CTV upfront spending to surpass primetime linear TV for first time

The transition of upfront budgets from linear to CTV signals that streaming is no longer the secondary platform but the primary driver of television economics. This shift forces a fundamental change in the technology stack, moving away from legacy reach and frequency metrics toward real-time, AI-driven performance optimization. For publishers, the ability to demonstrate concrete business outcomes—such as direct sales or app installs—will be the key differentiator between premium inventory and commoditized impressions. Watch for a rapid consolidation of measurement standards as buyers and sellers seek a 'common source of truth' to justify premium CPMs in a high-supply environment.

The 2026 milestone reflects a broader structural change where digital video and CTV combined now represent approximately 23% of total U.S. ad spend, per the IAB. This trajectory is largely fueled by a significant reallocation of budgets; IAB reporting from June 2026 suggests marketers moved roughly 36% of their linear TV spend to CTV during the 2025 cycle. While total CTV ad spending is forecast to hit $37.95 billion this year, a persisting 'attention gap' remains highlighted by Nielsen data showing CTV holds 43.8% of usage but captures significantly less of the total ad wallet compared to linear.

Technological maturity is also shifting how this inventory is accessed. Per StackAdapt in March 2026, programmatic activation has become the standard, with 84% of CTV inventory now bought through automated platforms. This programmatic shift supports the industry-wide move toward biddable supply, which increased from 34% in 2024 to 47% in 2025. This flexibility allows brands to optimize campaigns in real time, moving CTV closer to the performance-centric models of search and social media advertising.

Major platforms are already capitalizing on this accountability trend. Per Adwave in July 2026, the share of small-business advertisers investing in CTV jumped from 60% in 2024 to 85% in 2026, primarily due to lower entry barriers and the ability to measure localized impact. As linear TV sales continue a structural decline—falling 3.2% in 2024 according to industry trackers—the influx of both national upfront dollars and performance-driven local budgets is expected to push total CTV spending past the $50 billion mark by 2029.