The Shrinking Public Market

For most of the twentieth century, the public stock market was where the economy's growth showed up. A company grew, went public early, and the ordinary investor rode the expansion from there on. That arrangement quietly ended. The evidence is one startling fact: the number of companies listed on U.S. exchanges has roughly halved since the mid-1990s, from around eight thousand down to near four thousand.

That's not a statistical curiosity to file away. It changes what you're buying when you buy the market. The public market has gotten smaller, older, and more concentrated, and the growth that used to happen out in public view now happens in private hands. If your entire equity exposure is a public index, you owe it to yourself to understand what that index no longer holds.

Fewer Companies, And Older Ones

The halving of the public company count is one of the most important facts in modern markets, and one of the least discussed. Right alongside it, the companies that do go public are far older than they used to be. A technology company that once listed a few years after its founding now often waits a decade or more, arriving on the exchange as a mature business instead of an emerging one.

Put those two facts together and the picture is clear enough. There are fewer public companies, and the ones left standing are, on average, bigger and later in their lives. The exchange stopped being the on-ramp to growth. These days it's closer to a retirement home for companies that already did their growing somewhere you couldn't invest.