DefinitionShare of search is the proportion of all search demand in a category that goes to one brand. It tends to move before reported market share does, which makes it a useful early-warning metric.
Everything difficult sits in the denominator
The category definition, meaning which brands are in it, which generic terms count and which markets are included, determines the result more than the brand’s own volume. Make it explicit so it can be checked.
The formula
Share of search = search demand for the brand ÷ search demand for all brands in the defined categoryExample (illustrative): 180,000 of 1,200,000 category searches in a quarter go to one brand. Share of search 15.0%.
Why it tends to lead market share
- Search precedes purchase in most considered categories, so demand shows up in queries before it shows up in sales.
- It reflects consideration. A brand losing share of search is usually losing consideration, which tends to reach revenue later.
- It covers competitors symmetrically, including entrants too small for panel reporting.
Common mistakes
- Ambiguous brand names. A brand whose name is also a common word absorbs unrelated searches and reads too high. That is data hygiene, not demand.
- Low-consideration categories. Where people do not research before buying, search is not where demand appears.
- Category growth. Absolute volume can rise while share falls. Read share and volume together.
- Campaign spikes. Paid bursts lift branded search for weeks without changing underlying demand. Read trends over quarters.
How Rascasse uses it
Rascasse measures share of search per country and category, with the category definition made explicit, updated quarterly and with up to ten years of history (4 to 10+ years depending on the market), by region where available. The same search signal is one of several behaviour signals used to describe audiences.
Related use cases: Share of Search & Market Share, Competitive Intelligence, Seasonality & Timing.
Related terms
Share of voiceShare of voice is the proportion of a category’s media presence that belongs to one brand.Audience sizeAudience size is the estimated number of people in a defined market who show sustained interest in a brand, club, artist, event or topic.Sponsorship impactSponsorship impact is the change in brand demand, awareness or perception that a partnership caused, as distinct from the change that happened while the partnership was running.