Sami Marttinen
Angel investor in Helsinki
Helsinki, Uusimaa
Sami Marttinen, Angel investor in Helsinki is an active investor based in Helsinki, Uusimaa. This profile covers what Sami Marttinen backs, at which stage, and how founders can reach out in 2026.
Mr. Sami Marttinen is a Co-Founder and serves as Co-Chief Executive Officer, Managing Director and Board Member at Swappie.
- Investor type
- Angel
- Stages
- Early Stage Venture
- Invests in
- Consumer & RetailE-commerce & D2CClimate & EnergyHardware & Deep TechManufacturing & IndustrialMarketing & AdTech
- Location
- Helsinki, Uusimaa
- Typical check
- $500K
- Past investments
- 1
Notable investments
BoughtHow to reach Sami Marttinen
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About this profile
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Cite this page
Round Funded. "Sami Marttinen." Round Funded investor database, updated September 8, 2026.
Stable URL, it will not change: https://www.roundfunded.com/en/investor/sami-marttinen
Frequently Asked Questions
What does Sami Marttinen invest in?
Sami Marttinen invests in Consumer & Retail, E-commerce & D2C, Climate & Energy and Hardware & Deep Tech, typically at Early Stage Venture. Match your sector and stage, then reach out with a personalized pitch.
What stage does Sami Marttinen invest at?
Sami Marttinen typically invests at Early Stage Venture. Lead with traction that fits the stage when you reach out.
What is Sami Marttinen's typical check size?
Sami Marttinen typically writes checks around $500K. Use it as a signal for whether your raise fits their stage.
How do founders reach investors like this?
Round Funded lists active investors with verified, professional contact details for signed-up founders. Filter by sector, stage and location, then send a personalized pitch from your own inbox.
What is Round Funded?
Round Funded is an investor database and outreach platform for startup founders. It lists 60,000+ active investors with verified contacts, filtered to recent investment activity, and lets founders send personalized pitches from their own Gmail, track replies, and share a free Data Room. Round+ starts at $99 per month with a 3-day trial.