Big three digital advertising companies increase market share despite competition

The digital advertising landscape in the United States has been overwhelmingly dominated by Amazon, Google, and Meta, collectively known as the advertising triopoly, as per data from EMARKETER released on July 29, 2025. These three companies have significantly expanded their share of total advertising spend, capturing 58.8% in 2025, up from 47.1% in 2020. However, this growth is not indicative of increased control solely within digital channels but reflects a broader transformation in the digital advertising space as a whole.

According to analysts Emma Noyes, Vladimir Hanzlik, and Eleni Digalaki, the triopoly’s increasing dominance in total ad dollars belies a more intricate competitive environment specifically within digital advertising. While Amazon, Google, and Meta have made substantial gains in absolute terms, their joint control over the digital advertising market has weakened as emerging platforms are chipping away at their market share.

The data illustrates a significant shift in advertiser behavior, with digital advertising’s share of total ad spend skyrocketing from 63.7% in 2020 to 81.8% in 2025, marking one of the most significant shifts in media consumption in recent history. This transition from traditional to digital channels has boosted all major platforms, but newer entrants are steadily encroaching on the market share previously held by the advertising triopoly.

Despite the overall growth in the digital advertising sector, competitive dynamics have evolved dramatically since 2020. The triopoly’s collective market share has actually declined within the digital advertising ecosystem as platforms like TikTok, Reddit, and other emerging services have carved out a niche for themselves in the market. Amazon, in particular, has emerged as a formidable competitor, disrupting the duopoly structure of Google and Meta by growing its advertising business exponentially.

Several factors, including the rapid rise of retail media and the expansion of connected television advertising, have played a role in reshaping the market. The increased adoption of retail media has opened up new revenue streams for Amazon and other retailers, diverting advertising dollars away from traditional digital platforms. Similarly, the growth of connected television advertising has seen platforms like Netflix, Disney+, and Amazon Prime Video expanding their ad-supported offerings, further diversifying the advertising landscape.

Within the search and social media spheres, Google and Meta are facing new challenges from AI-powered search interfaces and emerging social platforms, respectively. The integration of artificial intelligence into search experiences is transforming how users interact with search results, potentially impacting the traditional search advertising model. Meta has heavily invested in AI capabilities to stay competitive, reporting significant performance improvements in return on ad spend through its automated systems. Additionally, traditional social media advertising is facing tough competition from short-form video platforms and creator-focused networks targeting younger demographics with innovative advertising products.

For marketers, these shifts present both challenges and opportunities. Navigating the increasingly fragmented digital ecosystem while maintaining efficiency and measurement capabilities across multiple platforms is essential. The growth of retail media networks has brought about new measurement challenges, prompting calls for increased transparency in fee structures and revenue distribution in digital advertising transactions. Marketers must adapt to this evolving landscape by optimizing their campaigns for maximum impact across different platforms to stay ahead in an ever-changing digital advertising environment.