MarketsSoftBank Group plunges 13% after OpenAI says IPO will not come this yearThe rapid growth of AI has sparked concerns over security and potential misuse of the technology, putting a damper on AI stocks. (Source photos by Hiroki Endo and Yutaka Miyaguchi) JADA NAGUMOSeptember 14, 2026 12:36 JSTTOKYO -- Stocks tumbled in Japan and across Asia on Monday morning, led by a sell-off in tech shares triggered by calls to slow the development of artificial intelligence due to safety concerns. This, in turn, has led ChatGPT creator OpenAI to delay its planned initial public offering.