Franck Le Ouay
About Franck Le Ouay
Franck Le Ouay is a French engineer and entrepreneur. He graduated from Mines ParisTech and began his career in software development at Microsoft in the United States. He then co-founded Criteo in Paris, where Crunchbase lists him as Chief Scientist and co-founder from October 2004 to October 2014. Criteo has been listed on Nasdaq since 2013.
In 2015 he co-founded Lifen, a health technology company, and he is its CEO. Dealroom also lists him as a co-founder of Karos, a mobility company.
Public databases record roughly 6 to 11 angel investments, depending on the source. The earliest are Alkemics and GoBeep in 2015 (PitchBook). In 2017 and 2018 he joined early rounds in Inato, Memo Bank, Karos, Riminder and Sancare (NFX Signal). He is also listed as a co-investor in the 2019 Pixpay seed round (CB Insights).
He often invests alongside other Criteo founders and French angels, including Jean-Baptiste Rudelle, Romain Niccoli and Xavier Niel (NFX Signal).
HrFlow.ai is the AI round on the Lounge deals desk: a $7M round dated April 2026, listed on Lounge as Seed. The company's press release calls it a pre-Series A and its second fundraising round. HrFlow.ai applies AI to HR data. EU-Startups lists him among the company's existing investors in that round, which was led by 115K and EmergingTech Ventures.
PitchBook also lists an HrFlow.ai investment dated May 2018. NFX Signal records a $2M seed round for Riminder in the same month, with him as an investor.
Most of his recorded deals are at seed or Series A, mainly in France. Sectors include HR tech, healthtech, fintech and mobility. StartupHub lists his focus as enterprise applications, consumer, healthtech and adtech.
NFX Signal lists his investment range as $5K to $50K, with a sweet spot of $25K. This comes from a third-party profile, not from a statement by him. We found no public statement from him on what he looks for in founders.
- HrFlow.ai: AI for HR data; $7M round in April 2026, and an earlier investment dated May 2018 in PitchBook
- Riminder: $2M seed in May 2018 (NFX Signal)
- Memo Bank: French bank for SMEs; seed in March 2018 (NFX Signal)
- Karos: carpooling; Series A in April 2018 (NFX Signal)
- Inato: clinical trial platform; seed in November 2017 (NFX Signal)
- Sancare: healthcare software; investment in late 2018 (NFX Signal)
- Pixpay: seed round in May 2019 (CB Insights)
- Alkemics: early-stage round in March 2015 (PitchBook)
- signal.nfx.com/investors/franck-le-ouay
- crunchbase.com/person/franck-le-ouay
- lifen.health/en/about/c-suite
- stm.cairn.info/publications-de-franck-le-ouay--810095?lang=en
- pitchbook.com/profiles/investor/149971-33
- startuphub.ai/investors/franck-le-ouay
- app.dealroom.co/investors/franck_le_ouay
- cbinsights.com/investor/martial-valery
Investing activity
Franck Le Ouay appears in 1 AI deal tracked by the Lounge deals desk. The rounds are mostly Seed, with a median round size of $7M. The most recent is HrFlow.ai (Seed, $7M, Apr 2026).
Franck Le Ouay most often invests alongside EmergingTech Ventures, 115K, Sophie Serratrice and Jean-Baptiste Rudelle, and the companies they back on Lounge are mostly in AI.
Deals
Frequently asked questions about Franck Le Ouay
Who is Franck Le Ouay?
He is a French engineer and entrepreneur. He co-founded Criteo, co-founded Lifen in 2015 and is its CEO. He also invests as an angel.
What is Franck Le Ouay's typical angel check size?
NFX Signal lists a range of $5K to $50K with a $25K sweet spot. He has not published a check size himself, as far as we found.
Has Franck Le Ouay invested in AI startups?
Yes. He is an investor in HrFlow.ai, which raised a $7M round in April 2026. NFX Signal also lists a 2018 seed investment in Riminder.
What stage does Franck Le Ouay invest in?
His recorded deals are mostly seed and Series A, with some later rounds in companies he backed earlier, such as HrFlow.ai in 2026.
Does Franck Le Ouay invest outside France?
Most of his recorded investments are in French companies. StartupHub lists France as his focus. We found no public statement on a geographic limit.
Which investors does Franck Le Ouay co-invest with?
NFX Signal lists Xavier Niel (Kima Ventures), Jean-Baptiste Rudelle and Romain Niccoli as co-investors in several of his deals.
Is Franck Le Ouay an angel investor?
Yes. Franck Le Ouay invests personally as an angel.
What AI companies has Franck Le Ouay invested in?
Franck Le Ouay's AI investments include HrFlow.ai. The 1 round on Lounge are listed on this page with amounts, dates and co-investors.
What stage does Franck Le Ouay invest at?
In the rounds tracked on Lounge, Franck Le Ouay has invested at Seed, with a median round of $7M.
Who does Franck Le Ouay co-invest with?
Franck Le Ouay's most frequent co-investors on Lounge are EmergingTech Ventures (1 deal), 115K (1 deal), Sophie Serratrice (1 deal), Jean-Baptiste Rudelle (1 deal) and Domnin de Kerdaniel (1 deal).