategy.
Current activity evidence: The official site lists active funds, current portfolio, and investment news.
Stage or geography evidence: The firm lists Madrid and invests across Europe.
Sources reviewed September 2, 2026: Adara Ventures official site.
Axon Partners Group
Mandate evidence: Axon's official site describes its technology investment business and fund platform.
Current activity evidence: The live portfolio, funds, and news pages show active investment management.
Stage or geography evidence: The firm lists Madrid and international market coverage; founders must identify the appropriate fund.
Sources reviewed September 2, 2026: Axon Partners Group official site.
Big Sur Ventures
Mandate evidence: Big Sur's official site describes its seed-stage technology mandate.
Current activity evidence: Its current portfolio, funds, and team pages remain active.
Stage or geography evidence: The firm identifies Madrid and a Southern European focus.
Sources reviewed September 2, 2026: Big Sur Ventures official site.
Bonsai Partners
Mandate evidence: Bonsai's official site presents its technology and internet investment thesis.
Current activity evidence: The current portfolio and team pages identify active companies and partners.
Stage or geography evidence: The firm lists Madrid and a European investment context.
Sources reviewed September 2, 2026: Bonsai Partners official site.
JME Ventures
Mandate evidence: JME's official site defines its early-stage technology investment strategy.
Current activity evidence: The live portfolio and team pages identify current investments.
Stage or geography evidence: The firm is registered and based in Madrid and focuses on Spanish founders.
Sources reviewed September 2, 2026: JME Ventures official site.
K Fund
Mandate evidence: K Fund's official site presents its technology investment platform and fund-specific theses.
Current activity evidence: Current funds, portfolio companies, and published investment updates are live.
Stage or geography evidence: The platform lists Madrid and invests across Southern Europe and selected global markets.
Sources reviewed September 2, 2026: K Fund official site.
Kibo Ventures
Mandate evidence: Kibo's official site defines its technology venture strategy and founder support.
Current activity evidence: The current fund, portfolio, and news pages show active deployment.
Stage or geography evidence: The firm lists Madrid and focuses on seed and Series A technology companies in Europe.
Sources reviewed September 2, 2026: Kibo Ventures official site.
Samaipata
Mandate evidence: Samaipata publishes a specialist digital-platform and marketplace thesis.
Current activity evidence: Its current portfolio and insights show active company support.
Stage or geography evidence: The firm lists Madrid and invests across Europe at early stage.
Sources reviewed September 2, 2026: Samaipata official site.
Seaya Ventures
Mandate evidence: Seaya's official site describes venture and growth strategies for technology and impact companies.
Current activity evidence: The live funds, portfolio, and news pages identify active investments.
Stage or geography evidence: The firm lists Madrid and a European and Latin American market focus.
Sources reviewed September 2, 2026: Seaya Ventures official site.
How founders can use this list
- Match the company to a named fund because several Madrid managers run multiple strategies.
- Show why the company can scale across Spain, Europe, or Latin America where the mandate is cross-border.
- Use specialist deep-tech investors only when the technical evidence matches the published thesis.
Limits and disclosures
- Madrid location does not imply Spain-only investing.
- Regulated manager listings establish legal presence, not current startup fit by themselves.
- Public sites often omit lead behavior and reserve policy.
- Public mandates, application paths, and disclosed terms can change. Reverify every organization before outreach.
- Finta does not provide investment, legal, tax, medical, regulatory, procurement, or export-control advice.
Related investor research
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- Top London VC Firms and Angel Investors (2026)
Turn research into a reviewed fundraising workflow
Use Finta's fundraising workflow to move from investor research to relationship-aware outreach, meeting preparation, and accountable follow-up. A person remains responsible for fit, messaging, introductions, and every external action.