General Info
Arthur Kosten is an investor who generally invests about US$200,000 to US$1 million in marketplace platforms for expansion in Europe. His focus areas include marketplace platforms, with investments in companies like Catawiki, Preply, and Tonsser. Arthur Kosten’s previous investments include Catawiki, Preply, and Tonsser. He has a track record as the former CMO and co-founder of Booking.com, a key player in the acquisition reshaping the travel landscape. The size of his investments ranges from $200K to $1M, with a sweet spot around $200K. Arthur Kosten has been involved in successful partnerships and collaborations within different sectors of society.
Location: Leiden, Zuid-Holland, The Netherlands
Country: Netherlands
Industries:
Investment Regions: EU
Investment Stages: pre-seed, seed
angel-individual
EU
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🤖 AI Activity Report
Status: very-active
AI Reasoning: I found a June 13, 2025 Series B investment in Knowunity that lists multiple investors in coverage (FinSMEs, EU-Startups, Silicon Canals). Arthur Kosten is reported to have participated in Knowunity’s €27M Series B on Jun 13, 2025. The time between that investment and the reference date is under 6 months, so classify as very-active. Example startup invested: Knowunity.
Angel activity thresholds:
Low Activity – Only known angel investments more than 12 months ago.
Active – Known angel investments between the last 12 and 6 months.
Very Active – Known angel investments in the last 6 months.
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