Jan Hammer
Investor & Partner @ Index Ventures
London, United Kingdom
Jan Hammer is a Series A investor at Index Ventures in London focused on Health Care and Medical. Jan Hammer is the partner at Index and the Board observer of Harmonic. Jan attended Oxford University.
- Total investments:
- 148
- Last investment:
- Lead investor:
- 39%
Last updated:
For AI agents: llms.txt
Industries Jan Hammer invests in
Stages Jan Hammer invests in
Countries Jan Hammer invests in
Round sizes
Contacts
| Type | Contact | Validation |
|---|---|---|
| Work email | ||
| Personal email | ||
| Work phone | ||
| Personal phone | ||
| Socials |
Round size
- Seed
- $2.5M–$20M
- Series A
- $3M–$35M
- Series B
- $14M–$150M
Investment Focus
Industry
- Health Care 17 (11%)
- Medical 16 (11%)
- Medical Device 9 (6%)
- Biotechnology 7 (5%)
- Manufacturing 6 (4%)
Stage
- Series A 27 (18%)
- Series B 17 (11%)
- Seed 10 (7%)
- Angel 4 (3%)
- Series C 4 (3%)
Country
- China 31 (21%)
- United States 6 (4%)
- France 2 (1%)
- Czech Republic 2 (1%)
- United Kingdom 2 (1%)
Investments
| Company | Description | Round | Links |
|---|---|---|---|
| Mistral AI develops artificial intelligence models, applications, and infrastructure for organizations and developers. | $3.5B / Series D / Sep 08, 2026 | ||
| Alan provides online digital insurance services focusing on health and wellness. The company offers health insurance services, providing solutions tailored to the needs of different types of businesses. It provides simple and seamless insurance coverage and easy claim handling. It gives access to medical professionals for users to easily andconveniently get medical advice and manage claims and reimbursements. | $544.6M / Series G / Jun 24, 2026 | ||
| Alan provides online digital insurance services focusing on health and wellness. The company offers health insurance services, providing solutions tailored to the needs of different types of businesses. It provides simple and seamless insurance coverage and easy claim handling. It gives access to medical professionals for users to easily andconveniently get medical advice and manage claims and reimbursements. | Secondary Market / Jun 24, 2026 | ||
| Behavox is an enterprise platform that unifies all types of data into a single data lake, allowing users to query the data and apply machine learning to identify capital markets misconduct and insider threats.Separate Behavox installations form the network defence that aggregates misconduct detection algorithms. The network then uses machinelearning and AI to optimise detection algorithms and suggest new ones. This innovation enables the “brains” to the system to continuously improve and evolve.Complex, high-load and sophisticated engineering is at the core of all the products that Behavox develops to enable deployment at the largest institutions in financial services. They are taking cutting-edge academic research and applying it to enterprise problems that require complex backend engineering with large-scale production footprint. | $173.2M / Private Equity / Jun 17, 2026 | ||
| Moment develops AI software for investment management and wealth management operations. The company provides tools for financial advisors and investment firms to manage portfolios, workflows, and investment processes. | $78M / Series C / May 19, 2026 | ||
| Adfin makes getting paid better for everyone. Our single platform gives businesses - and their accountants - the tools to get paid: faster, cheaper, easier.Our platform intelligently manages payment request workflows and payment methods so business don’t have to - giving them the time to build better businesses. Adfin's payment networkpresents payers with best-in-class experiences which reward them for paying faster. AI-driven workflows automate credit control. And everything reconciles seamlessly back to accounting software. Adfin is the best way to get paid: so good, customers love paying. | $18M / Series A / May 12, 2026 | ||
| Cowboy Space is a space infrastructure company focused on developing systems for in-orbit computing, space-based power, and launch capabilities. The company is building Low Earth Orbit satellites designed to harness solar energy and support data processing applications in space. Its approach integrates launch vehicles and orbital data centers intoa single system, with rocket upper stages intended to remain in orbit as operational computing platforms. Cowboy Space is also working on technologies related to transmitting energy from space to Earth and supporting high-performance computing beyond terrestrial infrastructure. The company’s team includes engineers and specialists with experience from aerospace, satellite, and technology organizations. | $275M / Series B / May 11, 2026 | ||
| Alan provides online digital insurance services focusing on health and wellness. The company offers health insurance services, providing solutions tailored to the needs of different types of businesses. It provides simple and seamless insurance coverage and easy claim handling. It gives access to medical professionals for users to easily andconveniently get medical advice and manage claims and reimbursements. | $115.6M / Venture - Series Unknown / Mar 11, 2026 | ||
| Duna is redefining business identity. It will evolve into a network for shareable identity – making onboarding as simple as one click. | $35.5M / Series A / Feb 04, 2026 | ||
| Duvo is an agentic automation platform designed for enterprise businesses, particularly in retail and FMCG sectors. | $15M / Seed / Dec 02, 2025 | ||
| See all 148 investments → | |||
Co-Investors
About Index Ventures
Index Ventures is a venture capital firm which helps entrepreneurs turn bold ideas into global businesses.
Index Ventures Contacts
| Name | Phone | Socials | |
|---|---|---|---|
Georgia Stevenson
Partner
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Gerald Rimer
Team Member
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Hannah Seal
Principal/Partner
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Jan Hammer
Investor & Partner
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Julia Andre
Principal/Partner
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FAQ
What does Jan Hammer invest in?
Jan Hammer invests primarily in Health Care, Medical and Medical Device startups, most often at Series A and Series B stage. Most of the 148 investments tracked by Shizune back companies in China. The Investment Focus section breaks down every industry, stage and country in the portfolio.
What is Jan Hammer's check size?
Jan Hammer typically joins rounds of $2.5M–$20M at Seed, $3M–$35M at Series A and $14M–$150M at Series B. These ranges are 10th–90th percentile round sizes calculated from confirmed public funding rounds, so they are a realistic guide to the rounds Jan Hammer participates in.
How do I contact Jan Hammer?
Public channels for Jan Hammer include LinkedIn, X (Twitter) and the website linked on this profile. For a verified work email and phone number, create a free Shizune account — contact data is searched across 20+ sources and validated before delivery, so your outreach lands in the right inbox.
When did Jan Hammer last invest?
The most recent investment recorded for Jan Hammer closed in Sep 2026. Shizune tracks 148 investments in total for this profile, including round sizes, stages and portfolio companies, all sourced from confirmed public funding rounds and refreshed monthly.
Is Shizune's investor data accurate?
Yes — every stat on this profile is calculated from confirmed public funding rounds monitored across hundreds of sources since 2020. This profile was last refreshed in Sep 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.
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