LONDON — Britain’s top competition regulator on Wednesday moved to block Microsoft‘s acquisition of video game publisher Activision Blizzard.
The measure marks a major blow for the U.S. tech giant, as it seeks to convince authorities that the deal will benefit competition. Microsoft said it plans to appeal the decision.
Shares of Activision Blizzard slumped more than 8% in early U.S. trading. Microsoft shares were up 7% but this was largely linked to the company’s strong earnings report Tuesday.
The U.K. Competition and Markets Authority said it opposed the deal as it raises competition concerns in the nascent cloud gaming market. The CMA previously held concerns about competition in games consoles being undermined but ruled out this concern in a preliminary decision in March.
Microsoft could make Activision’s games exclusive to its cloud gaming platform, Xbox Game Pass, cutting off distribution to other key industry players, the CMA said.
Cloud gaming is a technology that enables gamers to access games via companies’ remote servers — effectively streaming a game like you would a movie on Netflix. The technology is still in its infancy, but Microsoft is betting big on it becoming a mainstream way of playing games.
“Allowing Microsoft to take such a strong position in the cloud gaming market just as it begins to grow rapidly would risk undermining the innovation that is crucial to the development of these opportunities,” the CMA said in a press release Wednesday.
Microsoft offered the CMA remedies in an attempt to resolve its concerns — including “requirements governing what games must be offered by Microsoft to what platforms and on what conditions over a ten-year period.” However, the regulator rejected the proposals.
“Given the remedy applies only to a defined set of Activision games, which can be streamed only in a defined set of cloud gaming services, provided they are purchased in a defined set of online stores, there are significant risks of disagreement and conflict between Microsoft and cloud gaming service providers, particularly over a ten-year period in a rapidly changing market,” the CMA said.
‘Flawed understanding of this market’
Microsoft Vice Chair and President Brad Smith said in a statement that the company remains “fully committed to this acquisition and will appeal.”
“The CMA’s decision rejects a pragmatic path to address competition concerns and discourages technology innovation and investment in the United Kingdom,” Smith said Wednesday.
“We have already signed contracts to make Activision Blizzard’s popular games available on 150 million more devices, and we remain committed to reinforcing these agreements through regulatory remedies. We’re especially disappointed that after lengthy deliberations, this decision appears to reflect a flawed understanding of this market and the way the relevant cloud technology actually works.”
Bobby Kotick, CEO of Activision Blizzard, told employees in a letter Wednesday that the company and Microsoft have “already begun the work to appeal to the UK Competition Appeals Tribunal.”
“We’re confident in our case because the facts are on our side: this deal is good for competition,” he said.
“At a time when the fields of machine learning and artificial intelligence are thriving, we know the U.K. market would benefit from Microsoft’s bench strength in both domains, as well as our ability to put those technologies to use immediately,” Kotick added. “By contrast, if the CMA’s decision holds, it would stifle investment, competition, and job creation throughout the UK gaming industry.”
An Activision Blizzard spokesperson said the CMA’s decision represented “a disservice to UK citizens, who face increasingly dire economic prospects.”
“We will reassess our growth plans for the UK. Global innovators large and small will take note that – despite all its rhetoric — the UK is clearly closed for business,” the spokesperson said.
Executives at the Redmond, Washington-based technology giant believe the acquisition will boost its efforts in gaming by adding lucrative franchises like Call of Duty and Candy Crush Saga to its content offerings.
Sony, in particular, has voiced concern with Microsoft’s Activision purchase. The Japanese gaming giant fears that Microsoft could make Call of Duty exclusive to its Xbox consoles in the long run.
Microsoft sought to allay those concerns by offering Sony, Nintendo, Nvidia and other firms 10-year agreements to continue bringing Call of Duty to their respective gaming platforms.
Microsoft contends it wouldn’t be financially beneficial to withhold Call of Duty from PlayStation, Nintendo and other rivals given the licensing income it generates from keeping the game available on their platforms.
Microsoft’s Smith told CNBC last month that the company is offering Sony the same agreement as it did Nintendo — to make Call of Duty available on PlayStation at the same time as on Xbox, with the same features. Sony still opposes the deal.
The CMA had raised concerns with the potential for Microsoft to hinder competition in the nascent cloud gaming market via its Xbox Game Pass subscription service, which offers cloud gaming among its perks. Microsoft has committed to bring new Call of Duty titles to Xbox Game Pass on day one of its release.
Cloud gaming, or the ability to access games via PC or mobile devices over the internet, is still in its infancy and requires a strong broadband connection to work well. Cloud gaming made up only a fraction of global internet traffic in 2022.
Microsoft still needs to convince other regulators not to block the deal. The EU continues to probe the merger to assess whether it hurts competition, while the U.S. Federal Trade Commission has sued to block the deal on antitrust grounds.
Traders work on the floor at the New York Stock Exchange in New York City, U.S., Dec. 15, 2025.
Brendan McDermid | Reuters
U.S. stocks of late have been shaky as investors turn away from artificial intelligence shares, especially those related to AI infrastructure, such as Oracle, Broadcom and CoreWeave.
The worry is that those companies are running into high levels of debt to finance their multibillion-dollar deals.
The stock lost 2.7% on Monday, while shares of CoreWeave, its fellow player in the AI data center trade dropped around 8%. Broadcom also retreated over concerns over margin compression, sliding about 5.6%.
That said, the broader market was not affected too adversely as investors continued rotating into sectors such as consumer discretionary and industrials. The S&P 500 slipped 0.16%, the Dow Jones Industrial Average ticked down just 0.09% and the Nasdaq Composite, comprising more tech firms, fell 0.59%.
The broader market performance suggests that the fears are mostly contained within the AI infrastructure space.
“It definitely requires the ROI [return on investment] to be there to keep funding this AI investment,” Matt Witheiler, head of late-stage growth at Wellington Management, told CNBC’s “Money Movers” on Monday. “From what we’ve seen so far that ROI is there.”
Witheiler said the bullish side of the story is that, “every single AI company on the planet is saying if you give me more compute I can make more revenue.”
The ready availability of clients, according to that argument, means those companies that provide the compute — Oracle and CoreWeave — just need to make sure their finances are in order.
Tesla testing driverless Robotaxis in Austin, Texas. “Testing is underway with no occupants in the car,” CEO Elon Musk wrote in a post on his social network X over the weekend. Shares of Tesla rose 3.6% on Monday to close at their highest this year.
U.S. collects $200 billion in tariffs. The country’s Customs and Border Protection agency said Monday that the tally comprises only new tariffs, including “reciprocal” and “fentanyl” levies, imposed by U.S. President Trump in his second term.
Ukraine-Russia peace deal is nearly complete. That’s according to U.S. officials, who held talks with Ukraine President Volodymyr Zelenskyy beginning Sunday. Ukraine has offered to give up its NATO bid, while Russia is open to Ukraine joining the EU, officials said.
[PRO] Wall Street’s favorite stocks for 2026. These S&P 500 stocks have a consensus buy rating and an upside to average price target of at least 35%, based on CNBC Pro’s screening of data from LSEG.
And finally…
Customers walk in the parking lot outside a Costco store on December 02, 2025 in Chicago, Illinois.
The logos of Google Gemini, ChatGPT, Microsoft Copilot, Claude by Anthropic, Perplexity, and Bing apps are displayed on the screen of a smartphone in Reno, United States, on November 21, 2024.
Jaque Silva | Nurphoto | Getty Images
Merriam-Webster declared “slop” its 2025 word of the year on Monday, a sign of growing wariness around artificial intelligence.
Slop is now defined as “digital content of low quality that is produced usually in quantity by means of artificial intelligence,” according to Merriam-Webster’s dictionary. The word has previously been used primarily to connote a “product of little value” or “food waste fed to animals”
Mainstream social networks saw a flood of AI-generated content, including what 404 Media described as a “video of a bizarre creature turning into a spider, turning into a nightmare giraffe inside of a busy mall,” that the publication reported had been viewed more than 362 million times on Meta apps.
In September, Meta launched Vibes, a separate feed for AI-generated videos. Days later, OpenAI released its Sora app. Those services, along with TikTok, YouTube and others, are increasingly rife with AI slop, which can often generate revenue with enough engagement.
Spotify said in September that it had to remove over 75 million AI-generated, “spammy tracks” from its service, and roll out formal policies to protect artists from AI impersonation and deception. The streaming company faced widespread criticism after The Velvet Sundown racked up 1 million monthly listeners on without initially making it clear they produced their songs with generative AI. The artist later clarified on its bio page that it’s a “synthetic music project.”
According to CNBC’s latest All-America Economic Survey, published Dec. 15, fewer respondents have been using AI platforms, such as ChatGPT, Microsoft Copilot and Google Gemini, in the last two to three months compared to the summer months.
Just 48% of those surveyed said they had used AI platforms recently, down from 53% in August.
PayPal CEO Alex Chriss speaks at the Global Fintech Fest in Mumbai, India, on Oct. 7, 2025.
Indranil Aditya | Nurphoto | Getty Images
PayPal said Monday that it has applied for approval to form PayPal Bank, which would be able to offer loans to small businesses.
“Establishing PayPal Bank will strengthen our business and improve our efficiency, enabling us to better support small business growth and economic opportunities across the U.S.,” PayPal CEO Alex Chriss said in a statement.
The U.S. Federal Deposit Insurance Corporation will review an application proposing the establishment of PayPal Bank, along with Utah’s Department of Financial Institutions, PayPal said.
The company, which owns popular payment app Venmo, hopes to also offer interest-bearing savings accounts to its customers, the statement said. PayPal already makes credit lines available to consumers and has been trying to expand its roster of banking-like services as it competes with a growing number of fintech companies that are aiming to take business from traditional brick-and-mortar banks.
Shares of PayPal rose 1.5% in extended trading following the announcement.
In October, PayPal said quarterly revenue increased 7% year over year to $8.42 billion, more than analysts had expected. But in 2025 the stock has slumped about 29%, while the S&P 500 index has gained almost 16% in the same period.