Ottonello, GiorgioSerio, Giulio2026-01-302026-01-302025-06-272025-06-27http://hdl.handle.net/10362/199871This thesis traces the story of how ESG principles reshape global equity investment. We traverse a universe of sustainability screens, from light touch to hard edged exclusions, and investigate "best in class" and "worst in class" stock selection. Along the way, we observe how conservative ESG tilts blend seamlessly with classical returns, while more severe filters can greatly alter performance, absorbing shocks, and guiding investors towards more stable options. Ultimately, ESG is less a shortcut to higher returns than a map for navigating risk, pointing portfolio decisions toward long term direction and stability.engESG InvestingSustainable financeEquity ETFsPortfolio optimizationRisk-adjusted returnsmaster thesis204127793