Broad-Based Index An index designed to reflect the movement of the entire market. The smallest broad-based index is the Dow Jones Industrial Average with 30 industrial stocks and the largest is the Wilshire 5000 Total Market Index. Other examples include the S&P 500, Russell 3000 Index, AMEX Major Market Index and the Value Line Composite Index. Investopedia Says: Investors who want the maximum benefit of diversification can invest in securities that have as their underlying tracking instrument an index or other financial product made up of several, well-diversified stocks. Securities based on broad-based indices allow investors to effectively own the same basket of stocks contained in a major index while committing a small amount of financial resources. Related Terms: Diamonds Dow Jones Industrial Average - DJIA Index Index Fund iShares Russell 2000 Index Spiders - SPDRs Standard and Poor's 500 Index - S&P 500 Value Line Index Wilshire 5000 Total Market Index - TMWX |