SpaceX outlined details of its highly anticipated initial public offering at a meeting with its bankers on Monday night, saying it plans to earmark a large portion of shares for retail investors and host 1,500 of them at an event in June following the IPO roadshow launch, according to two people familiar with the matter.

'Retail is going to be a critical part of this and a bigger part than any IPO in history,' Chief Financial Officer Bret Johnsen said during the virtual meeting, the sources said, requesting anonymity as the discussion was private.

Johnsen said the large retail component is intentional, noting that such investors have been 'incredibly supportive of us and of Elon (Musk) for a long time, and we want to make sure that we recognise that.'

Reuters reported last month that SpaceX is rewriting the IPO playbook with a significant retail allocation.

The meeting brought together the full syndicate for the first time as part of preparations for what is expected to be the largest initial public offering on record, as the rocket maker seeks to raise $75 billion, valuing SpaceX at up to $1.75 trillion, Reuters has previously reported.

The company plans to launch its roadshow in the week of 8 June, when executives and bankers will present the IPO to investors, the sources said. Around 125 financial analysts from the 21 banks involved are scheduled to meet the company the day before.

On 11 June, SpaceX plans to host 1,500 retail investors at what the sources described as a major investor event.

In addition to the United States, retail investors in the United Kingdom, European Union, Australia, Canada, Japan and Korea would have the opportunity to participate in the offering, they added.

One of SpaceX's lead underwriters told the group of 21 investment banks that the scale of retail demand and allocation would be something they had 'never seen before', the sources said.