What is impression share?
Impression share is the percentage of times your ad appeared out of all the times it could have appeared. In search, 60 percent impression share means your ads showed for six out of ten eligible auctions and missed four.
Why you lose it
- Budget: the daily budget runs out while demand keeps searching. Your ads simply stop showing.
- Rank: your bid and quality lose auctions to competitors who bid more or run better ads.
The two losses ask different questions: lost to budget asks whether the campaign deserves more money; lost to rank asks whether the ads and bids are competitive enough.
Why it matters
Impression share is a map of untapped demand. High performance at low impression share means profitable growth is sitting on the table: people are searching, and you are not there. It is also a competitive gauge: watching your share move against the market tells you when rivals push harder or retreat.
How to use it
Read it with profitability, not alone. Chasing 100 percent impression share is vanity: the last auctions are the most expensive, and not every query deserves your presence. Prioritise impression share on the campaigns that prove incremental value, and let the weak ones lose auctions with pride.
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