September 22, 2026 / SemiMedia / — AMD surpassed $1 trillion in market capitalization for the first time on September 21, becoming the fourth U.S. chipmaker to reach the milestone after NVIDIA, Broadcom and Micron. AMD shares rose 9.6% to $613.31 during the session and later closed at a record $615.52.

The rally came as investor interest returned to AI-related semiconductor companies. AMD has become one of NVIDIA's main competitors in data center GPUs while also expanding its position in server CPUs, networking and complete AI infrastructure systems.

AMD is increasingly moving beyond individual processors toward rack-scale platforms. Its Helios AI system combines Instinct MI400 Series GPUs, EPYC server CPUs, Pensando networking and ROCm software in an integrated architecture for large-scale AI training and inference.

Server CPUs are also becoming a larger part of the AI infrastructure opportunity as agentic AI and inference workloads increase demand for host processing, databases, retrieval, orchestration and other supporting workloads. AMD's data center revenue reached $6.7 billion in the second quarter of 2026, up 107% year over year, driven mainly by strong demand for EPYC processors and Instinct GPUs.

AMD is also expanding AI infrastructure partnerships with companies including Meta, Microsoft, OpenAI and Anthropic as it seeks broader deployments of its GPUs, CPUs and rack-scale systems.

NVIDIA became the first U.S. chipmaker to cross the $1 trillion valuation mark in 2023 and is now valued at more than $5 trillion. AMD's entry into the $1 trillion group reflects growing expectations that AI infrastructure spending will continue to support demand across GPUs, server CPUs and integrated AI systems.