It is the Holder of a domain name, i.e. the registrant, that has the right to transfer their domain to a new holder. The registrar must have routines to ensure that the person who requests the change of holder (transfer) is entitled to do so. For a company in bankruptcy, the trustee normally has this right, and the contact persons that were specified probably no longer have the right to act on behalf of the company.
The documents linked to below are guidance for Registrars of the top-level domains .se and .nu, and for their registrants concerning change of domain name holders in the event of bankruptcy, merger, liquidation, or death of the domain holder, i.e. the domain holder does no longer exist.
