CNBC’s S&P 500 Midterm Record
CNBC published its S&P 500 election analysis on 2026-11-02, ahead of the midterm elections, and the investor takeaway is constructive but conditional: the historical signal becomes much stronger over one year than over the first day, week or month.
The study covers S&P 500 returns following U.S. presidential and midterm elections from 1980 through 2024. An election-return analysis measures how the index performed over specified intervals after an election; it describes the historical record rather than predicting the next result.
That distinction matters for an index market whose next direction remains unknown. The data establish a favorable long-horizon pattern, but they do not establish the outcome of the upcoming midterms, whether Democrats will control either house of Congress, or how the S&P 500 will perform afterward.
Why the One-Year Horizon Carries the Strongest Signal
CNBC calculated that the S&P 500 gained an average of 0.2% after one day and after one week following presidential and midterm elections from 1980 through 2024. The average advanced to 1.1% after one month, showing that the immediate post-election move was modest relative to the subsequent one-year record.
At the one-year mark, the S&P 500 averaged a 13.7% gain after midterms and a 13.8% gain after presidential elections, according to CNBC. One-year post-election returns were positive in 91% of cases, giving the longer observation window far more weight than a single reaction session.
The midterm record was especially consistent: the S&P 500 rose after all 11 midterms from 1982 through 2022. That result supports a historically bullish reading for the index, not a guaranteed forecast for the next election cycle.
Ryan Detrick, a CNBC contributor and chief market strategist at Carson Group, framed the passage of an election as a release of uncertainty: “Once you are through it, it's a big relief and markets tend to do pretty well.” His observation fits the stronger one-year figures, while the 0.2% short-term average argues against treating the first market move as the full verdict.
Divided Government Produced the Higher Historical Average
The clearest political split in the data concerns whether one party emerged with control. Across 10 midterm elections and 5 presidential elections that left no single party in charge, the S&P 500 gained an average of 15% after one year.
CNBC also found that one-year S&P 500 returns were positive in 14 out of 15 such cases. Elections resulting in single-party control were followed by an average one-year gain of 11.5%, still positive but below the record for elections that produced no single-party control.
Those figures describe two historical groupings; they do not prove that the balance of political power caused the returns. The upcoming election result is unknown, so investors cannot yet place the next observation into either grouping.
A narrower configuration offers another caution against overreading reaction day. Across the 3 midterms in 1986, 1990 and 2006, when Democrats controlled both houses and a Republican held the presidency, the S&P 500 averaged a 0.5% decline on the reaction day. It was up 3.4% after one month and 10.9% after one year.
The Range of Outcomes Behind the Average
Averages compress sharply different paths. The worst S&P 500 post-election performance since 1980 was a 22.1% decline in the year after the 2000 elections, while the best was a 38.3% gain in the year after the 2020 elections.
That spread is the central risk to using election seasonality as a stand-alone market call. A positive average and a high frequency of gains can coexist with a severe negative outcome, so the historical record is better treated as a baseline than as a destination.
The 2018 experience provides another useful stress point without establishing causation. The Federal Reserve raised interest rates 4 times in 2018, and the S&P 500 ended that year with a 6.2% decline; one year after the 2018 election, the index was up 11.7%.
Jim Reid, Deutsche Bank’s global head of macro and thematic research, stated the limitation directly: “Seasonality isn't destiny, and worries around Iran, AI and France won't mysteriously vanish.” The remark separates the election pattern from unresolved risks rather than dismissing the historical evidence.
S&P 500 and Sector Read-Through
- S&P 500: The index is the only market instrument directly supported by the analysis. Its 13.7% average gain one year after midterms and positive returns following all 11 midterms from 1982 through 2022 create a favorable historical bias.
- Technology stocks: Whether declines in technology stocks will continue is unknown. The supplied evidence contains no sector return, company result or valuation measure, so it cannot support a company-specific or sector-specific forecast.
- Federal Reserve sensitivity: The 4 interest-rate increases and 6.2% S&P 500 decline in 2018 belong in the risk ledger. The facts do not establish that the rate increases caused the decline, so the episode should remain context rather than a causal template.
- Political control: No-single-party-control elections carried a 15% average one-year S&P 500 gain, compared with 11.5% after elections producing single-party control. Which historical group will apply cannot be known until the upcoming election outcome is determined.
Bull and Bear Cases for the Post-Midterm Market
Bull case: The S&P 500’s one-year record is broad across election types. Average gains reached 13.7% after midterms and 13.8% after presidential elections, 91% of one-year post-election returns were positive, and every one of the 11 midterms from 1982 through 2022 was followed by an index gain.
A result leaving no single party in charge would place the election in the historical group with a 15% average one-year gain and positive returns in 14 out of 15 cases. This is a conditional comparison because the election outcome and the index’s future return are both unknown.
Bear case: The 22.1% one-year decline after the 2000 elections demonstrates that a favorable pattern does not eliminate drawdown risk. Uncertainty also remains over technology-stock declines and whether the war with Iran will worsen after the election.
The short-horizon figures offer little protection against volatility: the average S&P 500 gain was only 0.2% after one day and one week. A weak initial response would therefore need to be assessed separately from the one-month and one-year history, just as a positive reaction day would not confirm the longer-term pattern.
Investor Checkpoints After the Midterms
- Classify the election outcome: Determine whether the result leaves no single party in charge or produces single-party control before applying the corresponding 15% or 11.5% historical one-year average.
- Separate the time horizons: Compare the S&P 500 response after one day and one week with the 0.2% historical average, then assess the one-month result against the 1.1% average.
- Reassess at one year: The central benchmarks are the 13.7% average after midterms, the 13.8% average after presidential elections and the 91% frequency of positive one-year post-election returns.
- Track unresolved risks: Watch whether technology-stock declines continue and whether the war with Iran worsens. Neither outcome is established by the election history.
What the CNBC Evidence Can and Cannot Answer
The analysis answers a narrow, useful question: how the S&P 500 performed over defined periods following presidential and midterm elections from 1980 through 2024. It shows that the historical pattern was strongest at one year and that elections leaving no single party in charge carried the higher average return.
It cannot determine the upcoming midterm result or the S&P 500’s next return. Chris Hayes contributed reporting to CNBC, and the published record supplies a disciplined baseline: use the election outcome to select the relevant historical comparison, then judge the actual index path at the stated day, week, month and one-year checkpoints.
📊 Analysis
Signal Bullish
Why Historical one-year S&P 500 returns were usually positive after elections, though the record does not determine the result after the upcoming midterms.
This article was independently written by OneDayTrading from public reporting. Read the original (CNBC)
