The borrower puts up more than 100% the value in collateral to borrow stock and they are also insured. The risk of stock lending is very low. Anything you do

The borrower puts up more than 100% the value in collateral to borrow stock and they are also insured. The risk of stock lending is very low. Anything you do with a securities broker, the risk of losing something due to the other side of the trade going bankrupt, etc is very very low. Your broker has to have collateral to support closing your position, likewise for the other side of the transaction. A broker ends up holding the bag if something goes wrong and it’s their fault for allowing a customer to open a position they couldn’t close.