Nasdaq 100 futures sank 2.8% before Tuesday’s opening bell. Wall Street is on track for a rough start after a memory-chip selloff routed Asian markets overnight. S&P 500 futures fell 1.4%. Futures tied to the Dow Jones Industrial Average held up better, slipping about 0.6%.

The damage started in the chip aisle. Memory-chip stocks — the best performers on the S&P 500 so far in 2026 — led the decline. Micron Technology dropped about 8% in premarket trading. SanDisk fell 9.2%. Western Digital lost 7.5%. The Roundhill Memory ETF (DRAM) slid roughly 13%.

Asia took the brunt. South Korea’s Kospi closed nearly 10% lower, broke below 9,000 points and triggered a trading halt during the session. Memory giants SK Hynix and Samsung Electronics each sank more than 12%.

Why memory chips are leading the selloff

Two forces collided. South Korea’s Financial Supervisory Service intensified warnings about leveraged investment products tied to individual chip stocks, spooking retail traders who had crowded into the trade. [1] At the same time, investors are reassessing whether AI-driven valuations have run too far.

The debate is not new, but the math is stark. The semiconductor index trades near 71 times trailing earnings — its most expensive level since the aftermath of the 2008 financial crisis. Micron stock is up more than 750% over the past year and recently topped an $800 billion market value for the first time.

The concentration risk is familiar to anyone tracking the megacap-tech trade. Investors looking to trim exposure have increasingly turned to broad-market funds that screen out the most crowded names, like these 3 S&P 500 ETFs without the “Magnificent 7”.

The Fed backdrop is turning hawkish

Rates are the other pressure point. The Federal Reserve held its benchmark at 3.50%-3.75% in June, the fourth straight hold and the first meeting under new Chair Kevin Warsh. The statement leaned hawkish: nine officials now see at least one rate hike this year, and according to the CME FedWatch tool futures markets are pricing a move as soon as October.

Higher rates hit growth stocks hardest. The Nasdaq-100 carries the greatest interest-rate sensitivity of the major US indexes, so any shift toward tighter policy amplifies a selloff in tech. The latest Federal Reserve signals have pushed yields higher across the curve, with the 10-year Treasury note hovering near 4.5%.

Oil and the macro calendar

Energy offered a rare bright spot. West Texas Intermediate crude fell about 4% to near $76 a barrel after Washington granted Tehran a 60-day license to sell oil internationally, easing the supply fears that had gripped markets earlier in the quarter. Cheaper oil could soften headline inflation — but it does little to calm a Fed already worried about price pressures.

That tension feeds this week’s main event: the personal consumption expenditures (PCE) report, the Fed’s preferred inflation gauge. A hot print would harden the case for a 2026 hike and keep pressure on tech. The bigger question of whether the economy can absorb higher-for-longer rates is still open, as our look at the US soft-landing debate laid out.

What to Watch for the Open

  • Micron earnings (Wednesday). The memory bellwether reports midweek. Guidance on AI memory demand will set the tone for the whole sector.
  • The 10-year Treasury yield. A push above 4.6% would add fuel to the tech selloff.
  • PCE inflation data. The Fed’s favored gauge lands this week. An upside surprise revives rate-hike bets.
  • Chip-stock breadth. Watch whether the selling stays contained to memory names or spreads to Nvidia and the broader semiconductor complex.

The setup is fragile but not broken. Strong Micron guidance could steady memory names quickly, while a soft PCE number would ease the rate fears driving the rout. Until then, expect a volatile open and thin conviction on both sides.