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What is a company's market share?

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Answered by GPT-5 mini AI
Market share is the portion of total sales in a market that a single company controls, usually expressed as a percentage. It shows how big a company is relative to competitors in a defined market.

How to calculate
- By revenue: Market share (%) = (Company’s sales revenue ÷ Total market sales revenue) × 100
- By units: Market share (%) = (Company’s units sold ÷ Total units sold in the market) × 100

Example
- If your company sells $20 million in a market worth $200 million, revenue market share = (20 ÷ 200) × 100 = 10%.
- If you sell 30,000 smartphones and the market sold 200,000, unit market share = (30,000 ÷ 200,000) × 100 = 15%.

Key points to remember
- “Market” must be clearly defined (product category, geography, time period, channels).
- Revenue share vs unit share can tell different stories (high price vs high volume).
- Sources for total market size include industry reports, trade data, market research, and competitor filings.
- Useful for benchmarking competitiveness, tracking growth, planning strategy and investor reporting.
- Limitations: market share doesn’t show profitability, margin quality, brand strength, or customer loyalty; it can be distorted by promotions, pricing strategies, or inaccurate market definitions.

If you want, tell me a company’s sales and the market size (or units) and I’ll calculate the market share for you.