Sell in May, Go Away: The Seasonal Panic Returns

The "Sell in May, Go Away" Myth Arrives Right on Schedule

Every year, like clockwork, the same tired narrative resurfaces. "Sell in May and go away," the old Wall Street adage whispers, and by late July the chorus grows louder. August is coming. Batten down the hatches. Dump your positions before the summer swoon eats your gains.

This year the setup is especially seductive. The S&P 500 is flashing sell signals on several technical indicators. Options traders are positioning for sharp moves in Apple, Meta, and Microsoft. An AI-stock pullback has spooked retail accounts that loaded up on momentum names in the first half. And so the seasonal excuse is right there, waiting to be grabbed: "August is historically terrible. I should be in cash."

Before you act on that impulse, look at what the data actually says and what it quietly omits.

Does the Sell in May and Go Away Strategy Actually Work?

The "sell in May and go away" strategy proposes a simple trade: exit equities on May 1, re-enter on November 1, repeat forever. Its appeal is obvious. It reduces your exposure during the statistically weaker May-through-October window and keeps you invested during the historically stronger November-through-April stretch.

On a pure seasonal-return basis, the strategy has a grain of truth. Since 1950, the S&P 500's average monthly return from November to April has been roughly 1.3%, compared with about 0.7% from May to October. That gap is real. But "real" and "actionable" are not the same thing.

The problem is compounding. A fully invested portfolio that stayed in the market from 1950 through 2025 crushed the sell-in-May version by a wide margin. Not because summer months were great, but because the positive months you miss by sitting in cash more than offset the occasional drawdown you avoid. Transaction costs, tax drag on short-term gains, and the near-impossibility of timing re-entry precisely eat into whatever theoretical edge seasonality provides.

Put plainly: the strategy describes a statistical tendency. It does not describe a profitable system. Those are different things, and confusing them has destroyed more P&L than any August pullback.

Is August Historically a Bad Month for Stocks?

This is where the August stock market crash narrative falls apart. August is not, by any reasonable measure, a reliably bad month.

Since 1928, August has posted a positive return in roughly 55% of years for the S&P 500. Its average return is slightly negative, about -0.1%, but that figure is dragged down by a handful of severe outliers (think August 1998, August 2011, August 2015). Remove the three worst Augusts and the month looks perfectly average.

Volatility does tend to pick up in late summer, partly because trading desks are thinly staffed and liquidity dries up. Thin markets amplify moves in both directions. That's worth knowing for position sizing. It's not a reason to sell everything.

The real risk in August isn't the calendar. It's the narrative. When enough retail traders believe the month will be ugly, they sell preemptively, which can create a brief, self-fulfilling dip followed by a sharp reversal that punishes anyone who stepped aside. We've seen that pattern repeat in recent years.

What Are the Worst Performing Months for the S&P 500?

If you want to talk about stock market seasonality with any precision, the worst months for returns are September and, to a lesser extent, February. Not August.

September holds the distinction of being the only month with a meaningfully negative average return over nearly a century of data. Its average loss sits around -1.0%, and it has finished in the red more often than any other month. February runs a distant second.

August sits in the middle of the pack. Not a standout in either direction. The idea that it belongs in the same conversation as September is a product of recency bias and anecdotal memory, not rigorous analysis.

You can chart seasonal patterns with Traderise to verify this yourself. Overlay monthly returns for the past 20 years and the visual tells the story faster than any table.

Should You Change Your Portfolio Based on Seasonality?

Short answer: almost certainly not.

Seasonality is a weak signal. It can inform how you manage risk around the edges: tightening stops, reducing position size in low-liquidity windows, being more selective about new entries. That's sensible. What isn't sensible is making binary in-or-out decisions based on a calendar.

Consider what's happening right now. The AI-stock selloff looks dramatic on a daily chart, but a controlled correction in the most crowded trade of the cycle may actually be healthy for the broader bull market. If you sell your portfolio because "August is bad" and the market rips higher on strong earnings, you're left chasing, buying back at worse prices with worse tax treatment.

The S&P 500 earnings beat rate analysis from Q2 reporting season shows companies are still clearing the bar at a solid clip, even as stocks sell off on forward guidance concerns. That disconnect between earnings quality and price action is worth paying attention to. It suggests the pullback is about positioning and sentiment, not fundamentals.

For traders navigating the current mega-cap volatility, a structured approach matters more than a seasonal thesis. The mega-cap earnings options strategy framework is one way to define risk around event-driven moves without abandoning your core positions.

What Actually Matters More Than the Calendar

The traders I've watched blow up their accounts rarely do it because they ignored seasonality. They do it because they ignored process. They sized too large into conviction trades. They refused to cut losers. They let a narrative, seasonal or otherwise, substitute for a plan.

If you're asking "should I sell stocks in August," you're asking the wrong question. The right question is: does my current positioning reflect my risk tolerance, my time horizon, and the information available right now? If yes, the calendar is irrelevant. If no, fix the positioning, but fix it because the math demands it, not because a Wall Street proverb told you to.

August will bring volatility. Some of it will be driven by thin liquidity, some by earnings surprises, some by macro events nobody can predict today. None of that is unique to August. It's just the market doing what the market does.

The disciplined move, as always, is to size your risk so that no single month, good or bad, determines your year. That's less exciting than a seasonal panic trade. It also works.