Overview
Dertum is a glassworks in Bydgoszcz specializing in glass and mirror processing. It makes mirrors, shower enclosures, glass panels, railings, doors, glass partitions and canopies, with measuring, installation and transport services. It serves customers across the Kuyavian-Pomeranian Voivodeship and ships products throughout Poland.
- Monday–Friday
- 7:00–15:00
Financials
Revenue history (in k)
Filing timeliness
Financial statements were filed on time, on average 76 days early.
- 202514/05/2026
- 202416/04/2025
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
- Mirrors
- Glass panels
- Shower enclosures
- Glass partitions
- Glass railings
- Glass canopies
Website technology
- Website
- WordPress
Public procurement
Dertum is the contractor in one public sector contract, worth USD 183.68.
| Signed on | Subject | Amount | Public buyer | |
|---|---|---|---|---|
| Aug 6, 2026 | Replacement of the mirror in the fitness room at Akademickie Centrum Sportu | $183.68 | Politechnika Bydgoska Im. Jana i Jędrzeja Śniadeckich |
Authorized Representatives
Manner of representation
Each member of the management board is authorized to make declarations on behalf of the company independently.
Ownership
| Owner | Shares | Share value | Stake |
|---|---|---|---|
Michał Aleksanderage 35 | 49 | $5,294.44 | 49% |
Marta Tumiłowicz Aleksanderage 35 | 51 | $5,510.53 | 51% |
Marta Tumiłowicz Aleksander and Michał Aleksander hold a combined 100% – the ownership structure indicates family control.
Beneficial owners
| Person | Rights |
|---|---|
Debt
No entries in the National Debtors Register (KRZ).
Public aid
No public aid cases recorded in the last 10 years.
Regulatory authorisations
| Authority | Type | Status | |
|---|---|---|---|
 BDO | BDO register entry | Active |
Competitors
| Name | Revenue | Website | ||
|---|---|---|---|---|
| S-Glassp. z o.o. | $1,056,126.21 | s-glas.pl | ||
| Alhen Artszkłosp. z o.o. | $1,007,044.59 | alhen.com.pl | ||
| Ramglasssp. z o.o. | $776,112.37 | ramglass.pl | ||
| Glass-Tarsp. z o.o. | $751,221.99 | glass-tar.pl | ||
| ACE Glass M. Woźniaksp. z o.o. | $709,081.11 | aceglass.pl | ||
| Szkło-Techsp. z o.o. | $704,845.68 | szklotechkielce.pl | ||
| Glass Colorsp. z o.o. | $557,580.12 | glasscolor.pl | ||
| Zahartowanisp. z o.o. | $373,151.24 | zahartowani.pl | ||
| Glass Decoratorsp. z o.o. | $362,436.10 | szyby-dekoracyjne.pl | ||
| Irwarsp. z o.o. | $206,831.53 | irwar.pl |
FAQ
Last updated: 2026-07-14