Tactical investing—making short-term portfolio adjustments in response to changing market conditions—has evolved significantly over the past half-century. Traditional approaches, rooted in discretionary judgments informed by fundamental and macroeconomic analysis, are ceding ground to modern, data-driven methods that leverage quantitative models, algorithmic trading, and advanced analytics. The shift mirrors broader secular trends: the growth of passive investing, increased market electronification, and the rapid expansion of computational power and data availability. In 2023, assets in active...