SIE (Securities Industry Essentials) Practice Exam

The Wilshire 5000 is considered the broadest market index because it includes all stocks actively traded in the United States, which is over 3,500 companies. The S&P 500 only includes 500 large-cap stocks, the Dow Jones Industrial Average includes 30 large-cap stocks, and the Nasdaq Composite includes over 3,000 companies but is mostly focused on technology and growth stocks. Therefore, the options A, B, and C are incorrect because they do not encompass as many companies as the Wilshire 5000.