Jan Hammer
InvestorFounderGeneral Partner at Index Ventures · Board director at Resistant AI
United Kingdom
Writes $500K – $50M checks · typically $15M
Midas 2026 · #79Midas 2025 · #50Midas 2024 · #59Midas 2023 · #18Midas 2022 · #17Midas 2021 · #14Midas 2020 · #47Midas 2019 · #38Midas 2018 · #100
About
Jan Hammer specializes in backing formative, non-obvious startups rebuilding finance and data infrastructure—favoring full-stack fintech approaches (e.g., Adyen) and early bets on companies like Collibra, Wise and Robinhood.
Likely email· guessed from name + firm domain, not firm-published
- j•••@indexventures.comreveal70% confident
Invests in
ConsumerEnterprise SoftwareSaaS
Board director at Resistant AI
Intro paths
→
In turn, Jan can intro founders to Resistant AI's investors below.
Resistant AI's investors · 6
Credo VenturesPrague · $1M – $5M checks · since 2021DTCPBerlin · since 2021GV (Google Ventures)Mountain View · $250K – $50M checks · since 2021Index VenturesSan Francisco · $540K – $10.8M checks · since 2021Notion CapitalLondon · $1M – $100M checks · since 2021SeedcampLondon · $378K – $1.1M checks · since 2021
Co-founders at Resistant AI
MR
Martin RehakExecutive Officer, Director
MG
Martin GrillDirector
JJ
Jan JuskoFounder
JS
Jan StiborekFounder
KB
Karel BartošFounder
LM
Lukáš MachlicaFounder
Experience
- Index VenturesPartnercurrent2010 — presentGreater London, England, United Kingdom
- AdyenInvestor2011 — 2018The Randstad, Netherlands
- RobinhoodBoard Member2013 — 2021Redwood City, CA
- AetherfluxInvestorcurrent2025 — present
- AlanBoard Membercurrent2018 — presentGreater Paris Metropolitan Region
- MomentBoard Membercurrent2025 — present
- TebiInvestorcurrent2024 — present
- Tema ETFsInvestorcurrent2023 — present
- SpikoBoard Observercurrent2025 — present
- ParallelBoard Observercurrent2026 — present
- HarmonicBoard Observercurrent2024 — present
- Mistral AIInvestorcurrent2023 — present
- duvo.aiBoard Observercurrent2025 — present
- Rohlik.czBoard Membercurrent2021 — present
- DunaInvestorcurrent2025 — present
- CapitolisBoard Membercurrent2017 — presentNew York
- CollibraBoard Membercurrent2015 — presentBrussels Metropolitan Area
- ValderaBoard Observercurrent2024 — present
- AtlarInvestorcurrent2022 — present
- ApronBoard Membercurrent2023 — present
- RemoteBoard Observercurrent2020 — present
- Resistant AIBoard Membercurrent2019 — presentPrague, Czechia
- ComplyAdvantageBoard Membercurrent2019 — presentLondon Area, United Kingdom
- DuffelBoard Observercurrent2019 — presentGreater London, England, United Kingdom
- SafetyCulture Pty LtdInvestorcurrent2016 — presentGreater Sydney Area
- TateCo-Chair of CEEPAC Acquisition Committeecurrent2025 — presentLondon Area, United Kingdom
- WiseInvestor2011 — 2021Greater London, England, United Kingdom
- Just-Eat GroupBoard Observer2011 — 2014London Area, United Kingdom
- General AtlanticPrincipal2003 — 2010
Education
- INSEADMBA with Distinction2001 — 2002
- University of OxfordMA, Philosophy1995 — 1998
- Aiglon CollegeHigh School1993 — 1995
Skills & more
Venture Capital43Private Equity28Technology businesses3Financial Services10
Languages Czech · French · Slovak
From Jan's professional profile.
Deals · 1
Cowboy Space CorporationQuoted
via Index Ventures · filed Apr 2026
Attribution from SEC filings, press coverage, and firm rosters.
Colleagues at Index Ventures
Adrianna Ma
Investor at Index Ventures
Ali Fisher Sweet
Investor at Index Ventures
Ana Andreescu
Investor at Index Ventures
André Dubois
Investor at Index Ventures
Avron Marcus
Investor at Index Ventures
Bastian Hasslinger
Investor at Index Ventures
Ben Sneider
Investor at Index Ventures
Benjy Boateng
Investor at Index Ventures
Network12
Adrianna MaScout
Investor at Index Ventures
Alex NicholsScout
Investor at CapitalG
Arthur BernardScout
Managing Partner at Athletico Ventures
Bernard DalleScout
Partner at Index Ventures
Brett RochkindScout
Managing Partner, Americas at SoftBank Vision Fund
Charlie CheeverScout
Angel
Christian JensenScout
Partner at Dragoneer Investment Group
Damir BecirovicScout
Investor at Index Ventures
Dana Eli-LorchScout
Partner at Vesey Ventures
Emil SchaeferScout
Investor at Index Ventures
Erik KriessmannScout
Partner at Altimeter Capital
Theo OsborneScout
Managing Partner at 9Yards Capital
Investors connected to Jan in public investor directories — a warm-intro map.
Frequently asked questions
- Who is Jan Hammer?
- Jan Hammer specializes in backing formative, non-obvious startups rebuilding finance and data infrastructure—favoring full-stack fintech approaches (e.g., Adyen) and early bets on companies like Collibra, Wise and Robinhood.
- Where does Jan Hammer work?
- Jan Hammer is General Partner at Index Ventures and Board director at Resistant AI.
- What does Jan Hammer invest in?
- Jan Hammer invests in Consumer, Enterprise Software, SaaS.
- What check size does Jan Hammer write?
- Jan Hammer typically writes checks of $500K – $50M.
- Where did Jan Hammer go to school?
- Jan Hammer studied at INSEAD (MBA with Distinction); University of Oxford (MA, Philosophy); Aiglon College (High School).
Same school
Also attended INSEAD776
Alexandre ProtCo-founder & CEO of QontoSteve AnaviCo-founder & President of QontoPatrick ClaessenPartner at Cottonwood Technology FundChris BischoffInvestment Team at General CatalystSandra SchwarzerInvestor at Index VenturesStephane KurganInvestor at Index Ventures
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+ 770 more
Also attended University of Oxford955
Reid HoffmanCo-founder of LinkedIn; Partner at GreylockMichael MoritzFormer Partner at Sequoia Capital; Senior Adviser at Sequoia HeritageBrad GerstnerFounder & CEO of Altimeter CapitalGabriel PereyraCo-founder & President of HarveyDominic JacquessonInvestor at Index VenturesErin Price-WrightInvestor at Index Ventures
+ 949 more
Shared employers
Also worked at Aetherflux4
Also worked at Alan9
Stephane KurganInvestor at Index VenturesShakil KhanCo-Founder at Prima MateriaBing GordonInvestor at G2 Venture PartnersJean de La RochebrochardManaging Partner at Kima VenturesHenry FontanierFounder/Engineer at GoosebumpBruno VegrevilleFounder at Hera
+ 3 more
