Mutual fund portfolio managers do not always meet risk-adjusted performance expectations, resulting in loss of capital reserves. Out of 3,612 U.S. based open-ended mutual funds, the risk-adjusted performance of 2,890 (80%) failed to meet or beat the S&P 500 (index fund) performance between the year 2006 to 2016. Grounded in Markowitz's modern portfolio theory, the purpose of this correlational study was to examine the relationship between mutual fund class type, portfolio turnover, fund longevity, management turnover, and annual fund risk-adjusted performance. Archival data were collected from 88 U.S. based equity mutual funds companies. The results of the multiple regression analysis indicated the model as a whole was able to significantly predict annual fund risk-adjusted performance for the 5-year period ending 2016, F (4, 83) = 3.581, p =.043, R2 = .147. In the final model, mutual fund class type and portfolio turnover were statistically significant with mutual fund class type (Ã?= .249, t = 2.302, p = .024) accounting for a higher contribution to the model than portfolio turnover (Ã? = .238, t = 2.312, p = .023). Mutual fund longevity and management turnover did not explain any significant variance in annual fund risk-adjusted performance. Society can benefit from the results of this doctoral study because investors and mutual fund managers could better predict the return based on the information from the study, which may lead to higher families' confidence in the positive contribution of the mutual fund in their portfolio.

本文主要換討SOX之後宣告重編公司之經濟後果。探討如下議題:(1)信用評等是否/如何反應公司的重編資訊;(2)重編內涵與經理人異動之關聯性;(3)經理人異動、信用評等改變以及重編嚴重性三者之關聯性。 / Following the passage of the Sarbanes-Oxley Act of 2002 (SOX), the increasing occurrence of accounting restatements has drawn considerable attention concerning the financial statement quality and adverse consequences of accounting restatements from investors, regulators, auditors and business communities. The primary purpose of this research is to investigate the economic consequences of accounting restatements announced after SOX based on their relations with credit ratings and management turnover. To examine the following research issues of (1) whether and how the credit rating reacts to companies’ restatements, (2) whether restatement characteristics are associated with management turnover, and (3) what the association among management turnover, credit ratings, and restatement severity is, I gather data on 1,838 companies that restated financial statements between 1997 and 2005. In the first part of the study, my results provide empirical evidence consistent with the conjecture that higher severity restatements are more likely to be followed by subsequent unfavorable ratings. Furthermore, rating agencies using accounting-based measures to predict the probability of bankruptcy perform better in assessing ratings in the post-SOX period. Moreover, rating agencies give auditor changes a “fresh-look” after SOX. In the second part of the study, the likelihood of CEO/CFO turnover significantly increases for companies with higher restatements of severity, and a CEO is more likely to be terminated if the company credit rating following restatements is downgraded. The results show that there is no “cop a plea” effect and when restatements are prompted by companies, management turnover appears to be more concerned with the dollar amount of overstatement on income and/or restatements affecting core earnings. In addition, when executives window-dress earnings to portray a more favorable earnings picture, they are more likely to be terminated following subsequent financial restatements. Moreover, results also indicate that after SOX companies seem more likely to blame their auditors for restatements of higher severity and dismiss their auditors afterwards to maybe avoid the replacements of management.

Earnings Management är ett begrepp som syftar till diskretionär redovisning som innebär manipulering av ett företags resultat. Resultatmanipulering kan ske både uppåt och nedåt. När manipulering sker uppåt syftar det till att höja det redovisade resultatet medan manipulering nedåt syftar till att sänka resultatet vilket benämns Big Bath Accounting. Det finns flera forskare som har studerat detta område över tid och som har kommit fram till motstridiga resultat. Vissa forskare menar att Earnings Management och Big Bath Accounting förekommer i stor utsträckning då företag erbjuder bonusprogram som baseras på företagets resultat samt om VD-byte har skett. Andra forskare är av en annan uppfattning. De finner inga statistiska bevis för att Earnings Management och Big Bath Accounting förekommer vid bonusprogram och VD-byten. Vissa av dessa forskare menar även att Earnings Management har avtagit avsevärt eller till och med försvunnit under de senaste åren. Tidigare forskning visar även motstridiga bevis kring användningen av Earnings Management under finanskriser samt bonusprogram. Studiens syfte var således att undersöka faktorer som ligger till grund för Earnings Management och Big Bath Accounting samt incitament som kan påverka ledningen till resultatmanipulering. Resultat från tidigare forskning ligger till grund för studiens teoretiska referensram som mynnade ut i tre hypoteser. Dessa hypoteser testades via multipel regressionsanalys samt en tidsserieanalys. Studiens urval omfattade företag på den svenska marknaden på OMX Stockholmsbörsen Large Cap under åren 2007-2015. Det ursprungliga urvalet omfattades av 747 observationer men då ett visst bortfall ägde rum kvarstod 547 observationer för hypotesprövning ett och två samt 567 observationer för hypotesprövning 3. Resultatet visade på ett statistiskt samband mellan resultatmanipulering och bonusprogram, dock fann vi inget säkerställt samband mellan resultatsänkande periodiseringar och VD-byten. Däremot fann vi stöd för vår tredje alternativhypotes att finanskrisen påverkade Earnings Management under åren 2008-2009. Vår slutsats blev således att de faktorer som ligger till grund för Earnings Management och Big Bath Accounting samt incitament som kan påverka ledningen till resultatmanipulering är bonusprogram och finanskrisen. / Earnings Management is a term aimed at discretionary accounting which involves manipulation of a company's results. Earnings Management can be done either upwards or downwards. When manipulation occurs downwards with the aim of lowering the result, it´s called Big Bath Accounting. There are several researchers who have studied this area over time and have come up with conflicting results. Some researchers believe that Earnings Management and Big Bath Accounting occur to a large extent when companies offer bonus programs based on company performance and whether CEO turnovers has occurred. Other researchers have a different opinion. They do not find any statistical evidence that Earnings Management and Big Bath Accounting occurs when the CEO has changed and companies have bonus programs. Some of these researchers also believe that Earnings Management has diminished significantly or even disappeared in recent years. Previous research also shows conflicting evidence about the use of Earnings Management during financial crises and bonus programs. The purpose of the study was thus to investigate factors that underlie Earnings Management and Big Bath Accounting as well as incentives that may affect the management of a company to apply the theory. Results from previous research form the basis of the theoretical framework of the study, which emerged in three hypotheses. These hypotheses were tested by multiple regression analysis as well as a time series analysis. The study's selection was limited to companies in the Swedish market on the OMX Stockholm Stock Exchange's Large Cap in 20072015. The original sample was comprised of 747 observations, but when a certain loss occurred, 547 observations remained while testing hypothesis one and two and 567 observations remained while testing hypothesis three. The result showed a statistical correlation between performance manipulation and bonus programs, but we found no statistical correlation between profit-decreasing accruals and CEO turnover. On the other hand, we found support for our third alternative hypothesis that the financial crisis affected Earnings Management during 2008-2009. Our conclusion thus became that the factors underlying Earnings Management and Big Bath Accounting as well as incentives that could affect the management of a company to apply the theory are bonus programs and the financial crisis.