Resistant AI Secures $25M Series B To Strengthen Fintechs And AI Against Financial Crime

The company develops document fraud detection and transaction monitoring models that strengthen fintech AI and automation systems without replacing existing technology.

Its solutions, Resistant Documents and Resistant Transactions, verify document authenticity in seconds and enhance rules-based transaction monitoring with over 80 models targeting advanced financial crime. Customers include Dun & Bradstreet, Payoneer, Close Brothers, AXA, PennyMac, Bank of Valletta, and Finom.

Investors include DTCP, GV (formerly Google Ventures), Index Ventures, and Notion Capital. Resistant AI’s machine learning models detect fraud in documents, transactions, and behaviours, boosting precision, recall, and contextual decision-making. They protect against sophisticated crimes like real-time payment fraud, synthetic corporate identity fraud, money muling, generative AI document fraud, and complex money laundering.

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Since its $27 million Series A, Resistant AI’s ARR has grown 10x, customers 4x, with over 150 million documents verified and transactions analyzed increasing 100x. The funding comes as the regtech market shifts toward smarter, adaptive AI solutions that traditional LLM agents struggle to secure or optimize.

Martin Rehak, CEO and Founder of Resistant AI, said, "The financial crime landscape has fundamentally changed with the deployment of LLMs and AI agents in risk prevention settings, and the weaponisation of generative AI by fraudsters.”

“Our fraud and finance crime models offer any institution the tools to empower both their human and agentic co-pilots to combat these AI-powered threats at scale.

This funding, combined with our near-term path to profitability, allows us to accelerate our mission of protecting the global financial system from increasingly sophisticated criminal networks."

The round was led by DTCP, with significant participation from existing investors such as GV and Notion Capital, who are increasing their stake in the company.

Michael Rager, Partner at DTCP Growth, comments: "Resistant AI represents the future of financial crime prevention, with their in-house built multi-model approach to fraud detection marking a paradigm shift in how financial institutions can protect themselves and their customers.

We look forward to partnering with Martin and the Resistant AI team to support the business in its next stage of growth."

The company, which reached breakeven in September, plans to use the funding to strengthen its position as a profitable EU AI leader by expanding its document fraud detection and transaction monitoring capabilities.

About Resistant AI

Resistant AI is a leading fraud detection platform specializing in document and transaction monitoring. With over 150 million documents analyzed, its AI-powered system helps businesses verify authenticity, prevent fraud, and strengthen compliance efficiently and accurately.