It is super cheap and great for basic stock tradinglong term investing . If you have at least 10 k Euro you could look into Interactive Brokers as well . Stock lending means DeGiro borrows your stock and lends it to someone else so that person can shortlong it . After the other person is done shorting or longing it that person gives DeGiro back the shares and DeGiro return it to you . Now there is the theoretical chance that the person who borrowed your shares will go bankrupt in the meantime not very likely . Usually DeGiro will reimburse you if that happens . BUT if DeGiro goes bankrupt at the same time you basically lost your shares . That scenario is very unlikely but you need to consider it . Now DeGiro offers a Custody account to forbid Lending . But then you have to pay a fee for dividends . Or you invest in ETFs which are just rarely used for Lending .