Anthropic's Mega IPO Looms, Triggering Early Scramble for U.S. Listing Windows
nashnova research
Anthropic is preparing to file its IPO publicly, targeting a raise that could match or exceed SpaceX's record $86.2 billion. The sheer scale is squeezing other companies' listing windows and forcing the entire U.S. IPO calendar into an early land-grab.
How big is Anthropic's IPO, and why is everyone else nervous?
Anthropic's expected raise could match or surpass SpaceX's record $86.2 billion, putting it in historic territory.
This means → long-only investors and sovereign wealth funds have a finite attention budget. Once this mega-deal locks in their focus, the capital and mindshare left for everyone else shrinks sharply.
People familiar with the matter say some companies have already found it noticeably harder to secure meetings with large buyers as Anthropic's timeline draws closer.
Why is the listing window tighter than usual?
Barclays' head of Americas equity capital markets, Rob Stowe, flags a triple squeeze: the Fed's mid-September meeting, early-November midterm elections, and hotter-than-expected inflation prints.
In plain terms = the calendar days safe for pricing were already limited — now issuers must also compete with Anthropic for the same pool of investors, compressing the window further.
Stowe expects September through October to be extremely busy: "There'll be a lot of activity, but it'll be concentrated in a few windows."
Does rushing ahead actually work? What does the data say?
Bloomberg data show 14 sizable companies managed to complete their IPOs in the month before SpaceX listed.
Their weighted-average post-listing return: a loss of 9.5%.
This reflects a harsh reality: listing ahead of a mega-IPO does not automatically translate into strong performance — investor attention was already being pulled forward.
AI names dominate the queue — where does that leave everyone else?
AI-linked issuers lead the current roadshow pipeline: cloud-computing firm Nscale has joined the queue; SoftBank's digital-infrastructure arm SB Energy targets a raise exceeding $5 billion; data-center operator Switch filed confidentially this month and could list as early as November, with a reported valuation (including debt) approaching $50 billion.
Morgan Stanley's global ECM co-head Eddie Molloy put it bluntly: "Non-thematic IPOs are harder. Capital around AI infrastructure and aerospace & defense is abundant; if you're a mid-sized issuer outside those mega-themes, capturing buyer attention is tougher."
Bank of America's global head of tech ECM, J.D. Moriarty, added: "The market's tendency to shrug off smaller deals is high — there are simply too many large transactions to choose from."
How has the U.S. IPO class of 2025 performed overall?
Bloomberg data show this year's U.S. IPO cohort has returned a weighted average of just 5.6%, well behind the S&P 500's 13% gain and the Nasdaq 100's 17% rise.
Large deals fared worse: 16 companies that raised over $1 billion posted a weighted-average gain of only 4.2%; six of the ten largest IPOs still trade below their offer price.
This means → the market's absorptive capacity is already strained. Whether other issuers can price and attract sufficient investor interest inside the remaining windows — before Anthropic's mega-deal officially lands — is the real stress test for this IPO cycle.
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