Anthropic’s monster IPO is forcing rivals to rethink their own listing plans

Anthropic is shaping up to be exactly that.

The AI firm behind the Claude model series filed its draft S-1 with the SEC on June 1, 2026, setting the stage for what could be the largest technology debut in US market history. The company is targeting a Nasdaq listing with a valuation that analysts are placing somewhere between $1.5 trillion and $2 trillion.

The size of the thing

Anthropic closed a $65 billion funding round in May 2026, which valued the company at $965 billion before a single share hits the public market. The anticipated offering is expected to raise at least $86 billion, putting it in the same conversation as SpaceX’s $86.2 billion debut.

Goldman Sachs, JPMorgan, and Morgan Stanley are leading the underwriting.

The public prospectus is set to drop after Labor Day, with the holiday falling on September 7, 2026. A first trade is being targeted for late September or early October. The Federal Reserve has a mid-September meeting scheduled, and mid-term elections add another layer of market noise later in the year.

The deal structure may include longer lockup periods than the standard 180-day window. Existing shareholders are also expected to have the opportunity to sell shares as part of the offering.

Who gets squeezed out

OpenAI has shifted its own IPO timeline toward 2027, effectively stepping aside from a 2026 window that was already feeling crowded before Anthropic’s filing.

What the ripple effects look like

The banks managing the deal are already navigating one of the more complex placement challenges the market has seen in years. Sovereign wealth funds and long-duration institutional allocators are the natural buyers, and they are exactly the audience that every other 2026 IPO candidate was hoping to court.

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