Firlej Kastory
VC Fund
Warsaw, Poland
Firlej Kastory is a private investment firm focused on investments in global technology companies. We prefer to invest in B2B SaaS solutions in Europe. Our sectors of interest are Enterprise AI, RegTech & Risk Governance, Finance, E-commerce, Health and Energy.
- Total investments:
- 3
- Last investment:
- Lead investor:
- 0%
Last updated:
For AI agents: llms.txt
Industries Firlej Kastory invests in
Stages Firlej Kastory invests in
Countries Firlej Kastory invests in
Round sizes
Contacts
| Name | Phone | Socials | |
|---|---|---|---|
Round size
- Seed
- $587k–$4.6M
Investment Focus
Industry
- Artificial Intelligence 3 (100%)
- Software 2 (67%)
- Cyber Security 2 (67%)
- SaaS 1 (33%)
- FinTech 1 (33%)
Stage
- Seed 2 (67%)
- Series A 1 (33%)
Country
- Poland 2 (67%)
- Estonia 1 (33%)
Team
| Name | Title | Investments | Links | |
|---|---|---|---|---|
Mikolaj Firlej
Managing Partner
|
Managing Partner | Total investments: 10 | Find email | |
Stanislaw Kastory
Partner and General Counsel
|
Partner and General Counsel | Total investments: 1 | Find email |
Investments
| Company | Description | Round | Links |
|---|---|---|---|
| Nethone offers a risk detection product designed to protect the entire user journey, from onboarding to post-payment, at the same time helping merchants to holistically understand their end-users (good and bad). With the Know Your User (KYU) profiling technology and AI-powered tools, Nethone blocks all risky users without friction to the good onesby exhaustively screening every single one. The fraud detection software monitors and blocks over 100 types of fraudster tactics on websites and mobile apps, which are processed into actionable recommendations in real time. Thanks to a modularized approach, Nethone offers end-to-end protection, and addresses multiple types of fraud at every step of the user journey, from account takeovers, bot attacks, promo & policy abuse, friendly fraud to money laundering schemes. Founded in 2016 by data scientists, developers, and security experts within Daftcode, Nethone is successfully cooperating with global ecommerce, digital goods, and financial industries. Since 2022, Nethone has been part of Mangopay Group, a pan-European provider of platform payment & wallet infrastructure. In 2023, it was recognised as one of Europe's fastest-growing companies by The Financial Times and Statista. It was also the highest-ranked Polish company in the Fintech category.The Nethone proprietary Profiler enriches the understanding of every single user with over 5000 attributes, which are processed into recommendations in real-time using a decision engine. While staying focused on the singularity of the client’s business, Nethone can help to lower clients’ rejection rates, costs of manual review, and risk of fraud, without touching the UX of the service--automatically and in real‑time. Founded in 2016 by a group of security experts, financial business executives and data scientists within Daftcode - a Poland-based venture builder, is today successfully cooperating with 50+ global e-commerce, digital goods, and financial industries. In 2021 Nethone was named Poland’s fastest-growing company in the ‘Deloitte Technology Fast 50 Central Europe’. | $6.7M / Series A / Jul 15, 2021 | ||
| Molecule One is an information technology based bio company. Their m1 platform spans the preclinical pipeline to maximize chemistry. Molecule One integrates artificial intelligence into a suite of tools to assist bench chemists, data scientists, and computational chemists. | $4.6M / Seed / Jun 01, 2021 | ||
| Blackwall is an AI-enabled security and web infrastructure company focused on protecting web ecosystems from automated threats. Specializing in bot mitigation and web security, Blackwall provides solutions for hosting service providers (HSPs), managed service providers (MSPs), and eCommerce platforms. By securing these providers, Blackwallsafeguards thousands to hundreds of thousands of websites, indirectly protecting the small and medium-sized businesses (SMBs) that rely on these services for their online presence. | $587.2K / Seed / Oct 13, 2020 |
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FAQ
What does Firlej Kastory invest in?
Firlej Kastory invests primarily in Artificial Intelligence, Software and Cyber Security startups, most often at Seed and Series A stage. Most of the 3 investments tracked by Shizune back companies in Poland. The Investment Focus section breaks down every industry, stage and country in the portfolio.
What is Firlej Kastory's check size?
Firlej Kastory typically joins rounds of $587k–$4.6M at Seed. These ranges are 10th–90th percentile round sizes calculated from confirmed public funding rounds, so they are a realistic guide to the rounds Firlej Kastory participates in.
How do I contact Firlej Kastory?
Public channels for Firlej Kastory include LinkedIn and the website linked on this profile. For a verified work email and phone number, create a free Shizune account — contact data is searched across 20+ sources and validated before delivery, so your outreach lands in the right inbox.
Who are the partners at Firlej Kastory?
The team at Firlej Kastory includes Mikolaj Firlej (Managing Partner) and Stanislaw Kastory (Partner and General Counsel). The Team section lists each member with their title, investment count and links.
Is Shizune's investor data accurate?
Yes — every stat on this profile is calculated from confirmed public funding rounds monitored across hundreds of sources since 2020. This profile was last refreshed in Sep 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.
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