SoftBank Group Corp. shares surged nearly 20% in Tokyo trading.
This rally marks the largest intraday increase since March 2020.
Reports indicate portfolio companies OpenAI and SB Energy are preparing U.S. initial public offerings.
SoftBank holds an approximate 13% stake in OpenAI.
OpenAI reportedly plans to file for an IPO within weeks for a potential fall debut.
SB Energy filed confidentially for a U.S. IPO to support data center energy infrastructure.
The news reversed recent stock losses as investors anticipate monetization of AI-related investments.