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Audience Intelligence Glossary

What Is Share of Search?

Share of search is the proportion of all search demand in a category that goes to one brand. It is measured continuously, costs nothing to observe, and tends to move before reported market share does — which is why it has become a standard early-warning metric.

The appeal is straightforward: market share arrives quarterly, in arrears, and often from a paid panel. Search demand is observable every month for every brand in a category at once, including brands nobody is tracking yet.

The formula

Share of search = (search volume for the brand) ÷ (search volume for all brands in the defined category)

Example: 180,000 of 1,200,000 monthly category searches → 15.0% share of search

Everything difficult about the metric sits in the denominator. The category definition — which brands are in it, which generic terms count, which markets are included — determines the result more than the brand's own volume does.

Why it leads market share

  • Search precedes purchase in most considered categories, so demand shows up in queries before it shows up in sales.
  • It captures the whole funnel at once — a brand losing share of search is usually losing consideration, which appears in revenue one or more quarters later.
  • It covers competitors symmetrically. The same measurement applies to every brand in the category, including entrants too small to appear in panel reporting.

Where it stops working

Share of search is a strong signal in the right conditions and a misleading one outside them. Four situations break it:

  • Brand-name ambiguity. A brand whose name is also a common word absorbs unrelated searches and reads far too high. This is a data-hygiene problem, not a demand signal.
  • Impulse and low-consideration categories. Where people do not research before buying, search volume simply is not where the demand appears.
  • Category expansion. Absolute volume can rise while share falls, which looks like decline in a share chart and like growth in the business. Always read share and absolute volume together.
  • Campaign spikes. A burst of paid activity lifts branded search for weeks without a change in underlying demand. Trends should be read over quarters, not weeks.

How Rascasse measures it

Rascasse tracks share of search per market and per category rather than globally, on a monthly cadence, with the category definition made explicit so the denominator can be audited. The same signal also feeds the audience profiles: sustained search interest is one of the behavioral signals used to estimate audience size and affinity.

In the product

Continuous share-of-search tracking, including seasonality and regional breakdowns, sits in ShareOfSearchOps.

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