Tokyo - SoftBank Group Corp. jumped nearly 20% in early trading after reports emerged that two of its portfolio companies are preparing for US initial public offerings. The surge reflects investor optimism about potential liquidity events from OpenAI and SB Energy Corp., both backed by the Japanese conglomerate.

The rally comes as markets digest speculation about major IPO activity. OpenAI, the artificial intelligence research company, and SB Energy Corp., the renewable energy arm, are reportedly exploring US public offerings that could value each company at billions of dollars. Details remain limited in the reports.

For SoftBank, this development signals hope for monetizing high-profile investments. The 20% gain underscores how much investor sentiment hinges on IPO timelines and valuations. Success could provide fresh cash for SoftBank Group Corp.'s investment strategy.

The moves highlight Tokyo's growing role in global IPO markets. While details remain scarce, the potential listings would mark significant milestones for both companies and demonstrate SoftBank's continued influence in driving major offerings.