S&P 500 and Nasdaq Set Intraday Records as Semiconductor Rally Drives Wall Street to New Highs

The Quick Take

• S&P 500 reached an intraday record of 7,844.90 while Nasdaq hit 27,722.75, both driven by AI semiconductor stocks gaining 4-6% on the session
• Marvell Technology and AMD each surged approximately 6% while Broadcom added 4%, concentrating the rally in AI infrastructure chips
• WTI crude at $89.44 and Brent at $100.58 per barrel remained stable, with investors discounting oil inflation risk in favor of AI growth narratives

US equity markets advanced to fresh intraday records on October 6, with the S&P 500 reaching 7,844.90 and the Nasdaq climbing to 27,722.75 before closing at 7,820.85 and 27,599.79 respectively. Semiconductor stocks led the rally with Marvell Technology and AMD each gaining approximately 6% and Broadcom adding 4% — a continuation of the AI infrastructure thesis driving technology sector outperformance throughout 2026. The Dow Jones Industrial Average also advanced 253 points to close at 51,521, reflecting broad but technology-concentrated market participation as investor confidence in AI-driven earnings growth remained strong.

Korean equity market participants and regional institutional investors are monitoring the US tech rally closely given KOSPI's significant weighting in semiconductor exporters Samsung Electronics and SK Hynix, whose revenue cycles are tightly correlated with US AI infrastructure demand. Rising US chip stocks typically signal improving near-term demand from hyperscaler customers, providing forward visibility for Korean and Taiwanese semiconductor suppliers throughout their production planning cycles. Treasury yields retreating slightly reduced the discount-rate headwind that has compressed tech valuations, allowing growth premiums embedded in AI-exposed equities to expand. Oil near $100 per barrel represents a persistent inflation risk that investors are currently discounting as AI growth momentum dominates market sentiment.

Korean investors will be watching the October corporate earnings season, particularly Microsoft, Google, and Meta's AI revenue disclosures, which will confirm whether the tech rally reflects genuine demand or continued forward-looking speculation. Treasury yield trajectory remains the key gating factor — if 10-year yields resume climbing above 5%, technology multiple compression would resume regardless of AI capex guidance quality. Watch KOSPI Samsung Electronics price action as a derivative indicator of whether Korean institutional investors are replicating the US tech trade locally. The macro variable is whether US consumer spending remains resilient despite oil-driven energy costs, keeping the soft-landing narrative that underpins the equity bull market intact.

Synthesized from 2 sources.