Market Share is the percentage of sales (by value or volume) that a brand or company has for a specific product or product category. Reports can range from broad industries to specific products, so be aware of what segments or categories are included.
World Market Share Reporter is one of the most comprehensive sources for global market share data.
The most recent editions are available as an ebook:
Older editions are on the 3rd floor at the call number HF 5410. M35.
Market Reports in ABI/Inform Collection
Business Source Complete - Company/Industry Information
Business Source Complete is a comprehensive database of business information. Find company and industry news, academic journals, trade publications, country reports, and much more.
After searching use the "Source Type" filter on the left to narrow your search. SWOT Analysis, Industry Profiles, Market Research Reports, and Trade Publications all might be useful for this project.