CTV ad spend projected to double by 2027 as buyers demand linear-like controls

The massive influx of premium inventory from major streamers is forcing a technical convergence between digital and broadcast stacks. For the industry, this means ad servers must now support hybrid models that balance the flexibility of programmatic buying with the deterministic frequency and placement controls of traditional linear TV. As buyers shift toward unified campaigns, the absence of standardized measurement and de-duplicated reach remains the primary bottleneck for scaled investment. Watch for a rise in proprietary 'clean room' solutions as publishers try to satisfy the 88% of buyers who now prefer first-party data for audience targeting.

The transition toward a unified TV advertising market has accelerated significantly in the years since this data was first collected. According to 2026 reporting from Nielsen, streaming now accounts for 66.7% of ad-supported television viewing time among adults aged 18 to 49, marking a structural transition from traditional broadcasting to digital platforms. This shift is reflected in advertiser spend; per the IAB, marketers reallocated an average of 36% of their linear TV budgets to CTV in 2025. This migration is increasingly fueled by the dominance of programmatic transactions, with over 84% of total CTV ad spend likely to be transacted through automated platforms by the end of 2025, according to projections from Amra & Elma in late 2025.

Institutional standards are finally catching up to this technical fragmentation. In April 2026, the Media Ratings Council (MRC) ended a six-month grace period on enhanced brand safety terminology, requiring vendors to possess content-level analysis capabilities—including video and audio—to retain accreditation. This move directly addresses the 86% of buyers who cited 'linear-like' control and brand protection as critical needs. Furthermore, in January 2025, IAB UK expanded its 'Gold Standard' to include CTV, forcing certified platforms to align with standardized definitions for viewability and invalid traffic. These regulatory shifts respond to the fact that nearly 90% of U.S. households can now be reached through open programmatic markets, as reported by Pixalate in early 2023.