Old Thompson is a brand of blended American whiskey produced by Barton Brands, which is now owned by the Sazerac Company. It is known for its low price among brands of American whiskey. The company refers to it as "an excellent value". The brand dates back to 1904, when it was introduced by the Glenmore Distillery Company which at the time was owned by the brothers James Thompson and Francis P. Thompson.
It is a blended whiskey bottled at 40% alcohol by volume (80 U.S. proof), and formulated from 80% neutral grain spirits and a 20% mixture of straight whiskeys.
Higher quality categories of American whiskey sold in the market, such as straight whiskeys, are not allowed to contain added neutral grain spirit.
Under the U.S. Code of Federal Regulations for American whiskey, a blended American whiskey is required to contain at least 20% straight whiskeys, and Old Thompson is formulated according to this minimum requirement.
The minimum alcohol concentration allowed under the U.S. Code of Federal Regulations for American whiskey is 40%, and Old Thompson is also formulated according to this minimum requirement.
There is no aging requirement under the U.S. Code of Federal Regulations for American whiskey for the neutral grain spirits in an American blended whiskey, although there is a 2-year minimum aging requirement for straight whiskey (and for the straight whiskey used in the mixture from which a blended whiskey is formulated) and there is a requirement for an age statement on the label of a blended whiskey containing neutral spirits in cases where the straight whiskey used in the blend is less than 4 years old. A labeling age statement on American blended whiskey that contains neutral spirits (per Title 27, Part 5, Subpart C, Section 5.40) ordinarily refers only to the age of the 20% content of the product that is the straight whiskey used within the blend, and the neutral grain spirits used in the blend may not have been aged. The company web site for Old Thompson refers to it as "4 Year Old Blended American Whiskey", and the picture of the label itself on the web site does not show an age statement, so Old Thompson is formulated from 20% 4 year old straight whiskey and 80% (un-aged) neutral spirits.