No strictly Canadian compendium of market share information exists. You often have to gather the information yourself - by searching newspaper, magazine and journal databases, contacting the company, or calculating a rough estimate of market share using sales from Canadian company directories (e.g., Calculating Market Share Using Canadian Business Database).
You need to include the top three competitors in your industry as defined by your SIC or NAICS code. Your company may or may not belong on this list. One column should indicate the names of the companies in order of largest to smallest market share. The second column should indicate the market share percentage (based on the industry size) that is associated with each company. The third column needs to show the value of the market shares translated into sales or revenue of the industry. To be clear, you are calculating this based on the industry size amount (industry size times market share)(e.g., C$10 million x 20% = C$2 million) not on your company’s overall revenue.