SpaceX is advancing an insider share sale that sets the company’s valuation at roughly 800 billion US dollars, a move that could pave the way for the largest initial public offering of all time.

The sale comes as SpaceX outlines ambitious plans for the coming years. The company is aiming to accelerate the Starship rocket programme, deploy artificial intelligence data centres in space, and establish a base on the moon. In its latest secondary offering, the company set the per-share price at 421 US dollars, nearly double the 212 US dollars per share in July, when the firm was valued at 400 billion US dollars.

Chief Financial Officer Bret Johnsen, in a memo to shareholders seen by Bloomberg, said the tender is part of a regular process that allows employees and investors to buy or sell shares, while also establishing a market benchmark ahead of a possible IPO in 2026. Johnsen added that the timing of a public listing and the final valuation remain uncertain.

If realised, SpaceX’s full valuation could reach approximately 1.5 trillion US dollars, approaching the scale of Saudi Aramco’s 2019 market debut. The IPO could raise more than 30 billion US dollars, making it the largest listing in history if the company proceeds.

SpaceX, which dominates the commercial space launch sector with its Falcon 9 rocket, also leads in satellite internet through its Starlink constellation, serving millions of customers worldwide. The IPO and insider share sale are seen as crucial steps in financing the company’s high-risk, high-reward projects in orbit and beyond.