Thomas Zaepffel
About Thomas Zaepffel
Thomas Zaepffel is based in Paris. He studied applied mathematics at Ecole Polytechnique and finance at HEC Paris. According to TheOrg, he worked as an M&A analyst at Deutsche Bank before moving into entrepreneurship.
He co-founded Adot, a data-driven mobile programmatic advertising platform, and worked there from 2014 to 2021. In 2021 he co-founded Immortal Game, a chess game company, and serves as its CEO. Tracxn reports that Immortal Game has raised $15.5M. He also co-founded Kerria AM, a Paris real estate asset manager, with Geoffroy Mestrallet. It later became part of the Joconde group.
He is currently CEO and co-founder of Coliseum, a competitive gaming platform. In a Cryptonews author bio he is described as writing on gaming, blockchain and AI.
Crunchbase lists Zaepffel as a seed investor in Audion (from 2018) and While (from September 2024). Those entries give no round sizes or terms. His most recent publicly reported angel round is Concord's seed in June 2026. Public sources do not list his personal check sizes or total number of investments.
Zaepffel took part in Concord's $3M seed round, announced on 23 June 2026. Concord builds an agentic platform that turns campaign briefs into live media campaigns across buying platforms. Press coverage names him as an angel alongside Rémi Lemonnier, Philippe Corrot and Arthur Querou. A16Z Scout, Drysdale, Motier Ventures and Better Angle also invested. ExchangeWire identifies him as Thomas Zaepffel of Adot. Concord's CTO and head of engineering previously built Adot's ad tech platform.
Crunchbase also lists him as a late stage investor in OpenAI since March 2024. That entry comes from Crunchbase and we could not confirm it from a second source.
The public record shows seed-stage angel investments in ad tech and AI, plus a gaming connection through Coliseum. Coliseum announced a $2M fund in December 2024 for Web3 gaming projects, with checks of $50,000 to $250,000. That is a Coliseum fund, not Zaepffel's personal angel check size. He has not publicly stated his personal check size or investment criteria in the sources we found.
- Concord: agentic media buying platform based in Paris and New York, invested in its $3M seed round, June 2026
- Audion: listed on Crunchbase as a seed investment since 2018
- While: listed on Crunchbase as a seed investment since September 2024
- OpenAI: listed on Crunchbase as a late stage investment since March 2024, not confirmed by a second source
- crunchbase.com/person/thomas-zaepffel
- linkedin.com/in/thomas-zaepffel-7a794049
- theorg.com/org/immortal-game/org-chart/thomas-zaepffel
- exchangewire.com/blog/2026/06/23/concord-raises-3m-to-build-agentic-ex
- pulse2.com/concord-raises-3-million-seed-funding-to-build-agentic-medi
- finsmes.com/2026/06/concord-raises-3m-in-seed-funding.html
- globenewswire.com/news-release/2024/12/17/2998424/0/en/Coliseum-Launch
- tracxn.com/d/companies/immortal-game/__R2DRe_T2zGyGlw2WnJ4Ht2tnK7qFvOB
Investing activity
Thomas Zaepffel appears in 1 AI deal tracked by the Lounge deals desk. The rounds are mostly Seed, with a median round size of $3M. The most recent is Concord (Seed, $3M, Jun 2026).
Thomas Zaepffel most often invests alongside Motier Ventures, Drysdale Ventures, a16z Scout Fund and Better Angle, and the companies they back on Lounge are mostly in AI.
Deals
Frequently asked questions about Thomas Zaepffel
Who is Thomas Zaepffel?
Thomas Zaepffel is a Paris-based entrepreneur and angel investor. He co-founded the ad tech company Adot, is CEO of Coliseum and Immortal Game, and co-founded the real estate asset manager Kerria AM.
Has Thomas Zaepffel invested in AI startups?
Yes. He was an angel in Concord's $3M seed round in June 2026. Concord builds an agentic AI platform for media buying.
What check size does Thomas Zaepffel write?
His personal check size is not public. Coliseum's $2M Web3 gaming fund, announced in December 2024, lists checks of $50,000 to $250,000. That is a separate vehicle.
What stage does Thomas Zaepffel invest in?
The rounds we could confirm are seed stage, including Concord's seed. Crunchbase also lists a late stage OpenAI investment, which we could not verify elsewhere.
Does Thomas Zaepffel know ad tech and media buying?
Yes. He co-founded Adot, a programmatic advertising platform, and ran it from 2014 to 2021. Concord's engineering leads previously built Adot's ad tech platform.
Where is Thomas Zaepffel based?
He is based in Paris, France, according to Crunchbase and LinkedIn.
Is Thomas Zaepffel an angel investor?
Yes. Thomas Zaepffel invests personally as an angel.
What AI companies has Thomas Zaepffel invested in?
Thomas Zaepffel's AI investments include Concord. The 1 round on Lounge are listed on this page with amounts, dates and co-investors.
What stage does Thomas Zaepffel invest at?
In the rounds tracked on Lounge, Thomas Zaepffel has invested at Seed, with a median round of $3M.
Who does Thomas Zaepffel co-invest with?
Thomas Zaepffel's most frequent co-investors on Lounge are Motier Ventures (1 deal), Drysdale Ventures (1 deal), a16z Scout Fund (1 deal), Better Angle (1 deal) and Philippe Corrot (1 deal).