又称超额配售选择权制度。它是指为了稳定大型公司股票在上市后一段时间的价格,对于一定发行规模以上的公司,允许发行人授权主承销商超额配售一定比例股票(一般不超过发行总量的15%),在股票上市后的一段时间内,当股票价格跌至发行价或 Also known as over-allotment option system. It means that in order to stabilize the price of a large-scale company’s stock after its listing for a certain period of time, the issuer is allowed to authorize the lead underwriter to over-allocate a certain proportion of stock (generally not exceeding 15% of the total amount of the stock) After the listing period, when the stock price falls to the issue price or