Stephen Marcus
Co-Founder & General Partner at Riot Ventures
Los Angeles County, California
Stephen Marcus, Co-Founder & General Partner at Riot Ventures is an active investor based in Los Angeles County, California. This profile covers what Stephen Marcus backs, at which stage, and how founders can reach out in 2026.
- Investor type
- AngelVCPE
- Stages
- Pre SeedSeedEarly Stage VentureSeries A
- Invests in
- Robotics & AutomationSaaS & EnterpriseConsumer & RetailFintechSpace & AerospaceCybersecurityArtificial Intelligence
- Location
- Los Angeles County, California
- Typical check
- $1M
- Past investments
- 19
Notable investments
Simbe RoboticsToast, Inc.
AquaCloudBlue Water Autonomy
OktaOkta, Inc.
Moda Operandi
Stripe
SentenaiHow to reach Stephen Marcus
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About this profile
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Cite this page
Round Funded. "Stephen Marcus." Round Funded investor database, updated September 27, 2026.
Stable URL, it will not change: https://www.roundfunded.com/en/investor/stephen-marcus
Frequently Asked Questions
What does Stephen Marcus invest in?
Stephen Marcus invests in Robotics & Automation, SaaS & Enterprise, Consumer & Retail and Fintech, typically at Pre Seed, Seed, Early Stage Venture and Series A. Match your sector and stage, then reach out with a personalized pitch.
What stage does Stephen Marcus invest at?
Stephen Marcus typically invests at Pre Seed, Seed, Early Stage Venture and Series A. Lead with traction that fits the stage when you reach out.
What is Stephen Marcus's typical check size?
Stephen Marcus typically writes checks around $1M. Use it as a signal for whether your raise fits their stage.
How do founders reach investors like this?
Round Funded lists active investors with verified, professional contact details for signed-up founders. Filter by sector, stage and location, then send a personalized pitch from your own inbox.
What is Round Funded?
Round Funded is an investor database and outreach platform for startup founders. It lists 60,000+ active investors with verified contacts, filtered to recent investment activity, and lets founders send personalized pitches from their own Gmail, track replies, and share a free Data Room. Round+ starts at $99 per month with a 3-day trial.