May 20, 2026 emerged as one of the most dramatic days in tech capital market history: just hours before Elon Musk’s SpaceX was set to unveil its IPO prospectus, CNBC confirmed OpenAI is gearing up to confidentially file a draft prospectus as early as this Friday. What was supposed to be a staggered trillion-dollar IPO showdown has morphed into a head-to-head race. With SpaceX valued at $1.75 trillion and straddling both aerospace and AI, and OpenAI—valued at $852 billion—having defined the generative AI era, the race to secure 2026’s title of “greatest IPO of all time” is accelerating toward a conclusion.
The IPO race’s timeline is steeped in deliberate rivalry. SpaceX quietly filed a confidential S-1 with the U.S. Securities and Exchange Commission (SEC) on April 1 under the internal codename “Project Apex,” with plans to release its prospectus to investors on May 20. That would be followed by a global roadshow starting June 4, pricing on June 11, and a Nasdaq listing under the ticker “SPCX” on June 12. Newly disclosed details show SpaceX aims to raise $75 billion to $80 billion in its IPO, led by Goldman Sachs as lead underwriter, with Morgan Stanley, Bank of America, Citigroup and JPMorgan Chase rounding out a 21-bank underwriting syndicate.
OpenAI’s entry has upended SpaceX’s plans entirely. Sources familiar with the matter told Bloomberg, CNBC and The Wall Street Journal that OpenAI and CEO Sam Altman are moving the company’s listing target up to fall 2026. A prospectus, co-developed with Goldman Sachs and Morgan Stanley over months, could be filed confidentially as early as this Friday—coinciding with SpaceX’s expected prospectus release. Axios put it bluntly: OpenAI’s timing in announcing its IPO progress “is clearly designed to steal the spotlight from Elon Musk’s upcoming SpaceX IPO.”
More notably, the two trillion-dollar firms have not only opted for the same exchange but also share core underwriters Goldman Sachs and Morgan Stanley. The scenario—top investment banks leading two of the largest IPOs in history simultaneously—has no parallel in modern equity capital market history.
On paper, SpaceX holds a clear edge. Valued at $1.25 trillion in a February 2026 private funding round, the company has lifted its IPO target valuation to roughly $1.75 trillion, with a fundraising haul that would shatter all global IPO records. Following its merger with xAI earlier this year, SpaceX is no longer merely an aerospace firm but one of the few tech giants with expertise in both aerospace infrastructure and large-language model technology—dual pillars supporting its valuation.
OpenAI, meanwhile, was valued at $852 billion after a $122 billion mega-funding round in March 2026, with its bankers pushing for a $1 trillion valuation in the IPO. Reuters previously reported OpenAI planned to raise a minimum of $60 billion, but market expectations for its actual fundraising have surged following the latest round.
Both companies face significant fundamental headwinds. Despite boasting 700 million weekly active users and $20 billion in 2025 annualized revenue—a sharp jump from $6 billion in 2024—OpenAI has repeatedly missed internal monthly revenue targets in 2026, with ChatGPT’s weekly active users stagnating at around 900 million, short of internal goals. More critically, OpenAI has committed $1.4 trillion over the next seven to eight years to data center construction, with massive capital expenditure pressures pushing its profitability target to 2030. Adding to the competition, Anthropic—also eyeing a late-2026 IPO—has overtaken OpenAI, capturing 31.4% of global LLM revenue in Q1 2026 versus OpenAI’s 29%. Anthropic’s annualized revenue has soared from $9 billion at the end of 2025 to over $30 billion in April 2026, with 80% coming from enterprise clients, and it expects to break even by 2028—two years ahead of OpenAI’s 2030 target. That gap will deeply shape investor valuations of OpenAI and the broader AI sector.
The IPO showdown’s impact stretches far beyond the two companies. Estimates indicate that if SpaceX, OpenAI and Anthropic all list with a 5% free float, their combined fundraising will near $200 billion—surpassing the total proceeds from all U.S. IPOs with a market cap above $500 million between 2022 and Q1 2026. The capital siphon effect is already evident: the Invesco QQQ ETF, which manages roughly $466 billion in assets, has begun modeling portfolio adjustments to accommodate passive buying demand once the three firms join the Nasdaq 100 index. Stocks of companies with large OpenAI stakes, including Microsoft and SoftBank, will also see sharp fluctuations as their holdings are marked to market following OpenAI’s listing.
Most critically, the first to list will set the first public market valuation benchmark for pure AI players. Both OpenAI and SpaceX—via its xAI unit—will have their post-IPO pricing directly set the valuation ceiling and floor for subsequent AI firms like Anthropic. The first mover will not only lock in fundraising at the peak of market sentiment but also seize narrative control over the entire AI industry.
While SpaceX currently leads in fundraising scale, valuation and listing timeline, OpenAI still has a path to a comeback. The winner of 2026’s IPO crown will hinge on three core variables: the sustainability of market sentiment, the ability to deliver on profit expectations, and the battle for narrative control. OpenAI’s decision to accelerate its IPO stems partly from fears of a potential AI growth slowdown and valuation pullback; if investor enthusiasm for AI stocks cools before OpenAI’s September listing, SpaceX’s June IPO will be the undisputed winner. Investors are increasingly shifting focus from revenue growth to profit outlooks, with Anthropic’s earlier profitability timeline pressuring OpenAI—while SpaceX’s more stable cash flow from its aerospace operations could earn it a valuation premium. OpenAI’s sudden IPO announcement is essentially a narrative battle against SpaceX, and stronger technological progress or enterprise client growth in the coming months could reverse market expectations and make it the standout of the IPO wave.
Regardless of the outcome, the IPO showdown between OpenAI and SpaceX will go down in capital market history. More than a personal rivalry between two tech giants, it marks the first public market clash between the future-focused aerospace and AI industries—and will redefine the valuation system and capital flows of the global tech sector over the next decade.
