Business Stock Market Today: S&P 500 Flat Amid AI Concerns & Economic Worries by Marcus Liu - Business Editor February 18, 2026 by Marcus Liu - Business Editor February 18, 2026 US Stock Market Navigates AI Concerns and Economic Data Novel York – U.S. Stock market indices experienced a mixed close on Tuesday, February 17, 2026, as investors reacted to concerns … 0 FacebookTwitterPinterestEmail