S&P 500, Nasdaq Post Q3 Gains; Tech Defies September Weakness

US equities closed mixed on the last day of Q3, but the S&P 500 and Nasdaq recorded quarterly gains, with the tech index shrugging off the typical September weakness. The mixed close suggests some profit-taking or sector rotation, but the quarterly advance signals sustained risk appetite. The resilience of tech despite seasonal headwinds points to underlying strength, though the mixed finish leaves near-term direction uncertain.