Glossary
What is Remnant inventory?
Also called: remnant, unsold inventory
Remnant inventory is the ad space left after direct-sold campaigns take their share. Most of it is now sold through programmatic auctions.
हिंदी में पढ़ेंRemnant inventory means the leftovers: impressions that guaranteed, direct-sold campaigns did not take. On a site that sells 200,000 of its 1 million monthly homepage impressions directly, the other 800,000 are remnant.
Remnant is industry usage rather than a standards-body term, and teams use it slightly differently. Some use it only for unsold inventory sold cheaply. Today most remnant is sold in programmatic auctions through SSPs and exchanges, so remnant and programmatic overlap. They are not the same thing, though: programmatic guaranteed deals are programmatic but not remnant.
In Google Ad Manager, remnant demand runs at priority 12: Price priority, Network and Bulk line items, alongside AdSense and Ad Exchange, all competing on price. Pricing rules set the floors these line items must meet. Whatever is still unsold can go to house ads, your own promos, at priority 16, or stay unfilled.
Example
A homepage has 1,000,000 impressions a month. Direct campaigns take 200,000 at a $12.00 CPM. The other 800,000 are remnant; sold at a $2.00 CPM they earn 800,000 × $2.00 ÷ 1,000 = $1,600.
Why it matters to publishers
For publishers with little direct sales, remnant can be almost all of their inventory, so how well it is auctioned shapes their revenue.