Fundraising FoxBuilder Capital
Venture capitalPre-Seed–Seed
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Investment thesis
Builder Capital invests in early-stage scientists and engineers turning breakthrough scientific ideas into real systems, machines, and infrastructure. The firm focuses on hard technical problems it believes will define the next era of progress, concentrating on computation, photonics, robotics, and energy. Its cryptographic systems thesis centers on blockchain rails for on-chain finance, stablecoins and real-world assets, along with quantum-resistant encryption such as zero-knowledge proofs and fully homomorphic encryption. In photonics it backs light-based approaches that surpass electronic limits in bandwidth, latency and energy efficiency. In robotics it supports autonomous machines that perceive, decide and act in the physical world. It believes the hardest problems create the most enduring companies.
Source: firm website, verified Aug 3, 2026.
What they invest in
from 12 of 13 portfolio companiesAI & Machine Learning ×10Cloud Computing ×3Crypto & Web3 ×3Data & Infrastructure ×3Developer Tools ×3Fintech ×2Hardware ×2B2B Marketplaces ×1
HQs:United States×6
Investments · 13 tracked
founders shown can be your intro pathBy year:2025 · 12023 · 23 dated
Helika builds Helika Evolve, a brand-safe AI character platform that lets IP owners deploy interactive characters trained on their approved content to engage fans in real time across Discord, web, social, and community channels.
AI & Machine LearningGamingMarketing Tech
Anton(Founder & CEO)Ilya(CPO)
Co-investorsDiagramPantera CapitalBig Brain HoldingsFenbushi CapitalSparkle VenturesFermion
Aethir operates a distributed cloud compute platform providing enterprise-grade GPU resources for AI model training, fine-tuning, inference, and low-latency cloud gaming.
AI & Machine LearningCloud ComputingCrypto & Web3
Mark Rydon(Founder)in
Co-investorsAndromeda CapitalAnimoca BrandsBeamBig Brain HoldingsCVP NoLimitGTS Ventures+13 more
Airstack offers an AI-based quant engineer tool that codes trading strategies and identifies issues ("leaks") in them, aimed at quantitative trading users.
AI & Machine LearningData & InfrastructureFintechMiami Beach, US
Jason Goldberg(Executive Officer, Director)in
Co-investorsBlack DragonDelta BlockchainFenbushi CapitalLecca VenturesRed Beard VenturesResolute Ventures+16 more
Antimetal builds an autonomous system that operates production infrastructure by continuously monitoring, diagnosing, and fixing issues across software systems.
AI & Machine LearningCloud ComputingDeveloper ToolsNew York City, US
Shreyas Iyer(Founder)in
Co-investorsChapter OneHawk Hill VenturesIDEO CoLab VenturesBuckley Ventures Management Company LlcFramework VenturesPolygon Ventures+1 more
Astek Diagnostics develops a diagnostic platform for rapid and accurate detection of urinary tract infections and related conditions in clinical specimens.
AI & Machine LearningBiotechDigital HealthHealthtechMedical DevicesBaltimore, US
Mustafa Al-Adhami(Founder)inCourtney Cavin(Cofounder)in
Co-investorsMaryland TEDCOTEDCOY CombinatorAJGAYANA Capital LLCHarvard Management Company+3 more
Coinflow provides global payment processing infrastructure enabling businesses to accept payments, settle funds, and expand internationally with instant settlement and fraud protection.
B2B MarketplacesFintechChicago, US
Daniel Lev(Founder & CEO)inBenjamin Meeder(Founder)in
Co-investorsCoinbase VenturesDigital Currency GroupDraper DragonFactionPantera CapitalReciprocal Ventures+4 more
Ethos built a Sui blockchain wallet and developer tooling for discovering and using decentralized applications.
Co-investorsgumi IncWWVenturesboldstart venturesgumi Cryptos Capital (gCC)Meltem DemirorsMysten Labs+1 more
Feather builds deployment-grade robotic hardware and an open SDK (Python and ROS2) that lets automation and AI companies deploy their trained models onto physical robots without doing their own hardware R&D.
AI & Machine LearningHardwareRobotics
Co-investorsGeometryGradient VenturesLongHash Ventures
Grass is a peer-to-peer network that monetizes unused residential internet bandwidth by connecting users with institutions that need data connectivity, compensating participants with points and tokens.
Crypto & Web3Data & Infrastructure
Andrej R(Founder)in
Co-investorsCollab+Currency
Neurophos develops photonics and metamaterials-based compute hardware, combining optical systems with analog and digital silicon.
AI & Machine LearningDeep TechHardwareSemiconductorsAustin, US
Patrick Bowen(Executive Officer, Director)inAndrew Traverso(Founder)inHod Finkelstein(Executive Officer)inPreston Woo(Executive Officer)in
BoardChristopher Alliegro(Director)Nathan Kundtz(Director)
Co-investorsAlumni VenturesBeyond Earth VenturesBosch VenturesDnx VenturesDuke Capital PartnersGeometry+9 more
Octane builds an AI-native security analysis tool that continuously reasons about code to find novel vulnerabilities across functions, files, and execution paths.
AI & Machine LearningCybersecurityDeveloper Tools
Co-investorsArchetypeDuke Capital Partners
Octra provides encrypted computation infrastructure for blockchain, AI, and applications.
AI & Machine LearningCrypto & Web3Data & Infrastructure
Co-investorsBig Brain HoldingsFinality Capital Partners
Prodia provides APIs for high-quality image and video generation using generative AI, delivered at scale without requiring GPU provisioning or infrastructure management.
AI & Machine LearningCloud ComputingDeveloper ToolsSaaS
Shawn Wilkinson(Founder)inMonty Anderson(CEO, CTO)in
Co-investorsEv3 Ventures LlcSymbolic CapitalTRGCWeb3com VenturesIndex VenturesOKX Ventures
Portfolio news
latest coverage across their companies
Neurophos · techcrunch.com · Feb 14, 2026
Frequently asked questions
- How many investments has Builder Capital made?
- Builder Capital has 13 tracked investments, including 1 dated in the last 24 months.
- What stage does Builder Capital invest at?
- Builder Capital invests at the Pre-Seed, Seed stages.
- What sectors does Builder Capital focus on?
- Builder Capital focuses on Advanced Manufacturing, AI & Machine Learning, Crypto & Web3, Deep Tech, Fintech, Hardware, Robotics, Semiconductors.
- Who does Builder Capital co-invest with?
- Builder Capital most often shares deals with Big Brain Holdings, Duke Capital Partners, Geometry, among 45 tracked co-investors.
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