$NVDA $AAPL $GOOGL $MSFT — A wave of legal notices and class-action filings rattled sentiment today, led by a DoorDash investigation tied to a $131.5M payout and an Alibaba securities suit with an Oct. 5 lead-plaintiff deadline. Against that backdrop, AI and semiconductor names showed momentum (NVDA +1.7%), while Big Tech technical setups (AAPL, GOOGL, MSFT) warrant close monitoring.