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Short selling - lender's motivation
As the other answer said, the person who owns the lent stock does not benefit directly.  They may benefit indirectly in that brokers can use the short lending profits to reduce their fees or in that they have the option to short other stocks at the same terms.   Follow-up question: what prevents the broker lending the shares for a very short time (less than a day), pocketing the interest and returning the lenders their shares without much change in share price (because borrowing period was very short). What prevents them from doing that many times a day ? Lack of market.   Short selling for short periods of time isn't so common as to allow for "many" times a day.  Some day traders may do it occasionally, but I don't know that it would be a reliable business model to supply them.  If there are enough people interested in shorting the stock, they will probably want to hold onto it long enough for the anticipated movement to happen.   There are transaction costs here.  Both fees for trading at all and the extra charges for short sale borrowing and interest.  Most stocks do not move down by large enough amounts "many" times a day.  Their fluctuations are smaller.  If the stock doesn't move enough to cover the transaction fees, then that seller lost money overall.  Over time, sellers like that will stop trading, as they will lose all their money.   All that said, there are no legal blocks to loaning the stock out many times, just practical ones.  If a stock was varying wildly for some bizarre reason, it could happen.