New Century-Long Study: 46 Companies Created Half of All U.S. Stock Market Wealth Since 1926

The Math Behind a Century of Stock Returns

A new study from Hendrik Bessembinder, a finance professor at Arizona State University's W.P. Carey School of Business, delivers a blunt statistic: only 27.6% of individual U.S. stocks outperformed the broader market between 1926 and 2025. Nearly 60% of stocks actually destroyed shareholder wealth over their lifetimes, according to the study.

Bessembinder examined 29,754 publicly traded U.S. stocks across that century-long window, detailed in a white paper covering the full dataset. The median stock delivered a lifetime return of negative 6.9%. Fewer than half of all stocks ever traded produced a positive lifetime return. Only about 41% managed to beat the return on Treasury bills, the safest asset in the market, during the years they were publicly traded.

And yet, zoomed out, the stock market as a whole did extraordinarily well. The overall market produced an annualized return of roughly 10.1% over the century, according to the study, turning every dollar invested in 1926 into more than $15,000 today.

Why a Few Companies Carry the Whole Market

Stock returns are wildly asymmetric. A company's stock can only fall to zero, wiping out 100% of an investor's money. But there's no ceiling on how much a winning stock can rise: 10x, 100x, 1,000x or more.

Over long stretches of time, that asymmetry means a small number of massive winners can generate enough gains to offset thousands of stocks that go nowhere or go bankrupt entirely. Bessembinder's research finds that of the roughly $91 trillion in net wealth created by U.S. stocks since 1926, just 46 companies were responsible for half of it.

That concentration has gotten worse over time, not better. Bessembinder's earlier version of this research, covering 1926 through 2016, found that it took 89 companies to account for half of all shareholder wealth created. Adding nine more years of data cut that number roughly in half, down to 46 companies.

The study doesn't name all 46 companies in the portion of the research covered here, but the broader pattern lines up with what's visible in the market today: a handful of mega-cap technology firms, Apple, Microsoft, Nvidia, Amazon, Alphabet and a few others, now make up an outsized share of total U.S. market capitalization. That's consistent with decades of prior Bessembinder research showing extreme winner concentration going back to firms like Exxon, General Electric, and IBM in earlier eras.

What This Actually Means for Investors

The study is not an indictment of the stock market or evidence that it's "rigged" against ordinary investors, and nothing in Bessembinder's findings suggests fraud, manipulation, or unequal treatment of retail versus institutional traders. It's a math problem, not a corruption story.

An investor who buys a single stock, or even a handful of stocks, has roughly a 60% chance of picking something that loses money over the long run and worse-than-coin-flip odds of beating an index fund. An investor who owns the entire market through a broad index fund automatically captures whatever tiny fraction of companies turn into the next Apple or Nvidia, without having to guess which ones in advance.

That's the argument index-fund advocates like Vanguard founder John Bogle made for decades, and Bessembinder's data gives it fresh empirical weight. It's also a reminder that stock-picking, as a strategy, is playing a game with brutal odds stacked against the average participant, professional fund managers included. Most actively managed mutual funds fail to beat their benchmark index over 10- and 15-year periods, according to S&P Dow Jones Indices' long-running SPIVA scorecards.

None of this means concentrated stock ownership is irrational for everyone. Company founders, early employees with stock options, and investors with genuine insight into a specific business have legitimate reasons to hold concentrated positions. But for the average retail investor picking stocks based on headlines, hot tips, or gut instinct, the odds are not in their favor.

The unresolved question is what happens if market concentration keeps intensifying. If the trend from 89 companies down to 46 companies driving half of all wealth creation continues, future index investors will be leaning even more heavily on an even smaller handful of mega-winners, a concentration risk that cuts against the diversification benefit index funds are supposed to provide in the first place.