This thesis deals with 3 important aspects of optimal investment in real-world financial markets: taxes, crashes, and illiquidity. An introductory chapter reviews the portfolio problem in its historical context and motivates the theme of this work: We extend the standard modelling framework to...

This dissertation comprises of three stand-alone research papers, all considering the use of high frequency financial data for financial market risk measurement. The first chapter considers the extraction of liquidity information from the intraday limit order book to enhance the daily market...