The company was founded by carriage maker Joseph W. Moon. Moon produced both cars and trucks and their peak production year was 1925 when the company produced 10,271 vehicles.
In addition to the Moon name, they were sold under the Hol-Tan name in 1908. Moon produced the Diana via its subsidiary the Diana Motors Company in 1925 - 1928. Another subsidiary produced the Windsor in 1929-1930.
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The firm also produced a Cotton picker .
Beginning in 1924, Moon was increasingly unable to meet dealership orders. The company went out of business at the start of the Great Depression; the Moon factory was purchased by Ruxton automobile.
Moon automobiles are on display at the Missouri History Museum and Museum of Transportation in St. Louis, Missouri. The amusement park Six Flags St. Louis also features a ride using the Moon automobile body.