Stephen Marcus

Active Investor

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 SeedSeedSeries ASeries BLate Stage Venture
Invests in: SaaS & EnterpriseConsumer & RetailFashion & BeautyClimate & EnergyDeveloper Tools & DataCybersecurityHardware & Deep TechRobotics & Automation
Location: Los Angeles County, California
Typical check: $1M
Past investments: 19

Notable investments

Invincea, Inc.Mango IncEnduroSatSimbe RoboticsToast, Inc.AquaCloudBlue Water AutonomyOktaOkta, Inc.Moda OperandiStripeSentenai

How to reach Stephen Marcus

Angels and operators like Stephen Marcus reply to specific, personalized notes that show real traction, not mass blasts. Build a verified list, write a note that fits their thesis, and track replies, all on Round Funded.

Frequently Asked Questions

What does Stephen Marcus invest in?

Stephen Marcus invests in SaaS & Enterprise, Consumer & Retail, Fashion & Beauty and Climate & Energy, typically at Pre Seed, Seed, Series A and Series B. Match your sector and stage, then reach out with a personalized pitch.