Intel Stock Halves as $3.7 Trillion Chip Rout Spreads

Intel's slide is now a sector problem

The striking part of Monday's session wasn't that chip stocks fell. It's that almost nothing else did.

About seven in ten S&P 500 stocks closed higher on Monday. Nearly every chip stock went the other way, and the group lost more than $400 billion in market value in a single session, according to Yahoo Finance's calculations.

Intel dropped roughly 9%, one trading day after its worst session since 1974. That Oct. 30 plunge — nearly 29% — followed a forecast that disappointed investors, and Monday's close left the company worth less than half of what it was at the end of September.

The pain didn't stop at Intel's door. Micron, Sandisk, Seagate and Western Digital — the memory and storage names that carried the chip boom through most of this year — each fell roughly 6% to 8%. Marvell fell harder still, a move that coincided with its agreement to buy Lumentum in a $115 billion deal.

Nvidia held up better than most of its peers, but it is still down about 16% since Oct. 6. That date is becoming the reference point for the whole sell-off: chip and memory stocks have lost about $3.7 trillion in market value since then, by Yahoo Finance's math. Nvidia lost the most in absolute dollars; Intel's near-50% decline is the steepest among the sector's giants.

What the bulls and the bears are saying

Adam Johnson of Bullseye Brief thinks the worst may already be priced in. "The market kitchen-sinked it," he told Yahoo Finance on Monday. "They discounted everything that could go wrong. And when you do that, typically that's when you see a bottom."

John Chambers, Cisco's former CEO and now head of JC2 Ventures, is less optimistic about the group as a whole. "There will be major train wrecks," he told Yahoo Finance. "And rising tide does not raise all boats. I would not bet against Nvidia."

The historical record is genuinely mixed. Stock Trader's Almanac editor Jeff Hirsch, who coined the term "Octoberphobia," bought the sell-off on Oct. 30. Chips have climbed in all eight midterm cycles since 1994, measured from the last October close through the following June. But in 2002 and 2018, they fell about another 11% before turning.

AMD's earnings are the next test

The sector gets a fresh data point on Tuesday, when AMD reports third-quarter results after the closing bell.

AMD is the closest thing investors have to a clean read on AI chip demand outside Nvidia, and its guidance will land in a market that has spent a month deciding how much of the AI trade to keep. A strong report could steady the group; a cautious outlook would give the rout another leg.

Not everything AI-adjacent bled on Monday. SpaceX rose, though it remains well below where it started October. Software was mixed, with cybersecurity names such as Fortinet and CrowdStrike falling alongside chips rather than decoupling from them.

The pattern is worth watching: this is not a broad risk-off day. It is a repricing of one specific trade, and the market is still working out where the floor sits.

What it means for you

For US, UK and EU readers, the practical impact is mostly in portfolios rather than products. Anyone holding broad index funds has chip exposure through the S&P 500 and global tech funds, which is why a session where 70% of stocks rose can still feel bad. Direct holders of Intel, Micron or Marvell shares have taken the brunt.

There is no consumer-price story here yet. Chip pricing, memory pricing and data-center contract terms are set separately, and none of Monday's moves changed them. The next real signal for buyers and builders arrives with AMD's earnings and the guidance that follows.

Intel's collapse is severe enough to be its own story, but the memory and storage sell-off is what makes this a sector event. With AMD reporting Tuesday and history offering no clear answer, the next few sessions will say more about where the AI trade settles than any single forecast.