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|NYSE Arca Natural Gas Index|
|The NYSE Arca Natural Gas Index (XNG) is an equal-dollar weighted index designed to measure the performance of highly capitalized companies in the natural gas industry involved primarily in natural gas exploration and production and natural gas pipeline transportation and transmission. The XNG Index was established with a benchmark value of 300.00 on October 15, 1993. (The index value was later split 2-for-1 on March 23, 1999.) The XNG Index is rebalanced quarterly based on closing prices on the third Friday in January, April, July & October to ensure that each component stock continues to represent approximately equal weight in the index.