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Mike Chalfen

Investor

Former Partner at Mosaic Ventures

London

Writes $100K – $5M checks · typically $1.5M

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You →Jamie · 6 people · together at Mosaic Ventures →Mike

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About

Mike Chalfen is a solo venture capital investor operating under Chalfen Ventures, focusing on software-driven companies where he typically invests larger checks in a small number of firms from early stages. His investment portfolio includes early-stage positions in companies such as King.com, Illumio, Houzz, Snyk, Crossbeam, and Tray.io, among others. Chalfen was ranked number six on Forbes' first Midas List Europe.

Experience

  1. Chalfen VenturesPartnercurrent2018 — presentGreater London
  2. IridiusInvestorcurrent2026 — present
  3. SurrealDBInvestorcurrent2025 — present
  4. TracelightInvestorcurrent2025 — present
  5. Polar AnalyticsInvestorcurrent2024 — present
  6. CognaInvestorcurrent2024 — present
  7. DeblockInvestorcurrent2024 — present
  8. StackfixInvestorcurrent2024 — present
  9. UpcitiInvestorcurrent2023 — presentGreater Paris Metropolitan Region
  10. TranslucentInvestorcurrent2023 — present
  11. Worldover ioInvestorcurrent2022 — presentLondon Area, United Kingdom
  12. 5Mins.aiInvestorcurrent2022 — presentLondon, England, United Kingdom
  13. LuminovoInvestorcurrent2022 — presentMunich, Bavaria, Germany
  14. OpplyInvestorcurrent2021 — presentLondon, England, United Kingdom
  15. AmenitizInvestorcurrent2022 — presentBarcelona, Catalonia, Spain
  16. CrossbeamInvestorcurrent2021 — presentParis, Île-de-France, France
  17. FlexcitonInvestorcurrent2021 — presentLondon, England, United Kingdom
  18. General IndexInvestorcurrent2021 — presentLondon, England, United Kingdom
  19. Lokalise — NOW hiring REMOTELYInvestorcurrent2020 — present
  20. Bridebook - The No.1 Wedding Planning AppInvestorcurrent2020 — present
  21. SEDNAInvestorcurrent2020 — presentLondon, England, United Kingdom
  22. BRYTERInvestorcurrent2019 — presentBerlin, Germany
  23. Time is Ltd.Investorcurrent2019 — presentPrague
  24. SnykInvestorcurrent2018 — present
  25. Harbr | Data. Enabled.Investorcurrent2018 — presentLondon, United Kingdom
  26. Oden TechnologiesInvestorcurrent2018 — presentNew York
  27. tray.ioInvestorcurrent2016 — presentLondon, United Kingdom
  28. IllumioFirst Investorcurrent2013 — presentSanta Clara, California
  29. HouzzInvestorcurrent2010 — present
  30. Vault PlatformInvestor2018 — 2025London, United Kingdom
  31. AtomicJar, Inc.Investor2021 — 2023Distributed
  32. MoogsoftInvestor2012 — 2023
  33. Advent Venture PartnersGeneral Partner2008 — 2020
  34. Seal SoftwareBoard member and investor2010 — 2020Sunnyvale, CA
  35. Mosaic VenturesCo-founder and Partner2014 — 2018London, United Kingdom
  36. UbiquisysNED2011 — 2013Swindon, United Kingdom
  37. FizzbackNED and angel investor2008 — 2011
  38. The FoundryNED2009 — 2011
  39. King.comLead investor and NED2005 — 2006London, United Kingdom and Stockholm, Sweden
  40. Tideway SystemsNon-Executive Director2004 — 2006

Skills & more

Early-stage StartupsInvestments

Languages English · French · Spanish

From Mike's professional profile.

Investments

Investor

5MinsAmenitizAtomicjarCrate.ioCrateDBCrossbeamFlexcitonGeneral IndexHouzzInfoSumInherentIridiusKing.comLevityLokaliseLuminovoOpplyPolar AnalyticsSnykStackfixSurrealDBTime is Ltd.TracelightTranslucenttray.ioVault PlatformWorldStores

Per curated public sources.

Network6

Danny RimerScout
Partner at Index Ventures
Bart DessaintScout
Venture Partner at Mosaic Ventures
Ben StevenScout
Principal at Momenta Ventures
Chandar LalScout
Partner at Mosaic Ventures
Chris HemmeterScout
Investor at Thayer Ventures
Christian MeermannScout
Founding Partner at Cherry Ventures

Investors connected to Mike in public investor directories — a warm-intro map.

Frequently asked questions

Who is Mike Chalfen?
Mike Chalfen is a solo venture capital investor operating under Chalfen Ventures, focusing on software-driven companies where he typically invests larger checks in a small number of firms from early stages. His investment portfolio includes early-stage positions in companies such as King.com, Illumio, Houzz, Snyk, Crossbeam, and Tray.io, among others. Chalfen was ranked number six on Forbes' first Midas List Europe.
What check size does Mike Chalfen write?
Mike Chalfen typically writes checks of $100K – $5M.
What companies has Mike Chalfen invested in?
Investments tracked here include 5Mins, Amenitiz, Atomicjar, Crate.io, CrateDB, Crossbeam, Flexciton, General Index, Houzz, InfoSum, Inherent, Iridius, and 15 more.
Where did Mike Chalfen go to school?
Mike Chalfen studied at Harvard University (History, Philosophy); University of Cambridge (Master of Arts (MA), History).

Same school

Shared employers