how do I provide my claims history to a new insurer

Provide claims history as a factual overview, not as an explanation

A new insurer usually wants to know: how many claims in the last three to five years, what the cause was, what the amounts paid out were, and whether a claim is still outstanding. The most useful document is the claims history overview from your current or previous insurer — often called a "discharge statement" or "insurance history". This shows the claims per policy year, including the amount paid out. If you don't have that overview, your own statement is usually sufficient, but the new insurer may ask for supporting evidence before the policy definitively takes effect.

If you are unsure whether something counts as a claim — for example a notification that was rejected, or a claim that was fully recovered from a third party — it is more precise to mention it separately than to leave it out. Insurers sometimes compare such statements with their own registration systems (for example in fraud or risk databases), and an incomplete statement later is harder to explain than a complete statement now. This topic relates to how an insurer views the risk of your business more broadly; this partially overlaps with the question what do I fill in if an insurer asks about our financial health. Also note that a bank often requests different risk indicators than an insurer, even if the question seems superficially the same — see why the bank asks completely different questions than the insurer.

Why this does not follow from the sources provided

For claims history there is no statutory retention or reporting obligation in the sources available here: the Trade Register Act 2007 regulates which basic data of an business are recorded, the Act on the Prevention of Money Laundering and the Financing of Terrorism regulates customer due diligence at financial institutions, and the CSRD Directive regulates sustainability reporting. None of these three says anything about reporting claims history to an insurer. What an insurer asks about this follows from that insurer's own acceptance conditions, not from a legal requirement that is substantiated here — therefore fill in what you can support with evidence, and leave the rest to the question as it is presented in your customer's portal.