[SB Energy Files for IPO, Backed by Investments and Guarantees from OpenAI and Nvidia] SoftBank-backed SB Energy has filed for an IPO, with a contract backlog amounting to $439 billion and 8.8GW of data center capacity. OpenAI has invested $500 million and secured approximately $5.5 billion in warrants, while also signing a lease agreement. Nvidia has pledged to invest $1.5 billion at the IPO price and provided a guarantee of up to $105 billion for OpenAI's 4.25GW lease in Ohio.