What happens when I want to sell my shares that are currently lent to a short seller?

External question — Personal Finance Stack Exchange Author: Flux Original post: https://money.stackexchange.com/questions/127099 License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/ Adaptation: HTML converted to plain text; contact email addresses removed. Suppose I own 100 shares of a company in a margin account. Suppose the brokerage firm lends my shares to a short seller. Questions: Can I sell my 100 shares while they are still on loan to the short seller? If yes, what happens to the short seller's position when I sell my 100 shares? Is the short seller's position closed by the stock broker?