When credit shares are used as collateral, the lender finds the highest value in the shares of a company that are traded publicly and without restriction; these shares are easier to sell if the borrower is not able to repay the credit. Lenders can retain physical control of the shares until the borrower returns the loan. At that time, the shares would be returned to the borrower, as they are no longer needed as collateral. This type of financing is also called portfolio credit equity financing. The transfer of shares should include what is called a medallion signature guarantee, which will be concluded when the transfer form is signed. You can get the medallion guarantee from a broker or bank where you have an established relationship.