This chart compares the market value of publicly listed companies in the United States from 2003 to 2024, categorizing them as either 1) microcaps, or 2) large-, mid-, and small-caps. The market value of microcap companies, which are considered less investable, ranges from about $1.5 trillion in 2003 to about $4.6 trillion in 2024, peaking at about $5.6 trillion in 2021. The market value of large-, mid-, and small-cap companies is much larger throughout the period, ranging from about $11.0 trillion in 2003 to about $55.9 trillion in 2024.