Martin Sieber is an angel investor and operator angel based in Berlin, Germany. The known portfolio counts 3 companies: Arbio, Insightness and LocalUncle.
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Investment focus
- Stage
- Pre-Seed
- Focus
- MarketplacesOnline MarketplacePayment ProcessingReviews and RecommendationsTours & ActivitiesUser Interface Design
Contacts
Martin Sieber portfolio companies (3)
- Arbio
- Insightness
- LocalUncle
Investor Profile
The listing covers sectors Commerce, Consumer, SaaS and Travel, and focus areas Marketplaces, Online Marketplace, Payment Processing and Reviews and Recommendations. Startups operating in these areas may find Martin Sieber relevant.
Stage-wise, the known deals cluster around Pre-Seed rounds.
Reviewing the investment history helps decide whether there is a realistic fit before reaching out.
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Frequently asked questions
Who is Martin Sieber?
Martin Sieber is an angel investor and operator angel based in Berlin, Germany with 3 known investments on file, among them Arbio, Insightness and LocalUncle. The sections above list the sectors and stages attached to that record.
What does Martin Sieber invest in?
Listed sectors include Commerce, Consumer, SaaS and Travel; listed focus areas include Marketplaces, Online Marketplace, Payment Processing and Reviews and Recommendations. Those tags come from the companies attached to this profile, so they read as a record of what has been backed rather than a stated preference for what comes next.
What stage does Martin Sieber invest at?
The known deals of Martin Sieber include Pre-Seed rounds. Stage is the strongest single filter when you build a target list: an investor with no record at your stage rarely starts with you.
How do I contact Martin Sieber?
An email address, a phone number and a LinkedIn page are on file for Martin Sieber. The address stays masked on this page and is readable inside RaiseHunt after you create an account.
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Data: RaiseHunt investor dataset · Snapshot 5 September 2026 · How this data is built · Report a correction or request removal