S&P 500 Closes Up 1.1% as Tech Gains 2.3%; Nasdaq 100 Rises 1.7%

Sep 17, 2026 16:00 ET · Sep 17, 2026

TREE NEWS reports: The S&P 500 closed up 1.1% in preliminary figures, with tech up 2.3%, consumer discretionary up 1.5%, energy up 0.5% and financials down 0.1%. The Nasdaq 100 gained 1.7%, led by ALAB up 9%, Arm Holdings up 8.5%, Intel up 8.1%, AMD and SanDisk up at least 6.4%, Micron up 5.6%, Strategy up 4.7% and Nvidia up 2.5%. The Philadelphia Semiconductor Index rose 3.2% and the storage chip index added 3.4%.

Original source

AI take

The move is a semiconductor story more than a broad market one: chip and storage names outran the headline index by a wide margin, while financials finished slightly lower. That split suggests capital rotating toward hardware and AI-adjacent exposure rather than a uniform risk-on session. Whether the leadership stays concentrated in semis or broadens out is the open question.

Generated by AI for reference only.

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