Sebastian Siemiatkowski
Swedish co-founder and CEO of Klarna
- Age
- 45 yrs
- Birthday in 332 days
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Sebastian Siemiatkowski is a Swedish entrepreneur who co-founded the payments company Klarna in 2005 and leads it as CEO. Klarna popularised “buy now, pay later” online shopping and listed on the New York Stock Exchange in September 2025.
Biography
Background
Siemiatkowski was born in Stockholm to Polish immigrant parents. He studied at the Stockholm School of Economics.
Klarna
In 2005 he, Niklas Adalberth and Victor Jacobsson pitched an idea for paying after delivery at a business competition. Klarna grew across Europe and then into the US.
Ups and downs
Klarna was valued at $45.6 billion in 2021 but at $6.7 billion in a 2022 funding round as interest rates rose.
AI and IPO
He became known for claiming AI could replace much of Klarna’s customer service and staff. Klarna listed on the NYSE in 2025.
Timeline
-
1981
Born in Stockholm, Sweden
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2005
Co-founds Klarna
-
2010
Sequoia invests
-
2021
Valued at $45.6 billion
-
2022
Valuation falls to $6.7 billion
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2025
NYSE listing
Did you know?
-
1
Klarna’s founders were initially laughed at in the business competition.
-
2
His parents came from Poland.
-
3
Klarna has more than 100 million users.
Connections
Related people
Frequently asked
Who is Sebastian Siemiatkowski?
Sebastian Siemiatkowski is a Swedish entrepreneur who co-founded the payments company Klarna in 2005 and leads it as CEO. Klarna popularised “buy now, pay later” online shopping and listed on the New York Stock Exchange in September 2025.
How old is Sebastian Siemiatkowski?
Sebastian Siemiatkowski is 45 years old, born on 3 October 1981 in Stockholm, Sweden.
Where is Sebastian Siemiatkowski from?
Sebastian Siemiatkowski was born in Stockholm, Sweden.
What is Sebastian Siemiatkowski known for?
Sebastian Siemiatkowski is best known for Co-founding Klarna (2005); buy-now-pay-later; Klarna’s 2025 stock-market listing.
References
- Sebastian Siemiatkowski — Wikipedia. Wikipedia. Retrieved 4 November 2026.
- Sebastian Siemiatkowski (Q7442526) — structured data. Wikidata. Retrieved 4 November 2026.
Includes material from the Wikipedia article “Sebastian Siemiatkowski”, licensed under CC BY-SA 4.0. That text is available under the same licence. Learn more
External links
About this profile
- Researched by the TrackFame editorial team; reviewed by Sanjay Sokal under our editorial policy
- First published 4 November 2026
- Last updated
Cite this page
“Sebastian Siemiatkowski.” TrackFame, last updated 4 November 2026. https://trackfame.com/person/sebastian-siemiatkowski
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