Prague-based Resistant AI funding has closed a $25 million Series B funding round led by DTCP Growth, with existing investors Experian, Google Ventures (GV), and Notion Capital participating.
The company, which reached breakeven in September 2025, will use the capital to expand document fraud detection, transaction monitoring, and threat intelligence capabilities across Europe.
What is Resistant AI?
Founded in 2019 by Martin Rehak, Resistant AI builds native AI models that detect document fraud, transaction risks, and money laundering schemes for financial institutions.
The company operates from Prague, London, and New York with over 100 team members, serving clients including Dun & Bradstreet, Payoneer, AXA, and Bank of Valletta.
Its two core products—Resistant Documents and Resistant Transactions—integrate with existing banking systems without requiring infrastructure replacement.
Resistant Documents verifies documents for authenticity in seconds, while Resistant Transactions deploys 80+ specialized models to flag advanced financial crime patterns.
Why This Round Matters?
Financial crime has exploded with the rise of generative AI, with 35% of businesses reporting GenAI-related fraud.
Resistant AI's research shows Fraud-as-a-Service marketplaces now sell over 160,000 pre-verified accounts from 3,000+ financial institutions.
Since its Series A extension, Resistant AI achieved 10x ARR growth, 4x customer expansion, and 100x increase in transaction analysis volume. The company has verified over 150 million documents to date.
Michael Rager, Partner at DTCP Growth, noted that Resistant AI's multi-model approach represents a major shift in financial crime prevention, offering quantitative risk analysis that LLM-based agents struggle to deliver.
Key Deal Facts
Who led the Resistant AI funding round?
DTCP Growth led the $25 million Series B, with participation from Experian, GV, and Notion Capital.
What will the funding support?
Expansion of document fraud detection and transaction monitoring, building threat intelligence infrastructure, and entering new markets through partnerships.
How fast is the company growing?
Resistant AI posted 10x ARR growth and 4x customer expansion since Series A, with transaction monitoring volume increasing 100x year-over-year.
Resistant AI Funding: Capital Raised Overview
| Funding Round | Amount Raised | Lead Investor | Date | Post-Money Valuation | Key Participants |
|---|---|---|---|---|---|
| Series B | $25.0M | DTCP Growth | October 2025 | Not Disclosed | Experian, GV, Notion Capital |
| Series A Extension | $11.0M | Notion Capital | June 2023 | Not Disclosed | GV, Index Ventures, Credo Ventures |
| Series A | $16.6M | GV | October 2021 | Not Disclosed | Index Ventures, Credo Ventures, Seedcamp |
Strong revenue growth (10x ARR), proven product-market fit with tier-one enterprise customers, breakeven profitability, and addressing the trillion-dollar fraud problem with defensible AI technology.
Connect with Resistant AI
| Platform | Link |
|---|---|
| Website | https://resistant.ai |
| https://www.linkedin.com/company/resistant-ai | |
| Twitter/X | https://x.com/resistantai |
| CEO LinkedIn | https://cz.linkedin.com/in/martinrehak |
What's Next?
With profitability achieved and fresh capital, Resistant AI is positioned to scale threat intelligence capabilities while maintaining low false-positive rates.
As regulators implement mandatory reimbursement rules for fraud victims, financial institutions increasingly need advanced detection technology.
The company faces challenges in scaling operations while staying ahead of Fraud-as-a-Service markets. If Resistant AI maintains its 10x growth trajectory while remaining profitable, it could become the standard for AI-powered financial crime prevention.
