If your threshold values are in ascending order, you can use INDEX/MATCH with a "Match Type" of 1 on the threshold values to return the proper category. In the attached sample, the threshold table is in G2:H6, the company revenue is in B2, and the lookup in C2 is:
=INDEX($H$2:$H$6,MATCH($B2,$G$2:$G$6,1))
Fill down for other companies. Take a look at the attachment to see if it'll do the trick:
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