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This paper tests the relationship between ownership/leadership structures and stock returns for firms listed in Taiwan. A ¡§Governance Index¡¨ is built based on four different aspects of the company¡¦s governance structure: 1.) CEO duality, 2.) Size of the board of directors, 3.) Managements¡¦ shareholdings and 4.) Block shareholders¡¦ holding. This index is used as a proxy measure of the effectiveness of corporate governance mechanism. I show that firms identified by the governance index as under sounding governance outperform those under poor governance. The results indicate that the corporate governance index built in this study is a valid measure in evaluating the effectiveness of corporate governance of firms in Taiwan. I demonstrate one additional application of the governance index constructed in this dissertation by showing that firms (identified by the governance index) with strong corporate governance mechanism effectively constrain the propensity of managers to engage in earnings management and improve the quality of reported earnings. Corporate governance is an effective monitoring device of the quality of financial reporting. Firms with poor governance structure are more likely to avoid reporting small losses by reporting small positive earnings. Furthermore, the magnitude of abnormal accruals is significantly related to governance level. Firms with weak corporate governance structures are more likely to use discretionary accruals to raise reported earnings.

There are more and more enterprises using private placement after private placement is permitted in Taiwan in 2002. It shows that private placement is becoming one choice for public companies to raise capital. The study examines the announce effect of private placement, the one year stock price performance after private placement, variables related to stock price performance after private placement, and earning management in private placement. The results of the study as follows¡G 1.Public enterprises¡¦ private placement did not have a significant announcement effect; it maybe because that most public enterprises with private placement were small enterprises, when they announced private placement did not catch investors attentions. 2.Insiders know more information than general investors, and most private placement rose from insiders. It maybe shows that insiders think enterprises would get better after private placement. So insiders got major portion of private placement maybe the reason of the significant positive of one year stock price performance after private placement. 3.In regression analysis, firm size and stock price performance present significant negative relationship, the ratio of insiders and institutions has significant positive relationship with stock price performance. 4.The study did not find enterprises through earning management lure investors to attend private placement.

ABSTRACT Taitung area was commonly seen as a particularly clean environment. But the air quality has diminished lately similar to that seen in some parts of the populated western area in Taiwan, with ozone (O3) concentration levels rising every year. Because ozone is a byproduct of photochemistry, its accumulation is not only related to the discharge of local pollutants such as nitrogen oxide compounds (NOx), volatile organic compounds (VOC) and the introduction of external pollutants, but also related to the meteorological conditions. This research began with comparing the long-term trends of ozone concentration level and related pollutants in the Taitung area with those found in other survey stations spread in Taiwan. Through factor analysis, the relationship between air pollutants and meteorological parameters are analyzed. Finally, a screening of the events of abnormal ozone concentrations, followed with detailed analysis of the hourly data during these events and the discussion of the possible reasons for the comparatively poor air quality during these events and their correlations with seasons and meteorological conditions. Analysis of the trends in monthly averaged concentration of ozone shows that the annual rate of change (AR) is increasing at all stations under this study, except the Guanyin station being -0.18%. Taitung station has relatively higher levels every spring (March - May) and fall (October ¡V November); the annual rate of change is higher than other east area in Taiwan and the Hengchun station. These seasonal variation (SV) shows a progressively increasing north to south trend, Hengchun station being the highest and Taitung station being the second highest, indicates that concentrations of ozone are influenced by seasonal changes. By using the method of factor analysis to analyze the relation among ozone concentrations, meteorological parameters and pollution parameters, resulted in a direct relationship to the wind speeds over the four seasons. The results show a negative relationship to the atmospheric pressure during summer. The ozone concentrations of the Taitung station show a direct relationship to the Hualian station, which indicates the north to south dispersion relationship. The Analysis of the abnormal event also shows that typhoons may be an important carrier for transporting external pollutants into the area.

Abstract Taiwan's stock market have always been ex-dividend Performance , in essence, to participate in ex-dividend will not increase wealth, but investors are usually regarded as dividends paid by companies operating in the future of the expected. Ex-dividend will to come into notice of investor. We collection from 1999 to 2007, total of nine-year period. The ex-dividend day stock prices analysis in Taiwan 50 index stocks. We use market model of Event Study, and respectively studies by OLS¡BGARCH and SUR model, it's estimated that the abnormal return (AR), this paper to discuss ex-dividend performance of the Taiwan50 index stocks. We to join may cause abnormal return of variables to Panel data regression analysis model, the certification may cause abnormal return of factors.

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.

The purpose of this thesis is to further examine the market dynamics of M&As in the cleantech and renewable energy industry. This study analyzes the abnormal returns of 273 announced and 54 completed buyout acquisitions that took place between 1997 and 2014. The event study method is used to test if cleantech deals experience higher returns than traditional energy and mining deals, if deal completions display similar effects as deal announcements (which is the unique contribution of this thesis) and if homogenous deals experience higher abnormal returns than heterogeneous deals. The outcomes are that the traditional energy and mining sector outperforms the cleantech sectors in homogenous deals. That deal completions effect follows the announcements effect for 11 out of 15 groups and that homogenous deals outperform heterogeneous deals.

Studien undersöker om andelen insiderhandel under återköpsprogram kan motivera signaleringshypotesen som förekommande anledning till att återköpsprogram genomförs. Studien testar först om en abnormal avkastning uppvisas under återköpsprogrammens löptid. Vidare sammankopplas återköp med andelen insiderhandel som genomförs under återköpsprogrammen, vars resultat jämförs med kontrollföretag. Studien sträcker sig över perioden 2000-03-10 – 2012-12-31, där urvalet för studien är de företag som någon gång under perioden är börsnoterade och genomför minst ett återköpsprogram. Studien visar på abnormal avkastning under återköpsprogram och visar även att insiders köper upp högre andelar av utestående aktier under återköpsprogram än i kontrollföretagen. Resultatet indikerar att andelen insiderhandel under återköpsprogram kan motivera signaleringshypotesen. / The paper examines whether patterns of insider transactions during share repurchases can motivate the signaling hypothesis as a reason for repurchases. It examines whether companies that repurchase shares show an abnormal return during the span of the program. It also examines if patterns showing increased insider transactions amongst the companies who actualized share repurchase programs exist, compared to matching firms which haven’t repurchased shares. The study includes share repurchases and insider transactions during the period 03/10/2000-12/31/2012. The study shows an abnormal return for companies repurchasing shares and also concludes that insiders tend to buy a larger share of stocks during share repurchases than in the matching firms. The result of the study indicates that the degree of insider trading during share repurchases may motivate the signaling hypothesis.

I examine the effects of contemporaneous credit rating and watchlist announcements on the over-the-counter U.S. corporate bond market. I find significant negative daily abnormal returns (-2.91%) over a ten-day window associated with a downgrade announcement with negative watch. The effect is particularly strong over the two-day post-event window (-1.90%), while there is some weak evidence of market timing during the four days preceding a downgrade (-0.58%). Abnormal returns following upgrades with positive watch are weaker both in terms of statistical significance and magnitude. I also observe higher abnormal bond returns following downgrades with negative watch around rating-sensitive boundaries. These results suggest that bond abnormal returns could also be driven by regulation constraints, besides the information content of the ratings. Finally, a multivariate cross-sectional analysis on abnormal returns over the two-day window following downgrades shows that the negative watchlist state is a key determinant of bond market's response even when key control variables are included. / <p>Lic.-avh. Stockholm : Handelshögskolan, 2014</p>