企業上市的目的有很多種，我們認為一家公司若是為了替未來的投資機會融資而上市，其長期報酬應顯著較其他非為了投資機會籌資的公司為佳。結果我們發現，在一般認為可作為「籌資」的代理變數─「賣新股」的公司中，這些公司的長期負報酬程度比其他公司更嚴重。在發行股票種類的選擇上，選擇賣老股的公司相較之下有上市前公司獲利較佳、成立時間更久的特性；另一方面，訂較長閉鎖期的公司長期報酬也顯著比較差，這些公司募資的規模則較小、並且通常無創投參與。我們認為有兩種可能：(1) 以股票發行種類為上市目的的代理變數可能不盡理想；(2) 上市的成本超過欲上市籌資的公司經理人所估計。導致這些公司長期負報酬更加的嚴重。

There are many reasons why companies go public. We suppose that companies going public to finance future investment should have better long-term performance than others. As a result, we find strong evidence that the long-term underperformance among primary-share only offering companies which are considered having motivation to finance future investment, are more severe than other companies. In the determinants of choosing which type of shares offering, a company which is old or have better return of equity before listing would have higher probability offering secondary shares. On the other hand, companies setting longer lockup period perform worse. These companies are usually small and have no venture capital backed. We propose two possible explanations to these situations: one is that using type of shares offering as a proxy of motivation of a firm going public is inappropriate; the other is that the cost of a firm going public is beyond a manager’s estimation, resulting the more poor long-term performance of these companies.

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