O presente trabalho buscou investigar, sob a perspectiva da Teoria da Sinalização, o papel certificador dos fundos de Private Equity e Venture Capital (PE/VC) sobre a qualidade das empresas estreantes na BM&FBovespa (IPOs). Para isso, propôs-se um estudo de evento visando constatar a existência de retornos anormais acumulados (proxy para qualidade dos IPOs) em carteiras de investimentos compostas por ações provenientes dos IPOs realizados na BM&FBovespa, no período de janeiro de 2004 a dezembro de 2007. As hipóteses do trabalho foram verificadas por meio de três procedimentos distintos: teste de médias, método CAPM e regressões CAR. Os resultados dos testes de médias indicaram que os IPOs de empresas investidas por fundos de PE/VC apresentaram desempenhos de curto, médio e longo prazo (até 5 anos) superiores e estatisticamente significantes em relação às empresas não investidas. Além disso, os resultados demonstraram que quanto maior a participação dos fundos de PE/VC na empresa investida, melhor o desempenho de longo prazo. Os resultados do método CAPM indicaram que os retornos observados dos IPOs foram inferiores aos retornos esperados, dado o nível de risco assumido. As regressões CAR verificaram se a presença de fundos de PE/VC explica retornos anormais positivos dos IPOs, após controle de outros fatores. As evidências encontradas sugerem que a presença de fundos de PE/VC nas empresas estreantes na BM&FBovespa possui efeito positivo sobre os retornos anormais acumulados dos IPOs e, quanto maior a participação acionária detida pelo fundo de PE/VC na empresa, no momento imediatamente anterior ao IPO, maiores os retornos anormais acumulados de longo prazo. Em geral, os retornos das amostras analisadas foram inferiores ao desempenho do índice Ibovespa, podendo ser um reflexo da crise financeira mundial, com maior impacto sobre empresas com histórico recente na bolsa (IPOs), em relação às empresas tradicionais (blue chips) que integram o Ibovespa. / This study investigated, under the perspective of Signaling Theory, the certifier role of Private Equity and Venture Capital investments (PE/VC) on the quality of initial public offerings (IPOs) at BM&FBovespa. It was proposed an event study in order to examine the existence of cumulative abnormal returns (proxy for IPOs quality) in portfolios composed of stocks from the IPOs occurred on BM&FBovespa, from January 2004 to December 2007. The hypotheses of this study were verified by three different procedures: test for equality of means, CAPM method and CAR regressions. The tests for equality of means suggested that the companies that received investments of PE/VC, before the IPOs, had statistical significant short, medium and long-term performances (up to 5 years) higher than non-invested companies. Besides that, the results showed that the higher the equity PE/VC held in the companies, before the IPO, better the long-term yield. The CAPM method indicated that the observed returns were lower than the expected returns, given the level of risk assumed. CAR regressions examined whether the presence of PE/VC explains positive abnormal returns of the IPOs, after controlling for other factors. The evidence suggests that the presence of PE/VC has positive effect on the cumulative abnormal returns on the IPOs, and the higher the equity held by the PE/VC in the firm, immediately before the IPO, the greater the long-term cumulative abnormal returns. In general, the returns of the samples were below Ibovespa index, which may be a reflection of the global financial crisis, with greater impact on companies with recent history in the stock market (IPOs), compared to traditional firms (blue chips) that integrate Ibovespa.

民國89年6月我國立法院通過公司買回本公司股份法案，庫藏股制度正式實施，本論文之主要目的在利用市場資料，探析我國上市（櫃）公司買回庫藏股之市場反應及其資訊內涵。本研究以民國89年8月至90年2月間公告買回庫藏股之公司，及依同產業及相似買回比率配對之公司組成研究樣本，首先採事件研究法探討庫藏股法令制定與修正之相關事件日市場反應，以及宣告買回庫藏股之市場反應及其影響因素，並以關聯性研究法實證宣告買回庫藏股市場反應之資訊內涵及買回目的之影響因素。 　　在市場反應議題之主要研究發現為：（1）在庫藏股立法初期、降低操作困難度及解除指撥特別盈餘公積規定等有助於庫藏股制度之推行:投資人有正面顯著之回應；（2）宣告買回樣本之股票累積異常報酬顯著高於未宣告買回之樣本；（3）維護股東權益買回目的者之股票累積異常報酬顯著高於轉讓與員工為目的者；（4）宣告買回比率愈多市場反應愈佳；及 （5）價格回升之公司其實際執行率較低。 　　在資訊內涵議題之主要實證結果顯示，我國宣告買回庫藏股之資訊本質顯著支持企業價值低估假說，公司價值被低估程度愈高，宣告買回庫藏股之市場反應愈大。至於自由現金流量假說、資本結構調整假說及剝奪債權人假說則無法解釋我國宣告買回庫藏股之資訊內涵。在買回庫藏股目的之實證結果顯示，高淨值市價比之公司偏向以維護股東權益為買回目的，而研發活動愈密集之公司傾向以轉讓與員工為買回目的。 / The enactment of Article 28-2 of the Securities and Exchange Act on June 30, 2000 allows firms listed in Taiwan Stock Exchange (TSE) and Over-The-Counter (OTC) to repurchase their owner shares under certain conditions. Based on the use of a control sample design and firms listed in TSE and OTC over the period of August 2000 to February 2001, this research examines the market reaction to various events including: (1) the enactment of the law and amendment of regulations with regard to share buyback, (2) the announcement of repurchase ratio and purpose, and (3) the disclosure of actual buyback ratio. In addition, this study tests hypotheses underlying market reaction around the announcement of share repurchases in the open market. 　　The empirical findings indicate that (1) market reacts favorably to establishment of stock repurchases system, (2) cumulative abnormal return (CAR) for the share buyback announcement sample is found to be greater than that for the control sample, (3) CAR for firms aimed at retaining the interests of equity shareholders as buyback purpose is found to be higher than that for transfer to employees as purpose, (4) the higher the announced buyback ratio, the greater the market reaction, and (5) the actual buyback ratio is less for firms with stock price recovery. 　　This study also finds undervaluation hypothesis explains the market reaction on the announcement date. With respect to the disclosure of share buyback purposes, the analysis indicates that firms with higher book-to-market ratio are more likely to announce protecting shareholders equity as the buyback purpose, whilst firms with higher demand for research & development activities are prone to announce transfer shares to their employees as the buyback purpose.

自1990年代中期，隨著環保、消費者權利、童工…等這些議題被廣泛檢討，越來越多人同意各別公司與整個社會是價值共享且相互依存的，若要達到共存共榮的理想，則公司必定要將社會責任融入其自身追求競爭力和商業策略的核心架構中。企業社會責任(Corporate Social Responsibility)並無公認標準，但一般泛指企業除了追求股東的利益極大化外，還必須兼顧員工、顧客、供應商、合作夥伴、社區團體、環境…等。 道瓊永續性指數(Dow Jones Sustainability Index)為現今資本市場衡量企業社會責任的標竿指數，而企業名列在被大眾認可的永續性指數上，就是企業可以傳達給利益相關者(stakeholders)，表明他們注重企業社會責任的訊號之一。藉由研究企業被涵蓋在聲譽卓著的永續性指數之內是否能為股東創造價值，本論文將探討企業永續發展和企業價值之間的複雜關係。 本研究利用傾向分數配對法(Propensity Score Matching)，降低進入與退出道瓊永續性指數這兩組公司間的異質性，以求得出的結果較不受公司規模、財務槓桿、產業等外在其他因素干擾。將2002至2009年間的樣本數配對後，以道瓊永續性指數作為企業社會責任之代理變數，以累積異常報酬率(Cumulative abnormal return)代表為股東創造之財富，我們追蹤資本市場對於企業進入和退出道瓊永續性指數的反應，來探討股東是否認同公司參與企業社會責任是創造價值之行為。 本研究結果顯示如下: 第一、當企業被加入道瓊永續性指數時，該企業之股東將獲得正向且顯著性的累積異常報酬率，這代表名列著名的的永續性指數是一個股東認可，且企業應追尋的目標。第二、當企業被道瓊永續性指數剔除時，該企業之股東將獲得負向但不顯著的累積異常報酬率。因此我們至少可以推論，從事企業社會責任活動，並不會破壞企業整體之價值。 / Corporate social responsibility (CSR) gradually becomes an important corporate strategy to every company in the worldwide economy. The social performance of a firm can shape the images to key stakeholders, no matter they are employees, suppliers, customers or investors, and influence decision making and relationships with the firm in the later stage. While corporations are busy engaging and enhancing CSR practices, there are few established empirical research on CSR effects and relevance in the capital markets. Hence, my thesis explores the relationship between corporate sustainability and firm value by asking whether membership on a recognized sustainability index is value generating. As stakeholders are urging that firms demonstrate their commitment to sustainability, one signal that companies can send to stakeholders to indicate that they are sustainable is membership on a recognized sustainability index. My research investigates this issue by tracing the market reaction to corporate entries and exits from Dow Jones Sustainability Index, recognized as a CSR benchmark, between 2002 and 2009. Instead of using regression models, I employ a propensity score matching (PSM) pairs design to overcome heterogeneity between different firms. My thesis highlights two main findings: a significant share price rising trend in cumulative abnormal returns (CAR) of the samples under the addition situation, suggesting that inclusion on the Dow Jones Sustainability Index (DJSI) is a goal that firms should pursue. Another is an insignificant negative stock market reaction while firms are removed from the DJSI, and I can draw from the results that, at the very least, adopting CSR doesn’t deteriorate the value of the firms. Our results suggest that the benefits of being included on the DJSI outweigh or equal to the costs associated with applying a membership on DJSI.

Inledning: Ett företag som sponsrar en känd person förknippas starkt med denna. Tidigare forskning har visat att det finns en positiv påverkan på aktiepriset och avkastningen hos företag som tecknar sponsringsavtal med kända personer. Syfte: Syftet med uppsatsen är att med hjälp av eventstudiemetoden undersöka huruvida tio oväntade händelser relaterade till tre idrottare påverkat aktievärdet för Nike Inc. Teori: Den effektiva marknadshypotesen bygger på antagandet att finansiella marknader är effektiva och att all information finns tillgänglig vilket i sin tur exakt återspeglas i priset på en tillgång. Det finns empiriska belägg för att marknaden inte alltid kan sägas vara effektiv som effektiva marknadshypotesen hävdar, något som teoretiskt kallas för anomali. Metod: Denna studie antar ett deduktivt angreppssätt och har en kvantitativ inriktning. Eventstudiemetoden används för att mäta den tänkbara effekt som en oväntad händelse har på företagets värde. Aktieprisförändringen undersöks genom den kumulativa onormala avkastningen (CAR) och hypotesprövningar görs för att nå en slutsats på syftet och problemformulering. Slutsats: Vi har utfört undersökningen i enlighet med eventstudiemetoden och kommit fram till att 9 av 10 oväntade händelser påverkar aktievärdet för Nike Inc. Detta genom att hypotestesta de oväntade händelserna som har visat ett statistiskt samband, positivt eller negativt, mellan den oväntade händelsen och den kumulativa onormala avkastningen (CAR). Vi har även studerat respektive diagram där vi ser en förändring i CAR efter att nyheten kring de oväntade händelserna släppts men att förändringen i de flesta fall inte är så stor. Vi har också funnit att annan information som släppts av Nike under respektive händelseperioder har haft störst påverkan på CAR, särskilt finansiell information.

Syfte: Studiens syfte är att undersöka om Riksbankens tillkännagivanden av reporänteförändringar har en effekt på den svenska aktiemarknaden, samt om det råder skillnader mellan fyra branscher i Stockholmsbörsen. Studien syftar även till att undersöka om det kan urskönjas en skillnad mellan branschernas räntekänslighet. Metod: Undersökningen baseras på en eventstudie med ett estimeringsfönster på 60 dagar före tillkännagivandet av reporänteförändringen, och ett eventfönster på 11 dagar. Urvalet består samtliga reporänteförändringar mellan 2001-2015, och av följande branscher, Finans & Fastighet, Industrivaror, Hälsovård, Teknologi, som är inhämtade från Stockholmsbörsen. Teori: Den teoretiska utgångspunkten i studien är teorin om den effektiva marknadshypotesen och teorier om reporäntan. Det presenteras även teorier om diskonteringsräntans effekt samt pris- och inkomstelasticitet. Finansiell psykologi, som är en invändning mot effektiva marknadshypotesen, redogörs dessutom tillsammans med tidigare forskning som har legat till grund för undersökningen. Slutsats: Studien resulterar i att det inte råder ett entydigt samband mellan Riksbankens tillkännagivanden av reporänteförändringar och den svenska aktiekursen. Resultatet illustrerar att det råder en skillnad mellan de valda branschernas räntekänslighet. Det går inte direkt att fastställa att den svenska marknaden är effektiv. / Purpose: The purpose of this study is to examine if Sweden’s central bank announcements of the federal funds rate have an effect on the Swedish stock market, and whether there are differences between four sectors of the Stockholm Stock Exchange. The study also aims to investigate if there is a difference between the sectors interest rate sensitivity.  Method: The study is based on an event study with an estimation window of 60 days prior the announcement of the federal fund rate, and an event window of 11 days. The sample consists of all the announcement of the federal funds rate between 2001- 2015 and the following sectors, Finance & Real Estate, Industrials, Healthcare, Technology, who are acquired from the Stockholm Stock Exchange. Theory: The theoretical basis in this study is the theory of the efficient market hypothesis and theories about the federal funds rate. An introduction to theories about the discount rate and price and income elasticity is also presented in the study. Financial psychology, which is a statement of opposition against the efficient market hypothesis, is also introduced together with previous research which the examination is based on. Conclusion: The results show that there is no unambiguous correlation between Sweden’s central bank announcements of the federal funds rate and the Swedish stock price. The result illustrate that there is a difference between the selected sectors interest rate sensitivity. In summary, it’s established that the Swedish stock market cannot be seen as an efficient market.

新聞報導在現今社會中為最便利與即時的資訊來源，也是公司與管理階層用來發布年度表現與其他重要消息的管道。本研究想要去找出新聞報導的內容與股票市場的反應之間的關連性，以及財務報表附註提供比新聞報導更多的其他資訊。 本研究以2013年度臺灣90家上市公司為樣本去探討股票市場與新聞報導及財報附註之間的關係。藉由內容分析法的方式去評估新聞報導與財報附註中的正向、負向情緒以及兩者之間的資訊差異以及兩者對股票市場的影響。藉由兩種不同的資訊來源，找出股票市場對於此兩者是否有不同的反應，並從中判斷兩種資訊內容的差異。 本研究發現新聞報導中的正向情緒與股票市場有正向的關連性，然而無法顯著證明在市場反應方面，財報附註能提供比新聞報導更豐富的資訊。 / Financial news articles are the most convenient and timely information in today’s world. Companies and managers can announce current year performance and other concurrent disclosures to investors and stakeholders by financial news articles. This study hopes to find the relationships between financial news articles and the stock market and the information content gap between financial news articles and footnotes to financial statements. This study uses 90 listed companies in TSE of 2013 to test stock market responses to the information content in the financial news articles and footnotes to financial statements. This study implements content-analysis technique, which count words for characterizing as optimistic and negative tone and helps to decide the abundancy of information content elaborated, to find the information content to stock market reactions and compare the information content gap between financial news articles and footnotes to financial statements. This study finds that optimistic sentiment expressed in financial news articles positively relates to the stock price movement. However, this study is unable to reach a conclusion that information disclosed in the footnotes to financial statements is significantly enough to represent the existence of information content gap as compared to financial news articles.

本研究探討台灣會計師公費揭露的市場反應，並以累計異常報酬（CAR）來衡量市場反應。第一階段針對是否揭露會計師公費研究其不同的反應；第二階段再將有揭露會計師公費的公司區分為主動揭露與被動揭露，並探討是否會造成不同的影響；第三階段更進一步將被動揭露的公司依其所符合的法規揭露原因再做細分，特別探討因為非審計公費過高而揭露公費者之市場反應。 研究結果發現，相較於不揭露會計師公費的公司，市場對於有揭露會計師公費資訊的公司會給予較正面的反應；其中，有揭露會計師公費的公司，若屬於主動揭露，市場更是會給予正面的肯定；相反的，有揭露會計師公費的公司，若是因非審計公費達審計公費之四分之一以上者而被動揭露者，市場會對此公司之會計師之獨立性有所懷疑，故給予負面的反應。可見會計師公費的資訊對投資大眾而言確實是一項有意義且重要的資訊。本研究並加入公司治理的相關變數，研究結果發現，若公司之治理程度較差，但「有揭露」會計師公費資訊者，投資大眾會給予正面的反應，此外，相對於被動揭露者，市場對於「主動揭露」之公司會給予更正面的肯定。另一方面，若公司之治理程度較佳，但其揭露原因是屬於非審計公費達審計公費四分之一以上而被動揭露者，市場會對會計師獨立性有所質疑，故對於此種公司仍給予負面的反應。 / This study attempts to examine audit fee disclosure and market reactions. We use Cumulative Abnormal Returns to measure market reactions. First, we analyze whether audit fee disclosure has any market reactions at all. Second, we divide the samples into voluntary disclosure and forced disclosure groups. Third, we make further segmentation from the forced disclosure group according to their disclosure reasons, and specially focus on the disclosure reason of high non-audit fees. We find that market reactions are significantly more positive for firms with audit fee disclosures than for firms without fee disclosure. Market reactions are also significantly better for firms with voluntary disclosure than the forced disclosure group. In contrast, market reactions are significantly lower for firms which disclose audit fees due to high levels of non-audit fees. Our evidence supports that audit fee is a piece of useful and important information to investors. Additionally, we include corporate governance variables in the analysis. We find that when firms’ corporate governance is not good, if they choose to disclose audit fee voluntarily, the market responds with positive reactions. In contrast, if a firm’s corporate governance is quite good but discloses audit fees due to high levels of non-audit fee, the market then reacts with negative returns.

本研究主要探討台灣半導體產業供應鏈上游公司召開法人說明會是否會影響中下游公司之股價。本研究將法人說明會公布之資訊區分為財務資訊及非財務資訊，除探討財務資訊對供應鏈中、下游公司股價是否具影響效果外，亦探討財務及非財務的法人說明會資訊是否具有增額效果。實證結果顯示財務資訊在法人說明會召開前後一天與累積異常報酬呈現顯著正向關係，但非財務資訊卻呈現顯著反向關係，顯示非財務資訊會修正財務資訊所造成之效果。另外，資訊於供應鏈中移轉之距離越長，則移轉效果會越小，但若單純為好消息或壞消息，則移轉效果將增強。 / This research examines the influence of conference call information on the stock price of supply chain partners. The semi-conductor industries in Taiwan were used in this paper to examine the issue. I examined two kinds of information disclosed from conference calls: financial information and non-financial information. I first examined the information contained in conference calls for any effects on supply chain partners. Furthermore, I also examined to see if the non-financial information contains any additional effects to the supply chain partners. The empirical results show that the accumulated abnormal return of the supply chain partners is significantly positive related to the financial information around the conference call date. The accumulated abnormal return of the supply chain partners is significantly negative related to the non-financial information around the conference call date. The results show that both financial and non-financial information would influence the accumulated abnormal return of supply chain partners. The non-financial information contains additional information that revises the influence of the financial information.