The Shrinking Stock Market: Why Public Companies Are Disappearing?

If you look at the U.S. stock market today, a surprising trend emerges: there are significantly fewer publicly listed companies now than there were a few decades ago.

Why are companies choosing to stay private longer, or avoiding the public markets altogether? In our latest market update, Jim Gore of THOR Wealth Management examines the regulatory shifts—specifically the Sarbanes-Oxley Act—that have contributed to the decline in publicly traded U.S. companies.

Jim walks through historical IPO examples and market cap trends to show how the landscape has shifted. Finally, he takes a hard look at the alternative: private equity. By comparing private equity expense ratios side-by-side with broad-based index funds, we uncover what this growing gap means for the everyday investor.

Charting The Markets Slides:

The Impact of Sarbanes-Oxley

The Impact of Sarbanes-Oxley

There has been a 25%+ drop in public traded companies since Sarbanes Oxley.

Line chart of total return growth for The Goldman Sachs Group (purple) and the S&P 500 (orange) from 2000 to 2026, ending at about 0.41K and .85K respectively.

Goldman Sachs IPO

Example of The Goldman Sachs Group Inc (GS) going public in 1999 and forward returns.

Semiconductor Industry Trends

On Semiconductor IPO

Example of ON Semiconductors  (ON) going public in 2000 and forward returns.

Accenture IPO

Accenture IPO

Example of Accenture (ACN) going public in 2001 and forward returns.

Chart titled Market Capitalization at IPO vs. the Largest Company of the Era; shows Goldman Sachs IPO 1999 at B, On Semiconductor .5B, Accenture B, Pfizer at 3B (2000).

Market Cap at IPO

We are seeing massive market cap companies coming to the public market compared to the previous era highlighted.

Expense Ratio Comparison slide: SPY 0.09%, IWM 0.19%; private equity 2%/20%; Thor Wealth Management logo.

Expense Ratio Comparison: Private Equity vs. Index Funds

Expenses of private equity is significantly higher than public equity. This is hurting individual investors since there is a current push to add private equity to 401ks. A better solution would be to repeal Sarbanes Oxley. This would cut regulation and increase the pool of public companies available to investors.

Understanding What You Own—and What You Pay

As the number of public companies shrinks and alternative investments like private equity grow in popularity, understanding fee structures and liquidity is more important than ever. 

At THOR Wealth Management, our investment management strategy prioritizes transparency, objective data, and cost-efficiency. If you have questions about the fees hidden in your portfolio, or want to build a comprehensive financial plan for the future, reach out to our team today.