Overview
B4 Limits develops and manufactures the Poland-made Defender line of FPGA-based reactive RF jamming systems for counter-UAS, correctional facilities, and telecommunications, covering 20–8000 MHz with reaction times from 18 μs. The systems provide software-defined profiles for power, algorithms, and jamming modes, with ranges of up to 3 km omnidirectionally or 10 km using directional antennas, plus integration through REST, NATO SAPIENT, and TAK.
Financials
Revenue history (in k)
Filing timeliness
2 of 6 financial statements were filed late (the longest delay 222 days for 2021).
- 202510/07/2026
- 202401/07/2025
- 202322/07/2024
- 202229/06/2023
- 202122/02/2023
- 202011/10/2021
Data and insights are generated automatically from financial statements – they may contain errors and are neither a credit assessment nor business advice.
Statistics
How the company ranks by revenue within its industry, region and across Poland in 2025.
Results vs industry
Industry
Offer
- RF jamming systems
- Counter-drone systems
- Portable jammers
- Modular jammers
- Control software
- Security system integration
Authorized Representatives
Manner of representation
Each member of the management board independently.
Ownership
| Owner | Shares | Share value | Stake |
|---|---|---|---|
Sebastian Piotr Szachowiczage 54 | 910 | $24,581.31 | 91% |
Others | 90 | $2,431.12 | 9% |
Beneficial owners
| Person | Rights |
|---|---|
Bank accounts
Registered as a VAT taxpayer on 2019-07-19.
86 1600 1462 1854 1348 1000 0008- 27 1600 1462 1854 1348 1000 0003
- 81 1600 1462 1854 1348 1000 0001
Debt
No entries in the National Debtors Register (KRZ).
Public aid
34 public aid cases recorded, with a total value of $1,083,337.
| Grant date | Purpose | Gross amount | Granting body | |
|---|---|---|---|---|
| Jun 2, 2026 | Aid in the form of wage subsidies for employing workers with disabilities | $155$155 | Prezes Zarządu Państwowego Funduszu Rehabilitacji Osób Niepełnosprawnych | |
| May 7, 2026 | Aid in the form of wage subsidies for employing workers with disabilities | $155$155 | Prezes Zarządu Państwowego Funduszu Rehabilitacji Osób Niepełnosprawnych | |
| Apr 9, 2026 | Aid in the form of wage subsidies for employing workers with disabilities | $155$155 | Prezes Zarządu Państwowego Funduszu Rehabilitacji Osób Niepełnosprawnych |
European Funds
| Start | Project | EU co-financing | Programme | |
|---|---|---|---|---|
| 2022-01-01 | Portable broadband device for jamming radiocommunication signals with a digital signal processing path based on high-speed RF converter circuits and an FPGA. | $865.7K$865,724 | Operational Programme Smart Growth |
Regulatory authorisations
| Authority | Type | Status | |
|---|---|---|---|
 BDO | BDO register entry | Active |
Competitors
| Name | Revenue | Website | ||
|---|---|---|---|---|
| Avionix Engineeringsp. z o.o. | $1,251,766.12 | avionix.pl | ||
| Elvys Polskasp. z o.o. | $1,246,354.05 | elvys.pl | ||
| Rectanglesp. z o.o. | $1,204,455.88 | rectangle.com.pl | ||
| ABC Tracksp. z o.o. | $1,176,926.40 | abc-track.pl | ||
| Indra SistemasBranch (foreign co.) | $895,829.91 | indracompany.com | ||
| Rfid.Zonesp. z o.o. | $326,642.20 | rfid.zone | ||
| EFABP.S.A. | $250,302.78 | efab.pl | ||
| Xy-Devicessp. z o.o. | $241,085.22 | xydevices.pl | ||
| Smartdronessp. z o.o. | $220,508.08 | smartdrones.ai | ||
| Core Dfsp. z o.o. | $196,498.83 | coreflow.com |
Change history
| Date | Event | |
|---|---|---|
| 2025-02-10 | Address change (Ul. Lipowa 30/104, 15-427, Białystok → Ul. Świętego Rocha 10/2, 15-879, Białystok) | |
| 2020-04-23 | Address change (Ul. Lipowa 30, 15-427, Białystok → Ul. Lipowa 30/104, 15-427, Białystok) | |
| 2020-04-23 | PKD change (Removed: 63.99.Z, 77.40.Z, 96.09.Z; Added: 46.51.Z, 46.52.Z, 46.90.Z) | |
| 2019-06-27 | Entered in the register |
FAQ
Last updated: 2026-07-16