U.S. equity indices closed lower on Wednesday as participants shifted into a defensive posture before key financial disclosures from Nvidia Corp. $NVDA. The S&P 500 Index $^SPX dipped 0.6%, reversing advances from the prior session’s risk-driven rally. Technology-heavy Nasdaq 100 $^NDX followed suit, sliding 0.5%. The adjustment underscores the volatile anticipation surrounding corporate performance, particularly from heavyweight tech constituents.