Calculations Very Slow

Hi

I have been analyzing data using the great recommendations made by Excel Forum participants. These formulae have worked very well analyzing data from 500-1000 companies. However, when I moved up to 4000-50000 companies the worksheets have slowed tremendously. I am wondering if you would review the formulae used on the attached sheet to see if there is a more "efficient" formula that might speed up worksheet? Alternatively, I have begun to explore using Access 2010 to finish the analysis.

Thank you for taking the time to read and consider this request.

Al Charbonneau