US stocks swung mostly lower on Tuesday amid a batch of pessimistic earnings reports and concerns that trade turbulence may not have ended. The S&P 500 and the Nasdaq 100 hovered below the flatline after reaching records in morning trading, while the Dow fell more than 150 points. Earnings and guidance releases from the largest companies before the open were tilted toward the pessimistic side, with United Health sinking over 5% amid the warning that its full-year earnings are likely to be below expectations, while Merck lost 3% despite posting an earnings beat. Also, UPS plummeted 10% as tariffs are likely to hurt its outlook, and Boeing dropped 3% after its event. On the data front, job openings were slightly below expectations to kick off a batch of new labor market updates this week, although a consumer confidence gauge inched higher. On the trade front, the US extended its tariff truce with China, but the high likelihood of the move prevented a positive reaction for stocks.