How do advertisers buy CTV ad space?

Overview

Connected TV (CTV) advertising represents the digital evolution of television marketing, where ads are delivered through internet-connected devices like smart TVs, streaming sticks, and gaming consoles. The CTV advertising market emerged in the early 2010s alongside the rise of streaming services, with significant growth accelerating after 2015 as cord-cutting became mainstream. By 2020, CTV ad spending reached $8.1 billion in the U.S., growing to $25.9 billion by 2023 according to eMarketer data. This rapid expansion was fueled by the pandemic-driven streaming boom, with platforms like Roku (launched 2008), Amazon Fire TV (2014), and Apple TV (2007) becoming household staples. The market is dominated by major players including Roku with approximately 25% U.S. market share, Amazon with 16%, and Google/Android TV with 10%, while traditional broadcasters like Disney and NBCUniversal have launched their own ad-supported streaming platforms to capture this growing revenue stream.

How It Works

Advertisers access CTV inventory through three primary methods: programmatic buying, direct deals, and self-service platforms. Programmatic buying, which accounts for approximately 70% of CTV ad purchases, uses demand-side platforms (DSPs) like The Trade Desk or Google DV360 to automatically bid on available ad slots in real-time auctions. These systems employ sophisticated targeting capabilities including demographic data, viewing history, and geographic location, with the average CPM (cost per thousand impressions) ranging from $20-$40. Direct deals involve negotiations between advertisers and specific CTV platforms or publishers for premium placements, often including guaranteed viewership numbers and custom creative formats. Self-service platforms like Roku's OneView allow smaller advertisers to purchase inventory directly with minimum spends as low as $500. The technical process involves ad servers delivering video files to CTV devices via VAST (Video Ad Serving Template) tags, with measurement provided through third-party verification services like Nielsen or Comscore that track metrics including completion rates (typically 95%+), viewability, and audience demographics.

Why It Matters

CTV advertising matters because it combines television's storytelling power with digital advertising's precision and measurability, reaching cord-cutters who are inaccessible through traditional TV. With 87% of U.S. households having at least one CTV device according to 2023 Leichtman Research Group data, advertisers can target specific audiences more effectively than with linear TV, reducing wasted impressions by up to 40%. The format drives higher engagement with average completion rates exceeding 95% compared to 77% for mobile video ads. For the advertising industry, CTV represents the fastest-growing digital channel, with spending projected to reach $38.5 billion by 2025, fundamentally reshaping media budgets. For consumers, it enables free or reduced-cost access to streaming content while raising concerns about data privacy and ad frequency, with the average CTV viewer seeing 12-15 ads per hour on ad-supported platforms.