Demutualization is when a company that used to be owned by its members changes so that it is owned by investors instead. This can happen when the members of the company (such as customers, employees, or others) decide that it is a good idea to turn the company into one that is owned by investors. By doing this, the company can make more money and become bigger and more successful, but the members may also get paid for their shares (pieces) of the company.