How many individuals can open a joint account? Updated March 12, 2019 13:43 Saxo Bank accepts joint accounts between two persons only and only between first line family members defined as: spouse, siblings, parents and children. Note: any given person can only be part of one joint account. Related articles How do I open an account? What is the minimum funding amount for a SaxoInvestor account? How do I request support? How do I withdraw money from a Managed Portfolio to my main account?