The UK’s Competition and Markets Authority (CMA) has officially closed its investigation into Microsoft’s partnership with OpenAI, concluding that the tech giant does not have enough control over the AI startup to warrant further scrutiny.
The Background of Microsoft and OpenAI’s Collaboration
Microsoft and OpenAI’s partnership began in 2019 when Microsoft invested $1 billion into the AI research company. Since then, their collaboration has expanded, with Microsoft integrating OpenAI’s technology into its products, including Azure cloud services and its Copilot AI assistant.
However, concerns about the nature of this partnership intensified after OpenAI’s internal leadership crisis in 2023, when CEO Sam Altman was ousted and then reinstated within days. This event raised questions about Microsoft’s influence over OpenAI’s decision-making, prompting the CMA to launch an antitrust review.
Why the CMA Dropped the Investigation
After careful review, the CMA determined that while Microsoft does have “material influence” over OpenAI, it does not exercise de facto control over the company. This means Microsoft’s involvement doesn’t meet the legal criteria for a formal merger review under UK regulations.
Despite this decision, the CMA clarified that this does not mean the partnership is free from competitive concerns. Regulators worldwide, including those in the U.S., continue to monitor relationships between major tech firms and AI startups to ensure fair competition.
What This Means for the AI Industry

The CMA’s decision signals a more flexible regulatory approach to AI partnerships, at least for now. This could encourage more collaborations between tech giants and AI companies without the immediate risk of regulatory roadblocks.
However, the CMA has also been broadening its oversight capabilities. With new powers granted this year, the regulator now has the authority to investigate large tech firms if they hold “strategic market status.” It has already launched inquiries into Apple, Google, and Amazon regarding their dominance in various digital markets.
The Future of AI and Big Tech Scrutiny
While Microsoft and OpenAI have avoided regulatory intervention this time, increasing scrutiny of AI investments suggests that global regulators are keeping a close eye on the industry. With AI technology evolving rapidly, future partnerships could still face antitrust challenges if authorities believe they limit market competition.