Profile · founder · Fintech
Sebastian Siemiatkowski.
Co-founder and CEO of Klarna.
Typefounder
CategoryFintech
Based inStockholm
By Anish· Founder · Vedwix
·Story
Sebastian Siemiatkowski is the co-founder and CEO of Klarna. He co-founded Klarna in 2005 with Niklas Adalberth and Victor Jacobsson. The company's buy-now-pay-later model defined a category. By 2026, Klarna is post-IPO and Sebastian is a major figure in European fintech.
What they built
Klarna.
Notable facts
- Co-founder and CEO of Klarna
- Swedish
- IPO 2024
- Aggressive AI-driven cost cuts 2024
- 20+ years building Klarna
Design / brand lessons
Long founder tenure builds distinctive culture and brand.
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