Woofun AI reports that major US stock indices opened lower on Monday, with the Nasdaq Composite dropping 1.1%, the S&P 500 declining 0.67%, and the Dow Jones Industrial Average falling 0.44%. Micron Technology shares plunged 6% shortly after opening, driving the tech sector's underperformance, while SpaceX fell 1.8% and Apple gained 0.1%.

The market weakness follows a mixed week where defensive sector gains were offset by losses in technology and consumer discretionary stocks. Rising 10-year Treasury yields added pressure to growth stocks, and investors are monitoring upcoming economic data, including consumer confidence and manufacturing PMI figures, for further clarity on the US economy.