General Info
Samuli Siren is the CEO and Founder of Redstone, a Berlin-based Venture Capital firm focusing on Built World, Sustainability, FinTech, Health, Industrial, Quantum, and Social Impact. His previous investments include Newtracks. Samuli Siren mainly invests in Pre-seed Real Estate/PropTech startups. In terms of partnership and collaboration styles, specific details were not found on the webpage. The investment check size and stage of investment were not provided on the Redstone Team page.
Location:
Country: Finland
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 found an investment by Samuli Sirén in Newtracks, but that funding round dates back many years (2012 per Crunchbase). No recent investments surfaced in Google searches or on his profiles up through 2025. The last known investment therefore occurred more than 12 months ago, placing him in the low-activity category.
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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