Context:

A midday rally in several influential Big Tech stocks helped lift U.S. shares, offsetting a slide in Apple and a mixed broader market. The broader market advanced as AI-related names regained momentum after a wobble, with investors watching tech valuations and earnings signals amid ongoing macro uncertainty. While Apple faced pressure from higher memory-chip costs eroding per-dollar profit, other AI-linked firms supported gains and contributed to a generally resilient mood. The backdrop included notes on midterm election dynamics and expectations for continued profit growth despite inflation and higher rates, suggesting a cautiously optimistic path ahead. The overall tone remains that technology leadership could drive further upside if AI demand remains robust and policy or macro risks stay contained.

Dive Deeper:

• Nvidia increased by 2.9%, emerging as the strongest contributor to the market's uptick on Tuesday and helping buoy the S&P 500.

• Broadcom rose 3.8%, Advanced Micro Devices gained 5.5%, and Micron Technology added 3%, highlighting continued strength in AI-related semiconductor names.

• Apple fell 2.7% as rising memory-chip costs from AI-data-center demand pressured margins, despite reporting stronger quarterly results than expected.

• Palantir Technologies declined 1.5% even after beating profit expectations, despite stronger commercial revenue in the U.S. market.

• Stocks of firms reporting better-than-expected summer profits aided the session, with Celanese up 3.7%, DuPont up 6.9%, and Revvity jumping 12%.

• Economy-wide signals included a robust job-market briefing hinting at higher openings and a 10-year Treasury yield around 4.93%, underscoring ongoing rate and inflation considerations.

• The market mood also reflected election-year dynamics, with some traders weighing potential regulatory shifts on AI while investors still favored policy stability and a split Washington.