The 7 Best B2B Data Providers in Poland: Split Register, Crowd-Sourced Debt (2026)

Two things make Poland distinctive. First, there is no single register: companies sit in the court-run KRS, sole traders in the separate CEIDG, and everyone gets a statistical REGON number, with financial statements filed free in their own repository. The raw data is genuinely open, just scattered across dozens of government sources that are hard to consume at scale.

Second, and more unusual, Poland crowd-sources bad debt. Statutory economic-information bureaus, the BIG registers, let any business list a debtor and screen counterparties, so payment-default data is contributed by the market itself. That is why the debtor registers, KRD, BIG InfoMonitor and ERIF, sit at the centre of Polish B2B risk-checking in a way they do not in most of Europe.

This guide ranks {count} providers on merit. We sell Polish business data ourselves, so our pitch sits in a marked box rather than at number one.

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1. BIG InfoMonitor: the debtor register with bank reach

The debtor register wired into the banking-credit bureau, giving it the widest market view.

BIG InfoMonitor is a statutory economic-information bureau and part of the bank-owned BIK group, which is what sets it apart: it links crowd-sourced debtor data with BIK's bank-credit information, giving it the broadest reach across lenders, telecoms and utilities. For screening whether a Polish counterparty is a bad payer, with the widest coverage, it is the natural first stop.

Warsaw, Poland · Subscription and per-report · Built on: BIG debtor data, BIK credit data, KRS

3. KRD: the largest debtor register

The biggest and best-known Polish debtor register, and a lever as much as a lookup.

Running since 2003 and part of the Polish Kaczmarski Group, KRD is the largest of the debtor registers. A business can be listed for a debt as low as a few hundred zloty, which makes KRD both a screening tool and a way to pressure a debtor into paying by threatening to list them. That dual role, register and lever, is a very Polish feature of the market.

Wrocław, Poland · Subscription and per-report · Built on: BIG debtor data, KRS, Public sources

4. Dun & Bradstreet Poland: the incumbent

The deepest legacy Polish company file, and the route to global D&B linkage.

Formerly Bisnode Polska, rebranded after Dun & Bradstreet completed the Bisnode acquisition in January 2021, this is the incumbent global business-data network in Poland: the deepest legacy Polish company file, risk scores, financials and the D-U-N-S number with global entity linkage. It is the multinational-grade choice when Poland is part of a wider risk or master-data picture.

Warsaw, Poland · Quote only · Built on: KRS, RDF financial statements, D&B network

5. ERIF: the third register

The third debtor register, now CRIF-owned, and unusually strong on positive payment history.

ERIF is the third of the statutory debtor registers, acquired by the Italian CRIF group in early 2023. Alongside negative default data it carries a notable share of positive payment history, which makes it useful for confirming that a counterparty pays reliably, not just for flagging that it does not. As a third source, it is the natural complement to KRD and BIG InfoMonitor.

Warsaw, Poland · Subscription and per-report · Built on: BIG debtor data, Positive payment data, KRS

6. Transparent Data: the API platform

The strongest local API option, consolidating Poland's scattered public sources into one feed.

Founded in 2013, Transparent Data solves the fragmentation problem directly: it consolidates Polish company data from 50-plus government sources, KRS, CEIDG, REGON, the gazette, the VAT white list and more, plus financial statements, and delivers it through APIs and its Prześwietl.pl portal. For programmatic Polish company data, KYB and monitoring at scale, it is the leading homegrown platform.

Poland · API packages, quoted · Built on: KRS, CEIDG, REGON, 50+ government sources

7. Rejestr.io: the transparency tool

An NGO-run lookup that is free-to-cheap and unusually good at mapping ownership and connections.

Run by the transparency foundation Fundacja Moje Państwo, Rejestr.io turns KRS data into company, foundation and association profiles with ownership structures and shareholder links, on a free tier plus published premium and API plans. Because it is civic-tech and KRS-centric, its ownership and connection mapping is a strength, while its coverage of sole traders and financials is thinner than the commercial platforms. Rare in this market for publishing its prices.

Poland · Free tier, published premium · Built on: KRS, Public sources

How Poland's data market took shape

Poland built free public registers and a unique debtor-register system, and foreign groups have been buying in:

So who is still actually Polish?

Poland kept its debtor registers and data platforms largely local, with foreign groups buying selectively:

Open data, scattered across the state

Poland's raw company data is genuinely free, but it is spread across dozens of government sources. The court register, KRS, is free to search and covers companies; sole traders sit in the separate CEIDG; everyone has a statistical REGON number; and filed financial statements are free in the RDF repository, downloadable with just a KRS number. The catch is consolidation: pulling all of this together, at scale and by API, is the job the commercial platforms do.

On top of that sits the debtor-register system, which is where the real Polish specialism lies. Because businesses contribute default data to the BIG registers, payment behaviour is crowd-sourced rather than modelled, which is why those registers are central to risk-checking here. Check the free sources here:

• KRS : The National Court Register: free search of Polish companies and legal entities.
• CEIDG : The free register of sole traders and the self-employed, who do not file public accounts.
• Financial statements (RDF) : The free repository of filed financial statements, searchable by KRS number, no account needed.

Four questions before you sign anything

1. Is your real question about unpaid debt? If you want to know whether a Polish business pays, the debtor registers are where that data lives, contributed by the market. KRD and BIG InfoMonitor lead; ERIF adds positive history. A general company file will not replace them.

2. Do you need the sources consolidated? The raw data is free but scattered across KRS, CEIDG, REGON and more. If you need it unified at scale or by API, a platform like Transparent Data is doing the hard part; doing it yourself is a real project.

3. Companies only, or sole traders too? KRS covers companies and holds financials; CEIDG covers sole traders and holds none. If your market is the self-employed, expect no filed accounts and favour providers that cover CEIDG well.

4. Do you need global linkage? For Poland inside a worldwide risk or master-data picture, D&B's D-U-N-S linkage fits. For purely domestic screening, the registers and local platforms are cheaper and often deeper.

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