Otero González, LuisDurán Santomil, PabloDomingues, Renato Heitor Correia2018-02-062018-02-062017http://hdl.handle.net/10347/16421This tesis explore three topics that contribute to understanding how ratings can help investors selecting mutual funds. The chapters are independent of each other in terms of theoretical grounding and methodology but complement each other by investigating the three different angles related. In Chapter 2 is analysed the Morningstar Star Rating can help the predictive power of future performance, in Chapter 3 the Morningstar Analyst Rating and if analyst opinions can help identifying the best mutual funds and in the Chapter 4 if Morningstar Sustainability Scores and ESG ( enviromental, social and governance) scores can evaluate the effect of portfolio management decisions based on sustainable criteria. Our conclusions, support the a strong ability of the predictive power of Star Ratings and a weak predictive power of Analyst Morningstar Ratings. Also, Morningstar Sustainability Score is significant explaining the level of performance for all the metrics analysed.engEsta obra atópase baixo unha licenza internacional Creative Commons BY-NC-ND 4.0. Calquera forma de reprodución, distribución, comunicación pública ou transformación desta obra non incluída na licenza Creative Commons BY-NC-ND 4.0 só pode ser realizada coa autorización expresa dos titulares, salvo excepción prevista pola lei. Pode acceder Vde. ao texto completo da licenza nesta ligazón: https://creativecommons.org/licenses/by-nc-nd/4.0/deed.glhttps://creativecommons.org/licenses/by-nc-nd/4.0/deed.glMorningstarRatingsmutual fundsreturn-riskMaterias::Investigación::53 Ciencias económicas::5312 Economía sectorial::531206 Finanzas y segurosMaterias::Investigación::53 Ciencias económicas::5311 Organización y dirección de empresas::531102 Gestión financieradoctoral thesisopen access