Cold calling in Belgium: what to check before you dial

Most of what goes wrong on a Belgian cold call happens before anyone picks up. The list is wrong, the language is wrong, or the caller knows nothing about the company that the company does not already know about itself.

Belgian company data is unusually good and mostly free, which makes the third problem the easiest to fix. This page is about the preparation: what to filter out, what the public record tells you before you dial, and which language to open in.

One thing first, because it governs everything else. Belgium's Do Not Call Me list (Bel me niet meer / Ne m'appelez plus, dncm.be) is not a consumer-only register: companies can register their numbers too, so a B2B calling list has to be screened against it. For the statutory basis, the exceptions and the sanctions, see our separate guide to the rules for B2B cold outreach in Europe. Do not assume an existing customer relationship exempts a registered number. The rest of this page assumes you have that screening in place.

Key takeaways

• Screen every Belgian calling list against the Do Not Call Me list, and log the check. Companies can register, not just consumers.

• 997,481 of Belgium's 1,187,819 enterprises have no employees. An unfiltered list is not a calling list.

• Filed accounts, official publications and people moves give you a specific reason to call this company this month.

• Open in Dutch in Flanders and French in Wallonia. Brussels is the switching case, not the other two.

Your list is probably not a calling list

Belgium had 1,187,819 active VAT-registered enterprises at the end of 2024. Of those, 997,481 had no employees at all: sole traders, freelancers, management companies, holding vehicles and dormant entities (Statbel).

If you sell anything that needs a team to justify it, roughly five companies in six on an unfiltered Belgian list cannot buy it. Filtering on employee count before dialling removes most of that 84% from the list, which changes who you reach far more than any rewrite of the script.

For how to build that filter properly, see TAM, SAM and SOM with real numbers.

What the public record tells you before you dial

Five minutes in public sources gives you something specific to open with. Each of these is free to consult.

Which accounts model was filed. Micro, abbreviated or full. It tells you the company's rough scale before you speak to anyone, and it tells you what else you can find. Turnover is optional on the first two, which is why a Belgian company's revenue is so often missing.

Staff count and its direction. Filed in the annual accounts as an annual average, alongside the number of new hires that year. For most B2B products this qualifies better than revenue, because it maps onto seats, licences and users, and a headcount that jumped by a third is a reason to call now rather than next quarter.

Filing behaviour. Late filings, or a run of missed ones, say something about how the business is being run. A company that stops filing altogether can be struck from the register. See finding a Belgian company's revenue.

Official publications. Incorporations, capital changes, appointments and dismissals, changes of registered office and restructurings are all published in the Annexes to the Belgian Official Gazette, each with a date.

Establishment units. A Belgian company can operate many locations, each with its own number, address and activity codes. See establishment units explained. Which one you are calling about matters.

Ownership. Whether the company decides for itself or sits inside a group changes who you should be calling and what a "yes" is even worth.

Turning a record into an opener

The point of the research is one sentence you could not have written about any other company. Take Silverfin, the Ghent accountancy-software company. Everything below is in its public record:

What the record shows: average headcount of 99 FTE in the latest filed year, up from 70 three years earlier · revenue of €19.8M in 2022 rising to €63.3M in 2024, then €47.2M in 2025 · wholly owned by Visma Belgium Holding · its Head of Finance stepped up to VP Finance this July.

An opener built from it: "You've gone from 70 people to around a hundred in three years, and you've just moved your Head of Finance up to VP. I wanted to ask how you're handling X now that you're reporting into Visma."

Every element there is checkable and specific to that business. Compare it with "we help companies like yours", which is true of everyone and therefore evidence of nothing.

Three things make an opener land here:

Name the source plainly. Belgian buyers know they are called from lists. Saying you saw something in the public record is more credible than implying a referral you do not have.

Ask for a specific, short next step. Fifteen minutes next week is easier to agree to than an open-ended meeting.

Do not pretend the call was expected. Acknowledging that it is a cold call costs one sentence and buys the rest of the minute.

This is the part Bizzy is built for: the filed accounts, the group structure, the official publications and the people moves arrive on one company record, so the research step is a read rather than an afternoon.

Language: open correctly, do not switch

Belgium has three official languages, and this is not a nicety. In Flanders and Wallonia you are expected to have opened in the local language rather than switched into it. Brussels is the genuine switching case.

Figures from Statbel, 31 December 2024. These do not sum to the national total of 1,187,819: a further 17,793 enterprises have a registered office abroad, and 16 are unallocated.

Many Belgian professionals will move to English without being asked, particularly in technology and in international companies, but offering the switch lands very differently from needing it.

Two cautions. The registered office is not always where the people are: a company can hold a Brussels seat while its sites and staff sit in Flanders, and the register records the seat, not the locations. And if your team sells in one language only, that table is a real constraint on the size of your market rather than a preference.

What to log

Keep a record of which number was called, when, and that it was screened against the Do Not Call Me list beforehand. The decree does not prescribe a format, but in an enforcement context a process you cannot show is a process you cannot prove.

Record the reason for each call alongside it: the publication, the headcount change, the new site.

Read next: the method around the call, from the list to the script and the follow-up, is in B2B cold calling in Europe; what you may send by email instead is in B2B cold email in the Benelux; and whether the number you have will reach anyone is in the phone data provider benchmark for EMEA.

Frequently asked questions

Is cold calling legal in Belgium?

B2B cold calling is permitted, but the Do Not Call Me list covers companies as well as consumers, so lists must be screened against it before calling. The statutory detail is in our guide to B2B cold outreach rules in Europe.

Does the Do Not Call Me list apply to businesses?

Yes. Companies can register their numbers, so a B2B calling list has to be screened against it. Do not assume an existing customer relationship exempts a registered number.

Which language should I cold call in?

Dutch in Flanders, French in Wallonia, and French in Brussels with an early offer to switch. Many professionals will move to English, but let them offer it.

What should I research before a cold call in Belgium?

The annual-accounts model filed, staff count and its trend, filing behaviour, recent official publications such as appointments or a change of registered office, whether the company sits inside a group, and which establishment unit matters for what you sell.

How many Belgian companies are worth calling?

Of 1,187,819 registered enterprises, 997,481 have no employees. If your product needs a team, filter those out before you build a calling list.

Written by Arthur Cremers at bizzy., which builds European B2B company data from official registers.

Sources

• Statbel: Annual evolution of VAT-registered enterprises (published 16 October 2025, reference date 31 December 2024)

• Statbel be.STAT: Active enterprises by legal form and location of registered office

• Do Not Call Me: dncm.be

• FPS Economy: KBO Public Search

• National Bank of Belgium: Central Balance Sheet Office

• Belgian Official Gazette: Annexes, legal persons search