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GlossaryArticleOperator-judged

Remnant

Leftover inventory that was not reserved. Open-exchange display is remnant. It is useful for tests and easy to misread.

Published 2026-09-09 · Search job: remnant inventory advertising

Remnant is the inventory that remains after reserved and preferred paths take their share. Open-exchange banners are remnant. They are cheap to test against and noisy to judge.

Leftover slots produce clicks readily. That is why CTR on remnant looks more informative than it is. Our August 2026 Supply Bench pull showed 93.4 percent of placements with zero clicks taking 64 percent of spend, and seven domains producing 41.3 percent of clicks from 4.7 percent of impressions. msn.com repeated a high CTR across flights. No IVT vendor was attached.

Remnant is a classroom for isolated funnels and supply-grain excludes. It is a poor classroom for "the brand is working" stories. Use click-to-page-view (15.85 percent usable and 3.75 percent poor on anonymized main-seat brand-name display) and, once tagged, IVT.

See CTR is a trap and the Supply Bench scorecard.

Related

Glossary
Open exchange

Unreserved remnant auctions across SSPs. The default path our public display tests have actually flown.

Notes
CTR is a trap

Click-through rate looks like a quality score on remnant display. On our flights it mostly measured how clicky the inventory was, not whether a person arrived.

Benchmarks
Supply Bench wave scorecard

Dated remnant scorecard from August 2026 Supply Bench waves. Partial coverage. No IVT vendor. Not an industry average.

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