Observed Signal · Oct 29, 2025 · M&A · Source: VideoWeek · Impact: 3/5 · Sentiment: Positive
Walmart CastOS to Dominate North America CTV OS, Omdia
Walmart’s $2.3 billion acquisition of TV maker VIZIO gives Walmart ownership of CastOS, VIZIO’s smart TV operating system, expanding its access to TV viewership data and the ability to layer retail data into TV buys. New Omdia data projects CastOS to reshape the North American smart TV OS market, forecasting CastOS to command 30% of shipments by 2029, up from 13% today, ahead of Roku (31%), Samsung’s Tizen (22%), and FireTV (14%). The shift follows Walmart’s consolidation of its Onn brand from Roku’s OS to CastOS, with the transition expected to accelerate over the next year. Walmart’s ACR data from CastOS TVs enables measurement and attribution, access to inventory on the home screen and VIZIO’s free ad-supported channels, and the rollout of new shoppable ad formats. The move strengthens Walmart’s negotiating leverage with other TV brands and could spur retailer-led consolidation in North America, while Android remains the global lead and Europe may see similar trends.
Retailer-led OS consolidation in North America is expected to reshape the NA CTV OS landscape.
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Key Takeaways & Evidence Grounding
- Walmart's $2.3B acquisition of TV manufacturer VIZIO last year, gaining CastOS.
- CastOS is VIZIO's owned-and-operated smart TV operating system.
- CastOS current shipments share is 13%, behind Roku 31%, Tizen 22%, and FireTV 14%.
- Omdia projects CastOS to reach 30% of NA shipments by 2029 (Roku 13%, Tizen 20%, FireTV 18%).
- Onn brand will migrate from Roku OS to CastOS over the next year.
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Walmart, Amazon to Control Nearly Half of TV OS Market
A new Omdia forecast, reported by State of Streaming, projects retailers will control nearly half of the North American TV operating system market by 2029 as retailers prioritize e-commerce and advertising over hardware margins. Walmart’s acquisition of Vizio is accelerating its CastOS footprint—projected to reach almost 15 million units—while Amazon’s Fire TV is forecast at nearly 9 million units. Together they could command roughly 24 million units in an estimated 50 million-unit TV OS market. CES 2026 showcased the trend toward commerce-first TVs: Hisense is rebranding VIDAA to “V Home OS” with Microsoft Copilot AI integration, and Google is embedding Gemini AI into Google TV to enable interactive, shoppable video experiences and conversational shopping paths.
Walmart's Vizio Deal Transforms TV Advertising Landscape
Adweek reports that Walmart’s acquisition of Vizio gives the retailer an operating system and direct access to living-room smart TVs, creating new opportunities for retail media beyond search and e-commerce placements. With Walmart already responsible for roughly a third of U.S. TV sales, preloaded TV OSes can connect content discovery, ads, payment credentials and commerce to enable shoppable, audience-targeted experiences on the home screen. Tinuiti ran audience-based campaigns in Walmart’s Vizio CTV beta in H2 2025, demonstrating the ability to layer retailer purchase data onto TV exposure. The upcoming 2026 World Cup and a refresh cycle for TVs are expected to expand CTV inventory and home-screen ad impressions, prompting marketers to plan for increased supply, experiment with interactive placements (sponsored discovery tiles, pause ads, home-screen placements) and adapt measurement for shortened click-to-cart purchase paths.
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