As a general rule of thumb,the U.S.Department of Justice views industries to be highly concentrated if the Herfindahl index is:

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According to the U.S. Department of Justice, industries are considered highly concentrated if the Herfindahl index is above 1,800. This indicates that the market is dominated by a small number of firms, which can have implications for competition and consumer welfare. A Herfindahl index below 1,800 is generally considered to have moderate concentration, while an index above 2,500 is considered highly concentrated and is more likely to raise antitrust concerns.

As a General Rule of Thumb,the U