Mark, here are the companies I know of. There may have been a cavalry company or two, but none that I can confirm.

14th Regiment Arkansas Militia
Rector Grays, Co. A, 5th Regiment Arkansas Infantry
Harrisburg Rifles, Co. F, 5th Regiment Arkansas Infantry
1st Co. C (later 2nd Co. K), 13th Regiment Arkansas Infantry
Co. A, 23rd Regiment Arkansas Infantry
Co. K, 23rd Regiment Arkansas Infantry
Co. B, 30th Regiment Arkansas Infantry
Co. D, 30th Regiment Arkansas Infantry