Chip stocks had their worst day since 2020. The companies buying the chips barely flinched

The worst day for chip stocks since March 2020 was not spread evenly. On Thursday, Nov. 5, the PHLX Semiconductor Index fell 12.25%. Micron lost 17.5% and AMD 17.3%. Amazon and Alphabet, two of the largest buyers of AI chips, each fell about 2.2%.

That gap is the most useful signal from a session that, by Fortune's count, erased roughly $3 trillion in U.S. stock market value. Investors were not pricing in the end of AI demand. They were pricing in a buildout that arrives slower and costs more, and deciding who carries that cost.

What set it off

The trigger was Tuesday's midterm election. Democrats won control of Congress, and voters backed most of the 41 ballot measures aimed at slowing data center construction, Fortune reported. Democratic candidates in Texas, Ohio and Georgia campaigned on restricting new projects.

Texas matters most. Wells Fargo estimates 27% of planned U.S. data center capacity, measured in gigawatts of power, sits in the state, according to Fortune. Governor-elect Gina Hinojosa wants an immediate moratorium. She may not need a new law: outgoing Gov. Greg Abbott already paused new data center permits in September pending grid and water audits.

UBS strategists estimate about 30% of the data center capacity expected to come online in 2028 is now at risk, Yahoo Finance reported. That is a forecast, not a tally of cancelled projects.

eToro analyst Jakub Rochlitz, quoted by Fox Business, said the market now sees a buildout that is "slower and more expensive." Thursday's price action shows who investors think pays for that.

Why the sellers fell harder than the buyers

The logic is straightforward. If permits stall, Microsoft, Amazon, Alphabet and Meta spend less on data centers in a given year. That cuts their suppliers' revenue. For the buyers, slower spending could even ease the cash-flow strain investors have fretted over for months. Microsoft fell about 3% and Meta about 4%.

Suppliers have no such cushion. A memory-chip exchange-traded fund lost 18% on the day and is down more than half from its June peak. Chip-equipment makers Applied Materials and KLA each fell 14%. Nvidia dropped 9.3%, wiping out its entire 2026 gain.

Power suppliers had already been hit. Vistra, a power producer, fell 14% and Vertiv, which supplies data center cooling and power gear, fell 13% on Wednesday on moratorium fears, Fortune reported. On Thursday, rented-computing firms took their turn: IREN, Applied Digital and Nebius each lost more than 14%, and CoreWeave fell 9.8%.

IREN, Nebius and CoreWeave are "neoclouds," companies that rent out AI chips to other firms. Applied Digital builds and leases data centers for that market. Fortune noted that a Texas permitting slowdown would hurt operators like CoreWeave before it reached their big-tech customers. Many also borrowed heavily to build. Yahoo Finance flagged rising bond yields at Oracle and CoreWeave, tied to their debt loads. Borrowers like these need capacity switched on, on schedule, to cover interest.

A bounce, not a verdict

The election accelerated a slide that was already under way. Over the past month, AMD was down 33%, Micron 32%, Nvidia 21% and Intel 51%, according to 24/7 Wall St. After Thursday's close, the iShares Semiconductor ETF was about 40% below its high, Yahoo Finance reported. Thursday was the Nasdaq Composite's fifth drop of more than 500 points since mid-October, Investing.com noted.

Not everyone reads it as a break in the business. Nomura's Charlie McElligott attributed the selling mainly to hedge funds locking in profits before year-end, not to weaker fundamentals. "They're shooting the generals," he wrote. Argent Capital's Jed Ellerbroek, cited by Fox Business, called the size of the moves outsized.

Friday brought a partial rebound. The iShares Semiconductor ETF rose 4.9% shortly after the open, with AMD up 11% and CoreWeave up 7.5%, Investing.com reported. Asia did not bounce: South Korea's Kospi closed more than 6% lower and SK Hynix fell more than 10%. October job growth came in well above forecasts, and the 10-year Treasury yield edged up to 4.88%, no help to debt-funded builders.

Earnings offered little comfort. At Qualcomm, phone-chip revenue fell 26% to $5.14 billion and the stock closed down 9.5% Thursday. Its data center business, the growth story, is expected to bring in about $650 million this quarter, against a $5 billion target for fiscal 2027. Morgan Stanley analysts said they lack conviction in that ramp.

The next hard data point is CoreWeave's third-quarter report on Tuesday, Nov. 10. It is the first chance to hear a debt-funded AI cloud say whether customers are delaying contracts or permits are slipping.

Bulls point to AMD chief executive Lisa Su, who has said demand still exceeds supply. Thursday's split suggests investors no longer doubt the orders. They doubt how many of those chips can be plugged in on time, and they are betting the suppliers, not the buyers, will pay for any delay.