SoftBank Surges to Record High, Tops Toyota as Japan's Most Valuable Firm on AI Hype

SoftBank Group Corp (9984) pushed its shares to a fresh peak this week, climbing more than 13% to reach 8,546 yen. Riding a wave of enthusiasm around artificial intelligence, the business has overtaken Toyota as Japan's largest publicly traded company by market capitalization.

The jump propelled SoftBank's valuation to 48 trillion yen, or approximately $305.8 billion, giving it a new stature atop the Nikkei 225 index. This milestone comes amid growing investor confidence in the company's investments related to AI chip technology.

A key catalyst behind SoftBank's surge is its dominant shareholding in Arm Holdings (ARM), the British chip designer whose architecture is powering new AI-focused processors. Notably, Arm-based chips announced by NVIDIA Corporation (NVDA) for Windows devices co-developed with Microsoft Corporation (MSFT) have captured market attention.

Arm primarily earns through licensing, so these partnerships hint at substantial recurring revenue. Holding about 90% of Arm, SoftBank indirectly taps into this growing stream, buoyed by a more than threefold rise in Arm's valuation in 2026 alone.

Meanwhile, SoftBank's portfolio has also benefited from gains in AI startups such as OpenAI, with recent disclosures highlighting sizeable profit contributions. The conglomerate's shares have rallied sharply, reflecting the market's appetite for AI exposure through its diverse holdings.

Adding another layer to the story, SoftBank committed €75 billion ($87.3 billion) to build AI infrastructure in France over the next five years, signaling ambitions to deepen involvement in AI development beyond holdings and investments.

Despite its remarkable ascent, the discussion around SoftBank includes observations about its strategy, as it does not manufacture products directly but invests heavily across the tech landscape to capitalize on evolving trends.

This remarkable shake-up in Japan's corporate rankings opens questions about the shifting nature of value creation, with technology and AI pushing conglomerates like SoftBank to the forefront over traditional manufacturers.