Britain’s Competition and Markets Authority has announced plans to designate tech giants Apple and Google with Strategic Market Status for their dominant roles in mobile ecosystems, escalating regulatory scrutiny of what it describes as a “duopoly” in the mobile browser market.

The move follows the findings of a CMA inquiry group which concluded that several markets—particularly those related to mobile internet browsers—are failing to deliver fair outcomes for consumers and developers.

Apple’s Safari and Google’s Chrome browsers currently dominate usage on iOS and Android devices respectively, raising concerns over limited competition and barriers to innovation.

“Apple and Google’s mobile platforms are both critical to the UK economy,” said CMA Chief Executive Sarah Cardell. “But our investigation so far has identified real opportunities for greater innovation and consumer choice.”

The regulator says the proposed SMS designation would empower it to enforce tailored interventions, such as mandating changes in business conduct to foster fair competition and allow UK app developers to thrive.

A final decision on the designations is expected by October 22, with roadmaps for potential regulatory action also published alongside the announcement.

Under SMS rules, companies may be required to follow stricter behavioural guidelines and could face new obligations to promote competition in their markets.

Both companies have pushed back against the move. Google described the proposal as “disappointing and unwarranted,” warning that new regulations must remain “evidence-based and proportionate.” Apple expressed concern that the changes could “undermine the privacy and security protections” its users expect.

The decision forms part of a broader push by UK and EU regulators to rein in Big Tech’s dominance, amid growing calls to ensure a more competitive digital landscape.