A federal judge in San Francisco began hearing evidence Thursday on the Federal Trade Commission’s effort to temporarily block Microsoft’s $69 billion acquisition of Activision Blizzard, putting the largest proposed video-game deal in history through a concentrated test of whether control of Call of Duty and other major franchises could harm competition in consoles, game subscriptions and cloud gaming.

The FTC is asking U.S. District Judge Jacqueline Scott Corley to prevent Microsoft and Activision from closing while the commission’s separate administrative challenge proceeds. The agency’s June 12 federal complaint argues that a temporary injunction is needed because the companies could otherwise consummate the transaction before the FTC’s internal tribunal resolves the merits. Microsoft says the acquisition will expand access to Activision games and that contractual commitments can address concerns about foreclosure.

A fast federal case before a looming deal deadline

The Northern District of California issued a temporary restraining order on June 13 barring the companies from closing the transaction while the court considers preliminary relief. The order set an evidentiary hearing beginning June 22. A follow-up hearing order explained that Section 13(b) of the FTC Act requires the court to assess the commission’s likelihood of ultimate success and balance the equities.

The compressed schedule reflects the transaction’s contractual timetable. Microsoft agreed in January 2022 to acquire Activision Blizzard, publisher of Call of Duty, World of Warcraft, Diablo, Overwatch and Candy Crush. The deal would unite one of the world’s largest game publishers with the owner of Xbox, the Game Pass subscription service, Windows and a growing cloud-gaming operation.

The FTC first challenged the acquisition administratively in December 2022. Its announcement alleged that Microsoft would gain the means and incentive to disadvantage rival consoles and gaming services by changing the price, quality, timing or availability of Activision content. The commission pointed particularly to Microsoft’s earlier acquisition of ZeniMax, parent of Bethesda Softworks, and decisions to make some future titles exclusive to Microsoft platforms.

Call of Duty is central, but cloud gaming may be decisive

Much of the public argument has focused on Call of Duty because of the franchise’s scale and its importance to console players. Sony, whose PlayStation competes directly with Xbox, has argued that control of the title could let Microsoft weaken PlayStation over time. Microsoft has countered by offering long-term arrangements to keep Call of Duty available on competing platforms and by signing distribution agreements with Nintendo and several cloud-gaming providers.

The competition inquiry is broader than one franchise. The FTC’s redacted administrative complaint record covers high-performance consoles, subscription services and cloud gaming. Cloud services are especially important because they can allow users to stream games without owning a powerful console or gaming computer, potentially changing how the market is structured if adoption grows.

Microsoft argues that Activision does not currently place its games on multi-game subscription services or cloud services in a way that supports the FTC’s theory of immediate foreclosure. The FTC responds that merger law can address likely future competitive effects and that Microsoft’s ownership of major content could influence an emerging cloud market before it matures.

Regulators have reached different conclusions

The U.S. proceeding is unfolding against a striking international split. Britain’s Competition and Markets Authority blocked the transaction on April 26 after a lengthy investigation. Its final report concluded that the merger could substantially lessen competition in cloud gaming and that Microsoft’s proposed remedy did not adequately address the agency’s concerns.

The European Commission reached the opposite bottom line in May, conditionally clearing the transaction after Microsoft offered licensing commitments for cloud streaming. The Commission said its investigation found that the acquisition would not harm competition in consoles and that Microsoft would have no incentive to withhold Activision games from Sony because doing so would reduce sales. At the same time, Brussels found concerns in cloud distribution and accepted remedies designed to give European consumers and cloud services rights to stream Activision games. The Commission’s May 15 decision announcement therefore illustrates how regulators can examine similar facts but place different weight on market definition, future cloud growth and enforceability of remedies.

Britain’s CMA, by contrast, said structural uncertainty in cloud gaming made Microsoft’s proposed behavioral remedy too difficult to monitor and adapt. Its investigation summary stresses the agency’s view that preserving existing competitive conditions is preferable to regulating the terms of a merged company’s access commitments for years.

The hearing tests evidence, not the final administrative case

The federal hearing is not the FTC’s full administrative trial. Instead, the commission seeks provisional relief so its internal process can occur before the deal closes. That distinction affects the legal standard and the evidence the judge is being asked to weigh. The court must decide whether the FTC has raised a sufficiently serious case about the merger’s legality and whether the equities support preserving the status quo.

Executives and industry witnesses are expected to address Microsoft’s strategy, the importance of Activision content, the economics of Game Pass and the development of cloud gaming. Contemporary reporting on the hearing schedule noted that the court expanded what was originally planned as a shorter proceeding into several days of testimony, reflecting the amount of evidence and the transaction’s complexity.

Microsoft and Activision have denied that the acquisition would substantially lessen competition. Their position is that combining the companies will enable wider distribution, particularly through cloud services, and that the signed licensing agreements demonstrate an incentive to make games available rather than restrict them. The FTC’s position is that promises made to secure a merger should not substitute for preserving competition where a combined company would control valuable content and distribution channels.

A decision with consequences for gaming and merger enforcement

The case arrives as technology markets are increasingly organized around ecosystems rather than single products. Microsoft competes through hardware, operating systems, subscription bundles, cloud infrastructure and content. Activision contributes blockbuster intellectual property and a large player base. The antitrust question is whether combining those assets creates efficiencies and broader access or gives Microsoft durable leverage over rivals at multiple layers of distribution.

The international divide makes the court’s role more consequential. Approval in the European Union has not solved the U.K. prohibition, and an American injunction could create another independent barrier. Conversely, denial of the FTC’s request would increase pressure on the commission’s administrative timeline and bring the companies closer to a possible closing, subject to other legal constraints.

As of Saturday, the evidentiary hearing is still underway and no final U.S. judicial decision has been issued. The court is evaluating a record that includes Microsoft’s licensing promises, the FTC’s foreclosure theories, rival-platform evidence and projections about cloud gaming. That uncertainty is the central fact of the moment: a $69 billion technology acquisition is caught between different regulatory theories on three major markets, and the U.S. proceeding is now testing those theories in open court.