The news: The Television Bureau of Advertising (TVB) is urging Nielsen to provide a more accurate picture of total ad-supported TV viewing, according to a TVB email cited by The Desk. A TVB representative said Nielsen’s Ad-Supported Gauge product is “missing key context” needed to understand today’s viewing landscape.

• TVB, which represents the broadcast TV industry, argues that Nielsen’s estimate of streaming’s share of ad-supported viewing—46.6% in Q1—is overstated.
• TVB noted that Nielsen did not include the Advertising Research Foundation’s DASH data showing lower broadband-only household penetration in Q1. That higher estimate “could inflate streaming’s audience and undercount linear audiences,” TVB stated.
• DASH estimates were missing despite Nielsen committing to using the data in February; Nielsen previously said that DASH-related estimates will be incorporated starting in September.
• TVB also took issue with Nielsen’s inclusion of the P2+ demographic in viewership figures, noting that young children are rarely included in advertiser transactions.

Zooming out: This isn’t the first critique lodged against Nielsen recently.

• The Media Rating Council (MRC) in March stated that it had found “unusual changes in measurement results” with Nielsen’s Big Data + Panel product; MRC noted issues like a 10% decline in total day impressions for consumers ages 25 to 55 in H1 2025, problems with demographic and household viewing data, and changes in the variability between Big Data + Panel and Panel-only results.
• Shortly after, NBCUniversal alleged that Nielsen underreported traditional TV viewership to the detriment of its largest clients. This came after Nielsen postponed an update to its Gauge report that would have incorporated data from the Advertising Research Foundation; updated estimates would have increased reported audiences for broadcast and cable.
• The NFL’s chief data and analytics officer criticized Nielsen in 2025, stating that Nielsen’s approach to measurement was “systematically undercounting” millions of viewers.

Competition mounts: Even as Nielsen remains the dominant leader in TV measurement, continued criticism and speculation on the accuracy of its measurements is opening doors for competitors. Measurement competitors like VideoAmp, Comscore, and iSpot already have a mix of support from major media networks like Paramount, Disney, and NBCU.

Combined with the 85% of advertisers who stated alternative currencies were just as or more effective than Nielsen in 2024, that scrutiny could accelerate the industry’s shift toward competing measurement providers.

Implications for marketers: Mounting scrutiny and contested impression figures could make marketers more hesitant to rely solely on Nielsen’s data for planning and measurement purposes.

Amid questions about the validity of Nielsen’s data, some marketers may shift ad budgets toward competitors that are already gaining traction. That could give marketers more leverage to push for measurement transparency, test alternative currencies, and negotiate against multiple sources of truth rather than one industry default.

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