Student or Learner
The following sentence "whose production......." indicates only company E? or the "whose" indicates all A,B,C,D and E companies?
"The company works with world leading manufacturers, such as A, B, C, D, and E, whose production today occupies a leading position in the markets of developed countries."
Unless companies A-D didn't have much or any of the market share in developing countries, I'd assume the writer meant all of them, but it is not clear.