Re: Olpers/Engro Foods assignment
So you want somebody to do your work for you? 
Anyways, information such as market shares etc. isn’t really formally published except only in syndicated reports by research firms etc.
Your best bet would be to start with the company’s reports like the 10Ks and/or the Annual Report.
Also conduct a general search for articles about the company, its products / brands etc. using a business database such as ABI/Inform, Business & Company Resource Center, Business & Company ASAP or General Business File ASAP.