> ## Content Index
> Fetch the complete content index at: https://www.medianexis.com/llms.txt
> Use this file to discover other available public pages before exploring further.

# VAB: Nielsen undercounting cost TV $690 million in ad inventory
- URL: https://www.medianexis.com/vab-nielsen-undercounting-cost-tv-690-million-in-ad-inventory/
- Published: 2026-10-01T16:06:00.000Z
- Updated: 2026-10-01T16:06:00.000Z
- Description: Inside Radio reports that the Video Advertising Bureau’s updated analysis found Nielsen’s out-of-home TV undercount, which ran from September 2020 to December 2021, erased 54 billion ad impressions worth an estimated 690 million dollars in unsold inventory.
- Author: The Signals Desk
- Tags: Measurement, Old archival: VAB Nielsen undercounting estimate (2022)

**Why it matters.** Sellers and buyers now have a trade group’s dollar figure to cite when disputing Nielsen’s own smaller estimate of the error’s impact.

*Signal from* [*insideradio.com*](https://insideradio.com/?ref=medianexis.com) *·* [*read the original*](https://www.insideradio.com/free/vab-estimates-690m-in-ad-inventory-lost-from-nielsen-tv-undercounting/article%5Fa5b596a0-b579-11ec-bd10-b75a110bde99.html?ref=medianexis.com)*.*