Seasonal Odds Favor S&P 500 Gains Next Week (May 2–9) | Wayne Whaley

The S&P 500’s performance during the week of May 2–9 (Sat-Sat) has historically been fairly neutral over the past 51 years, posting 28 advances and 23 declines for an average gain of just 0.09%. 

 

» Seasonal evidence alongside recent momentum points modestly in favor of higher prices over the coming week. «

 

► 51-year May 2–9 performance: mostly neutral (+0.09% avg; 28 up / 23 down)
► Overall seasonal and momentum bias: modestly bullish for next week
► First half of May often mirrors first half of April behavior
► 2026 April (Apr 1–16): strong +7.09% advance
► Strong April (>1.68%) historically: 15 up / 2 down in following week

► Weak April (<-0.45%) historically: 6 up / 11 down in following week
► Closest strong April cases (2009, 2020) saw +5.89% and +3.50% gains

 

However, a broader set of seasonal studies suggests that stronger recent price trends tend to support continuation, implying a bias toward further gains in the coming week. Notably, the first half of May has often behaved similarly to the first half of April, reinforcing the relevance of the recent April setup.

In the data breakdown, May 2–9 returns are grouped into three 17-year categories based on the S&P’s performance from April 1–16 over the same 51-year history. In 2026, the index rose 7.09% during that April window. In the 17 prior instances where April 1–16 gains exceeded 1.68%, the S&P advanced in 15 of the following May 2–9 periods versus only 2 declines. By contrast, when April 1–16 was weaker than –0.45%, the next-week record flipped to 6 up and 11 down. More specifically, in the two historical cases most comparable to 2026—2009 and 2020, both with April gains above 5%—the S&P followed with strong May 2–9 advances of 5.89% and 3.50%, respectively.

The accompanying ratings system scales outcomes into -3 to +3 standard deviation bands on a -100 to +100 framework, with outliers down-weighted to better reflect typical behavior; readings below -50 or above +50 are treated as trade-alert conditions. While multiple non-seasonal factors can certainly influence market behavior, the combined seasonal evidence alongside recent momentum points modestly in favor of higher prices over the coming week.

Reference:

Wayne Whaley (May 2, 2026) - Whaley-AI analysis of the seasonal odds for the S&P next week (May 2–9).

 

S&P performance after a 10% calendar month: "For me, from a directional signal perspective, it is a bull friendly development but more so because it occurred in the barometrically important month of April than the fact that it was a rare double digit month."

See also:

Jeffrey A. Hirsch (May 1, 2026) - May Stock Market Performance in Midterm Election Years.

17-0 Turn-of-Year S&P 500 Setup with 7.1% Average Gain | Wayne Whaley

After the 20% pullback in the S&P 500 that occurred from February 19 to April 8, May, June, and July each posted positive returns of 6.2%, 5.0%, and 2.1%, respectively. In the 75 years following 1950, there have only been 17 instances in which the traditional "Sell in May and Go Away" period was marked by three consecutive positive months (May, June, and July): 

 From October 12 to October 27, the performance was 2 wins to 15 losses, with an average loss of 3.0%.

From October 27 to January 18, the record was 17-0, with an average gain of 7.1%.

 

Looking at the following 12 months, from August through July, the outcome was favorable, with a record of 14 wins and 3 losses in this setup. The average gain over this period was 12.6%, compared to a more typical yearly gain of 9.5%.

Interestingly, the only negative month during the following year was October. Specifically, from October 12 to October 27, the performance was 2 wins to 15 losses, with an average loss of 3.0%. However, from October 27 to January 18, the trend reversed dramatically, posting a perfect 17-0 record with an average gain of 7.1% over 11.7 weeks.

Wayne Whaley,
August 2, 2025.

See also:
Wayne Whaley (May 17, 2025)  - "Three Day Whaley" Predicting 20% Average Annual Return.

"Three Day Whaley" Predicting 20% Average Annual Return | Wayne Whaley

When the S&P 500 experiences a one-day upside move of three standard deviations or more, there is often a tendency for the index to undergo some level of profit-taking (consolidation) over the next couple of days. However, if the index defies this tendency and follows the initial surge with two consecutive positive days, it signals strength. This pattern, known as the "Three Day Whaley," is a notable market move deserving of attention.

 The "Three Day Whaley" signal has a perfect 30-0 record since 1950

for predicting positive annual returns averaging 20.2%.

Volatility has increased over the past 75 years. The setup for this pattern requires the S&P to post a move on Day 1 that reflects the volatility during that specific period, followed by two consecutive positive days. The threshold for that initial move has evolved from around 2.25% in 1950 to 3.25% in 2025.

On May 12-14, the S&P met the criteria for this setup with a three-day sequence of 3.25%, 0.76%, and 0.10%—its first occurrence since March 26, 2020, which was followed by a 50.55% annual gain.

Since 1950, the S&P has gone 30-0 in the year following this setup, with an average annual gain of 20.2%. All 30 instances have seen at least a 7.5% gain, and only four of the 30 cases experienced a double-digit drawdown. The first-day threshold requirement can be found in column 3 (DAY1 THHLD) in the table above.

Reference:
Wayne Whaley (May 17, 2025)  - A 30-0 Three Day Whaley.

See also:

Paul Ciana (May 17, 2025)  - S&P 500 on Track for Strongest May-to-July Gains in Years.

Ryan Detrick (May 16, 2025) - S&P 500: More Good News for Bulls.