Sebastian Siemiatkowski is an angel investor and operator angel based in Stockholm, Sweden. The known portfolio counts 10 companies: Lovable, Nylas, Budbee, Depop, Talentium, Omio, Prion, Steven, nexos.ai and Scrive.
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Investment focus
Contacts
Sebastian Siemiatkowski portfolio companies (10)
- Lovable
- Nylas
- Budbee
- Depop
- Talentium
- Omio
- Prion
- Steven
- nexos.ai
- Scrive
Affiliated funds' portfolios
Co-Founder at Klarna, whose known portfolio counts 8 companies
- Bunch
- Embat
- Billie
- Bits Technology
- Wrapp
- Violet
- Borgo
- InterEarth
Investor Profile
The known portfolio sits in sector SaaS, and focus areas Developer Tools, Email and Enterprise SaaS.
Stage-wise, the known deals cluster around Seed rounds.
The portfolio and focus above give founders context on whether Sebastian Siemiatkowski matches their raise.
Colleagues at Klarna
Markus Villig
Board Member
Estonia
Joel Palathinkal
Investor - Exited
New York, United States
Robbert Visser
Group Lead
Cluj-Napoca, Romania
Jane W.
Investor
Stockholm, Sweden
Federico Renzi
Investor
Sweden
Adam S. Lasri
Investor
Paris, France
Johan Brenner
Investor
Stockholm, Sweden
Javier Santiso
Deal Originator and Investor
Madrid, Spain
Andrea Hunter
Investor
Columbus, United States
Beth Kiefer
Investor
London, United Kingdom
Victor J.
Co-Founder and Owner
Stockholm, Sweden
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Frequently asked questions
Who is Sebastian Siemiatkowski?
Sebastian Siemiatkowski is an angel investor and operator angel based in Stockholm, Sweden with 10 known investments on file, among them Lovable, Nylas and Budbee. The sections above list the sectors, stages and firms attached to that record.
What does Sebastian Siemiatkowski invest in?
Listed sectors include SaaS; listed focus areas include Developer Tools, Email and Enterprise SaaS. 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 Sebastian Siemiatkowski invest at?
The known deals of Sebastian Siemiatkowski include 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.
Which firm is Sebastian Siemiatkowski listed at?
Sebastian Siemiatkowski is listed as Co-Founder at Klarna. 11 other people in the database share a firm with Sebastian Siemiatkowski.
How do I contact Sebastian Siemiatkowski?
An email address and a LinkedIn page are on file for Sebastian Siemiatkowski. The address stays masked on this page and is readable inside RaiseHunt after you create an account. The database holds no phone number for this profile.
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Data: RaiseHunt investor dataset · Snapshot 5 September 2026 · How this data is built · Report a correction or request removal