Every May, like clockwork, Wall Street’s talking heads dust off the same tired playbook: “Sell in May and go away.” It’s the financial equivalent of a dad joke—everyone knows it, nobody really believes it, but somehow it keeps getting repeated.
Here’s the thing: this year, following that advice could cost you serious money.
The whole “sell in May” thing actually started in 19th-century London when wealthy bankers would bail on the city’s sweltering streets for countryside vacations. Trading volumes dropped, markets got sleepy, and stocks drifted sideways. The full saying was even weirder: “Sell in May and go away, come back on St. Leger’s Day”—basically telling rich guys to check out until the horse races in September. When this migrated to Wall Street, it stuck around for decades. And yeah, from 1950 to 2003, the data actually backed it up.
But here’s the problem with any trading system: once everyone knows about it, it stops working.
Now, I’ll be honest—August and September still suck. The S&P 500 averages just 0.05% in August and negative 0.67% in September. If I ran things, I’d close the market for all of August. That’s when the A-team heads to the Hamptons and the B-team gets left holding the bag.
But here’s where conventional wisdom completely breaks down: July has actually been the market’s best month over the past 20 years, up 2.54%. Not November. Not April. July. So “sell in May” doesn’t just sideline you during the weak months—it makes you miss some of the best trading days of the year.
**The Real Story: Small Caps Are Waking Up**
Now here’s where things get interesting. While everyone was obsessing over the Magnificent Seven and mega-cap AI plays, something quietly shifted in smaller companies.
The Russell 2000 is up 31% over the past year versus 23% for the S&P 500. Year-to-date, small caps are still leading—up 11% versus the S&P 500’s 7.7%. And they’re still cheap. Small caps currently represent just 4.6% of total Russell 3000 market cap, well below the historical average of 7.6%.
Why does this matter? Small-cap companies are predominantly domestic. They don’t have the global exposure that makes large caps vulnerable to currency swings and geopolitical chaos. When the U.S. economy is growing—and right now it is—small caps feel it most directly.
The move has started, but it’s nowhere near over. After years of playing second fiddle to mega-cap tech, capital is rotating toward smaller, domestically focused companies with real earnings growth and real exposure to the American economy.
**The Bottom Line**
This isn’t the summer to sit on the sidelines. The small-cap opportunity is real, but you can’t just buy an ETF and walk away. You need to find the right ones—companies showing strong fundamentals with institutional money quietly moving in ahead of the headlines.
That’s where the real gains hide.
