It is a future projected value of a company. You can not realize it. If you start selling stocks, they will drop at a rapid pace. The entire stock market is in

It is a future projected value of a company. You can not realize it. If you start selling stocks, they will drop at a rapid pace. The entire stock market is in a way projection of all future money the stocks will potentially make for a long time. This is not liquid cash that can be injected for any other purpose.