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 edition (2019) is available as an ebook:
Older editions are on the 3rd floor at the call number HF 5410. M35.