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StocksMediumUpdated×10•Originally published 28 April 2026•Updated 29 April 2026•

1 min read

SoftBank Shares Plunge Most in Six Months on Reports OpenAI Missed Targets

Masayoshi Son behind gold bars labeled Vision Fund and AI Exposure, with a damaged SoftBank building.

Key Facts

1SoftBank Group shares in Tokyo suffered their worst single-day percentage loss in six months.

about 1 month ago

Version History

1 additional source confirmed this story

Version 10about 1 month ago

Version 9about 1 month ago

What changed: Added details from CNBC regarding concerns over OpenAI's ability to fund data center spending following the revenue miss.

Version 8about 1 month ago

What changed: Identified The Wall Street Journal as the reporting source and specified that both revenue and user growth targets were missed.

Version 7about 1 month ago

What changed: Updated the story to highlight that the OpenAI reports have stalled the broader AI sector market rally.

Version 6about 1 month ago

What changed: The story was updated to include OpenAI's formal denial of the reports claiming it missed its internal revenue targets.

Version 5about 1 month ago

What changed: Updated with specific decline figures for SoftBank (11%) and Oracle (3.4%), and directly linked the performance stumble to IPO viability concerns.

Version 4about 1 month ago

What changed: Added details regarding concerns over data center expansion funding and the potential impact on OpenAI's IPO timeline.

Version 3about 1 month ago

What changed: Added specific details regarding the nature of OpenAI's missed targets (revenue and user growth) and cited the original reporting source (WSJ).

Version 2about 1 month ago

What changed: Updated to include Oracle's 5% drop linked to a $300B cloud deal, quantified SoftBank's 13% stake in OpenAI, and noted a 3.5% decline in CoreWeave shares.

Version 1about 1 month ago

What changed: Expanded the story to include the impact of OpenAI reports on U.S. tech shares in addition to SoftBank.

SoftBank Group shares plummeted by 11% following reports that OpenAI missed internal revenue targets, a claim the AI startup has since denied. Adding to the company's challenges, a jury has now been selected for the high-profile trial between OpenAI and Elon Musk regarding allegations that the firm abandoned its original founding mission. This legal escalation comes as the broader AI sector faces a pullback, with Oracle and CoreWeave shares dropping by 3.4% and 3.5% respectively. The combination of financial scrutiny and legal uncertainty has heightened market sensitivity toward the sustainability of massive AI investments. Investors are closely monitoring the trial's progress, particularly given SoftBank's significant 13% stake in the company. These developments represent a critical reality check for the AI-driven market momentum.