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DJU Investing and TradingDescription - Dow Jones Utilities IndexHistory of the Dow Jones Utilities Index Unlike the industrial average, which has undergone more than 100 changes in its nearly 104 years, the utility average has been relatively unaltered. Most of the changes in recent years are the result of mergers and acquisitions. Historical Dow Jones Utilities Indicator Originally, the utility average started with 18 stocks, and six months later, on July 1, 1929, the number was increased to 20. The average was reduced to 15 stocks on June 2, 1938, and has remained at that level ever since. For trivia buffs, the original utility average included American Telephone & Telegraph Co., which was removed in 1938 and added to the Dow Jones Industrial Average in March 1939, supplanting International Business Machines Corp.
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