SoftBank has announced a$6.5 billion acquisition of US chip startup Ampere Computing, marking a major step in its investment in AI infrastructure.

The deal, paid entirely in cash, reflects founder Masayoshi Son's growing focus on AI as a transformative technology. Ampere produces data centre CPUs based on an architecture from SoftBank's majority-owned Arm Holdings, with customers including Oracle.

The acquisition follows a series of multi-billion-dollar AI investments by SoftBank, including funding for OpenAI, the Stargate AI data centre project, and Cristal, an AI services joint venture in Japan.

Ampere, founded in 2018 by former Intel president Renee James, developed its own custom CPU cores-an approach typically seen in larger firms like Apple and Qualcomm.

Under SoftBank's ownership, the company will operate alongside Arm, strengthening SoftBank's growing collection of AI-focused chip technology firms.

Masayoshi Son described the move as part of his vision for 'artificial super intelligence,' highlighting the need for advanced computing power.

While SoftBank has seen mixed results in past investments, such as its troubled backing of WeWork, the company continues to place high-stakes bets on emerging technologies.