SB Energy, the artificial intelligence power infrastructure company backed by Softbank, OpenAI and Nvidia, has filed for an initial public offering with the Securities and Exchange Commission.Among the risk factors listed in the Tuesday filing, SB Energy said it's "substantially dependent" on the performance of OpenAI as both a tenant and equity investor. OpenAI CEO Sam Altman was an early personal investor in the company as well."This concentration means that our near-term revenues, project-lev...