Below are two links from the same site, and it says,

"The American Express SimplyCash Business Card is aimed at the small business owner with very good credit. It offers a reward program which earns the cardholder variable rebate percentages."

Then another link says,

"The American Express SimplyCash(SM) Business Card is designed for those with very good credit and who plan to take advantage of the cash back reward program."

I dont think it's a problem to apply one for just individual.  It's worth a try.