Definition
Share of search is the proportion of search demand or search results a brand or product captures within its category — a visibility metric tied to demand, discoverability, and competitive position, often used as a leading indicator of market share.
Key points
- It has two sides: demand (share of category search volume) and supply (share of results).
- It is a leading indicator — visibility tends to precede sales.
- Weak product data lowers supply-side share by qualifying for fewer queries.
- It is measured relative to competitors within a category.
How is share of search used in practice?
Teams track their share of category search over time as an early read on brand momentum, and their share of results to spot where competitors out-surface them. On the supply side, improving attribute coverage and relevance is often the fastest way to raise share of results.
Common pitfalls
- Confusing demand-side and supply-side share — they answer different questions.
- Treating it as a vanity metric rather than a demand signal.
- Ignoring the role of data quality in supply-side share.
FAQ
How is share of search measured?
It can be measured on the demand side (your brand's share of category search volume) or the supply side (your share of the results and placements for category queries). Both track how much of the available attention you capture relative to competitors.
Why does share of search matter?
It reflects demand and visibility before it shows up in sales, so it is a useful early signal. On the supply side, weak product data quietly lowers your share of results.