Why is SoftBank Group stock tumbling today?

SoftBank Group Corp. experienced a sharp decline of 4.2%, trading at ¥3,710 on Wednesday, following the announcement of a staggering ¥1.12 trillion ($7.1 billion) net loss for its fiscal second quarter ending on September 30, 2026. This loss marked a drastic departure from the ¥2.5 trillion profit achieved in the same quarter the previous year, significantly surpassing the consensus estimate of a ¥129 billion profit.

The primary driver of the loss was a $3.7 billion charge linked to advance payments for power-generation equipment for SoftBank's US AI data center projects, including an 8-gigawatt facility in Ohio, which were canceled due to revised procurement plans. Additionally, financing costs more than doubled during the quarter, intensifying the financial pressure.

SoftBank's net asset value declined by 17% during the period, largely due to a 23% drop in Arm Holdings' share price, which constitutes about 54% of the company's total asset value. The Vision Fund segment recorded a loss of ¥81.6 billion, compared to a profit of ¥2.38 trillion the prior year, as declines in Intel and Coupang shares further diminished returns.

The Nikkei 225 index only managed a modest 0.1% increase on the day, indicating that SoftBank's decline was not influenced by broader market conditions. SoftBank's stock had previously surged nearly 14% in the previous session amid a market-wide AI and technology rebound in Asia, only to lose those gains and more following the earnings announcement.