Interactive Brokers announced on Friday that it will open access to the SpaceX initial public offering for eligible UK clients, positioning itself as one of the first brokers to provide a channel for UK retail investors to participate in what is set to be the largest IPO in history.

According to the announcement, Interactive Brokers' UK clients can submit subscription applications through its trading platform until June 10. This window follows closely after SpaceX filed updated prospectus documents with the U.S. Securities and Exchange Commission on June 3, aligning with the company's schedule to list on the Nasdaq on June 12.

The SpaceX IPO plans to issue approximately 5.556 billion shares at $135 per share, aiming to raise up to $75 billion, which would value the entire company at around $1.77 trillion and set a new record for a U.S. stock market debut. Goldman Sachs is acting as the lead underwriter, with Morgan Stanley, Bank of America, Citigroup, and JPMorgan Chase serving as joint underwriters.

Interactive Brokers' move comes as several brokerage firms are competing to secure share allocations for retail investors. Previously, multiple UK platforms, including Hargreaves Lansdown, AJ Bell, Barclays Private Bank, Freetrade, IG, and Revolut, have confirmed participation in the retail allocation for this IPO. It is reported that approximately 30% of the shares offered will be reserved for retail investors, with about $1.5 billion specifically earmarked for UK investors.

It is noteworthy that some brokers have imposed restrictions on short-term selling. For example, Fidelity Investments has warned its clients that attempting to "flip" shares for a quick profit within 15 days of the stock's trading debut will result in a ban from participating in future IPOs. This arrangement is intended to encourage long-term holding and stabilize the stock price in the initial post-listing period.

The SpaceX listing coincides with a busy window for AI company IPOs. AI unicorn Anthropic confidentially filed its prospectus with the SEC this Monday, and OpenAI also plans to submit its listing application in the coming weeks. The concentration of major tech companies entering the public market is emerging as a defining trend for the U.S. stock market in 2026.