According to @StockMKTNewz, the title of the largest company has rotated by decade with GM leading in the 1950s–1960s, Exxon in the 1970s–1980s, IBM in the 1980s–1990s, Microsoft in the 2000s, Apple in the 2010s, and NVIDIA in the 2020s tied to AI (source: @StockMKTNewz citing Leverage Shares ETFs). According to @StockMKTNewz, this pattern indicates that market leadership typically reflects the sector driving the global economy in each era (source: @StockMKTNewz citing Leverage Shares ETFs). According to @StockMKTNewz, the current leadership by NVIDIA underscores AI as the dominant macro theme for equity markets in the 2020s, a key context for traders assessing sector rotation and mega-cap concentration risk (source: @StockMKTNewz citing Leverage Shares ETFs).