April 22 : Robinhood's venture fund said on Wednesday it has invested $75 million in OpenAI, allowing retail investors exposure to one of the world's hottest privately held AI companies. Robinhood Ventures Fund I, which went public in March, aims to open up retail investors' access to private-company investments long dominated by Silicon Valley's largest venture capital firms. OpenAI, last valued at $852 billion, has emerged as a poster child of Wall Street's AI frenzy and remains one of the