Who founded Resistant AI?

Resistant AI was founded by Martin Rehak, Martin Grill, Jan Jusko, Jan Stiborek, Karel Bartoš, Lukáš Machlica in 2020.

Who are Resistant AI's investors?

Resistant AI's investors include GV (Google Ventures), Index Ventures, Notion Capital, Seedcamp, Credo Ventures, DTCP, Experian Ventures, IDEO.

How much funding has Resistant AI raised?

Resistant AI has disclosed $37.5M raised across 2 of its 4 known rounds.

Where is Resistant AI headquartered?

Resistant AI is headquartered in Lewes, US.

Resistant AI

Lewes, US · Founded 2020 · Delaware corporation · 165 employees on LinkedIn · 8 known investors

Find your way into Resistant AI

Paths you didn't know you had: your email and LinkedIn already hold routes to the Resistant AI team. We find them for you
2nd- and 3rd-degree connections: the friend-of-a-friend routes that take hours to manually find through your inbox or LinkedIn
Answers now, not in days: momentum is everything in a raise. Skip asking around whether someone knows someone

Days of research, done the moment you sign in, with every route ranked by how warm it is.

Resistant AI provides AI-powered software that detects fraud in documents — including fake, tampered, or AI-generated files — and adds a fraud and money-laundering detection layer to existing transaction monitoring systems. It serves fraud and compliance analysts in fintech and financial services for use cases such as merchant onboarding, loan underwriting, claims processing, AML, and APP fraud.

AI & Machine Learning Cybersecurity Fintech

Founders & leadership

Martin Rehak CEO & FounderCEO and director of Resistant AI, which builds AI-powered software to detect document fraud and add fraud and money-laundering detection to transaction monitoring systems for fintech and financial services. His work focuses on secure, robust machine learning and protecting financial systems from adversarial attacks and misuse.

Martin Grill Co-Founder & Researcher & Team leadMartin Grill is a machine learning researcher with expertise in anomaly detection, ensemble systems, user behavior analysis, and adversarial machine learning. He is Director at Resistant AI, which provides AI-powered document fraud detection and transaction monitoring software for financial services.

Jan JuskoCo-Founder & Researcher

Jan StiborekCo-Founder

Karel Bartoš Co-FounderKarel Bartoš brings experience in machine learning applied to network security, including work on network traffic classification, intrusion detection systems, and distributed data fusion. He is founder of Resistant AI, which develops AI-powered software for detecting fraud in documents and transaction monitoring.

Lukáš MachlicaCo-founder & Researcher

Karel BartosFounder

Lukas MachlicaFounder

Board

Ondrej Bartos Board directorFounder and General Partner at Credo Ventures

Jan Hammer Board directorInvestor at Index Ventures

Investors · 8

GV (Google Ventures)listed by GV (Google Ventures)Mountain View · $250K – $50M

How we know: GV (Google Ventures)'s portfolio page · funding news · corporatecomplianceinsights.com · open dataset · 5k.vc investor directory · Not right? Tell us

Index Ventureslisted by Index VenturesSan Francisco · $540K – $10.8M

How we know: Index Ventures's portfolio page · Wikidata · funding news · corporatecomplianceinsights.com · open dataset · 5k.vc investor directory · Not right? Tell us

Notion Capitallisted by Notion CapitalLondon · $1M – $100M

How we know: Notion Capital's portfolio page · a partner's Signal profile · funding news · corporatecomplianceinsights.com · open dataset · 5k.vc investor directory · Not right? Tell us

Seedcamplisted by SeedcampLondon · $378K – $1.1M

How we know: Seedcamp's portfolio page · Wikidata · funding news · corporatecomplianceinsights.com · the VCSheet dataset · open dataset · 5k.vc investor directory · Not right? Tell us

Credo VenturesreportedPrague · $1M – $5M

How we know: Wikidata · a partner's Signal profile · funding news · corporatecomplianceinsights.com · the VCSheet dataset · open dataset · 5k.vc investor directory · Not right? Tell us

DTCPreportedHamburg

How we know: a partner's Signal profile · funding news · open dataset · 5k.vc investor directory · Not right? Tell us

Experian Venturesreported

How we know: open dataset · 5k.vc investor directory · Not right? Tell us

IDEOreportedPalo Alto

How we know: a partner's Signal profile · Not right? Tell us

Funding

SEC filings, press & company announcements

$37.5M disclosed across 2 of 4 rounds · 2020–2025

$25MSeries BOct 2025 · 3 sources
Source ↗
Undisclosed amountSeries AJun 2023
Credo Ventures, GV, Index Ventures, Notion Capital, Seedcamp
Source ↗
Undisclosed amountseed fundingApr 2020
Source ↗

▶$12.5MraisedJun 2021 · 8 investors · Other Technology

Rule 506(b)

Officers, directors & promoters on the filing

Martin RehakExecutive Officer, Director
Ondrej BartosDirector
Martin GrillDirector
Jan HammerDirector

Offering amount: $12.5M
Amount sold: $12.5M
First sale: Jun 2021
Incorporated: Corporation, Delaware, 2020
Federal exemptions: 06b

Full filing on SEC EDGAR ↗

Source: SEC EDGAR Form D. Amounts as filed; amended filings shown once at their latest values.

Related companies · 4

AuraAura provides AI-powered digital security and protection services for families and individuals across all ages. The platform addresses online safety risks including identity theft and personal security threats in an increasingly connected environment.

WiseWise is a financial platform offering international money transfers, multi-currency accounts, and debit cards with low fees and competitive exchange rates, serving millions of users globally.

InscribeInscribe builds an AI-powered document fraud detection platform for financial institutions, banks, and fintechs to identify and prevent fraudulent applications. The company uses agentic AI agents that are continuously trained to detect fake documents and stay ahead of evolving fraud tactics.

JotformJotform provides an online form builder with integrations that automatically forward new form submissions, file uploads, and payment details to communication tools like Microsoft Teams. It serves teams across industries looking to automate the distribution of submitted form data.

Companies working in the same space as Resistant AI.

In the news

Resistant AI Raises $25 Million in Series B Funding to Empower AI Agents to Fight Fraud and Fincrimefinance.yahoo.com · Oct 2025

Resistant AI announces $16.6 million in Series A funding | Resistant AIresistant.ai · Oct 2021

Frequently asked questions

What does Resistant AI do?: Resistant AI provides AI-powered software that detects fraud in documents — including fake, tampered, or AI-generated files — and adds a fraud and money-laundering detection layer to existing transaction monitoring systems. It serves fraud and compliance analysts in fintech and financial services for use cases such as merchant onboarding, loan underwriting, claims processing, AML, and APP fraud.
Who founded Resistant AI?: Resistant AI was founded by Martin Rehak, Martin Grill, Jan Jusko, Jan Stiborek, Karel Bartoš, Lukáš Machlica in 2020.
Who are Resistant AI's investors?: Resistant AI's investors include GV (Google Ventures), Index Ventures, Notion Capital, Seedcamp, Credo Ventures, DTCP, Experian Ventures, IDEO.
How much funding has Resistant AI raised?: Resistant AI has disclosed $37.5M raised across 2 of its 4 known rounds.
Where is Resistant AI headquartered?: Resistant AI is headquartered in Lewes, US.