Keytrade Bank is the Belgian branch of Arkéa Direct Bank SA, a French bank, and offers online banking and investing services in Belgium. Its range includes current, savings and trading accounts, debit and credit cards, a mobile app, brokerage for listed shares, bonds and funds, and online home loans. Customers use these services through web and mobile channels, so no software is installed or run by the customer.
The sovereignty question for this provider is ownership. The legal entity is the Belgian branch of Arkéa Direct Bank SA, which belongs to Crédit Mutuel Arkéa, a French cooperative banking group based near Brest. Keytrade Bank was part of the Belgian Crelan group until 2016 and has since been part of the French group. The pages consulted describe neither a hosting location nor a data-protection policy, so the location of Belgian clients' data should be confirmed directly with the bank. For a European organisation the owner is an EU group, so the main questions are the branch structure and where client data is held.