Is it permissible to sell shares of a company that deposits its money in a Riba-based bank to a relative who is aware of that, and how can one dispose of these shares?

It is not permissible to buy shares in a company that deposits its money in usurious banks for interest. These shares must be disposed of by returning them to the company and taking back the halal capital and its profits from the permissible return. As for the returns from unlawful investments, they must be disposed of by spending them on charitable causes.