本論文以個案研究探討台灣企業上市的動機並評估上市後是否達成原本上市的目的。企業經營與發展是有階段性的，面對同樣的產業環境，同一個產業的不同廠商可能採取不同的發展策略。當面臨不同的策略關鍵點時，「追求成長」則是大部分企業首要的策略目標。本論文中個案公司採取上市的方式以取得較低成本的資金、增加知名度以及延攬更多的研發及專業經理人，除了改善較弱的財務結構外，確實增加更多的研發人才加速新產品的開發，改變銷售產品的組合，由賴以生存30年的傳統線性式電源供應器，升級到交換式電源供應器，並成功建立「綠色企業」的形象，達到個案公司上市後的目的。雖然從整體營運數字來看，個案公司營收上市後較上市前成長一倍，整體獲利率並未見提升，但其產品組合卻是大不相同；除此之外，內部控制的建立、人才組成的變化及組織文化的再造與改變，對於個案公司極具正面意義；再者，外部獨立董監事的加入，董事會廣納各方人才的專業與建議，提昇個案公司重要管理決策的廣度及深度，讓整體營運更為宏觀。綜上所述，個案公司確實有透過上市達成財務跟非財務性的目標。

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.

本研究針對企業赴海外上市決策面的三個構面進行探討並以台商為例，首先是探討企業赴海外上市前的動機為何，其次是企業如何選擇海外上市的地點，最後探討這些企業赴海外上市後的效益，也就是企業在海外上市的前、中、後三個不同階段所可能遭遇到的問題進行實務的探討，並以多重個案分析與類型比對的方式，以及一些台商上市現況的統計數字，希望以過去文獻中曾探討的議題來加以研究。 由於過去的研究偏重於台灣、香港、中國大陸三地市場，為了將層面擴大，特別從台商目前赴海外投資最最多的前十名的國家當中，挑出較為重要的六個國家，分別是香港、中國大陸、新加坡、美國、越南、泰國，並研究當地的已上市台商的現況，從當地上市台商所屬產業家數最多者，挑出具代表性的公司，進行個案研究及比較分析。 從個案研究發現，企業赴海外上市的動機，結果是“有利於開拓海外市場”及“易招募優秀人才”的營運面動機較多；企業海外上市地點的選擇，多半因為“市場流動性及規模及本益比”及“資金運用限制”；至於企業赴海外上市後的效益，結果是“提高公司聲譽”及“有助於產品銷售”另外，並發現香港及大陸上市後股東財富增加顯著。 最後，建議企業未來在選擇海外上市地點時，應多方面考量及評估，並非單純僅就幾個因素就決定企業海外的上市地點，應從各利害關係人的角度，去仔細思考在何處上市將是對企業最有利的。 / The research discusses three perspectives on the decision of enterprise go listing abroad and takes Taiwan enterprise as an example. Firstly, to study what are the motives of enterprises go listing abroad. Secondly, to research how enterprises choose listing place abroad. Finally, to discuss the benefits of these enterprises after go listing abroad. That is to say, to discuss the practiced issue that enterprise might encounter with the problems in the three different stages which before, in, after they go listing abroad, and analyze by way of pattern match, and the statistics of present status of some listed Taiwan enterprises with multiple cases, hope to research on the subjects has been discussed in the literature in the past. Because similar researches emphasize three stock markets in Taiwan, Hong Kong and Mainland China in the past, in order to expand the scope, especially from the top ten area invested by Taiwan enterprise at present, choosing six comparatively important area, including Hong Kong, Mainland China, Singapore, U.S.A., Vietnam, Thailand, and study the present situation of the already locally listed Taiwan enterprises, find the most ones from the local listed Taiwan enterprise's affiliated industry, choose the representative company, proceed with case study and comparative analysis. Find from case study, the motives of enterprises go listing abroad are " Contribute to exploit the overseas market " and " It is apt to recruit outstanding talents " the operation motives are more; the choices of enterprises’ overseas listing places, mostly because "Liquidity and scale and p/e ratio of stock market" and " Restriction on funding usage " ; and the benefits after listing abroad as for enterprises are " Improve company's reputation " and " Contribute to the product’s selling " In addition, the research shows shareholder's wealth increased apparently after listed in Hong Kong and Mainland China. Finally, the research suggests enterprises while choosing the listing place abroad in the future, it is considered and evaluated that should be in many aspects, not to determine the overseas listing place of enterprises alone simply rely on some factors, should think carefully in where to go listing is the most favorable to enterprise itself in terms of every interested party.