Niklas Zennström
About Niklas Zennström
Niklas Zennström is a Swedish entrepreneur and investor, born in 1966 and educated at Uppsala University. With Janus Friis he co-founded the file-sharing service Kazaa and the internet calling service Skype. He was Skype's CEO until March 2008. He also co-founded and managed Joltid.
He launched Atomico in 2006 and is its founder, CEO and founding partner. The firm is based in London and has offices in Paris, Berlin and Stockholm. In 2007 he and his wife Catherine co-founded Zennström Philanthropies, which focuses on human rights and the environment. He also founded the Baltic Sea foundation Race for the Baltic.
Most of Zennström's public investing record runs through Atomico, not personal angel cheques. Atomico says it has invested in more than 200 companies across four continents. Crunchbase lists him on the boards of Farmdrop, Lilium, Pipedrive, Oden Technologies and Varjo. That list may be out of date.
We found no public list of his personal angel investments, with dates or amounts. Those details are left out here.
On the Lounge deals desk, Zennström appears in QuTwo's €25M pre-seed round, listed as 2026-06. Press coverage dates the announcement to early May 2026. QuTwo is a Helsinki-based AI lab founded by Peter Sarlin, who previously ran Silo AI. AMD acquired Silo AI in 2024. QuTwo's product, QuTwo OS, is an orchestration layer that routes AI workloads across classical, quantum-inspired and quantum hardware.
The round was described as an angel round and as QuTwo's first external funding. Other named participants include Yuri Milner, Xavier Niel, Nico Rosberg and Dieter Schwarz, plus founders of Hugging Face, Supercell and Wolt. Reports give the valuation as €325M, or roughly $380M. Zennström's individual cheque size was not disclosed.
Zennström's personal angel focus and check size are not public. Atomico, the firm he leads, invests from seed to late stage, mainly in European founders. It also backs companies in the US. Its sixth fund, raised in 2024, totals $1.24B. It is split between a $754M growth fund and a $485M early-stage fund. A third-party tracker shows AI and machine learning as the most common category in Atomico's tracked investments. These are firm-level figures, not his own angel terms.
- QuTwo: Helsinki AI lab building an orchestration layer for classical and quantum compute; Zennström joined its €25M pre-seed angel round in 2026.
- Atomico portfolio (firm-level, not personal angel): Klarna, Supercell, Stripe and DeepL are named among the firm's investments.
- Board seats listed on Crunchbase: Farmdrop, Lilium, Pipedrive, Oden Technologies and Varjo.
- londontechweek.com/speakers/niklas-zennstrom
- en.wikipedia.org/wiki/Niklas_Zennstr%C3%B6m
- en.wikipedia.org/wiki/Atomico
- hrw.org/about/people/niklas-zennstrom
- crunchbase.com/person/niklas-zennstrom
- quantumcomputingreport.com/qutwo-raises-e25m-29-4m-usd-angel-round-to-
- thesaasnews.com/news/qutwo-raises-25m-pre-seed
- dealroom.co/news/131094-qutwo-raises-25m-angel-round-at-380m-valuation
Investing activity
Niklas Zennström appears in 1 AI deal tracked by the Lounge deals desk, rounds totalling $28M. The rounds are mostly Pre-seed, with a median round size of $28M. The most recent is QuTwo (Pre-seed, €25M, Jun 2026).
Niklas Zennström most often invests alongside Yuri Milner, Nico Rosberg, Dieter Schwarz and Xavier Niel, and the companies they back on Lounge are mostly in AI.
Deals
Frequently asked questions about Niklas Zennström
Does Niklas Zennström invest in AI startups?
Yes. He took part in QuTwo's €25M pre-seed angel round in 2026, an AI lab founded by Peter Sarlin. Atomico, the firm he leads, also backs AI and machine learning companies.
What is Niklas Zennström's angel check size?
His personal check size is not public. The QuTwo reports name him as a participant without giving his amount.
What stage does Niklas Zennström invest in?
His QuTwo investment was at pre-seed. Atomico, which he founded and leads, invests from seed through late stage.
Who else invested in the QuTwo round alongside Niklas Zennström?
Reported participants include Yuri Milner, Xavier Niel, Nico Rosberg and Dieter Schwarz. Founders from Hugging Face, Supercell, Wolt, Miro and Legora also took part.
Is Niklas Zennström the same person as the Atomico founder and Skype co-founder?
Yes. The Niklas Zennström on this page co-founded Skype and Kazaa and founded Atomico, where he is CEO.
How can founders contact Niklas Zennström?
He lists LinkedIn and an X account (@nzennstrom) that links to atomico.com. We found no personal website or public pitch process.
Is Niklas Zennström an angel investor?
Yes. Niklas Zennström invests personally as an angel.
What AI companies has Niklas Zennström invested in?
Niklas Zennström's AI investments include QuTwo. The 1 round on Lounge are listed on this page with amounts, dates and co-investors.
What stage does Niklas Zennström invest at?
In the rounds tracked on Lounge, Niklas Zennström has invested at Pre-seed, with a median round of $28M.
Who does Niklas Zennström co-invest with?
Niklas Zennström's most frequent co-investors on Lounge are Yuri Milner (1 deal), Nico Rosberg (1 deal), Dieter Schwarz (1 deal) and Xavier Niel (1 deal).