As a Sole Representative of an overseas business you are not permitted by the Immigration Rules to have a own or have a majority stake in the overseas business you intend to represent in the UK, irrespective of whether that ownership or control is by means of shareholding, partnership agreement, sole proprietorship, or any other arrangement.
As Sole Representative you may have a stake in the overseas business, but you will not qualify for a Sole Representative Visa if you own more than 50% of the available shares or own 50% of the voting rights in the overseas business at the date of your application.
Sole Representative Applicants are further required to demonstrate that they are not party to any arrangement in relation to the overseas business that effectively enables them to hold majority ownership or control of that business without owning more than 50% of the business.
Additionally, A Sole Representative’s partner or spouse who owns a majority stake in or controls the overseas business will not be eligible to apply for leave to enter the UK as a dependent family member of a Sole Representative Migrant.