/ɡriːn ʃuː ˈɑːpʃn/ – noun
Definition: Quyền mua thêm cổ phiếu của công ty phát hành trong một giao dịch cổ phần hóa.
A more thorough explanation: (FINANCE) an option to allocate more shares than those included in the public issue and to operate a post-listing price stabilizing mechanism for a period of up to 30 days
Example: The initial public offering (IPO) has a green shoe option attached which allows for the total offering size to be increased by 15 percent.