Requires the Securities and Exchange Commission (SEC) to study how it defines “small entity,” report findings and recommendations to Congress, and update its rules and dollar thresholds accordingly. The SEC must complete the first study within 1 year of enactment, repeat the study every 5 years, revise rules after each study through public notice-and-comment rulemaking, and adjust any dollar figures for inflation every 5 years using the CPI‑U.