This paper investigates whether managers that have a propensity for personal tax aggressiveness are associated with tax avoidance at the firm level. Motivated by Dhaliwal, Erickson, and Heitzman (2009) and Hanlon and Heitzman (2009), I construct a measure of personally tax aggressive ("aggressive") managers and determine whether corporate tax avoidance activities increase in their presence. The results of my study indicate that aggressive managers are associated with firm-level tax avoidance. The neoclassical view would suggest that aggressive managers' tax expertise could benefit shareholders through lower tax payments. Since aggressive managers extract their personal tax savings from shareholders, non-tax agency costs potentially increase in their presence. This has implications for the association between aggressive managers and firm value. Using the framework established through the agency view of tax avoidance (Desai and Dharmapala, 2008) I find that on average the presence of aggressive managers is associated with increased firm value. However, consistent with recent research, governance is an important moderating factor whereby firm value in the presence of aggressive managers tends to increase only for relatively better-governed firms.

This thesis investigates whether environmental, social, and governance (ESG) performance impacts financial performance in the Swedish market. ESG performance is measured using the overall ESG score and the three individual pillar scores (environment, social, and governance). Financial performance is assessed using a market-based financial measure(Tobin's Q) and an accounting-based financial measure (Return on Assets, ROA). Further, we introduce a one-year lag between ESG performance and financial performance. We analyze a total of 858 firm-year observations from 266 firms listed on the NASDAQ Stockholm stock exchange over the five-year period from 2018 to 2022, with controls for firm size and leverage. Our findings reveal that none of the ESG performance measures have an impact on the financial performance measures (ROA or Tobin’s Q). This indicates a need for further research into the complexities of the ESG impact on firm financial performance within the Swedish context.