Venture-Backed Startups

0 investors

Cast Iron Media is a media sales and advertising company with sales teams organized by U.S. region, offering campaign management, ad operations, programmatic revenue, and sponsorship and media sales services.

1 investor

0 investors

CAST develops film piezoelectric sensors that are heat-resistant, flexible, and thin, used as measurement systems for industrial monitoring. Its products include a pipe wall thinning monitoring system for detecting structural degradation.

1 investor

2 investors

Castalie is a French company that designs and supplies eco-designed premium water fountains delivering microfiltered still, sparkling, chilled, and hot water for companies, hotels, and restaurants. Its solution replaces single-use plastic bottles, and it operates across France with over 7,000 fountains installed since 2011.

1 investor

Castari Cloud is a deployment and runtime platform for AI agents built with the Claude Agent SDK, letting developers ship agents to isolated auto-scaling cloud sandboxes with a single command. It offers features such as an MCP gateway, model routing across AI providers, and agent observability, though the company states it is winding down Castari Cloud and open-sourcing the repo.

1 investor

3 investors

Castelion develops advanced strike systems and defense hardware with a focus on rapid iteration and scalable manufacturing to reduce costs and development timelines for U.S. defense applications. The company aims to restore American industrial agility in weapons development and strengthen national security capabilities.

14 investors

0 investors

Castellum provides AI-powered AML/KYC compliance automation for banks, credit unions, fintechs, and digital asset firms to identify financial crime risk and reduce false positives. The platform uses proprietary risk data, a screening engine, and AI agents to accelerate compliance decisions.

9 investors

Castelnau Group is an investment company that acquires businesses with competitive advantages and focuses on long-term capital allocation to build shareholder value across a diversified portfolio.

1 investor

0 investors

Castform is a self-service platform for reinforcement-learning fine-tuning of open-source models, letting engineers auto-generate training data from existing corpuses and agent traces, define tools and reward functions, and run distributed training. It targets engineers and researchers building custom RAG and agentic AI models, with pay-as-you-go pricing and exportable trained weights.

1 investor

A rent payment platform serving Latin American tenants and landlords that provides rewards, flexible payment options, credit-building features, and savings programs tied to housing payments.

2 investors

1 investor

0 investors

CastingCraft is a casting management platform for casting directors, agents, and production companies to publish castings, collect actor and model submissions (photos/videos), manage applications, communications, and schedules, and build shortlists and presentations for clients. It maintains a database of actor and model profiles and lets agents manage their talent's applications. Aimed at the Russian-language market.

1 investor

CastingN (캐스팅엔) builds procurement spend-management software for Korean companies, starting with the country's first indirect-purchasing bidding platform and expanding into medical and healthcare brokerage. It is preparing to launch ZENO, an AI-based indirect-procurement spend-management OS, for enterprise buyers in South Korea.

1 investor

CastIron.me is a Canadian online casino review and comparison platform that helps players find trusted operators and navigate the gambling space through transparent, research-driven guidance focused on payout reliability, licensing, and player protections.

1 investor

Castle is a platform for creating, playing, and sharing games built by a community of creators. Users can develop games using an integrated editor, share them socially, and interact with other players through reactions, comments, and remixes.

2 investors

Castle provides a digital payments platform using Same-day ACH and Real Time Payments for real estate transactions, including earnest money deposits, cash to close, and diligence payments. It is aimed at buyers and parties handling property closing payments, offering payment tracking and an alternative to sharing wire instructions over email.

1 investor

Castle offers a treasury yield management product that lets DAOs and other liquidity providers put their treasury assets to work in DeFi according to their risk profile. It focuses on risk-mitigated yield strategies for DAOs and their communities.

1 investor

Reddy Book is an online sports betting and live gaming platform offering cricket, football, and casino games with real-time odds and account management tools. The platform serves users across India seeking sports markets and live gaming experiences.

1 investor