A governança corporativa visa aumentar a probabilidade dos fornecedores de recursos garantirem para si o retorno sobre seu investimento, por meio de um conjunto de mecanismos no qual se inclui o Conselho de Administração. O tema possui importância crescente, por ser bem difundida a hipótese de que a estrutura de governança afeta o valor da empresa. A questão é descobrir se existe uma estrutura de governança corporativa "melhor" ou "ideal". Vários códigos de governança foram elaborados com este intuito. No Brasil, destacam-se os códigos do Instituto Brasileiro de Governança Corporativa (IBGC) e da Comissão de Valores Mobiliários (CVM). Esta dissertação investiga se a estrutura de governança corporativa foi relevante para as companhias abertas brasileiras de 1998 a 2000 e se as companhias adequadas às recomendações do IBGC e da CVM alcançaram maior valor de mercado ou melhor desempenho. Três variáveis de governança foram consideradas: separação dos cargos de diretor executivo e presidente do conselho (DE), tamanho do conselho (TOT) e independência do conselho (INDEP). Utilizou-se uma regressão múltipla do tipo seção transversal entre as variáveis dependentes de valor e desempenho e as variáveis independentes de governança corporativa. A variável diretor executivo como presidente do conselho (DE) apresentou os resultados mais importantes, com forte evidência de que, em média, as empresas que têm pessoas distintas ocupando os cargos de diretor executivo e presidente do conselho são mais valorizadas pelo mercado. A variável tamanho do conselho (TOT) apresentou uma relação certamente não linear, sugerindo que as empresas com um número intermediário de conselheiros alcançam melhor desempenho. A variável independência do conselho (INDEP) não apresentou relação significativa contra as variáveis de valor e desempenho. / Corporate governance seeks to increase the probability that suppliers of financial resources will assure themselves the return on their investment through a set of mechanisms including the Board of Directors. The subject has growing importance, because it is well spread the hypothesis that corporate governance affects firm value. The question is to find out if there is a "better" or "ideal" corporate governance structure for the firm. Several corporate governance codes were prepared with this purpose. In Brazil, we highlight the IBGC (Brazilian Institute of Corporate Governance) and the CVM (Brazilian Securities and Exchange Commission) codes. This dissertation investigates if the corporate governance structure was important to Brazilian listed companies from 1998 to 2000 and if the companies more adjusted to the IBGC and CVM recommendations achieved higher market value or superior performance. Three governance variables were considered: the separation of chief executive officer and chairman positions (DE), board size (TOT), and board independence (INDEP). The multiple regression method with cross sectional data was applied between firm value and performance dependent variables and corporate governance independent variables. The variable chief executive officer as chairman (DE) has showed the most important results, with strong evidence that, on average, firms with different people in charge of the chief executive officer and chairman positions have higher market value than the others. The variable board size (TOT) has showed a clear non linear relation, suggesting that firms with an intermediate number of directors achieve superior performance. The variable independence of the board (INDEP) has not showed a significant relation against the variables of value and performance.

Syfte: Corporate Social Responsibility (CSR) är idag ett  globalt allmänt känt begrepp och Svenska företag anses ligga i framkant med sitt ansvarastagande. Huvudsyftet med uppsatsen är att analysera huruvida ett stort engagemang inom CSR-frågor ger Svenska företag en förändring i företagsvärde och om det påverkar deras lönsamhet. Ett approximativt Tobins Q används som mått på företagsvärde och Return On Assets (ROA) används som mått på lönsamhet.   Metod: En kvantitativ deduktiv metod där undersökning av sekundärdata ska mynna ut i en prövning om huruvida det går att påvisa ett samband mellan CSR och företagsvärde och/eller lönsamhet. Sekundärdata inhämtas ifrån Folksams Index för ansvarsfullt företagande 2009 samt företagens årsredovisningar från 2011. Historiska aktiepriser har hämtats ifrån Nasdaq OMX Nordics hemsida. Sedan inhämtade data har undersökts väljs en passande analysmetod, vilket i detta fall blev multipel tvärsnittsregression.   Resultat och slutsats: Studien visar att det finns en statistiskt signifikant korrelation mellan ett högt CSR och approximativt Tobins Q där ett ökat CSR-arbete ger minskat företagsvärde. Vidare visar studien även en statistiskt signifikant positiv korrelation mellan CSR och ROA, där modellen dock uppvisar brister. En generell förklaring till detta är att det inte finns någon global begreppsbenämning av CSR, vilket försvårar mättningar.  Utöver detta upptäcktes svårigheter i att bestämma ett svenskt bolags marknadsvärde eftersom företag generellt inte har alla sina aktier på börsen och A-aktier är svårvärderade då de sällan omsätts.   Förslag till fortsatt forskning: Ett förslag är en tvärsnittsregression, liknande denna studie där olika sätt att definiera ROA och storlek jämförs. Det vore även intressant att genom en tidsserieanalys undersöka när i tiden CSR-arbetet ger utslag på Tobins Q samt ROA.   Uppsatsens bidrag: Identifiera påverkande faktorer för att bidra till en framtida benchmark av ekonometriska modeller vid mätningar av CSR. / Aim: Corporate Social Responsibility (CSR) is a widely known global concept and Swedish enterprises are considered to be cutting edge when it comes to taking responsibility. The main objective is to analyze if a large involvement in CSR gives Swedish companies a change in company value, and if it affects their profitability. An approximate Tobin’s Q is used to measure firm value and Return On Assets (ROA) is used to measure profitability.   Method: A quantitative deductive method where investigation of secondary data will lead to an examination whether it is possible to demonstrate a relationship between CSR and firm value and/or profitability. Our secondary data is retrieved from Folksam Index for corporate responsibility 2009 and the corporate annual reports from 2011. Historical stock prices were collected from Nasdaq OMX Nordic webpage. After examination of the data a suitable analysis method will be chosen, which in this case resulted in multiple regression analysis.   Result and Conclusions: The study shows that there is a statistically significant correlation between a high CSR and the approximate Tobin’s Q where increased CSR returns a reduced value of the firm. The study also shows a statistically significant positive correlation between CSR and ROA, where the model, however, have shortcomings. A general explanation for this is that there is no global concept for CSR and thus it is difficult to measure. In addition, difficulties were discovered regarding determining market value of Swedish firms as companies generally do not have all of their shares on the stock market and that there are different classes of shares.   Suggestions for future research: One suggestion is a cross-sectional regression, similar to this study that compares different ways to define ROA and size. It would also be interesting to through a time series analysis be able to examine when, time wise, CSR activities makes an impact on Tobin’s Q and ROA.   Contribution of the thesis: Identify influencing factors to contribute for a future benchmark of econometric models when measuring CSR.

為強化公司治理，我國強制上市(櫃)公司須於2011年底前設置薪酬委員會，本研究首先探討公司自願在2011年底前設置薪酬委員會之因素。因為法令還未強制設置薪酬委員會前，我國已自願設置薪酬委員會之公司約2%，無法使用差異中之差異法(Difference-in-difference)，故本研究以我國家族企業為研究對象，探討相較於非家族企業，薪酬委員會設置對家族企業之公司價值的影響。 本研究結果顯示產業龍頭公司有設置薪酬委員會、公司規模、股東權益報酬率及董事會之獨立性與自願設置薪酬委員會呈現正相關。另外，家族企業相較於非家族企業而言公司價值較低，設置薪酬委員會後公司價值差距變小，但是未達統計上的顯著，亦即，設置薪酬委員會對家族企業的效益及非家族企業的效益沒有顯著差異。 / In order to enhance corporate governance, the R.O.C. Securities and Exchange Act was amended in 2010 to force listed companies to establish a Compensation Committee by the end of 2011. First, this study is to investigate which determinants may encourage companies to voluntarily establish the compensation committee. Then, we investigate whether setting compensation committee or not can increase firm value in family firms more than non-family firms. Because of few volunteers, we can’t use difference-in-difference. The results implicate that voluntary formation of compensation committee is associated with leading enterprise in industry which establishes compensation committee, greater size of the firms, higher return on equity and higher independence of the board of directors. In addition, on comparing Compensation Committees established or not, there appears to be no significant correlation with firm value between family firms and non-family firms.

民國90年代初期，我國參照美、日私募之規定，正式引進私募制度。此後，企業得以選擇公開現金增資，或透過私募發行新股，來募集所需的營運資金。根據統計，民國94年以後，台灣的私募市場日趨成熟，私募逐漸成為企業最重要的籌資管道之一，特別是讓原先不能符合公開募集資格之公司，合法迅速取得資金。雖然私募之平均發行金額仍小於公開現金增資，但近年來私募件數平均都有超越公開現金增資之表現，顯示私募在資本募集市場的重要角色，也肯定其對於企業和經濟發展之正面功效。 過去文獻指出，美國之私募平均以折價發行，且有顯著正的宣告股價效果。針對不同樣本之特性，Wruck（1989）、Hertzel and Smith（1993）和Barclay, Holderness and Sheehan（2007）分別提出監督假說（monitoring hypothesis）、資訊不對稱假說（information asymmetry hypothesis）和自利假說（entrenchment hypothesis）解釋之。雖然我國之私募制度多參照美國而訂定，但法律架構和私募流程仍有相當程度的差異。因此，本研究將以上述三大假說為基礎，藉由樣本敘述統計和線性迴歸分析，探討我國上市上櫃公司私募之定價與宣告股價效果。 我們自公開資訊觀測站收集民國91年至98年7月底之私募股權樣本，扣除變數資料不全者，最後共有398筆，包含上市公司174筆，上櫃公司224筆。研究發現，我國私募多以折價發行。其中，特別股之折價幅度低於普通股，電子科技類普通股之折價幅度又高於普通股之平均。而且，根據迴歸結果，私募金額、私募比率和公司規模三個變數最能解釋我國私募之折溢價幅度，但並沒有傾向支持任一個私募假說。 至於宣告股價效果，我國私募董事會和股東會皆不顯著為正，且宣告股價效果的迴歸解釋力也偏低，只有股價淨值較具顯著性。探究其原因，可能是因為我國私募制度不同所致。依證交法之規定，私募股權需先經由董事會和股東會同意後，始得募集。然而，最後私募成功與否常與市況和發行公司能否找到適當投資人等密切相關。既然兩事件日都不能保證私募可以如期完成，我們也就無法預期投資人會對私募有明確迅速的反應。 / In the beginning of 2000, Taiwan’s Securities Transaction Law was amended to introduce the new way of financing- private placements. Since then public corporations are allowed to issue new securities either by public offerings and private placements. According to statistics, after 2005 private placements have become one of the most important funding sources for corporations, especially for those who are disqualified for public offerings. Although the average proceed of private placements is still relatively small, the number of private placements has already surpassed that of public offerings in recent years. This manifests the important role of private placements in building a sound financial market. Private placements in the U.S., despite selling at discounts, are associated with significant positive abnormal returns on the announcement date. With different sample characteristics, Wruck (1989), Hertzel and Smith (1993) and Barclay, Holderness and Sheehan (2007) suggest monitoring hypothesis, information asymmetry hypothesis and entrenchment hypothesis respectively. Our study is based with these three most accepted hypotheses and aims to give an insight in Taiwan’s private placement of equities for public corporations. I search the Market Observation Post System for all private placements from 2002 to July of 2009, and obtain a sample of 398 private equities with complete data. Empirical evidence shows that Taiwan’s private equities are selling at discounts as well and “proceeds of private equity”, “placement fraction” and “corporate size” are the three significant explanatory variables for discounts. However, all the results seem not to fully support any hypothesis as mentioned above. On the other hand, the announcement stock price effects on the board and shareholders’ meeting are insignificantly positive in Taiwan. The regressions on the announcement stock price returns also indicate low explanatory power with only “Tobin’s Q” variable being significant overall. This may be attributed to the legislation differences between U.S. and Taiwan. According to Taiwan’s Securities Transaction Law, private equities should be first approved by the board and shareholders’ meeting, but might not be a successful private equity placement due to market condition, lack of proper investors and others. As a result, we can’t expect investors would instantly, correctly respond to this resolution information on those announcement dates.

Thesis (MEng)--Stellenbosch University, 2015. / ENGLISH ABSTRACT: Numerous problems with product quality and time-to-market launches can be traced back to the management of the product lifecycle. This research assignment provides insight into how an integrated value proposition design framework can address these issues by shifting the focus of product lifecycle management from being product-centric to being customer-centric. This framework combines tools, methods and processes from a variety of disciplines such as Systems Engineering, Marketing, Project Management, and Financial Management. The application of the framework during the product lifecycle management process is that of a planning and communication tool to ensure integration between multifunctional teams to increase customer value proposition quality and decrease product time to market. This research assignment was implemented in a new product development case study within a leading Telecommunications company in South Africa. / AFRIKAANSE OPSOMMING: Die bestuur van ‘n produk se lewensiklus veroorsaak verskeie probleme wat gepaard gaan met die kwaliteit van produkte en die verlengde tydperk wat dit neem om produkte aan die mark bekend te stel. Hierdie navorsingswerk verduidelik hoe die geïntegreerde waarde-stelling raamwerk die probleme met betrekking tot die bestuur van produkte se lewensiklusse aanspreek. Die raamwerk verskuif die fokus van die bestuur van ‘n produk se lewensiklus, wat produk-gesentreerd is, na ‘n kliënt-gesentreerde fokus. Die raamwerk maak gebruik van tegnieke, metodes en prosesse verkry uit die dissiplines van Sisteem Ingenieurswese, Bemarking, Projek bestuur en Finansiële bestuur. Die toepassing van die raamwerk verbeter die bestuur van ‘n produk se lewensiklus deur beplanning en kommunikasie te fassiliteer tussen multi-funksionele spanne. Genoemde raamwerk bevorder die samewerking tussen multi-funksionele spanne, verbeter die waarde-stellings aan kliënte, verhoog die kwaliteit van produkte en verkort die tydperk van produk bekendstelling aan die mark. Bogenoemde navorsingswerk is geïmplementeer in ‘n vooraanstaande Telekommunikasie maatskapy in Suid-Afrika, op ‘n nuwe produkontwikkeling gevallestudie.

The board of directors holds a key position in corporate governance. The board is responsible for the strategy and development of the firm. The gender composition of the board can affect the quality of this operating procedure by changing the dynamic of the group. This paper aims to investigate if there is any relationship between board gender diversity and the firm’s financial performance, as measured by Tobin’s Q. While most of the previous studies in this field has been conducted on US data, this study adds to a growing number of articles outside of the US by using Swedish data. The study uses panel data over the years 2011-2014 and finds no statistically significant link between gender diversity and a firm’s financial performance. This study adds to the minority of articles that argue that gender diversity does not affect performance. Limitations regarding the methodology is presented and strategies for future research is discussed.

Submitted by Marcia Bacha (marcia.bacha@fgv.br) on 2012-05-09T21:09:15Z No. of bitstreams: 1 Rodrigo_Leite.pdf: 595528 bytes, checksum: 2f96f8cf74f020649318903cf9f2f7cc (MD5) / Approved for entry into archive by Marcia Bacha (marcia.bacha@fgv.br) on 2012-05-09T21:09:29Z (GMT) No. of bitstreams: 1 Rodrigo_Leite.pdf: 595528 bytes, checksum: 2f96f8cf74f020649318903cf9f2f7cc (MD5) / Made available in DSpace on 2012-05-09T21:09:36Z (GMT). No. of bitstreams: 1 Rodrigo_Leite.pdf: 595528 bytes, checksum: 2f96f8cf74f020649318903cf9f2f7cc (MD5) Previous issue date: 2011 / Diversos artigos analisam o ciclo de vida das empresas e identificam que, ao longo do tempo, o' desempenho tem um formato de U invertido, em que a empresa atinge um nível ótimo e, a partir daí, declina devido à rigidez e à dificuldade de acompanhar as mudanças de mercado. O objetivo desse trabalho é investigar a relação existente entre idade da firma, valor e desempenho das empresas brasileiras. Verificamos também se existe efeito da idade da firma em suas práticas de governança. Analisamos 250 empresas brasileiras listadas na BM&FBovespa durante o período de 2002 a 2009. Nossos resultados indicam que, no Brasil, a relação não tem forma de U invertido, e as firmas mais velhas possuem maior valor e melhor retorno. Mostramos também que empresas mais velhas possuem melhores práticas de governança. / Several articles analyze the life cycle of companies, having identified throughout time that performance is shaped as an inverted U. The firm achieves an optimum levei and, from that point on, it declines due to the rigidity and difficulties to cope with market changes. The objective of this study is to investigate whether there is a relationship between firm age, value and performance of Brazilian companies. We innovate in the sense that we also verify if firm age affects its governance practices. We analyze 250 Brazilian companies listed at BM&FBovespa from 2002 to 2009. Our results indicate that, in Brazil, the relation is not shaped as an inverted U, and that older firms show higher value and better returno We also report that older firms present better governance practices.

One of the main aims of the underlying research is to respond to continuous calls for introducing and measuring a sound economic definition for best practice disclosure quality (e.g. Beyer et al., 2010) that is derived from a reliable guidance framework (Botosan, 2004) using an innovative natural language processing technique (Berger, 2011). It also aims to examine the impact of corporate governance on best practice disclosure quality. Finally, it aims to examine the joint effect of both best practice disclosure quality and corporate governance on firm value. The thesis contributes to disclosure studies in three principal ways. First, it introduces a new measure for best practice disclosure quality. Further tests show that the proposed measure is reliable and valid. A novel feature of this measure is that it captures all qualitative dimensions of information issued by the Accounting Standards Board, 2006 (ASB) Operating and Financial Review (OFR) Reporting Statement. Second, it uses machine-readable OFR statements for financial years ending in 2006-2009, and develops a language processing technique through constructing five keyword lists. Third, it examines the extent to which disclosure quantity provides a proper proxy for disclosure quality. The analysis shows that disclosure quantity is not a good proxy for disclosure quality. Accordingly, results derived, using quantity as a proxy for quality, are questionable. Results of the association between disclosure quality and corporate governance mechanisms suggest that the most effective governance mechanisms in improving disclosure quality are leadership structure, audit committee meeting frequency, and audit firm size. Using a wide set of corporate governance mechanisms, the study also contributes to three research strands and explains the inconclusive results in relation to the association between disclosure quality, corporate governance mechanisms and firm value. It provides empirical evidence as to which governance mechanisms promote the quality of voluntarily disclosed information in large UK firms. Additionally, it provides empirical evidence as to the joint effect of best practice disclosure quality, corporate governance mechanisms on firm value in the UK. Results also show that best practice disclosure quality enjoys a substitutive relationship with two corporate governance mechanisms (audit committee independence and audit committee size) and a complementary association with board independence in relation to firm value. The study has various research and policy implications. It suggests new research avenues for re-examining disclosure relationships, especially research areas that do not have persuasive conclusions such as the economic consequences of disclosure quality. Such research may inform both regulators and managers as to the costs and benefits of disclosure quality to both firms and stakeholders. It also provides feedback on the current disclosure practices by firms so that policy-makers can modify reporting frameworks/guidance accordingly.

A governança corporativa visa aumentar a probabilidade dos fornecedores de recursos garantirem para si o retorno sobre seu investimento, por meio de um conjunto de mecanismos no qual se inclui o Conselho de Administração. O tema possui importância crescente, por ser bem difundida a hipótese de que a estrutura de governança afeta o valor da empresa. A questão é descobrir se existe uma estrutura de governança corporativa "melhor" ou "ideal". Vários códigos de governança foram elaborados com este intuito. No Brasil, destacam-se os códigos do Instituto Brasileiro de Governança Corporativa (IBGC) e da Comissão de Valores Mobiliários (CVM). Esta dissertação investiga se a estrutura de governança corporativa foi relevante para as companhias abertas brasileiras de 1998 a 2000 e se as companhias adequadas às recomendações do IBGC e da CVM alcançaram maior valor de mercado ou melhor desempenho. Três variáveis de governança foram consideradas: separação dos cargos de diretor executivo e presidente do conselho (DE), tamanho do conselho (TOT) e independência do conselho (INDEP). Utilizou-se uma regressão múltipla do tipo seção transversal entre as variáveis dependentes de valor e desempenho e as variáveis independentes de governança corporativa. A variável diretor executivo como presidente do conselho (DE) apresentou os resultados mais importantes, com forte evidência de que, em média, as empresas que têm pessoas distintas ocupando os cargos de diretor executivo e presidente do conselho são mais valorizadas pelo mercado. A variável tamanho do conselho (TOT) apresentou uma relação certamente não linear, sugerindo que as empresas com um número intermediário de conselheiros alcançam melhor desempenho. A variável independência do conselho (INDEP) não apresentou relação significativa contra as variáveis de valor e desempenho. / Corporate governance seeks to increase the probability that suppliers of financial resources will assure themselves the return on their investment through a set of mechanisms including the Board of Directors. The subject has growing importance, because it is well spread the hypothesis that corporate governance affects firm value. The question is to find out if there is a "better" or "ideal" corporate governance structure for the firm. Several corporate governance codes were prepared with this purpose. In Brazil, we highlight the IBGC (Brazilian Institute of Corporate Governance) and the CVM (Brazilian Securities and Exchange Commission) codes. This dissertation investigates if the corporate governance structure was important to Brazilian listed companies from 1998 to 2000 and if the companies more adjusted to the IBGC and CVM recommendations achieved higher market value or superior performance. Three governance variables were considered: the separation of chief executive officer and chairman positions (DE), board size (TOT), and board independence (INDEP). The multiple regression method with cross sectional data was applied between firm value and performance dependent variables and corporate governance independent variables. The variable chief executive officer as chairman (DE) has showed the most important results, with strong evidence that, on average, firms with different people in charge of the chief executive officer and chairman positions have higher market value than the others. The variable board size (TOT) has showed a clear non linear relation, suggesting that firms with an intermediate number of directors achieve superior performance. The variable independence of the board (INDEP) has not showed a significant relation against the variables of value and performance.

Este estudo investiga se o planejamento tributário efetuado pelas companhias abertas é uma prática de gestão que gera valor para o acionista. Embora se possa conjeturar que o aumento de lucros proporcionado pela economia de tributos contribua para elevar o valor da firma, uma avaliação incompleta de todos os custos do planejamento tributário possibilita o surgimento de quadros em que os custos superam os benefícios, reduzindo o retorno para os acionistas e afetando negativamente o valor da firma. Estudos desta questão efetuados em outros países apresentaram resultados variados. Para a verificação empírica, utilizou-se de análise de dados em painel, realizada sobre uma amostra de 1.432 observações do tipo empresa-ano, composta por 310 companhias abertas negociadas em bolsa nos anos de 2007 a 2012. O valor da firma foi estimado pelo Q de Tobin e o planejamento tributário por duas métricas distintas, alternadamente: Book-Tax Differences, controlada por accruals, e total de tributos distribuídos na DVA, ambas padronizadas pelo ativo. Visando obter resultados robustos, a amostra foi estratificada em função da agressividade histórica das firmas quanto ao planejamento tributário. Os resultados mostram que existe uma relação negativa entre planejamento tributário e valor da firma no estrato das firmas mais agressivas, não tendo havido convergência de evidências no estrato das firmas menos agressivas. Em função das peculiaridades do mercado de capitais brasileiro, foram analisados também os efeitos da governança corporativa, da gestão familiar e da concentração acionária sobre a relação estudada. Os resultados mostram que estes fatores não conseguem conter a diminuição de valor ocorrida no estrato das firmas agressivas. A contribuição desta pesquisa para a literatura consiste na demonstração dos efeitos que os custos de agência exercem sobre as avaliações dos investidores no mercado de capitais e na evidenciação da relação negativa entre planejamento tributário e valor da firma, detectada no conjunto das firmas agressivas, o que pode orientar a conduta dos investidores, analistas de mercado e gestores. / This study investigates whether tax planning activities conducted by publicly traded firms represent a management practice that creates shareholder value. While one might say, at first, that the increase in profits provided by the tax savings contributes to raise the value of the firm, an incomplete assessment of all the costs of tax planning facilitates the emergence of scenarios in which the costs outweigh the benefits, reducing the return to shareholders and adversely affecting the firm value. Studies of this issue in other countries found mixed evidence. For the empirical verification, analysis of panel data was conducted on a sample of 1,432 firm-year observations, composed of 310 publicly traded firms in years 2007 to 2012. Firm value was estimated by Tobin\'s Q and tax planning was proxied by two distinct metrics, alternately: Book-Tax Differences, controlled by total accruals, and total taxes distributed in Value Added Statement, both scaled by total assets. In order to obtain more robust results, the sample was stratified according to historical aggressiveness of the firms\' tax planning. The results show that there is a negative relationship between tax planning and firm value in the stratum of the most aggressive firms. Evidence didn\'t converge for the stratum of less aggressive firms. Due to the peculiarities of the Brazilian capital markets, the effects of corporate governance, ownership concentration and family management over the investigated relationship were also analyzed. The results show that these factors can not contain the value destruction that occurs in the stratum of the aggressive firms. The contribution of this research to the literature consists in demonstrating the effects that agency costs have on firm evaluations made by investors in the Brazilian capital markets and the disclosure of the negative relationship between tax planning and firm value found in the group of the aggressive firms, which can guide the behavior of investors, market analysts and managers.