S&P 500 Has Never Fallen in the 12 Months After a Midterm — Will 2026 Repeat It?

Wall Street's fear gauge was on track Wednesday for its biggest daily percentage-point drop since April 9, 2025, as markets rallied following the Democrats' sweep of the House, Senate and governorships in the 2026 midterms.

Stock futures dipped overnight, but major indexes came roaring back after the opening bell. Many on Wall Street had framed the election as a "clearing event" for risk. Some investors credited expectations that Democrats might roll back some of President Donald Trump's tariffs, particularly the aggressive levies on Canadian goods. Others said investors were simply relieved the vote was over after weeks of uncertainty.

Beyond the immediate relief rally, Democratic control of the House and Senate — plus governor's mansions in Texas, Ohio and other reliably red states — could reshape markets as Washington's policy priorities shift. Four issues stand out.

What does the blue sweep mean for the price of compute?

Opposition to new data-center construction proved a potent motivator for voters, and a slower pace of development should raise the cost of computing power.

"All else equal, this new environment should increase the cost of compute and is positive for the current owners of data-center capacity," said Warren Pies, founder of 3Fourteen Research, who correctly anticipated Tuesday night's "blunami" outcome.

The winners and losers split along market-cap lines. The so-called hyperscalers — the megacap technology firms at the center of the AI boom — should benefit, because constraining the supply of computing power needed to train AI models lifts revenues for their cloud businesses. Smaller challengers, including "neoclouds" like CoreWeave (CRWV) that rent out capacity, face a much tougher road.

The sweep also raises questions about whether semiconductor companies like Nvidia (NVDA) and Micron Technology (MU) can hit the lofty revenue targets embedded in Wall Street's 2027 earnings forecasts.

"Our modeling suggests that even a modest slowdown in data-center pacing will cause semi revenues to undershoot the estimates," Pies added.

The split was already visible Wednesday. Shares of Alphabet (GOOGL), Microsoft (MSFT), Meta Platforms (META) and Amazon (AMZN) — the four main hyperscalers — rose, while semiconductor, neocloud and AI-buildout industrial stocks fell.

How does the election change the Fed outlook?

Treasury yields were declining Wednesday as bond traders weighed both the election and the Treasury Department's latest quarterly refunding announcement, in which Secretary Scott Bessent again signaled cuts to issuance of longer-dated notes and bonds.

Interest-rate futures traders still expect another Fed rate hike in December, according to CME Group data. But trading action suggested the case for further hikes in 2027 looked more tenuous.

A Democratic-controlled Senate should also act as a firewall for the Fed, blocking Trump from installing loyalists on the board of governors if a vacancy arises, strategists at Rabobank said.

"There is only one governor whose term is set to end in the next two years — [former Fed Chair Jerome] Powell's tenure as Fed governor will conclude in January 2028," said Michael Feroli, an economist at J.P. Morgan.

What about fiscal deadlines and the debt ceiling?

Divided government makes gridlock the norm again for Washington's policymakers. Jonathan Pringle at UBS expects spending negotiations to grow more fractious in 2027, which could spark short-lived volatility as the Dec. 11 deadline for a new spending package approaches.

Republicans and Democrats will likely clash over the debt ceiling too, though Pringle doesn't expect another deal to raise the federal borrowing limit until the second half of next year.

Federal deficits probably won't shrink. Pringle expects deficits to run at around 6.5% of GDP in the years ahead as Democrats seek to water down or delay cuts to nutritional assistance and healthcare subsidies passed in Trump's 2025 budget bill. The fiscal impulse on GDP growth could diminish somewhat in 2027, but Pringle sees that as more of a 2028 story.

Will the post-midterm rally pattern hold?

History is on investors' side. Tom Essaye, founder and president of Sevens Report Research, supplied the record:

• Since 1950, November has been the S&P 500's second-best month in midterm years, up an average of 2.7% and higher 79% of the time.
• The three quarters after elections — Q4 of the midterm year plus Q1 and Q2 of the following year — have the strongest returns of the entire electoral cycle.
• From 1930 to 2026, the S&P 500 never declined in the 12 months after a midterm, averaging 14% — well above its historical annual return of 10.5%.

Pies cautions that seasonality isn't the only issue. The bigger question, he said, is whether the tech sector takes a slowdown of the AI buildout in stride — the variable most likely to decide whether 2026's post-midterm streak survives contact with earnings season.