For regulatory reasons, our partner Swan can unfortunately not onboard companies who are owned by a US citizen. For more details, please refer to Swan's eligibility requirements: Am I eligible to open an account?.
If you are no longer a US citizen, we can however proceed with the account opening. To verify this, you must provide a document confirming their renunciation of US citizenship: the Certificate of Loss of Nationality of the United States (CLN).
For more information, you can refer to the following resources: