Although a widely shared JPMorgan chart has set Wall Street chatter buzzing about a fourth-quarter turn, the historical script it describes diverges sharply from what the market has actually delivered this year. As of Thursday, Aug. 20, 2026, the start of Q4 sits 42 days out on the calendar, and JPMorgan Asset Management’s July research shows that in midterm election years, the benchmark S&P 500 has averaged three flat-to-negative quarters before jumping an average of 6.6% in Q4. But 2026 has not delivered the weak prelude the pattern requires, and that mismatch matters.
The SPDR S&P 500 ETF (NYSEARCA:SPY) was trading at $766.58 as of 9:53 a.m. ET on Thursday, Aug. 20, 2026, according to real-time quotes. On the session, the fund was down 0.32% from Wednesday’s close of $769.06. Settled data through Aug. 19 shows the ETF down 0.44% over the past week, up 3.63% over the past month, up 12.78% year to date, and up 20.2% over the trailing year. That profile shows a market advancing, not one grinding sideways in wait of a seasonal rescue.
What the JPMorgan Data Actually Says
The research note, titled “How do markets perform in midterm election years?” and dated July 8, 2026, tallies average quarterly S&P 500 returns across past midterm cycles: Q1 at -0.5%, Q2 at -0.6%, Q3 at -0.1%, and Q4 at +6.6%. JPMorgan’s own framing is direct: “Average returns were slightly negative in each of the three quarters preceding a midterm but then jumped an average of 6.6% in the fourth quarter.” The chart reached wider circulation on Aug. 16, 2026.
These are historical averages across multiple past midterm cycles. They are not a forecast for Q4 2026, and treating the 6.6% figure as an expected return for this quarter would misuse what the underlying data actually shows.
Calendar Math Behind the 42-Day Count
JPMorgan never published a 42-day figure. The count is a straightforward calendar distance from today to the start of Q4 on Oct. 1, 2026. The firm’s stated mechanism ties the seasonal lift to election proximity rather than a quarter boundary: policy and political uncertainty tends to fade as the vote nears, and JPMorgan notes that “markets begin to rally just under a month before election day.” With Election Day on Nov. 3, 2026, that language points to early October, a few days after the calendar-quarter line. The two framings sit close together but are not identical.
There is also tension worth surfacing inside JPMorgan itself. The same firm raised its year-end S&P 500 target to 8,000, citing AI and earnings strength, in coverage reported by Reuters on Aug. 9, 2026 and by CNBC, Bloomberg, Barron’s and Business Insider on Aug. 10, 2026. Its seasonality research describes historically weak pre-Q4 quarters. Its house view for this year is bullish. Both can coexist, but the seasonal template is clearly not what the strategists are leaning on.
Why 2026 Has Not Followed the Script
The historical pattern requires three slightly negative quarters to set up the Q4 pop. 2026 has delivered the opposite. SPY has piled on a 12.78% year-to-date gain through Aug. 19, propelled by AI-driven earnings and megacap concentration. Top holdings include NVIDIA at a 7.58% weight, Apple at 6.66%, and Microsoft at 4.91%. That describes a market already extended, well past the bruised setup the seasonal lift historically rewards.
Recent price action has softened. The ETF is down on the session and down over the past week. The VIX closed at 15.84 on Aug. 18, sitting in what its own interpretation guide labels a normal range but near the complacency threshold. The 10-year Treasury yield sat at 4.71% on Aug. 18, near the year’s high, a less accommodating backdrop for stretched multiples.
Krinsky’s Fragility Window
BTIG chief market technician Jonathan Krinsky has flagged the stretch from mid-August through mid-October in midterm years as, in his characterization, “statistically fragile.” That window sits directly ahead of the Q4 lift JPMorgan’s dataset describes. Both can be true at once. The historical script may include a rough patch before the seasonal turn.
Independent of Krinsky, Wall Street strategists have warned about autumn sell-off risk with the VIX at a year-to-date low, in coverage dated Aug. 17 and Aug. 19, 2026. Goldman Sachs’ 2026 Investment Outlook separately notes that “the US midterms in November 2026 may influence market sentiment, with potential impacts on equities, rates, and the US dollar,” establishing the election calendar as a broadly tracked factor rather than a single-firm thesis.
What to Watch Next
The open question is whether a historical average asserts itself in a year that has not resembled the historical setup. The seasonal pattern was built on cycles where the first three quarters doled out losses. This one has produced sizable gains through mid-August, the kind of extended tape where planning the exit matters as much as staying in (we walk through both halves in a free handbook here: The Bubble Survivor’s Handbook). Long term, the benchmark S&P 500 has kept climbing across decades regardless of the midterm calendar. What the next 42 days will not settle is whether the Q4 average survives contact with a market that already rallied through its own script.
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