It’s the biggest stock market float in history – and one that is set to mint the world’s first trillionaire.

We will find out just how much Elon Musk and his SpaceX rockets-to-chatbots enterprise venture is worth after trading in the much-hyped shares begins this afternoon in New York.

Early indications suggest the shares, priced at $135 each (£100.65), could jump by as much as 35pc on opening, valuing SpaceX at an astonishing $2.4trillion after the offer was heavily oversubscribed, meaning demand for the shares far outweighed supply.

But how will they fare in the days, weeks and months ahead? Can they continue to defy gravity?

Musk is Marmite. Few people divide opinion as much as the soon-to-be trillionaire tech tycoon.