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There are simply not a lot of women in senior positions in all of business, and finance to a great extent mirrors that reality.Getty Images/iStockphoto

Today I am going to pose a simple question that has been asked any number of times: Why are there so few women in senior positions in finance?

That sort of underrepresentation is common in senior positions at financial firms small and large alike. Some of this may be a legacy of what has not only been a male-dominated society, but it probably also reflects an industry that is particularly resistant to change. (Disclosure: At my firm, two of the 13 employees are women, though neither is on our investment committee.)

Why is this so?

The rough answer is obvious – there are simply not a lot of women in senior positions in all of business, and finance to a great extent mirrors that reality. There are, however, signs of change for the better, which we will get to later.

Some U.S. data first.

A Morningstar study last year found that:

Less than 10 per cent of all U.S. fund managers are women; women exclusively run about 2 per cent of the industry's assets and open-end funds. By contrast, men exclusively run about 74 per cent of the industry's assets and 78 per cent of funds, with mixed-gender teams accounting for the balance.

The numbers are similarly lopsided for various niches of the financial industry: Harvard Business School research on private-equity, real-estate and venture-capital firms shows the percentage of female senior investment professionals is "stuck in the single digits." But it's much more than just the senior executives – women make up only 17 per cent to 23 per cent of all employees.

That's true across the universe of investing firms, as well as the broad array of companies that make up the S&P 500 index. According to Catalyst, there are now only 20 women chief executives of S&P 500 companies, down from 24 in 2015. CNNMoney notes "only 14.2 per cent of the top five leadership positions" were held by women at these companies. Last year, women made up 17.9 per cent of the directors of Fortune 1000 companies. The number of female certified financial planners appears to have plateaued at about 23 per cent.

Meanwhile, studies by Credit Suisse Research Institute have shown that increasing the number of women on corporate boards is associated with better financial performance. McKinsey & Co. and Catalyst have reached similar conclusions.

While there is a potential correlation issue here – do well-managed firms have more women on their boards, or do women on boards make firms better managed? – the data nonetheless are striking. CSRI reviewed 2,360 companies globally during the course of six years; their analysis found that it was "on average better to have invested in corporates with women on their management boards than in those without ... companies with one or more women on the board have delivered higher average returns on equity, lower gearing, better average growth and higher price/book value multiples."

And it's more than just public companies – in the actively managed fund business, female managers tend to outperform their male peers. Several academic studies conclude that the outperformance is a result of taking less risk. (Note that some studies in Europe haven't found a gender performance difference.)

Men also trade more frequently, according to this study from the Haas School of Business at the University of California-Berkeley, and as we all know, excessive trading racks up fees that eat away at returns. Another study by a former Goldman Sachs trader reached a similar conclusion and found that "higher levels of testosterone led to more frequent trading and an increased risk of losses."

There are some encouraging signs: According to recent data, women now hold 20 per cent of the board seats at the largest companies, up from 15 per cent a decade ago.

And there is a strengthening movement to increase female board representation: 20/20 Women on Boards seeks to have females make up of 20 per cent of directors of all U.S. companies by 2020. Perhaps even more ambitious is, which aims to have "30 per cent of the world's investable capital managed by women by 2030."

The true, though unsatisfying, answer to my original question is: There are so few women in senior positions in finance because there have always been few women in finance. I know, because I've tried so hard to hire more of them. But the numbers are changing, and that's all for the better.

Barry Ritholtz is the chairman and chief investment officer of Ritholtz Wealth Management.