# Arthur Kosten

> Arthur Kosten is a seed investor at Festicket (Leiden) backing Education and E-Learning. See 14 investments, check sizes, portfolio. Updated Aug 2026.

- Type: Angel Investor
- Fund: [Festicket](https://shizune.co/investors/profile/festicket)
- Location: Leiden, The Netherlands
- Total investments: 14
- Last investment: Jun 2025
- Lead investor: 0%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/in/arthurkosten/
- X (Twitter): http://twitter.com/ajknws
- Facebook: http://www.facebook.com/arthur.kosten

Arthur Kosten is a Co Founder @ Booking.com.

## Round sizes

| Stage | Round size |
| --- | --- |
| Seed | $750k–$4M |
| Pre-Seed | $2M–$2.7M |
| Series B | $31M–$35M |

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Education | 3 | 21% |
| E-Learning | 2 | 14% |
| Apps | 1 | 7% |
| EdTech | 1 | 7% |
| Retail | 1 | 7% |

23 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Seed | 3 | 21% |
| Pre-Seed | 2 | 14% |
| Series B | 2 | 14% |
| Series A | 1 | 7% |
| Series C | 1 | 7% |

7 stages tracked in total.

### Country

| Country | Investments | Share |
| --- | --- | --- |
| The Netherlands | 3 | 21% |
| Germany | 2 | 14% |
| United States | 2 | 14% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Knowunity | Knowunity is the digital learning platform with summaries, study notes, presentations, answers, and more in one app. | $31.2M | Series B | Jun 13, 2025 |  |
| Cruisebound | Cruisebound is a travel agency on a mission to make the joy of cruising available to the masses by simplifying the booking experience. | $2.7M | Convertible Note | Sep 03, 2021 |  |
| Cruisebound | Cruisebound is a travel agency on a mission to make the joy of cruising available to the masses by simplifying the booking experience. | $2.7M | Pre-Seed | Sep 03, 2021 |  |
| Detail | Detail Technologies is a virtual camera that you can use in Zoom, Loom, Meet, Whereby, or your favorite streaming software. | $2M | Pre-Seed | Mar 09, 2021 |  |
| Preply | Preply is a provider of an online tutoring marketplace intended to promote faster learning with one-on-one online tutors. The company's marketplace helps to find and book professional private tutors online from over 185 countries, enabling users to achieve their goals and speak confidently. | $35M | Series B | Mar 09, 2021 |  |
| Preply | Preply is a provider of an online tutoring marketplace intended to promote faster learning with one-on-one online tutors. The company's marketplace helps to find and book professional private tutors online from over 185 countries, enabling users to achieve their goals and speak confidently. | $10M | Series A | Mar 30, 2020 |  |
| Hubs | Hubs, formerly 3D Hubs, is an online platform for custom part manufacturing, providing access to a global network of manufacturing services, including CNC machining, 3D printing, injection molding and sheet metal fabrication. Founded in Amsterdam in 2013, Hubs was acquired by Protolabs in January 2021 and has produced 7 million parts. | $20M | Series C | Mar 26, 2019 |  |
| Preply | Preply is a provider of an online tutoring marketplace intended to promote faster learning with one-on-one online tutors. The company's marketplace helps to find and book professional private tutors online from over 185 countries, enabling users to achieve their goals and speak confidently. | $4M | Seed | Jul 24, 2018 |  |
| Deskbookers | Deskbookers is an online platform for businesses and individuals to find flexible space... offices, meeting and training rooms and flex desks. The company is based in Amsterdam, the Netherlands. The site is currently available in Dutch, German, and English. | $750K |  | Aug 01, 2017 |  |
| Deskbookers | Deskbookers is an online platform for businesses and individuals to find flexible space... offices, meeting and training rooms and flex desks. The company is based in Amsterdam, the Netherlands. The site is currently available in Dutch, German, and English. | $750K | Seed | Aug 01, 2017 |  |

10 of 14 investments shown.

## Co-investors
- [Point Nine](https://shizune.co/investors/profile/point-nine-capital) — VC Fund, 6 deals together
- [Diligent Capital Partners](https://shizune.co/investors/profile/diligent-capital-partners) — VC Fund, 3 deals together
- [Educapital](https://shizune.co/investors/profile/educapital) — VC Fund, 3 deals together
- [Acurio Ventures](https://shizune.co/investors/profile/acurio-ventures) — VC Fund, 2 deals together
- [Acurio Ventures](https://shizune.co/investors/profile/all-iron-ventures) — VC Fund, 2 deals together
- [Hoxton Ventures](https://shizune.co/investors/profile/hoxton-ventures) — VC Fund, 2 deals together

## About Festicket

VC Fund · London, United Kingdom

Festicket empowers music fans with a seamless service to discover and book tickets and travel packages for music festivals worldwide. The platform offers an end-to-end experience for music travelers, an efficient two-sided marketplace for 1,000+ music festivals across 40 different countries, and a network of 2,000 suppliers for accommodation andtravel packages.

5 contacts available at Festicket.

| Name | Title | Profile |
| --- | --- | --- |
| Arthur Kosten | Advisor | https://shizune.co/investors/profile/arthur-kosten |
| Jerome Elfassy | Co-founder | https://shizune.co/investors/profile/jerome-elfassy |
| Jonathan Younes | Co-founder & CPO | https://shizune.co/investors/profile/jonathan-younes |
| Matt Ephgrave | COO | https://shizune.co/investors/profile/matt-ephgrave |
| Stephanie Rosa | Business Development Manager | https://shizune.co/investors/profile/stephanie-rosa |

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## FAQ

### What does Arthur Kosten invest in?

Arthur Kosten invests primarily in Education, E-Learning and Apps startups, most often at Seed and Pre-Seed stage. Most of the 14 investments tracked by Shizune back companies in The Netherlands. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### What is Arthur Kosten's check size?

Arthur Kosten typically joins rounds of $750k–$4M at Seed, $2M–$2.7M at Pre-Seed and $31M–$35M 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 Arthur Kosten participates in.

### When did Arthur Kosten last invest?

The most recent investment recorded for Arthur Kosten closed in Jun 2025. Shizune tracks 14 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 Aug 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.

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