General Info
Stephen Marcus, Managing Partner & Founder at Riot Ventures, focuses on investing in deep technologies with a particular emphasis on companies innovating in program management software, space defense, AI, quality control for pharmaceutical production, and more. Riot Ventures invests in very early-stage ventures. Stephen Marcus has been involved in previous investments in True Anomaly and operates as a venture capital firm seeking to invest in early-stage companies. The check size range for Riot Ventures is $1M – $3M and $3M – $10M. Riot Ventures primarily serves the technology industry and is based in Venice, California.
Location: Boston, MA
Country: United States of America
Industries:
Investment Regions:
Investment Stages: pre-seed, seed
angel-individual
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🤖 AI Activity Report
Status: very-active
AI Reasoning: I found evidence that Riot Ventures (Stephen Marcus) participated in an investment in True Anomaly on April 30, 2025 (Series C) and other 2025 investments. The most recent known investment is April 30, 2025, which is less than 6 months prior to the reference date, indicating very recent activity.
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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