July 21 (UPI) -- Two U.S. stock indexes -- Standard and Poor's 500 and Nasdaq 500 -- were trading at record highs during trading Monday as companies release earnings this week, though investors brace for U.S. tariff increases. The S&P 500 hit an intra-day high of 6,335.79, or 0.6%, above the record 6,297.36 on Thursday. The tech-heavy Nasdaq reached 21,077.37, a rise of 0.7%, after a record 20,895.66 on Friday. The Dow Jones Industrial Average reached 44,601.85, a climb of 0.6%, and off the