Larry Ellison, the 81-year-old co-founder of Oracle, has leapfrogged Elon Musk to become the world’s richest individual after a surge in demand for artificial intelligence services sent Oracle shares soaring. The company’s stock jumped more than 40 per cent in New York trading on Wednesday, boosting Ellison’s net worth by $101 billion in a single day and taking his total fortune to $393 billion, according to Bloomberg’s Billionaires Index. The dramatic rise underscores the extraordinary...