Resistant AI, out of Czechia, tackles fincrime and fraud prevention with new €21 million
Prague’s Resistant AI, a provider of native AI models for financial crime and fraud prevention, today announced a €21 million Series B funding round to expand its document fraud detection and transaction monitoring offerings into new territories and partnerships, and build out its threat intelligence capabilities.
The round was led by DTCP, with participation from existing investors including Experian, GV, and Notion Capital who are doubling down on their investment.
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 fincrime 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.”
Resistant AI’s Series B places it among the larger mid-stage raises in Europe’s evolving AI-driven FinTech and RegTech landscape of 2025.
Comparable rounds include Finary’s €25 million investment to scale its AI-powered wealth tools, and Light’s €25 million Series A to replace legacy finance systems with AI-native infrastructure. Smaller but thematically aligned rounds, such as Semeris’ €4 million for generative-AI tools in FinTech and Allasso’s €2.5 million to enhance financial analytics, show a broader investor appetite for AI systems improving financial security and compliance.
Within this climate, Resistant AI’s profitable growth and focus on advanced fraud and transaction-monitoring models underscore a maturing European RegTech segment, further supported by investors such as Notion Capital’s new €114 million fund targeting AI-driven software and FinTech innovation.
Michael Rager, Partner at DTCP Growth, said: “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.”
Founded in 2019, Resistant AI produces document fraud detection and transaction monitoring models that make FinTech AI and automation systems resilient to manipulation and attack – without replacing their existing tech stack.
By analysing everything from submitted documents to ongoing customer behaviours, Resistant AI claims to uncover and prevent document forgery, large-scale serial fraud, synthetic identities, account takeovers, money mules, money laundering, APP fraud, and previously unknown financial threats.
Companies that use Resistant AI services reportedly see a 3x increase in doc fraud prevention, 5x faster review times, 90% automation rates, and a 5x increase in second line analyst productivity.
The new funding comes as the anti-fraud and RegTech market is being transformed by fully-native or bolted-on agentic solutions that replace static workflows with cheaper, smarter adaptive ones. However, Resistant AI says these LLM-based agents are structurally unable to perform the quantitative risk analysis needed to combat fraud and fincrime, suffer from high systemic hallucination rates of 10-30%, and have proven extremely difficult to keep secure from adversarial manipulation.
Financial crime is itself undergoing an AI-driven transformation and growing at unprecedented speed with 35% of businesses reporting being hit by GenAI-related fraud.
Meanwhile, Resistant AI’s Threat Intelligence research shows the Fraud-as-a-Service economy is rapidly maturing with easy-to-search online markets selling over 160,000 verified accounts from more than 3,000 financial institutions to fuel APP scams that have reportedly already cost the economy a trillion dollars.
Since its Series A, Resistant AI’s ARR has increased 10x, while its customer base has grown 4x. The service has now verified over 150 million documents, and the number of transactions analysed for fraud and AML has grown 100x as demand for advanced fraud detection capabilities across the financial services sector soars.
The company continues to protect a growing roster of global financial institutions, FinTechs, and enterprises, building on its existing customer base that includes Dun & Bradstreet, Payoneer, Close Brothers, PennyMac, AXA, Anna Money, Finom, and Bank of Va lletta. Resistant AI now employs over 100 team members across offices in Prague, London, and New York.
EU-Startups previously covered Resistant AI’s €14.28 million Series A round in 2021, which focused on strengthening its AI models for document and transaction fraud detection within financial automation systems.
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