SoftBank Shares Plunge 20% as OpenAI Funding Commitments Spark Concern

Key Facts

1SoftBank shares have fallen by a fifth in the last week, losing its position as Japan's most valuable company.

2Potential creditors are concerned about funding commitments for OpenAI and the company's failure to meet ambitious internal growth targets.

Amid shifting dynamics in the global AI sector, SoftBank Group has faced intense selling pressure, causing its shares to lose a fifth of their value over the past week. According to reports, this decline has forced the company to relinquish its position as Japan's most valuable firm by market capitalization. The sell-off is primarily driven by mounting concerns among potential creditors regarding the scale of funding commitments required for OpenAI and the startup's failure to meet its ambitious internal growth targets.

This downturn occurs despite a relatively stable domestic economic backdrop, with Japan's annualized GDP growth reported at 1.8% on June 7, 2026, beating the 1.3% forecast. However, SoftBank's heavy concentration in high-stakes AI ventures has decoupled its performance from broader market trends. Per market data, investors are increasingly scrutinizing the sustainability of OpenAI's capital-intensive model as internal growth metrics reportedly fall short of the aggressive projections previously shared with institutional backers.

At the close of June 12, 2026, SoftBank's primary listing (9984.T) stood at 6,472 JPY, having touched a session low of 6,373 JPY. Moving forward, the key catalyst to watch will be any official confirmation regarding OpenAI’s next funding round or revised growth guidance. Traders should also monitor broader tech sentiment and upcoming Japanese economic indicators, as the stock remains highly sensitive to global risk appetite and institutional credit conditions.