Arm and Qualcomm: The Architecture Threatening BothThin moat

The most consequential competitive development for AMD may not involve AMD at all. Arm-based client processors reached 15.3% market share in the second quarter of 2026, up nearly a point in a single quarter¹ — meaning that while AMD and Intel divide the x86 market between them, the x86 market itself is getting smaller as a share of computing.

The data centre is where this gets serious. Arm-based server processors have moved from curiosity to procurement line item, with Ampere established and hyperscalers deploying their own Arm designs at scale. Qualcomm entered the category in June 2026 with an AI data-centre CPU and Meta as a named customer² — a company with no x86 licence, no legacy installed base, and no reason to respect the duopoly's economics.

AMD's protection is real but specific: the enormous body of software written for x86, and the fact that migrating it costs more than the processor saves for most workloads. That argument weakens every year as more software is written for the cloud rather than for an instruction set, and as the largest buyers — who write their own software — find the migration cheap.

Watch Arm's share of server processors rather than client. Client Arm share is largely one competitor's laptops; server Arm share is hyperscalers deciding that the instruction set no longer matters, which is the assumption AMD's entire franchise rests on.