Citi: Outsized Earnings-Day Moves in U.S. Stocks Have Become the New Normal
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Citi data show the number of S&P 500 stocks swinging more than 10% on earnings day has surged from the usual 10–20 per quarter to 30–60, turning each report into a make-or-break repricing event in a high-valuation market.
Why have earnings-day swings gotten so much bigger?
Citi found that since 2024 the number of S&P 500 members moving more than 10% on earnings day has jumped to 30–40 in several quarters — and topped 60 in Q1 this year.
The prior decade's norm was just 10–20 per quarter.
This means → earnings releases have shifted from routine check-ins to high-stakes repricing moments.
Nationwide chief market strategist Mark Hackett points to the core driver: elevated overall valuations leave the market unable to judge whether prices are justified until it sees real numbers.
Where did the "safety cushion" go?
Historically, analysts lower earnings estimates ahead of reporting season, giving companies an easy bar to beat — the so-called safety cushion.
This time the opposite happened: FactSet data show bottom-up EPS estimates for the S&P 500 rose 3.4% between March 31 and June 30. The five-year average for the same window is a 2% cut; the ten-year average, a 2.7% cut.
In plain terms = the exam got harder, not easier — "beating expectations" is now a genuinely difficult task.
Ameriprise chief market strategist Anthony Saglimbene says the market now cares more about full-year guidance and margin durability than whether a company edges past a single quarter's consensus.
The headline growth numbers look strong — are they?
Analysts forecast S&P 500 Q2 EPS growth of 23.3% year-over-year, up from the 18.8% expected at end-March. Revenue is projected to rise 12.2%.
If delivered, this would mark a second straight quarter of 20%+ earnings growth and the fastest revenue expansion since Q2 2022.
This means → the raw numbers are impressive, but precisely because the bar has been raised, any shortfall will be punished.
Same "beat" — so why did some stocks rally and others sell off?
Samsung Electronics posted operating profit up roughly 19-fold year-over-year and beat expectations, yet the stock fell 7% in a single day.
PepsiCo topped revenue estimates but still dropped 3.3%.
The contrast: Micron Technology reported a beat with strong guidance and surged over 16%, its best-ever earnings-day performance.
This reflects a market no longer satisfied by the "beat" label alone — earnings quality, forward guidance, and valuation fit are the real variables driving the move.
What should investors watch next?
Saglimbene argues companies must prove three things at once: margins are solid, full-year guidance is intact, and profit growth is broadening beyond a few names — only then will the market reward a higher multiple.
Hackett adds a relatively positive note: unlike some prior seasons that opened after a sustained rally, the S&P 500 has been range-bound since mid-May, meaning less euphoria has been priced in and more room exists for upside surprises.
In plain terms = the defining question of this earnings season is whether profit growth can spread from a handful of AI and tech leaders to the broader market — that is the test that matters most.
Content is for reference only, not financial advice.