Why 20% Revenue Growth Does Not Necessarily Mean a Market-Share Gain
Calculate market-share changes by comparing company and market growth on the same basis. Also examine how value versus volume measures, market definitions, and exchange rates can change the result.
A company can increase revenue yet lose share if its market grows faster. Calculate the change in share by dividing the company’s growth factor by the market’s growth factor. Both datasets must match in products, geography, period, and whether they measure value or volume.
Split revenue growth into market expansion and changes in share
Company revenue equals market size multiplied by company share, measured on the same basis. Revenue growth therefore includes both expansion of the market itself and the company capturing a larger portion. Apply last year’s share to this year’s market size to create hypothetical current-year revenue and isolate the market-growth effect. Under this decomposition, the difference between actual revenue and that amount is the market-share effect. If market data are estimates, extra decimal places do not improve their accuracy, so disclose the uncertainty in the underlying data.
Value share and volume share answer different questions
A higher mix of expensive products can increase value share even with unchanged unit sales. Conversely, using discounts to increase shipment share may contribute little to revenue and profit. Timing differences also arise if company revenue reflects shipments to distributors while market data measure sales to end consumers. First check whether segment disclosures isolate the relevant product’s revenue. Do not divide total company revenue, including other businesses, by the size of a narrow product market. Product and geographic information under IFRS 8 can provide a starting point for aligning the comparison scope.
Do not mistake a changed market definition for growth
Comparisons of share can break down if a company suddenly broadens its stated target market or a research provider changes its coverage. Align geographic coverage, currency, distribution stage, and research methodology. Without official data, limit the analysis to comparing the direction of company growth with verifiable industry indicators rather than inventing a precise market-share figure. If share rises while margins or customer retention deteriorate, growth may have been bought at a cost. Assessing sustainability requires considering discounts and marketing spending alongside the change in share.
Worked example
Hypothetical example: Last year, company revenue of KRW 10 billion in a market worth KRW 100 billion gave a 10% share. This year, the market grows 25% to KRW 125 billion and company revenue grows 20% to KRW 12 billion. Share falls to 9.6%, a decline of 0.4 percentage points. Maintaining last year’s share would require revenue of KRW 12.5 billion. The KRW 2 billion revenue increase can be split into a market-growth effect of KRW 2.5 billion and a market-share effect of -KRW 500 million. If company revenue were KRW 15 billion instead, share would rise 2 percentage points to 12%, and the share effect under the same method would be KRW 2.5 billion.
What to check
- Match products, geography, and periods in the market and company figures.
- Distinguish value-based from volume-based market share.
- Check classification changes and estimation error in market statistics.
- Consider the discounts and selling expenses used to gain share.
Sources and primary materials
This is educational material about research methods. For an actual company decision, verify the filings and primary sources for the relevant period.