Fourth Realm
Venture capitalActively deployingMenlo Park · 6 people tracked
Find your way into Fourth Realm
663 people in our graph share verified history with the Fourth Realm team — schools, employers, funds. One of them is your warm intro.
Investment thesis
Fourth Realm invests in mission-driven founders who demonstrate intense founder-problem-fit — strong alignment between a founder's core skills and the critical needs of their venture — believing these founders execute with urgency and high competency. The firm was built on the observation that many venture investors fall into stale, rigid thinking, default to pattern-matching, and shield themselves from risk in ways that cause them to miss some of the most innovative startups. Fourth Realm positions itself to support and capitalize on those overlooked opportunities, embracing innovation whether it comes through gradual progress or rapid breakthroughs.
Source: firm website, verified Aug 23, 2026.
Team · 6 people
from curated & public directoriesWhat they invest in
from 28 of 39 portfolio companiesSaaS ×11Enterprise Software ×10AI & Machine Learning ×9Future of Work ×5Data & Infrastructure ×4Deep Tech ×4Fintech ×4Healthtech ×4
HQs:United States×17Philippines×1
Who they back
founder profiles across 24 portfolio companiesFounding team size:solo founder×112 founders×113 founders×14+ founders×1
Where their founders studiedfrom 32 founders with education data
Massachusetts Institute of Technology ×4Indian Institute of Technology, Delhi ×2The Wharton School ×2University of California, Berkeley ×2
Where their founders worked beforefrom 34 founders with career history
Atrium ×2Chiper ×2OpenPhone ×2Square ×2
Accelerator rootsportfolio companies that came through a program
4 founders hold a PhD · 7 hold an MBA (of 32 with degree data)
Investments · 39 tracked
founders shown can be your intro pathBy year:2022 · 12021 · 12018 · 13 dated
Securing the world's data
Palo Alto, US
Bipul Sinha(Co-Founder, Chairman & Chief Executive Officer)inArvind Nithrakashyap(Co-Founder, Chief Technology Officer & Director)inArvind Jain(Co-Founder (former; departed to found Glean))inSoham Mazumdar(Co-Founder (former))inKiran Choudary(Chief Financial Officer)inJesse Green(Chief Revenue Officer)in
Co-investorsAnicut CapitalBain Capital VenturesChamaeleonEngineering CapitalEQUIAMEvolution VC Partners+15 more
Revolutionizing space technology to make life multi-planetary
Hawthorne, US
Elon Musk(Founder, CEO & Chief Engineer)in
Co-investors1/1 Capital137 Ventures4DX VenturesA*Abstract VenturesAccess Technology Ventures+110 more
Avion School is a coding bootcamp that teaches web development skills to beginners and career-switchers, offering programs in JavaScript and Ruby with job placement support for graduates.
EdTechManila, PH
John Young(Founder)in
Co-investorsY Combinator
Barn2Door provides software and services for farmers to sell their products online and in person, automating orders, payments, inventory, email campaigns, and delivery logistics.
AgTechE-commerceFoodTechSaaSSeattle, US
Janelle Maiocco(Founder)inJAMES MAIOCCO(Executive Officer, Director)
BoardDUNCAN DAVIDSON(Director)inKATHY CHILL(Director)
Co-investorsBullpen CapitalConductor CapitalFf Venture CapitalSocial StartsDecathlon Capital PartnersGlobal Founders Capital+2 more
Co-investorsWXR Fund
Colombian B2B e-commerce platform that lets neighborhood corner shops restock inventory online with next-day delivery.
Bogota
Jose Jair Bonilla(Executive Officer, Director)inOscar Sarria(Founder)in
BoardSimon Borrero(Director)
Co-investorsAlter GlobalFEMSA VenturesFlucas VenturesInQlabKube VCMONASHEES+9 more
Team82 is a cybersecurity vulnerability and threat research team that identifies software and firmware vulnerabilities in cyber-physical systems.
AI & Machine LearningCybersecurityIoT
Galina Antova(Founder)inYaniv Vardiin
BoardDavid Millstone(co-CEO of Standard Industries and co-CIO of Standard Investments)
Co-investorsArcher Capital GroupArcher Venture CapitalB CapitalBessemer Venture PartnersBMW i VenturesBosch Ventures+15 more
Cohesity provides cyber resilience software that helps organizations identify and protect the minimal critical datasets and systems needed to restart operations after ransomware attacks or disasters.
Cloud ComputingCybersecurityData & InfrastructureEnterprise SoftwareSan Jose, US
Mohit Aron(Founder Emeritus)inSanjay Poonen(CEO and President)inTIMOTHY ROBBINS(Executive Officer)inLORENZO MONTESI(Executive Officer)inROB SALMON(Executive Officer)in
BoardWILLIAM COUGHRAN(Director)in
Co-investorsAccelAdit Ventures Management, LlcArtis VenturesBattery VenturesCisco InvestmentsCoatue Management+20 more
Emulate builds Organ-on-a-Chip systems, including platforms, consumables, and pre-assembled BioKits with validated human cell models, to support drug discovery research.
BiotechDeep TechHealthtech
Donald Ingber(Scientific Founder, Board Member, Scientific Advisory Board Chairman)inDaniel Levner(Co-Founder & CTO)inJim Corbett(CEO, Board Member)inLorna Ewart(Chief Scientific Officer)in
Co-investors+ND CapitalNorthpond VenturesAlwyn CapitalStray Dog CapitalOS FundStarlight Ventures
Enable Us provides buyer enablement capabilities that allow customers to view tailored content and get answers.
Enterprise SoftwareSaaS
Co-investorsFresco Capital
Enki provides a platform that trains employees on AI and data tools relevant to their workflows, with customized learning plans, personal mentorship, and team collaboration features to drive organizational adoption.
AI & Machine LearningEdTechEnterprise SoftwareFuture of WorkHR TechSaaS
Kirill Makharinsky
Expedock builds dedicated remote outsourcing teams, supported by Operations Managers and QA specialists, that handle back-office workflows such as freight operations, documentation, billing, data annotation, RLHF, model evaluation, and healthcare administration.
AI & Machine LearningFuture of WorkLogistics & Supply Chain
Jeff Tan(Founder)in
Co-investorsDorm RoomFoxmont Capital PartnersInsight PartnersKickstart VenturesWebb Investment NetworkDecent Capital+2 more
Fieldguide provides automated workflows and collaborative tools for assurance and advisory practices to serve clients more effectively.
AI & Machine LearningEnterprise SoftwareFuture of WorkSaaSSan Francisco, US
Jin Chang(Founder)inChris Szymansky(CTO / Co-Founder)in
Co-investors8VCBessemer Venture PartnersFloodgateGeodesic CapitalPoint72 VenturesY Combinator
Gr4vy provides a cloud-based payment orchestration platform that enables merchants and payment platforms to manage their payment strategies without coding.
Enterprise SoftwareFintechSaaS
John Lunn(CEO & Founder)inAli Minaei(Co-founder & CTO)inCristiano BettainOlga Tish(CFO)inZubin Vandrevalain
Co-investorsActivant CapitalFirestartrMarch Capital PartnersNycaNyca Partners
Great Expectations provides a data quality and governance platform that enables teams to define, test, and monitor data expectations across their data systems with automation and collaborative tools.
Data & InfrastructureDeveloper ToolsEnterprise Software
Co-investorsCRV (Charles River Ventures)SAV (Scale Asia Ventures)Zero Prime VenturesMedMountain Ventures
Kahoona provides a context generation layer for websites that interprets visitor behavior — a data modality it calls Digital Body Language — to understand and act on anonymous users and AI agents before login or identity exists.
AI & Machine LearningData & InfrastructureMarketing Tech
Alon Ashkenasi(Founder)in
Co-investors91 Ventures
Varda industrializes low Earth orbit by manufacturing pharmaceuticals and other specialized products in space, then returning them to Earth via reusable reentry capsules.
BiotechDeep TechSpace TechEl Segundo, US
Will Bruey(Co-founder)inDelian Asparouhov(Co-founder)in
Co-investorsAlso CapitalCaffeinated CapitalFounders FundKhosla VenturesLux CapitalGeneral Catalyst+25 more
Co-investorsInterplay Ventures Early Stage Management LlcKapor Capital
Overfit combines human coaching for accountability with AI-generated personalized workout plans for fitness users seeking guidance and customized exercise routines.
AI & Machine LearningHealthtechWellness & FitnessSan Francisco, US
Ajay Saini(Founder)inVahid Fazel-Rezai(Founder)in
Co-investorsY Combinator
Pahdo Labs is building an online multiplayer game designed as a persistent, shared virtual world where players create, own, and share content and pursue long-term mastery.
ConsumerGamingMedia & EntertainmentNew York, US
Co-investorsAndreessen HorowitzBoxGroupGlobal Founders Capital2 Punks CapitalScott SunartoLong Journey Ventures
Parlor is a domain intelligence service that ranks expired domains by SEO authority, ingesting auction feeds and zone files every six hours and scoring each domain on seven signals to surface a shortlist worth bidding on.
Data & InfrastructureMarketing TechSaaS
Perl Street provides financial infrastructure and software for renewable energy investors and developers to manage capital deployment, compliance, and operations related to clean energy projects, particularly those funded through the Greenhouse Gas Reduction Fund.
B2B MarketplacesCleantechClimate TechFintechSaaSAustin, US
Tooraj Arvajeh(Founder)inArvind Vermani(Founder)in
Co-investorsGarage CapitalKeiki CapitalMS&AD VenturesY CombinatorClimate CapitalThird Sphere
Quadrant Eye develops at-home diagnostic technology to conduct comprehensive eye examinations.
AI & Machine LearningHealthtechMedical DevicesSan Francisco, US
Quinn Wang(Founder)inKristine Hara(Founder)
Co-investorsY Combinator
Quo is a cloud-based business communication platform that provides a modern phone system for small businesses to connect with customers and manage relationships.
Cloud ComputingEnterprise SoftwareFuture of WorkSaaSSan Francisco, US
Mahyar Raissi(Founder/CEO)inDaryna Kulya(Founder)inThomas Andrew DeLong(Executive Officer)Naman Desai(Executive Officer)Todd Goldstein(Director, Promoter)Amit Patel(Executive Officer, Director, Promoter)
Co-investorsChapter OneCraft VenturesGarage CapitalKindred VenturesVisary CapitalY Combinator+4 more
Reality Defender provides real-time detection of AI-generated and manipulated media across multiple channels including calls, video conferences, and communications workflows.
AI & Machine LearningCybersecurityEnterprise Software
Co-investorsBantam GroupSLVCZillionizeArgon VenturesDCVC (Data Collective)
Sirona Medical builds RadOS, a cloud-native platform that reimagines radiology practice in the AI age for physicians and radiology practices.
AI & Machine LearningDigital HealthHealthtechSan Francisco, US
Cameron Andrews(Founder & President)inAnkit Goyal(Executive Officer, Director)
BoardFrancisco Gimenez(Director)in
Co-investors8VCGreatPoint VenturesRose Park AdvisorsGlobal Founders CapitalXfund
Stoke Space develops Nova, a fully and rapidly reusable rocket, along with a reusable upper-stage vehicle for on-demand access to orbit and in-space operations such as asset capture, repositioning, and cargo logistics.
Deep TechHardwareSpace Tech
Andy Lapsa(Founder)inTom Feldman(Founder)in
Co-investorsIndustrious Ventures
Stripe provides financial infrastructure for businesses to accept payments, offer financial services, and implement custom revenue models across international markets in 135+ currencies.
Developer ToolsFintechSaaSSan Francisco, US
John Collison(Co-founder & President)inPatrick Collison(Co-founder & CEO)inWilliam Gaybrick(Executive Officer)inGreg Brockman(Founding Engineer, then first CTO)inSarah Heckin
BoardMichael Moritz(Director)in
Co-investors500 GlobalAdvaita CapitalAglae VenturesAir Street CapitalAlkeon InnovationAndreessen Horowitz+60 more
TalkShop.live is a live shopping platform where users watch live video streams and buy featured products directly during the broadcast, using its patented shoppable embedded point-of-sale technology.
E-commerceMedia & EntertainmentRetail Tech
Bryan Moore(Founder)inTina Moore(Founder)in
Co-investorsFlucas VenturesProgress VenturesSpero Ventures
Text Blaze is a productivity tool that creates text snippets and templates to reduce repetitive typing across web applications.
Developer ToolsEnterprise SoftwareFuture of WorkSaaSSan Francisco, US
Dan Barak(Founder)inScott Fortmann-Roe(Founder)inDan B(Founder)in
Co-investorsY CombinatorSusa VenturesTwo Sigma Ventures
Tilled provides payment facilitation services delivered as a software-as-a-service platform, enabling software companies to embed payment processing capabilities, monitor merchant transactions, and generate revenue from payments across the U.S. and Canada.
Enterprise SoftwareFintechSaaSBoulder, US
Caleb Avery(Executive Officer, Director)inJohn Allen(Executive Officer, Director)
BoardBen Capell(Director)Rebecca Lynn(Director)inAbhinav Tiwari(Director)John Wallington(Director)
Co-investorsBootstrap Venture PartnersCanvas VenturesClocktower VenturesG SquaredService Provider CapitalTRAC (Third Round Analytics Capital)+4 more
Venice, US
Paul Eremenko(Executive Officer, Director)
Co-investorsTrucks VCAirbus VenturesCoatue ManagementGlobal Founders CapitalHAWKTAILMitsubishi HC Capital+4 more
A Vietnamese-language football streaming site offering live match links, schedules, scores, standings, highlights and sports news for leagues such as the Premier League, Champions League and V-League.
ConsumerMedia & Entertainment
Co-investorsBling Capital
Zap Energy develops advanced nuclear systems built on a shared platform combining fission and fusion, delivering modular reactors that produce firm, carbon-free electricity and process heat.
CleantechDeep TechEnergy
Benj Conway(Founder)in
Co-investorsEnergy Impact Partners
Exits · 3
IPOs and acquisitions across the tracked portfolioRubrikNYSE: RBRKSpaceXNASDAQ: SPCXEnable Usacq. by MindTickle
Portfolio news
latest coverage across their companiesCohesity · en.wikipedia.org · Sep 2, 2026
SpaceX · businessinsider.com · Aug 16, 2026

Stripe · techcrunch.com · Jul 20, 2026
Pahdo Labs · thedesignlab.blog · Feb 6, 2026
Fieldguide · internationalaccountingbulletin.com · Feb 3, 2026
Sirona Medical · medicaldevice-network.com · Oct 31, 2025
Quo (fka OpenPhone) · quo.com · Sep 23, 2025
Frequently asked questions
- How many investments has Fourth Realm made?
- Fourth Realm has 39 tracked investments, 3 of which have exited via acquisition or IPO.
- Where is Fourth Realm located?
- Fourth Realm is headquartered in Menlo Park, US.
- Who does Fourth Realm co-invest with?
- Fourth Realm most often shares deals with Y Combinator, 8VC, Bessemer Venture Partners, among 154 tracked co-investors.


















