Resistant AI, a Prague-based cybersecurity and fraud prevention startup, has raised €21.5 million ($25 million) in a Series B funding round to expand its fight against AI-driven financial crime and strengthen its position as a profitable European AI leader.
The round was led by DTCP, with participation from existing backers including Experian, GV (Google Ventures), and Notion Capital. The raise comes just two months after Experian made a strategic investment in the company, underscoring growing global urgency around AI-enabled fraud prevention.
DTCP Partner Michael Rager commented:
“Resistant AI represents the future of financial crime prevention. Their multi-model approach to fraud detection is redefining how financial institutions can protect themselves and their customers. We’re excited to partner with Martin and the team as they enter their next stage of growth.”
Scaling Fraud Prevention in the Age of Generative AI
Founded in 2019 by Martin Rehak, Resistant AI develops machine learning systems that protect financial services from manipulation, document forgery, and sophisticated cyberattacks.
The company’s suite of products includes:
- Resistant Documents, which authenticates financial documents in seconds.
- Resistant Transactions, which enhances traditional rules-based transaction monitoring by detecting emerging fraud and money laundering typologies before they occur.
Resistant AI’s 80+ off-the-shelf AI models deliver explainable, real-time insights into anomalies such as synthetic identities, account takeovers, serial fraud, and coordinated money laundering. Together, they provide a 360° view of customer behaviour and can double threat detection rates while boosting analyst productivity by up to 5x. of the market.”
Advertisement
From Break-Even to Global Expansion
Resistant AI reached breakeven in September 2025 and has seen explosive growth since its Series A:
- 10x increase in Annual Recurring Revenue (ARR).
- 4x growth in customer base.
- 150+ million documents verified to date.
Its clients include Anna Money, Bank of Valletta, Moneta Money Bank, and Finom, among others.
The fresh capital will be used to expand into new regions, strengthen threat intelligence, and enhance document fraud detection and transaction monitoring capabilities. The company also plans to establish new partnerships to accelerate adoption across Europe and North America.
Battling the Next Wave of AI-Powered Fraud
“The financial crime landscape has fundamentally changed,” said Martin Rehak, CEO and Founder of Resistant AI. “Fraudsters are now weaponising generative AI, while financial institutions deploy LLMs and AI agents for risk prevention. Our mission is to empower both human and agentic co-pilots to combat these evolving threats at scale. This funding, combined with our profitability trajectory, allows us to protect the global financial system from increasingly sophisticated criminal networks.”
Resistant AI employs over 100 people across Prague, London, and New York, and continues to position itself as one of Europe’s most advanced defenders against AI-enabled fraud.
About Resistant AI
Resistant AI develops artificial intelligence systems that safeguard financial services against manipulation, document fraud, and money laundering. Its explainable, multi-model technology enhances fraud detection and compliance efficiency for banks, fintechs, and regulators worldwide — helping institutions detect novel threats before they occur and ensure trust in an AI-driven financial era.
