We're building trade software that actually works. Our first product is duty drawback. Every year $10B in potential refunds are left unclaimed. Data is unstructured, fragmented and trapped in legacy systems that don't talk to each other. We're helping companies organize and understand their trade data. Leveraging the wedge product, we intend to quickly grow beyond our initial product.

We're simplifying global trade compliance and helping importers navigate the trade environment, starting with duty drawback—a tax recovery process that puts cash back into importers' hands. Our platform transforms messy trade data into actionable insights, helping businesses recover from the estimated $10B in unclaimed refunds each year.

We’re building an AI-powered home manager: a proactive, chat-first system that helps homeowners stay ahead of bills, maintenance, documents, and expenses. We are backed by founders of Freshly ($1.5B), Kustomer ($1B), and more.

Cassidy is a no-code platform that allows businesses to build custom AI assistants that automate complex multi-step workflows. By connecting to a company’s knowledge (docs, wikis, calls, etc.) and leveraging major AI models, Cassidy aims to be the “AI colleague” for every team—helping them work 100x faster without heavy engineering overhead. We're well funded, growing incredibly fast and have an insane distribution advantage in a growing market.

Castle is a YC-backed Series A startup helping companies like Canva, Atlassian, and Rockstar Games fight fraud and abuse. They are building modern, AI-powered bot detection and abuse prevention tech, with a focus on real-time protection and behavioral intelligence.

Castleton Commodities is an energy fund with engineers in London, New York, and Houston.

Castleton Tower is a boutique consulting firm founded by executives who have built and led quantitative research, data science, and technology teams at top-tier hedge funds and asset managers. We work with investment management firms (asset allocators, asset managers, hedge funds, family offices, and RIAs) helping them modernize their data infrastructure and build AI-ready foundations. We're looking for smart, motivated, high-agency people with similar backgrounds in either data engineering or investing. We have postings up on job boards, but if you email me a resume and 2 sentences you wrote on why you'd be a good fit, I will guarantee it gets looked at.

Category Labs (formerly known as Monad Labs) is a team of systems engineers and researchers on a mission to design and build at the frontier of decentralized technology. We strive to design and build step-function improvements over existing blockchain solutions. After recently raising $225M in series A funding, led by Paradigm, we are growing our team.

Cathmere is a seed-stage startup revolutionizing how capital flows to emerging markets through our innovative fintech platform.

Cemit is a data intelligence company with ambitions to lead a digital transformation of the railway industry globally. As a scale-up supported by top-tier investors, we are a dynamic and customer-centric organization with R&D at the core of our DNA. Our platform collects data from trains or tracks and uses machine learning and analytics to provide real-time insight into the health of the trains and tracks to drastically improve maintenance efficiency and rail uptime. Together we are leading an intelligent shift that will increase the reliability, affordability, and efficiency of rail transportation, enabling a greener future.