中文摘要：

在我国,企业集团经常选择同一个会计师事务所审计集团内的多家上市公司。文章以企业集团为集团内IPO公司选择同一个会计师事务所为出发点,使用2003-2012年非金融类IPO公司为样本,来研究IPO统一审计对IPO抑价以及IPO后业绩变化的影响。研究发现,企业集团为集团内IPO公司选择同一个会计师事务所不能在一级市场起到信息作用,反而会显著提高IPO抑价,IPO后业绩＂变脸＂也会更大。在区分大小规模事务所样本进行进一步比较后,文章发现小规模事务所的这一作用更加显著。

英文摘要：

In China,business groups usually choose the same auditor to be in charge of multiple listed firms within the group.Based on this starting point,this paper makes use of non-financial IPO firms from 2003-2012 to test whether choosing the same auditor in the group as the IPO auditor affects IPO underpricing and post-IPO underperformance. This paper revealed that choosing the same accounting firm to audit for all companies within a group cannot play an information role in the primary market and it will obviously increase the underpricing with the post-IPO operating performance declining later. After comparing and analysis among accounting firms of different sizes,the result shows that small accounting firms can better interpret this function.