The Midterms Land Tuesday. Here Is What Market History Actually Says About Elections and Your Portfolio

It is the first weekend of November 2026, and two very different stories are pulling at investors. One is a rough stretch for technology shares, driven by fresh questions about how much companies are spending to build artificial intelligence and how quickly that spending will pay off. The other is Tuesday's midterm election, which will decide the balance of power in Congress. Both land in the same crowded week, alongside earnings from Apple and AMD and the October jobs report due Friday.

Election weeks reliably produce a flood of market predictions. The useful move is to separate what the historical record actually shows from what commentary wishes it showed. The record is clearer, and calmer, than most headlines suggest.

Here is the setup. Election Day is Tuesday, November 3, 2026. Every seat in the House and roughly a third of the Senate are on the ballot, and forecasters describe control of Congress as closely contested. Markets care about this because the balance of power shapes what kinds of tax, spending, and regulatory changes are realistic over the next two years. That matters. But as the data below shows, it tends to matter less than investors fear in the heat of the moment.

Start with the single most repeated pattern. According to Fidelity, the S&P 500 has posted price gains in the 12 months following midterm elections about 95 percent of the time going back to 1938, with an average gain of roughly 14 percent over that stretch. That is a strikingly consistent record. It is also widely misread, so it is worth unpacking what is really going on.

The pattern is not that elections are good for stocks. It is that uncertainty is bad for stocks, and elections resolve uncertainty. The months leading into a midterm have historically been weaker and choppier than average, as investors sit on their hands waiting to see who controls what. Once the results are known, that fog lifts, and the market tends to rebound regardless of who won. The calendar, in other words, is doing a lot of the work that gets credited to any particular outcome.

The averages also hide enormous range. Fidelity notes that returns in midterm years themselves have run from a drawdown of about 27 percent to a gain of nearly 40 percent. An average near 14 percent in the following year is a center of gravity, not a promise. Reading it as a forecast for any specific 12 months, including the stretch after this Tuesday, is exactly the mistake the history warns against.

The chart above places two different Fidelity figures side by side, and the labels matter as much as the bars. The roughly 5 percent reading is the average return in the second year of a presidential term, the midterm year, measured since 1950. The roughly 14 percent reading is the average return in the 12 months following the midterm election, measured since 1938 rather than over a calendar year. Because the two numbers come from different sample periods and different measurement windows, they are best read as complementary observations, not as a clean before-and-after of the same series. The broad shape of the story still holds: the stretch before a midterm has tended to be soft, and the stretch after it has tended to be stronger. That does not mean the gap will repeat this cycle. It means the lead-up volatility many investors are feeling right now is normal, not a signal that something is broken.

What about which party wins, or whether one party controls everything? Here the evidence is more nuanced than the usual talking points. An analysis from The Motley Fool that looks at midterm elections going back to 1874 found that the 12 months after a midterm averaged about 16 percent when government was divided, with the White House and at least one chamber of Congress held by opposing parties, versus about 12 percent when one party held unified control. Positive returns showed up 91 percent of the time under divided government and 73 percent of the time under unified government across that long record. So divided government has historically coincided with somewhat stronger average returns, a pattern some observers tie to the lower odds of sweeping legislative change under gridlock. Two cautions apply. The samples behind these splits are small, so the averages are rough tendencies rather than rules. And the larger lesson across every slice of this data is the same: economic growth and corporate earnings have driven returns far more than the party in control.

This year adds its own twist. Midterm years have historically been the weakest leg of the four-year presidential cycle, yet 2026 broke that script. As of October 23, the S&P 500 was up more than 11 percent for the year and sat only about 2 percent below the record close it set on October 6, per Fidelity. In other words, the market did not deliver the typical pre-election slump this time. That is a useful caution in both directions: history is a guide to tendencies, not a script that reliably runs on schedule.

So what is actually moving stocks right now? Mostly the same forces that move them in any week. The recent pressure on technology shares has been about AI capital spending and free cash flow, not ballots. Big cloud companies are pouring money into data centers, and investors are debating whether those outlays will generate durable returns. That debate, plus Friday's jobs report and the Federal Reserve's path on interest rates, is likely to matter more for your portfolio over the next year than the seat count in Congress. As CNBC has noted, the election shares the calendar this week with earnings and labor data, so no single catalyst gets to dominate the tape.

None of this is a reason to ignore the election or to trade around it. It is a reason to keep it in proportion. The most common mistake investors make around elections is turning a political conviction into a portfolio bet, then paying for it twice when the market does not follow the script. The sector-by-party playbooks that circulate every cycle have a weak track record precisely because market leadership rarely follows a party line.

A plan written in advance is the best defense against election-week impulses. If you do not have one, the simplest version is a short investment policy statement that spells out your target mix, how often you rebalance, and what you will not do when markets get loud. The point is to make your decisions on a quiet day so you are not improvising on a loud one.

The quiet-day math is also where the real money is made. The chart below lets you see how steady contributions can compound over time, which is the mechanism that rewards investors for staying in their seats through cycles like this one rather than jumping out before an election and trying to time a way back in.

The bottom line for this week is modest on purpose. History suggests the volatility around a midterm is normal, that the year after has usually been positive, that the composition of government has shown some patterns but has mattered less than the business cycle, and that averages conceal a wide range of real outcomes. Tuesday's result will reshape Washington. Whether it reshapes your financial plan is a separate question, and for most long-term investors the honest answer is that it should not. Keep contributing, keep your mix where you want it, and judge companies on earnings and cash flow rather than on who is standing at the podium.