Stephen Marcus
InvestorFounderGeneral Partner at Riot Ventures · Director at Nodal Networks · Board director at Shield AI · Founder at Riot Ventures ↗︎
Los Angeles, California
Writes $3M checks · typically $1.5M
FoundedRiot Ventures ↗︎
Find your path to Stephen
595 people in our graph share verified history with Stephen — schools, employers, funds. One of them is your warm intro.
Laura BuhlerunlockedStephen: together at Stripe (2025–2026)
×7Stephen: together at Stripe
Stephen: together at EnduroSat
Stephen: together at MIT Sloan School of Management
About
Stephen Marcus, a six-time founder/CEO with 20+ years building large-scale wireless networks and datacenters, brings deep infrastructure and hardware expertise and a record of frontier bets that produced IPOs.
Contact· self-published, not guessed
Invests in
AI & Machine LearningCybersecurityDeep TechDefense TechHardwareLogistics & Supply ChainRoboticsSpace Tech
Director at Nodal Networks
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Nodal Networks's investors · 2
Board director at Shield AI
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In turn, Stephen can intro founders to Shield AI's investors below.
Shield AI's investors · 42
645 VenturesNew York · $1M – $5M checksAdvaita CapitalBostonAdvent InternationalBoston · $1.1B checks · since 2025Alpha PartnersNew York · $3M – $10M checksAltra VentureNew York City · $500K – $25M checksAndreessen HorowitzMenlo Park · $500K – $50M checks · since 2022Beyond CapitalSan DiegoBlackstonesince 2025Bloomberg BetaSan Francisco · $25K – $1M checksBooz Allen VenturesBrave CapitalSan RafaelBreyer CapitalAustin · $500K – $10M checks · since 2022Brighter CapitalCupertino · $25K – $100K checksCenter15 CapitalLos AngelesChaos VenturesNew YorkCortado VenturesOklahoma CityCraft VenturesSan Francisco · $50K – $50M checksDisruptiveDallas · since 2025Dorm RoomBrooklyn · $90K – $250K checksE1 VenturesSan FranciscoFounder CollectiveCambridgeHomebrewBurlingame · $100K – $500K checks · since 2022Inertia VenturesNew York · $2M checksInflection VenturesNew YorkJuniperoMiamiK2 GlobalSingaporeKinled HoldingHong KongLevel VenturesSunny Isles BeachManhattan WestLos AngelesNearingpoint Venture Partners Inc.TorontoPoint72 VenturesNew York · $1M – $75M checks · since 2022Prime Movers LabJackson · $2M – $30M checks · since 2025R7 PartnersChicago · $100K – $5M checksRiot VenturesVenice · $3M checks · since 2025Riverbend CapitalWashingtonRosecliff VenturesNew York City · $500K checksSnowpointPalm Beach · since 2026SnowPoint VenturesWest Palm Beach · since 2025Stack CapitalTorontoU.S. Air Forcesince 2019WealthUnion$10K checksWP Global PartnersChicago · $5M – $25M checks
Co-founders at Shield AI
BT
Brandon TsengPresident & Co-Founder
RT
Ryan TsengPresident, Co-Founder & Chief Strategy Officer
AR
Andrew ReiterCo-Founder
Founder at Riot Ventures ↗︎
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Riot Ventures ↗︎'s investors · 2
Co-founders at Riot Ventures ↗︎
WC
Will CoffieldFounder
Experience
- Riot VenturesCo-Founder & General Partnercurrent2015 — presentLos Angeles Metropolitan Area
- EnduroSatBoard Membercurrent2025 — present
- Blue Water AutonomyBoard Membercurrent2025 — present
- Nodal NetworksBoard Membercurrent2024 — present
- Valar AtomicsBoard Membercurrent2023 — presentLos Angeles, California, United States
- Mango IncBoard Membercurrent2022 — present
- KindoBoard Membercurrent2022 — presentLos Angeles, California, United States
- Shield AIBoard Membercurrent2019 — presentSan Diego County, California, United States
- Toast, Inc.Investorcurrent2019 — presentGreater Boston
- MIT Deshpande CenterCatalystcurrent2016 — presentCambridge, MA
- Okta, Inc.Angel Investorcurrent2010 — present
- StripeAngel Investorcurrent2014 — present
- Matchbox, Inc.Founder & CEO2011 — 2015Greater Boston
- MIT Sloan School of ManagementMember of Admissions Committee2009 — 2011
- Invincea, Inc.Board Observer2008 — 2011
- New Atlantic VenturesVenture Partner2008 — 2011
- Marcus CompaniesCEO2001 — 2010
- SprintMergers and Acquisitions Consultant2000 — 2007
Skills & more
Strategy9Management4Leadership3Enterprise Software11SaaS2Venture Capital45Start-ups99Mergers10Wireless5Mobile Devices26Entrepreneurship59Cloud Computing7
+12 more
E-commerceMobile ApplicationsMergers & AcquisitionsTelecommunicationsProduct ManagementProduct MarketingProgram ManagementStrategic PartnershipsCompetitive AnalysisAngel InvestingNetworkingAnalyticsLanguages English · Spanish
From Stephen's professional profile.
Investments
Board seats
Blue Water AutonomyEndurosatKindoMangoShield AIValar Atomics
Per the firm's website.
Colleagues at Riot Ventures
Frequently asked questions
- Who is Stephen Marcus?
- Stephen Marcus, a six-time founder/CEO with 20+ years building large-scale wireless networks and datacenters, brings deep infrastructure and hardware expertise and a record of frontier bets that produced IPOs.
- Where does Stephen Marcus work?
- Stephen Marcus is Founder of Riot Ventures ↗︎ and General Partner at Riot Ventures and Board director at Shield AI.
- What does Stephen Marcus invest in?
- Stephen Marcus invests in AI & Machine Learning, Cybersecurity, Deep Tech, Defense Tech, Hardware, Logistics & Supply Chain, Robotics, Space Tech.
- What check size does Stephen Marcus write?
- Stephen Marcus typically writes checks of $3M.
- What companies did Stephen Marcus found?
- Stephen Marcus founded Riot Ventures ↗︎.
- What boards does Stephen Marcus sit on?
- Stephen Marcus holds tracked board seats at Blue Water Autonomy, Endurosat, Kindo, Mango, Shield AI, Valar Atomics.
- Where did Stephen Marcus go to school?
- Stephen Marcus studied at MIT Sloan School of Management (MBA, Entrepreneurship & Venture Capital); Worcester Polytechnic Institute (BS).
Same school
Also attended MIT Sloan School of Management937
Doug LeonePartner at Sequoia Capital; former Global Managing PartnerHemant TanejaCEO & Managing Director of General CatalystBrad FeldCo-founder of Foundry and TechstarsChris MorrisProcess Specialist, Exit Readiness at Mayfair Equity PartnersBirgitteInvestor at InvestinorOlaInvestor at Investinor
+ 931 more
Also attended Worcester Polytechnic Institute100
Steve VassalloInvestor at Foundation CapitalAbe MurrayGeneral Partner at AlleyCorpCharles White, Ph.D.Principal at Illumina VenturesJiong MaInvestor at Phoenix Venture PartnersJill GoldsteinPrincipal at Vida VenturesGregor KevrekianPartner at Healthier Capital
+ 94 more
Shared employers
Also worked at Blue Water Autonomy2
Also worked at Valar Atomics8
Abe MurrayGeneral Partner at AlleyCorpKim-Mai CutlerInvestor at Initialized CapitalJean WeillAssociate at C4 VenturesDoug PhilipponePartner & Co-Founder at SnowpointHisham ElhaddadManaging Partner at HOF CapitalJoe MusselmanInvestor at BVVC
+ 2 more
Also worked at Stripe247
Hemant TanejaCEO & Managing Director of General CatalystMatt HuangCo-founder and Managing Partner at ParadigmLuciana LixandruPartner at Sequoia CapitalPatrick CollisonCo-founder & CEO of StripeJohn CollisonCo-founder & President of StripeGreg BrockmanCo-founder & President of OpenAI
+ 241 more
Also worked at MIT Sloan School of Management149
Isabelle StyslingerSenior Associate, Rise of the Rest at RevolutionNoubar AfeyanInvestor at Flagship PioneeringIsabelle TashimaSr. Associate at Volition CapitalAkanksha MehtaInvestor at TRANSFORMATION CAPITALRandy CohenHarvard Business School Professor at FemHealth VenturesAqil PashaVice President at Jump Capital
+ 143 more