Even so, Mr Ellison remains the world’s fifth-richest man, and Oracle the third-biggest software firm. He has a thing or two to teach fellow tech titans, in particular his friend Elon Musk, about ...

The world's richest man, now firmly embedded in the Trump administration, has lost over $11 billion since the start of the year.

The Microsoft co-founder and philanthropist is taking a break from the future to examine his past — and mulling where the billionaires now fit in.