U.S. stocks post their worst start to a month this year

U.S. equities recorded their worst opening session of any month so far this year as September began with broad market weakness.
The poor start comes as investors contend with elevated bond yields, tighter financial conditions and renewed uncertainty across risk assets.
September has historically been a volatile month for equities, but the immediate focus remains on whether the initial selloff develops into a broader correction or stabilizes quickly.