General Info
Sebastian Siemiatkowski is a renowned investor known for his investments primarily in Consumer and Enterprise Applications sectors. His previous investments include Omio, Budbee, and Depop. Sebastian’s track record showcases successful investments, including the unicorn company Omio. While information on his investment check size and partnership styles is limited, he is preparing Klarna for an IPO in the US, indicating a significant move in his investment strategy.
Location: Stockholm, Stockholms Lan, Sweden
Country: Sweden
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 recent public activity by Sebastian Siemiatkowski in 2025: he is involved in transactions and control moves related to Flat Capital / Double Sunday AB and Klarna (e.g., proposals and share transfers reported Sep-Oct 2025). This demonstrates he engaged in investment-related actions within the last 6 months (less than 6 months prior). Example startup/company involved: Klarna/Double Sunday AB. Based on these events occurring in Sep-Oct 2025 and using the provided reference date, his most recent investment-related activity is under 6 months ago, so classify as very-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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