Sorting Data with formulae

Hi everyone

I have the attached list. I would like to sort it as it is currently, with Company 1 and Company 2 together, Company 3 and Company 4 together and the remainder of the list being ordered by the values of the "amount" column. Is there anyway to do this? I had a go with some formulae but it got very complicated and nonsensical rather quickly. Note that the position of Company 1 and 2 is dependent on the size of "amount" for the higher of the two. E.g. if Company 1 is 20 and Company 2 is 25, Company 2 will come first followed immediately by Company 1 even if (say) Company 5 is amount 23. The same is true for Company 3 and 4.

Thank very much, please ask if this is unclear!

maybe with a pivot table like this