How share of voice works
Share of voice measures how much of the total possible advertising presence you captured. In paid search, the practical expression is impression share: out of every auction you were eligible to appear in, what fraction did your ads actually show in. A 60 percent share means four in ten eligible impressions went to competitors or were lost to your own constraints. Across a category, share of voice tells you whether you are the dominant advertiser buyers keep seeing or a minor presence that shows up occasionally, which is a strategic fact about brand visibility, not just a campaign metric.
Where share of voice is lost
Impressions you did not win are lost for one of two reasons, and the distinction matters. Impression share lost to budget means you were competitive enough to show but ran out of money, which is a funding decision. Impression share lost to rank means your ad rank was too low to appear, which is a bid, quality, or relevance problem. Diagnosing which one is costing you share tells you whether the fix is more budget or a better-built campaign, and confusing the two leads to spending money where quality was the real constraint.
When to chase share of voice
More share of voice is not always the goal. On high-intent, profitable queries, chasing near-total impression share can be exactly right because every appearance is a chance at a valuable customer. On broad or marginal queries, buying more share simply buys more low-quality volume at worsening efficiency. Share of voice is a lever to push hard where the economics reward dominance and to hold back where they do not, so it is always read against profitability rather than pursued for its own sake.
How iClick uses share of voice
iClick uses share of voice, expressed through impression share, to decide where dominance is worth paying for and where it is not. The rule is to separate share lost to budget from share lost to rank, because one is a funding fix and the other a campaign-quality fix, and then to chase share only on the high-intent queries whose economics reward owning the room. On marginal queries, more share is treated as more waste, not more win.
