09/07/2026
Which month historically gives the S&P 500 its biggest headache?
If you said October, think again!
Although October has a reputation for market events, September is actually the month that's experienced more downturns.
September finishes higher less than half the time (historically around 44 percent).
There are theories behind it.
Institutions often rebalance their portfolios at the end of the third quarter, adding to the volatility.
Traders return from a slower summer, which can shake up trading.
And the federal government's fiscal year ends September 30, so budget uncertainty also tends to land in September.
Did you already know this? Or is this new news?
The S&P 500 is an unmanaged index that is considered representative of the U.S. stock market. Index performance is not indicative of the past performance of a particular investment. Past performance does not guarantee future results. Individuals cannot invest directly in an index.