U.S. Stocks' Q4 Seasonal Strength Faces Dual Test from Surging Bond Yields and Earnings Season
nashnova research
The S&P 500 sits within 2% of its all-time high, but the 10-year Treasury yield just hit 5.34% — a 24-year peak — putting the historically strongest quarter under a triple test of yields, earnings, and midterm elections.
Why have bond yields become the biggest headwind?
The 10-year U.S. Treasury yield touched 5.34% on Thursday, the highest in nearly 24 years.
Three forces are driving it: strong growth expectations, energy costs stoking inflation, and heavy corporate bond issuance to fund AI expansion — intensifying capital competition.
This means → rising yields do two things at once: compress equity valuations and raise borrowing costs across the entire economy. In plain terms = the risk-free return just got more attractive, so the case for parking money in bonds strengthens and the pull toward stocks weakens.
Horizon Investment Services CEO Chuck Carlson put it bluntly: "Interest rates are the biggest headwind. It's going to be a tough struggle to get any meaningful rally."
Q4 has an 85% historical win rate — can investors still trust it?
CFRA data going back to 1945 show the S&P 500 gains an average of 4.2% in Q4, with an 85% probability of finishing up — more than double the average gain of any other quarter.
Midterm-election years are even stronger: Q4 averages a 6.4% gain. CFRA chief investment strategist Sam Stovall attributes this to the "relief rally once election uncertainty clears."
But midterm years overall tend to be weak, with an average S&P 500 drawdown of about 15%; the 2026 maximum decline so far is only about 9%. This reflects a gap that hasn't closed — pre-election downside room may remain.
Midterms versus the Fed — which wild card is harder to read?
Wells Fargo global asset allocation strategist Tracie McMillion says her team is on "high alert" for a pre-election pullback — a Democratic sweep of both chambers could trigger policy-driven market jitters.
She adds, however, that such a pullback could present a buying opportunity.
The Fed raised rates last month for the first time in three years to fight inflation. Minutes from that meeting drop Wednesday; markets will scour them for clues on another hike in October or December. This means → rate-path uncertainty won't fade soon, and bond yields still face upward pressure.
Earnings season is here — what is the market really watching?
PepsiCo and Delta Air Lines report Q3 results next week, followed by the major banks kicking off the full earnings season.
IBES data project S&P 500 Q3 earnings growth of over 30% year-on-year — an impressive headline, but the high base means the market's tolerance for misses has narrowed sharply. In plain terms = 30% growth sounds great, but if the market has already priced it in, even a slight miss gets punished.
Capital spending by AI hyperscale data-center operators is the season's core focus — that spending both drives the current earnings beat and anchors market expectations for future growth. Whether yields pull back materially during earnings season will largely determine if Q4's seasonal strength can deliver as history suggests.
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