Jaan Tallinn
About Jaan Tallinn
Jaan Tallinn is based in Tallinn, Estonia. He holds a BSc in theoretical physics from the University of Tartu. He is best known as a founding engineer of Skype and Kazaa, the peer-to-peer file-sharing application.
He co-founded the Centre for the Study of Existential Risk at the University of Cambridge, with Huw Price and Martin Rees, and the Future of Life Institute. He is a partner at Ambient Sound Investments (asi.ee). He has also served on the European Commission's High-Level Expert Group on AI and the Estonian President's Academic Advisory Board, and was appointed to the UN High-level Advisory Body on AI.
He also funds AI safety work philanthropically. The Survival and Flourishing Fund, founded in 2019, is funded by him. TIME named him to its 2026 Philanthropy list.
CSER and other bios describe him as an active angel investor. PitchBook lists him as an angel investor with 86 investments, and Crunchbase lists 44 portfolio companies. The two databases count differently, so treat both figures as approximate.
Besides the AI companies below, public sources name Faculty, a British AI company, and Pactum, an autonomous negotiation startup based in California and Estonia. PitchBook also lists him as co-founder of Encultured AI and as an advisor to Karma Ventures.
In 2011 he joined DeepMind's Series A and sat on its board. Other investors in that round included Elon Musk and Founders Fund. Google later acquired the company.
In 2021 he led Anthropic's $124M Series A. He has said he invests in AI labs because he fears the technology, and that he sees his money as displacing venture capital rather than creating the company. He has described Anthropic as safety-focused but also as proliferation. In a Generalist interview he said he asked Dario Amodei to collect competing term sheets before he accepted his own investment.
His public record is concentrated in AI, from early rounds to a lead Series A. He has repeatedly framed his AI work around safety and long-term risk. Founders should expect questions on safety practices and governance.
He has not published a standard check size, and no fund size is public. His investments run through Ambient Sound Investments and personal capital. Estonia and the UK appear in his portfolio, but no geographic mandate is stated.
- Anthropic: AI safety-focused lab; he led the $124M Series A in 2021.
- DeepMind: AI research company; Series A investor and board member in 2011, later acquired by Google.
- Faculty: British AI company; year not confirmed.
- Pactum: autonomous negotiation startup in California and Estonia; year not confirmed.
- Encultured AI: listed by PitchBook as a company he co-founded.
Investing activity
Jaan Tallinn appears in 1 AI deal tracked by the AI Lounge deals desk, rounds totalling $124M, and led 1 of them. The rounds are mostly Series A, with a median round size of $124M. The most recent is Anthropic (Series A, $124M, May 2021).
Jaan Tallinn most often invests alongside Dustin Moskovitz and Eric Schmidt, and the companies they back on AI Lounge are mostly in AI.
Deals
Frequently asked questions about Jaan Tallinn
Does Jaan Tallinn invest in AI startups?
Yes. He was an early investor in DeepMind and led Anthropic's $124M Series A in 2021. He also backed Faculty and Pactum.
What does Jaan Tallinn look for in AI founders?
He has not published a checklist. His public statements and giving center on AI safety, so founders should be ready to discuss risk and governance.
What is Jaan Tallinn's check size?
It is not public. Databases list deal counts but not reliable check sizes, so we do not state one.
How is Jaan Tallinn connected to Ambient Sound Investments?
Bios list him as a partner at Ambient Sound Investments (asi.ee). PitchBook says he works on its overall strategy and reviews potential portfolio companies.
What is Jaan Tallinn known for outside investing?
He was a founding engineer of Skype and Kazaa. He co-founded the Centre for the Study of Existential Risk and the Future of Life Institute, and he funds AI safety research.
Where is Jaan Tallinn based?
He is based in Tallinn, Estonia.
Is Jaan Tallinn an angel investor?
Yes. Jaan Tallinn invests personally as an angel.
What AI companies has Jaan Tallinn invested in?
Jaan Tallinn's AI investments include Anthropic. The 1 round on AI Lounge are listed on this page with amounts, dates and co-investors.
What stage does Jaan Tallinn invest at?
In the rounds tracked on AI Lounge, Jaan Tallinn has invested at Series A, with a median round of $124M. Jaan Tallinn led 1 of those rounds.
Who does Jaan Tallinn co-invest with?
Jaan Tallinn's most frequent co-investors on AI Lounge are Dustin Moskovitz (1 deal) and Eric Schmidt (1 deal).