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MARKET BRIEFING · US

The indexes set a fresh record, and storage stocks fell apart on their own.

October 6, 2026 · Read the Korean original

Major indices

  • Dow 51,521.28 +0.49%
  • S&P 500 7,818.93 +0.58%
  • Nasdaq 27,599.79 +0.45%

The overnight US session caught its breath as yields and oil both backed off. CNBC reported that the 10-year Treasury yield, which had spiked to its highest level since April 2002 the day before, fell more than 2 basis points to 5.286%, while the 2-year slipped to 4.80%. Oil declined even as ship attacks continued around the Strait of Hormuz, which eased the pressure from rates. CME FedWatch put the odds of a hold at the next meeting at around 80%, and investors were waiting for the September FOMC minutes due Wednesday US time.

That breathing room flowed back into tech, and the S&P 500 finished above 7,800 for the first time. The S&P 500 rose 0.58% to a record close of 7,818.93, the Dow added 0.49% and the Nasdaq 0.45%. After the Nasdaq set its own record to start the week, all three indexes advanced together.

Within semiconductors, though, the split was stark. Marvell Technology raised its fiscal 2028 revenue target to 20 billion dollars at its investor day and jumped 5.81% to close at 287.01 dollars, while Intel fell as questions about its slow profit recovery resurfaced ahead of earnings. Storage took the roughest hit. A report that Toshiba will double hard disk drive capacity to chase AI data-center demand sent Seagate and Western Digital down 7% to 9% at one point in the session, and Citi countered that the market may be overstating the impact because Toshiba has to source key components from outside suppliers. Power and nuclear names went the other way. The US Department of Energy confirmed a loan of up to 4.2 billion dollars for Vistra to extend and upgrade three nuclear plants, and a Constellation Energy supply deal with Google lifted the sector broadly.

In Korea today, semiconductors face materials pulling in both directions. Hopes for AI accelerators and custom chips remain intact, but if worries about expanding storage supply spread into memory sentiment, that could weigh on Samsung Electronics and SK hynix. The catalyst is hard disk capacity, however, which sits some distance from DRAM and NAND, and one report noted Micron barely moved, so it does not translate directly. On the other side, Washington funding nuclear life extensions and a fresh data-center power contract leave room for expectations in the nuclear and power infrastructure value chains to carry on.

What is confirmed is that the S&P 500 closed at a record above 7,800 with all three major indexes higher, that the 10-year yield retraced from the previous day's peak, and that the Energy Department loan to Vistra and Marvell's raised target came from company and government announcements. Attributing the storage selloff to Toshiba's expansion, and the pushback that its impact is overstated, remain the judgment of the press and analysts for now. Index moves differed slightly across outlets at the decimal level, so we followed two that gave the same values.

Korean industries to watch today

  • Semiconductors · Custom-chip hopes arrive alongside worries about expanding storage supply
  • Nuclear power · A US Energy Department loan for nuclear life extension revives atomic-power hopes
  • Power infrastructure · Another data-center power supply deal was signed

Watchlist stocks in the news

  • Marvell Technology (MRVL) Close +5.81% · Raised its fiscal 2028 revenue target to 20 billion dollars at its investor day, topping expectations. (The Motley Fool)
  • NVIDIA (NVDA) · Touched a fresh record again on continued AI chip optimism, leading tech higher. (Yahoo Finance)
  • AMD (AMD) · Hit a new high alongside Nvidia on expectations for AI accelerator demand. (Yahoo Finance)
  • Broadcom (AVGO) · Ended among the semiconductor gainers as demand for its custom AI chips drew attention again. (Strategitz)
  • Intel (INTC) · Fell out of the tech rally as questions mounted before earnings about profit recovery lagging better sales. (Strategitz)
  • Seagate (STX) · Slid sharply during the session on a report that Toshiba will double hard disk capacity, raising share and pricing worries. (24/7 Wall St.)
  • Western Digital (WDC) · The Toshiba expansion report hit the hard disk group, compounded by profit-taking after this year's surge. (24/7 Wall St.)
  • Sandisk (SNDK) · Dropped with the group as investors reassessed data-center storage demand and margins. (CNBC)
  • Nebius (NBIS) · Rose strongly during the session as enthusiasm for AI infrastructure spending returned. (CNBC)
  • CoreWeave (CRWV) · Rode the broader strength in AI infrastructure names without a company-specific catalyst. (CNBC)

Sources (Korean-language)

This market briefing was compiled by AI from this site's own price and filing data together with public news reports, and translated from the Korean original. Please check the sources below before relying on it.

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