A float would support Sam Altman's ambitions to splash trillions of dollars on building datacentres. A float would support Sam Altman's ambitions to splash trillions of dollars on building datacentres. OpenAI is reportedly gearing up for a stock market listing valuing the company at $1tn (£760bn) as soon as next year, in what would be one of the biggest ever initial public offerings. The developer behind the hit AI chatbot ChatGPT is considering whether to file for an IPO as soon as the second half of 2026, according to Reuters, which cited people familiar with the matter. The company is thought to be looking to raise at least $60bn.

Uber's self-driving car unit has been valued at $7.3bn (£5.6bn), after receiving $1bn of investment by a consortium including Toyota and Saudi Arabia's sovereign wealth fund. With weeks to go until the loss-making San Francisco firm's stock market float, expected to value the company at up to $100bn, Uber said it had secured new financial backing for its plans to develop autonomous vehicles. Japanese carmakers Toyota and its compatriot Denso, a car parts supplier, will invest a combined $667m in Uber's Advanced Technologies Group (ATG). The remainder will come from Japanese conglomerate SoftBank's $100bn Vision Fund, whose largest investor is Saudi Arabia. Toyota and SoftBank are already major investors in Uber, with the latter owning 16%.