Sanders Called for a National Data Center Ban; the S&P 500 Fell 4.4%

On the first day after the election, Wall Street moved money out of chipmakers and into the big cloud companies. On the second day, there was nowhere left to hide. The S&P 500 closed Thursday down 4.4% and the Nasdaq Composite down 5.5%; the Dow lost more than 1,800 points.

According to AP, it was the S&P 500's sharpest drop since the April 2025 tariff shock. The Philadelphia Semiconductor Index traded down around 11% near the close, heading for its worst day since March 2020.

The trigger was a social media post. Senator Bernie Sanders wrote that he and Alexandria Ocasio-Cortez introduced a data center moratorium seven months ago. On election night, he added, 43 of 44 communities voted for a local one. The post ended in capitals: "NATIONAL DATA CENTER MORATORIUM NOW"

The Rotation Turned Into a Broad Selloff on Day Two

On November 4 the picture had split in two. The S&P 500 rose 1.6% while the chip index fell 3.1%, with Microsoft and Amazon among the gainers. The read was simple: if data center spending slows, the spender wins and the seller loses.

On Thursday that split collapsed. Yahoo Finance's midday data showed Microsoft, Amazon and Alphabet each losing $140B to $170B in market value. Fortune put the total loss for U.S. stocks at roughly $3T.

The stock moves are Fortune's figures at 3:41 p.m. ET; the indexes are closing levels. AMD and Micron fell about 15%, and Nvidia about 9%. Vanda Research data cited by Yahoo Finance showed retail investors net selling $358M by 2:58 p.m., the biggest single-day selling since March 17, 2020.

What Sanders Wants Versus What He Can Do

The legal vehicle for the call has existed since March. According to an AP report dated March 25, the Sanders and Ocasio-Cortez bill would pause new data centers in the U.S. until national safeguards are in place. AP wrote at the time that the bill was not expected to advance in either chamber.

The distinction in tense matters here. Sanders' post is a demand and the bill is an intention; neither is binding. The new Congress convenes on January 3, every bill still goes to Trump for signature, and Trump's term runs until January 2029.

The binding tools sit with states and towns. Local bans approved on election night take effect. Texas's new governor, Gina Hinojosa, has said she will halt all data center approvals until laws are passed, and she takes office on January 19.

The 2028 Capacity Math

The market did not read this call as a political story. It read it as an order book story.

In a November 4 J.P. Morgan note reported by StockTitan, Michael Cembalest wrote that 75% of the 37 gigawatts due in 2027 is already under construction. The new governors' limits do not touch that year; the risk gathers in the following one.

The last line is what matters to a chipmaker. Chips for a building are ordered months before the building is connected to power. A slip in 2028 capacity therefore shows up in 2027 orders and cuts the growth rate that today's valuations rest on.

The chart counts three months back from today; Thursday's loss is the sharpest day in a slide that began at the October peak. Per AP's intraday data, the Nasdaq Composite fell to 11% below the record it set last month.

The Part That Doesn't Fit

Not every signal points the same way. The 10-year Treasury yield eased from 4.90% to 4.84%, so the market priced the fear as a growth risk rather than a rate shock. AppLovin, meanwhile, rose 29% per AP's intraday data after strong earnings.

The industry also stepped back. OpenAI published a compact the same day that gives local communities a say and commits it to covering its own energy costs. Not every Democrat backs a national ban either; Senator John Fetterman opposed the idea in March.

What It Means for Investors

• The market priced a slip in 2028 capacity; it did not price, or did not trust, the fact that 75% of 2027 is already under construction.
• The most exposed stocks are chip and equipment makers whose orders depend on growth, plus Texas power producers; cloud companies lost their rotation cushion on day two.
• Watch the new Congress on January 3 and Texas's new governor after January 19; an executive order from Hinojosa would make the 2028 risk concrete.
• The risk to this thesis: if local bans push capacity into other states, total gigawatts may not change, only their location.

This story relies on AP's November 5 closing report and its March 25 report on the bill. Intraday stock losses are Fortune's figures at 3:41 p.m. ET. J.P. Morgan's capacity math comes from StockTitan's report, and the retail data from Vanda Research as cited by Yahoo Finance. Sanders' post was confirmed through CNBC's report; exact closing moves for some stocks could not be verified at publication.