According to @StockMKTNewz, the combined market cap of the world's 10 largest stocks is $26.33 trillion, down from $26.49 trillion last week (source: @StockMKTNewz on X, Jan 18, 2026). This equals a $0.16 trillion (~0.6%) week-over-week decline derived from the posted figures (source: @StockMKTNewz on X, Jan 18, 2026). Crypto traders monitor such mega-cap equity moves because crypto–equity correlations have risen since 2020, increasing cross-asset risk transmission (source: IMF, Crypto Prices Move More in Sync With Stocks, Jan 2022).