Midterm Elections and the Stock Market: What 2026 Did and What History Says

Democrats won the House and the Senate on Nov. 3. Stocks ripped on Wednesday and gave it all back on Thursday, when AI, chip and data-center names cracked. Below: what happened, which sectors moved and why, what history says, and how I'd trade a week like this. Market data runs through the Friday, Nov. 6 close.

Quick Answer

What Happened in the 2026 Midterms?

Democrats flipped seven Senate seats and took the House. As of Nov. 8, AP had the Senate at 54 to 44 with Alaska and Mississippi uncalled, and the House at 254 to 162 with 19 races uncalled (via Yahoo News's live blog). A House majority is 218.

Six of the seven flips came in states Trump won in 2024, five of them by more than 10 points (the New York Times). North Carolina was closer, about 3 points. Maine is the exception: Harris won it by about seven.

Neither majority is filibuster-proof or veto-proof. Winning both uncalled Senate races gets Democrats to 56, short of the 60 votes that end a filibuster and the 67 that override a veto. Even with every uncalled House seat, they'd be short of the 290 needed there.

Democrats also flipped governor's offices in Georgia (Keisha Lance Bottoms), Ohio (Amy Acton), Iowa (Rob Sand) and Texas, where Gina Hinojosa beat Gov. Greg Abbott (AP). Trump said he was "a little bit surprised" and would be "Mr. Veto," and that he's willing to work with Democrats (ABC News). The new Congress convenes Jan. 3, 2027 (FOX 35).

How Did the Stock Market React to the Midterm Results?

Wednesday, Nov. 4 was a relief rally. The S&P 500 gained 1.6% to 7,688.62 and the Dow jumped 1,569.40 points, about 3% (AP). CNN, citing CFRA Research, called it the Dow's biggest post-midterm day since 1982 and its best day since April 2025. Brent crude fell 8.7% on the possibility of pressure to pull back on the Iran war (AP), and the 10-year yield slipped to 4.88% from 4.95%. Gold rose too, per U.S. Bank. Annex Wealth Management's Brian Jacobsen summed it up for AP: "Earnings trump elections." That was day one.

Wall Street had flagged one risk in a Democratic sweep. Before the vote, JPMorgan put that outcome at 66%, using prediction-market odds (investingLive). It warned a sweep could hit AI stocks if it meant tighter data-center rules, and penciled in -0.25% to +0.50% for the S&P 500. Day one beat that range. Day two priced the warning.

On Thursday the S&P 500 fell 4.4% to 7,353.73, its worst day since the April 2025 "Liberation Day" tariffs. The Nasdaq fell 5.5% and closed 11.9% below its October record, in correction territory (AP). Nvidia lost 9.3% and AMD 17.3%. AP blamed worries that higher borrowing costs slow data-center construction, AI-bubble critics, a higher chance of government pauses on new data centers, voter wariness about AI and power bills, and the Iran war.

Friday bounced a little, but the S&P 500 still lost 2.7% on the week, its worst week since June (Yahoo Finance). The Nasdaq fell most because it leans hardest on tech (more on how the S&P 500, Dow and Nasdaq differ). Russell 2000 and weekly figures come from La Nación's AP tables for Wednesday, Thursday and Friday.

Which Sectors Moved After the Election, and Why?

U.S. Bank's Nov. 5 note lists health care providers, insurers and renewables as possible winners under a Democratic Congress, and defense spending and parts of the data-center buildout as things that could be slowed. Wednesday's moves mostly matched, except that data-center landlords rose.

Sources: AP (Wednesday, Thursday), Nasdaq.com data via Energy News Beat (power, REITs, big tech), Yahoo Finance (Vistra), Trefis (Centene, Bernstein), CBS (Trump Media on Thursday), Fidelity (Timmer) and Al Jazeera (Ives).

The odd part was the AI trade splitting on Wednesday. Texas power producers fell hard while data-center landlords and the biggest cloud companies rose. On Thursday the AI names sold together, with chipmakers among the worst hit. Over longer stretches, sector leadership is "far less tied to politics than many assume," per BlackRock.

Are Anti-Data-Center Winners a Real Risk for AI and Power Stocks?

The data-center risk for AI and power stocks runs through state permitting once the new governors take office in January, since federal limits face a Trump veto. CBS exit polls found majorities in all the Senate battlegrounds opposed building one in their community. Voters went against data centers in 40 of 41 local ballot measures across 10 states, with Harwood, North Dakota the exception (CNBC, with Ballotpedia), and two were still being counted on Nov. 7 (Al Jazeera). Several winners ran on limits:

• Hinojosa
  Texas governor. Promised a moratorium on new data-center approvals (Yahoo Finance).
• Bottoms
  Georgia governor. Plans a temporary moratorium by executive order, "roughly one to six months or longer," mostly on future projects (WRDW).
• Acton
  Ohio governor. A "conditional moratorium" where operators pay for their own power and water, among other terms (Signal Ohio).
• Andrews
  South Carolina Senate. Called for a two-year statewide moratorium (WRDW).
• Talarico
  Texas Senate. Wants closed-loop water systems and operators funding local infrastructure (Al Jazeera).
• Brown
  Ohio Senate. Ran against data-center tax breaks and against households paying data centers' power costs (Newsweek).
• Georgia PSC
  Democrats won a 3-2 majority on the utility commission, a first in 30 years, and plan to review how data-center costs are allocated (Atlanta News First).

After the vote, Sen. Bernie Sanders posted "National data center moratorium now" (Political.org), which also reports Democrats are split on a blanket freeze.

A federal bill needs Trump's signature or a veto override, and Democrats are short of 60 and 67 Senate votes. Trump has called data centers "GOLD" (Yahoo News live blog). A governor's executive order or a utility commission vote doesn't need Congress.

Goldman Sachs estimates states likely to tighten rules hold about 45% of planned US capacity, Texas alone about a quarter, and expects the curbs to be short-lived. UBS puts roughly 30% of planned 2028 US capacity additions at risk (Reuters, via Al Jazeera). I won't guess which estimate holds. The dates are what you can trade around: nothing from the new Congress before Jan. 3, state action from inauguration day, and Dec. 11, when government funding runs out (Fortune).

How Do Midterm Elections Usually Affect the Stock Market?

Midterm years tend to be weak for stocks, and the 12 months after them strong. Pepperstone counts the S&P 500 higher 12 months after all 19 midterms since 1950, Capital Group gets 15.4% from Election Day, and Motley Fool, going back to 1874 with dividends, counts 32 of 38 positive. The usual explanation is that policy uncertainty fades once the vote is in, which Pepperstone calls plausible but unproven. Each row below uses its own source's base, so don't mix them.

More sources: The Trading Tools, BlackRock, U.S. Bank, JPMorgan, WealthManagement.com and RBC. The usual shape is a weak, choppy midterm year (the drawdowns are what volatility looks like on a chart), softest through September, then a rally into and after the vote. On the four-year presidential cycle the midterm year is the weakest and the year after it the strongest, at 16.3% on JPMorgan's CFRA data (Dec. 1944 to Sept. 2026), 17.2% on Pepperstone's (1951-2023) and 14.0% on RBC's (since 1932). The president's party almost always loses seats, and 2026 fit that. The weak year didn't: Fidelity had the S&P 500 up more than 11% for the year as of Oct. 23, about 2% below its Oct. 6 record. The Trading Tools found years starting within 5% of a high still rose, with a 12.4% median against 17.5% after a deeper fall.

The streak has holes before 1950. Motley Fool's 32 of 38 leaves six down years, the worst of them 1902, 1906 and 1930, and Pepperstone and The Trading Tools have 1938 down. Fidelity counts from 1938, so that year is the one miss in its window, 21 of 22, which matches its "95% of the time". Most of the gain comes at six to 12 months, and the first weeks are noisy. In 2018 the S&P 500 rose 2.1% the day after the vote, was 2.2% lower a month later and ended the year down 6.2% (WealthManagement.com). In 2022 it fell 2.1% the day after, rose 5.5% the next day and was up 14.5% a year out (Pepperstone).

Mind the sample: 19 midterms since 1950, 38 since 1874, and a few outliers move every average. Nearly every source says earnings, rates, inflation and recessions matter more than the result, and the broker and bank pages end on the same advice: don't rearrange a long-term portfolio around an election. For 12-month money the data backs that. It says much less about next week.

Does It Matter Which Party Controls Congress?

Party control of Congress isn't a reliable stock signal. The sources disagree and the samples are small. Motley Fool has divided government at 16% over the next 12 months (23 cases) against 12% for unified government (15 cases), and 18% for divided government under a Republican president (14 cases). Pepperstone finds 15.1% divided against 15.0% unified and calls the samples too small for firm conclusions.

The sources that isolate 2026's setup, a Republican president with Democrats running both chambers, lean weaker. Carson Investment Research puts the S&P 500 at about 4.9% a year under it since the early 1950s, against about 14% with a split Congress (via WealthManagement.com). Those are annual returns, not post-midterm windows. U.S. Bank, using three-month S&P 500 returns since January 1948, has the setup at 1.19%, 1.08 points below average, and finds the one-party vs mixed gap not statistically significant. It describes the Democratic win as "changing the policy outlook but not providing a reliable stock market signal." RBC's Lori Calvasina told Bloomberg the track record "is not as good." Both camps can be right. "Divided government" lumps a split Congress in with an opposing-party Congress, and the subgroups are tiny.

How Should a Day Trader Handle Post-Election Volatility?

Treat the post-election reaction day's range as the line, wait a session for confirmation, and cut size while volatility runs hot. The stay-invested advice is right for long-term money. This is for the next few sessions, on a name that moved on the result, like a power producer or a chip stock. If you trade stocks in play, a week like this hands you plenty.

• 1. Law vs news
  Separate the headline from what can pass, and when. Federal limits face a veto, and state pauses start when governors take office in January. A headline this week doesn't change a permit this week.
• 2. Day one
  Don't trust day one. The S&P 500's Nov. 4 gain was gone by the Nov. 5 close, below Tuesday's 7,568.92. Let the next session show whether a drop like Thursday's in chips is a dip or a falling knife.
• 3. Range
  Mark the reaction day's high and low. The next sessions get judged against them, and a reclaim or a loss of that range says more than the next headline. If the stock gapped, check which kinds of gaps tend to fill before you lean on the open.
• 4. Size
  Size down when volatility jumps. The VIX rose as much as 70% on Nov. 5 (Yahoo Finance). Set stops off average true range so a normal swing doesn't take you out, then cut the share count so the dollar risk stays the same, as in these day trading risk rules.
• 5. Calendar
  Check for earnings before calling a move political. Vistra fell about 14% on Nov. 4 on its Texas exposure, then rose on its Nov. 6 earnings report. AppLovin gained 31% on earnings during Thursday's selloff (AP).

To be plain, since I build it: SnapPChart reads one static screenshot (trend and structure, moving averages, VWAP, MACD, volume, and support and resistance as ranges). It has no news feed, election data or fundamentals, and no gap or election signal. The AI chart analysis page lists what it reads, and the guide to AI trading tools covers where a chart read fits next to the news.