# Leyden Labs funding: rounds and investors > Leyden Labs has raised $221M across 4 rounds since 2025. Investors include Polaris Partners, Qiming Venture Partners and European Investment Bank. Source: https://millionrounds.com/company/leyden-labs (Millionrounds; every figure on the page links to its filing or article) Netherlands · [Venture startup](https://millionrounds.com/companies) # Who invested in *Leyden Labs* 4 rounds we have observed, with the 11 investors named in them. Every figure came from a named source, and where the company reported a raise to the SEC itself, that is shown beside it. Biotech Healthcare Raised 5 months ago Funding summary Updated 26 Oct 2026 **$221M** raised across 4 rounds since 2025, from 4 sources **$70M** Round **$70M** Round **$35M** Venture **$45M** Venture - **Latest round:** Venture, $45M Jun 2026 - **Biggest round:** $70M Round · Apr 2025 - **Step-up i:** 1.3× - **Investors:** 11 (2 led) See who backed them ## The funding story Each circle is a round, placed by date and sized by amount. The line above is the running total. 2025 2026 **$70M** Round **$70M** Round **$35M** Venture **$45M** Venture - **First round:** Round, $70M - **Biggest round:** $70M - **Usual gap between rounds:** 6 months ## The rounds - **Jun 2026** Venture **$45M** *3 returning* [Qiming Venture Partners](https://millionrounds.com/fund/qiming-venture-partners) [Polaris Partners](https://millionrounds.com/fund/polaris-partners) [European Investment Bank](https://millionrounds.com/fund/european-investment-bank) Source recorded - **Oct 2025** Venture **$35M** *1 new* *2 returning* [Qiming Venture Partners](https://millionrounds.com/fund/qiming-venture-partners) [Polaris Partners](https://millionrounds.com/fund/polaris-partners) [European Investment Bank](https://millionrounds.com/fund/european-investment-bank) Source recorded - **Apr 2025** Round **$70M** No investor was named in the report. Reported by Silicon Canals - **Jan 2025** Round **$70M** *10 new* [Polaris Partners](https://millionrounds.com/fund/polaris-partners) Lead [ClavystBio](https://millionrounds.com/fund/clavystbio) Lead [Google Ventures](https://millionrounds.com/fund/gv) [Qiming Venture Partners](https://millionrounds.com/fund/qiming-venture-partners) [F-Prime Capital](https://millionrounds.com/fund/f-prime) [Invus](https://millionrounds.com/fund/invus) [Casdin Capital](https://millionrounds.com/fund/casdin-capital) [SoftBank Vision Fund 2](https://millionrounds.com/fund/softbank-vision-fund-2) [Bluebird Ventures](https://millionrounds.com/fund/bluebird-ventures) [Byers Capital / Brook Byers](https://millionrounds.com/fund/byers-capital-brook-byers) Reported by Silicon Canals ## Founders and team From Leyden Labs's own website: 4 founders, 11 on the team. **Koenraad Wiedhaup** Founder and Chief Executive Officer **Eli Casdin** Casdin Capital, Chief Investment Officer and Founder **Ronald Brus** Founder and Chief Growth Officer **Dinko Valerio** Founder and Chair of the Supervisory Board - **Ben Verwaayen** Alcatel-Lucent, former CEO - **Khoo Shih** ClavystBio, CEO - **Onno van de Stolpe** Galapagos, former CEO - **René Russo** Xilio Therapeutics, CEO - **Clarissa Koch** Chief Scientific Officer - **Jintanat Ananworanich** Chief Medical Officer - **Marieke van der Lans** Chief Financial Officer - **Susan Sobolov** Chief Technology Officer - **James Shannon** Novartis, former Global Head of Development - **Richard Whitley** Novartis, former Global Head of Development - **Xavier Maes** General Counsel Advisers *Jaap Goudsmit* ## Who was in which round The busiest backers across the latest rounds. A filled square is a round they joined; a dark one, a round they led. **Round** 2025 **Round** 2025 **Venture** 2025 **Venture** 2026 [Polaris Partners](https://millionrounds.com/fund/polaris-partners) L [Qiming Venture Partners](https://millionrounds.com/fund/qiming-venture-partners) [European Investment Bank](https://millionrounds.com/fund/european-investment-bank) [ClavystBio](https://millionrounds.com/fund/clavystbio) L [Google Ventures](https://millionrounds.com/fund/gv) [F-Prime Capital](https://millionrounds.com/fund/f-prime) [Invus](https://millionrounds.com/fund/invus) [Casdin Capital](https://millionrounds.com/fund/casdin-capital) [SoftBank Vision Fund 2](https://millionrounds.com/fund/softbank-vision-fund-2) [Bluebird Ventures](https://millionrounds.com/fund/bluebird-ventures) ## Everyone who backed them [Polaris Partners](https://millionrounds.com/fund/polaris-partners) VC firm **3** rounds, led 1 [Qiming Venture Partners](https://millionrounds.com/fund/qiming-venture-partners) VC firm **3** rounds [European Investment Bank](https://millionrounds.com/fund/european-investment-bank) Government **2** rounds [ClavystBio](https://millionrounds.com/fund/clavystbio) VC firm **1** round, led 1 [Google Ventures](https://millionrounds.com/fund/gv) Corporate VC **1** round [F-Prime Capital](https://millionrounds.com/fund/f-prime) VC firm **1** round [Invus](https://millionrounds.com/fund/invus) Private equity **1** round [Casdin Capital](https://millionrounds.com/fund/casdin-capital) VC firm **1** round [SoftBank Vision Fund 2](https://millionrounds.com/fund/softbank-vision-fund-2) Growth equity **1** round [Bluebird Ventures](https://millionrounds.com/fund/bluebird-ventures) VC firm **1** round [Byers Capital / Brook Byers](https://millionrounds.com/fund/byers-capital-brook-byers) Investment firm **1** round Missing a round, or an investor who was in one? [Tell us](https://millionrounds.com/corrections?slug=leyden-labs). ## Quick answers about Leyden Labs ### Who invested in Leyden Labs? Leyden Labs's investors include Polaris Partners, Qiming Venture Partners, European Investment Bank, ClavystBio and Google Ventures, and 6 more on record. ### How much has Leyden Labs raised? Leyden Labs has raised $221M across 4 rounds since 2025. ### When did Leyden Labs last raise? Leyden Labs's most recent round was a Venture of $45M in Jun 2026. ### What was Leyden Labs's biggest round? Leyden Labs's largest round on record is $70M (Undisclosed round), in Apr 2025. ### Who backed Leyden Labs first? Leyden Labs's first round on record, in Jan 2025, was backed by Polaris Partners, ClavystBio and Google Ventures and 7 others. ### What stage is Leyden Labs at? Leyden Labs's latest named round is a Venture, in Jun 2026. ### Where is Leyden Labs based? Leyden Labs is based in the Netherlands. ### Who led Leyden Labs's rounds? Polaris Partners led the funding round in 2025. ## Companies like Leyden Labs In the same sector, and raised in the last eighteen months. [**Cordys Analytics** $942K · Sept 2026](https://millionrounds.com/company/cordys-analytics)[**Phosphoenix** $1.8M · Sept 2026](https://millionrounds.com/company/phosphoenix)[**UCANACT** $923K · Sept 2026](https://millionrounds.com/company/ucanact)[**Whispp** $5.7M · Jul 2026](https://millionrounds.com/company/whispp)[**New Dawn Bio** $2.6M · Jun 2026](https://millionrounds.com/company/new-dawn-bio)[**The Protein Brewery** $59M · Jun 2026](https://millionrounds.com/company/the-protein-brewery) ## Find investors like these Search every investor by what they have actually funded, then narrow to your stage and market. Free. Open the investor searchOr these rounds in the app