For decades, Wall Street looked like a men's club: cigars, suspenders, and traders shouting into telephones. At the same time, conventional wisdom often portrayed women as too cautious or hesitant to be serious investors.
It turns out that conventional wisdom aged about as well as a 1970s leisure suit.
When researchers compare how men and women actually invest, one pattern keeps showing up: women often earn better returns. That may not be what the room full of cigar smoke would have predicted, but the data is hard to argue with.
The study that started it all
In 2001, professors Brad Barber and Terrance Odean published a study with the wonderfully blunt title "Boys Will Be Boys." They dug into more than 35,000 brokerage accounts and found that men traded about 45% more frequently than women, and all that extra activity came at a cost. After adjusting for risk, women came out ahead by roughly 1.4% per year.
Put another way: if you invested $10,000 at 30 and earned 7% a year, by 65 you'd have about $107,000. If you'd earned 8.4% instead, you'd have about $168,000. That "small" 1.4% annual difference adds up to more than $60,000 over 35 years.
The gap got even wider among unmarried investors. Single men traded about 67% more frequently than single women, with correspondingly weaker results. Apparently, without someone in the house asking "are you sure about that?", some men treat their brokerage accounts like slot machines in Reno.
The problem wasn't that men picked worse companies. It was that they were too confident in their ability to know when to buy, when to sell, and what would happen next. The more they acted on that confidence, the more performance they gave up.
Fidelity's numbers back it up
Fidelity reached a similar conclusion after analyzing 5.2 million customer accounts for its 2021 Women and Investing Study. Women outperformed men by an average of about 0.4% per year.
That may not sound like much. But as that earlier example showed, even a fraction of a percent has a way of snowballing when you give it a few decades to work. That's not pocket change. That's quite a few vacations, grandchild-spoiling sprees, or an earlier retirement.
The most interesting part? Many women didn't realize they were winning. In an earlier Fidelity survey, only 9% of women believed they would outperform male investors. They were beating the guys and didn't even know it. Talk about humble.
The Brits saw the same thing
Across the pond, researchers at Warwick Business School studied roughly 2,800 investors over three years and found that women outperformed men by about 1.8% annually. Women were generally less likely to chase speculative, lottery-style stocks, and more likely to stay diversified and hold their investments longer.
Once again, the edge didn't come from predicting the future better. It came from making fewer unforced errors.
Why do women tend to do better?
The research points to a few behavioral differences that keep showing up.
First, overconfidence. Men are statistically more likely to believe they can beat the market through active decision-making. The market, historically, has not agreed. Confidence has its place, but in investing it often leads to unnecessary trades, concentrated bets, and attempts to call short-term moves that nobody can reliably call.
Second, overtrading. Every trade introduces friction. Even with zero commissions, you still face taxes, bid-ask spreads, bad timing, and the risk of selling a good investment too early. Men trade more on average. Women are more likely to let their investments, and compound interest, do the heavy lifting.
Third, emotional reactions. During market stress, the worst move is often selling simply because prices already fell. Vanguard data from the 2020 COVID crash showed men were more likely to bail out of stocks during the decline, while women were more likely to stay invested and ride the recovery. Staying calm during a downturn doesn't feel productive, but it's often one of the most productive things an investor can do.
And fourth, women are more likely to frame investing around specific goals: retirement, family security, education, financial independence. That makes it easier to tune out the daily noise. When you know what the portfolio is for, there's less temptation to treat it as entertainment.
In other words, slow and steady doesn't just win the race. It tends to win on account statements too.
To be fair
Before anyone declares victory, a little context is in order.
Men have historically invested a larger share of their money and often started earlier, so they can end up with bigger balances even when their percentage returns are a bit lower. Women have also traditionally held more cash. That caution helps during downturns, but too much cash creates a different problem: inflation slowly eats away at purchasing power.
The confidence gap cuts both ways. Too much confidence leads to reckless trading. Too little can keep someone from investing at all. The goal isn't to invest like a stereotypical man or a stereotypical woman. It's to borrow the best tendencies of both.
That's probably why couples who make investment decisions together tend to do well. Different temperaments balance each other out, and two people stress-testing a decision usually beats one person acting on a hunch.
The Bottom Line
Based on the research, women have historically been the better investors on a percentage-return basis. Not because they have secret financial knowledge. Not because they can predict the market. And not because every woman is patient or every man is reckless.
They've done better because they trade less, chase fewer speculative ideas, and let time and compounding do their thing.
The lesson isn't that anyone should hand over their brokerage passwords. It's that successful investing usually means doing less. A good portfolio doesn't need constant supervision, a new idea every week, or to become a hobby.
So the next time your wife questions a hot stock tip, it's worth hearing them out.
Statistically speaking, they often have a point.
Sources
Brad M. Barber and Terrance Odean, "Boys Will Be Boys: Gender, Overconfidence, and Common Stock Investment," Quarterly Journal of Economics (2001); Fidelity Investments, Women and Investing Study (2021); Warwick Business School investor behavior study (2018); Vanguard investor behavior data (2020).
Disclosures
This material has been prepared for informational purposes only and should not be construed as a solicitation to effect, or attempt to effect, either transactions in securities or the rendering of personalized investment advice. This material is not intended to provide, and should not be relied on for tax, legal, investment, accounting, or other financial advice. You should consult your own tax, legal, financial, and accounting advisors before engaging in any transaction. Asset allocation and diversification do not guarantee a profit or protect against a loss. All references to potential future developments or outcomes are strictly the views and opinions of Richard W. Paul & Associates and in no way promise, guarantee, or seek to predict with any certainty what may or may not occur in various economies and investment markets. Past performance is not necessarily indicative of future performance.