ChillStack

Based in Shibuya, Japan, ChillStack is a cybersecurity firm founded in 2018 that leverages artificial intelligence to offer advanced security solutions. The company operates on a business-to-business model, providing services to corporate clients and collaborating with government agencies to address complex societal challenges. Revenue is generated through its portfolio of AI-driven security services and products. Since its inception, ChillStack has secured $2.75 million in funding over two rounds, with its Series A in September 2024 raising $2.47 million from investors including HERO Impact Capital, DEEPCORE, Colopl Next, SMBC Venture Capital, and Global Brain.

ChillStack's core offerings are designed to detect and analyze threats within a company's digital infrastructure. A key product is "Stena Expense," an AI-powered system that analyzes employee expense reimbursement data to automatically identify fraudulent or improper claims, such as duplicate submissions or inflated transportation costs. This tool integrates with existing expense management systems to enhance internal governance and improve the productivity of accounting departments. Another specialized product, "Stena Game," provides security for online gaming platforms by detecting cheating and other forms of fraud. Beyond these products, the firm offers comprehensive security diagnostics, AI security consulting, and works with partners like Mitsui Bussan Secure Direction to provide training on the safe implementation of AI technologies. The company's technical strength lies in its ability to perform multi-dimensional analysis of time-series data and its expertise in AI red teaming—proactively testing AI systems for vulnerabilities.

Keywords: AI security, cybersecurity, fraud detection, expense management, anomaly detection, B2B SaaS, security consulting, machine learning security, threat analysis, governance solutions, risk management, online game security, AI red teaming, time-series data analysis, corporate security, government cybersecurity, Stena Expense, Stena Game, Japanese startup, venture capital