2026 IPO Boom: Spacex, OpenAI and Anthropic

Anthropic has confidentially filed for an IPO, joining SpaceX and OpenAI in a wave of high-profile tech companies preparing to go public with valuations nearing $1 trillion or more, signaling a major shift in the tech investment landscape. These IPOs, coupled with anticipated inclusion in major indexes and significant demand from passive index funds, are expected to influence market dynamics and stabilize aftermarket stock performance despite controversies over fast-tracking private firms into public indexes.

Anthropic has confidentially filed for an IPO with the SEC, signaling its intention to go public likely after Labor Day. While details remain limited due to the confidential nature of the filing, this move reflects the company’s rising valuation, which is approaching $1 trillion. The IPO process is expected to be swift, with some regulatory back-and-forth anticipated but no major delays. This filing comes amid a competitive environment where companies like SpaceX and OpenAI are also preparing for public offerings, highlighting a broader trend of high-profile tech firms entering the market.

The valuations of these companies, including SpaceX at around $2 trillion and OpenAI near $1 trillion, underscore their significant market impact. Index providers are keen to include such large private companies quickly to ensure their funds accurately represent the market landscape. This inclusion is somewhat exceptional but justified given the size and influence of these firms. The demand generated by index funds purchasing shares post-IPO could help stabilize aftermarket stock performance, benefiting both investors and the companies themselves.

Regarding the IPO float, SpaceX plans to offer about $75 billion worth of shares, representing less than 5% of its total valuation. Similarly, expectations for Anthropic and OpenAI suggest a float of around 5-10%. Despite the relatively small float, passive index funds like those tracking the Russell and Nasdaq 100 indexes are expected to buy a significant portion of available shares, potentially up to 25% within the first six months. This substantial demand from passive investors will play a crucial role in the IPOs’ market dynamics.

The inclusion of SpaceX in major indexes has sparked controversy, primarily due to the fast-tracking process that allows these companies to be added quickly despite their private status. Anthropic’s upcoming IPO is likely to face similar scrutiny as index providers decide how to handle these large tech entrants. The S&P 500’s decision on whether to fast-track Anthropic and similar companies is highly anticipated, with a key date set for June 8th. This decision will influence how quickly these companies are integrated into major index funds and the subsequent demand for their shares.

Overall, the anticipated IPOs of Anthropic, SpaceX, and OpenAI represent a significant shift in the tech and investment landscape. Their massive valuations and the involvement of passive index funds highlight evolving market dynamics where private tech giants transition to public markets under unique conditions. The outcomes of these IPOs and index inclusion decisions will be closely watched by investors, regulators, and market participants, shaping the future of tech investing and public market composition.