Polish National Court Register (abbrev. to KRS in Polish) contains information on companies registered in Poland.
This database provides basic data on limited liability companies, joint stock companies and simple joint stock companies (data on sole proprietorships can be found in CEiDG)
The database is often used to determine the company's representatives (e.g. frequently used in AML procedures)
In KRS, you can also find the financial statements of companies reported at the end of each fiscal year (more information on this integration here)
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