General Info
Willem Sijthoff is a strategic and prominent investor with a focus on technology, consumer, tech, and healthcare sectors. His investment portfolio includes Catawiki, an online auction house. Willem Sijthoff typically invests in the Series B stage, as seen in his investment in Catawiki in 2014. He has a track record in publishing and a professional career rooted in the publishing legacy of the Sijthoff family. The investment check size for Willem Sijthoff’s investments is illustrated by his â¬10 million investment in Catawiki. His partnership and collaboration styles are not explicitly defined in available sources.
Location: Amsterdam, Noord-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: low-active
AI Reasoning: Search results show Willem Sijthoff’s only documented investment was in Catawiki (Series B) on Sep 24, 2014. No evidence of investments since then in 2015-2025 sources. That means the last known investment was more than 12 months ago (over 11 years). Therefore classification: low-active.
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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