Literature reveals studies on mutual fund performance analysis and persistency, with various results. Some studies support hort term performance persistence, while the rest claiming no such persistency among the portfolios. This thesis is an attempt to analyze the performances of Turkish open-end mutual funds for the period of 2003-2010 and search for persistency by extending the time period to June 2011. For performance evaluation, single factor CAPM and ama-French&rsquo / s Three Factor Model are applied. Persistency analysis is done by tracking the relative fund performances on a monthly basis. The results of this study indicate that for the sample period, Turkish A Type mutual funds neither overperform nor underperform the overall market. Nearly all Jensen&rsquo / s alphas are found to be zero, statistically significant. This is also an implication that the mutual funds are earning their expected returns in an efficient mutual fund market in Turkey. The Fama-French&rsquo / s three factor model shows slightly better performance, on the other hand. The size and book to market equity factors are not found significant in general, however they are found jointly significant in all regressions. Persistency is analyzed by tracking the mutual fund erformances on monthly basis. When some mutual funds showed negative or positive performance persistency during the period individually, but the overall picture demonstrates a balanced distribution of performance groups. The number Loser-Loser performances is slightly more than the other three groups, resulting in a tendency for short term negative persistency for the sample analyzed between the period of January 2003 to June 2011.

Les législations concernant les marchés financiers régissent non seulement les marchés, mais également les acteurs, les produits ainsi que les activités dans les marchés. En utilisant ces outils juridiques indispensables, les législateurs des deux côtés de l'Atlantique visent, entre autres, à protéger les investisseurs dont la confiance est primordiale pour les marchés, d'une part, et à diminuer les risques systémiques dont le déclenchement pourrait survenir dans un contexte financier de plus en plus globalisé, d'autre part. En effet, après la crise financière globale de 2008, les risques systémiques ont attiré davantage l'attention législative. À partir desdits objectifs que les législateurs veulent atteindre, nous essayons de trouver et analyser les particularités des législations concernées, tant en France ou dans l'Union européenne qu'aux États-Unis, en passant par la comparaison des dispositions législatives ou des initiatives législatives à travers l'Atlantique, avec la considération de l'évolution législative respective. Nous apportons aussi nos réflexions sur les insuffisances ou les déficiences à l’égard de mesures ou d’efforts législatifs pris en compte par les législateurs transatlantiques en vue de réaliser ces objectifs. Face à une crise financière sans précédent à nos jours, et donc à l'exigence d'une réaction législative active, appropriée, opportune et raffinée, il nous semble qu’il est le temps pour les législateurs en France, dans l'Union et aux États-Unis d'approfondir leurs connaissances sur des produits financiers en innovation sans cesse, de mieux adapter leurs stratégies législatives aux développement des activités financières et des entités finiancières, et de renforcer leurs coopérations et coordinations en profondeur dans le domaine de réglementation et supervision financière, et enfin, de mieux réaliser leurs buts poursuivis. / The legislations concerning financial markets govern not only the markets, but also the participants, the products and the activities as well in the markets. By using these indispensable legal tools, the legislators of both sides of Atlantic aim at, among others, protecting the investors whose confidence is of top priority to the markets, on the one hand, and reducing the systemic risk which would occur in a more and more globalised financial context, on the other. Indeed, after the global financial crisis of 2008, systemic risk has drawn more legislative attention. From the abovementioned objectives which the legislators would like to achieve, we try to find and analyze the particularity of the legislation concerned, both in France or in the European Union and in the USA, by way of comparison of legislative dispositions or legislative initiatives across the Atlantic, with the consideration about their respective legislative evolution. We also give our reflections on the insufficiencies or the deficiencies with regard to the legislative measures or efforts taken by the transatlantic legislators to realize those objectives. Facing the actual and unprecedented financial crisis, and thus a requirement of dynamic, appropriate, timely and refined legislative reaction, it seems to us that it is the time for legislators in France, in the EU and in the USA to deepen their knowledge about financial products of non-stop innovation, to better adapt their legislative strategies to the development of financial activities and financial entities, to reinforce their cooperation and coordination in depth and in width in the field of financial regulation and supervision, and finally, to better fulfill their pursuing goals.