For purposes of this part, companies shall be classified as follows based on the admitted assets as of the end of the calendar year for which the actuarial opinion is applicable:

1. (1) Category A shall consist of those companies whose admitted assets do not exceed twenty million dollars ($20,000,000);
2. (2) Category B shall consist of those companies whose admitted assets exceed twenty million dollars ($20,000,000) but do not exceed one hundred million dollars ($100,000,000);
3. (3) Category C shall consist of those companies whose admitted assets exceed one hundred million dollars ($100,000,000) but do not exceed five hundred million dollars ($500,000,000); and
4. (4) Category D shall consist of those companies whose admitted assets exceed five hundred million dollars ($500,000,000).