Anthropic has taken a major step towards becoming a publicly traded company after unveiling its Form S-1 registration statement on Monday, bringing its long-anticipated initial public offering closer to reality while disclosing that its legal battle with the Trump administration and the US Department of Defense could threaten revenue and disrupt operations.
The artificial intelligence company, which develops the Claude family of models, has proposed listing on the Nasdaq Stock Market under the ticker symbol “ANT.” Its filing marks a significant milestone in the process of entering public markets, although the timing and final terms of the offering remain subject to regulatory review and other requirements.
Traders on prediction market platform Kalshi assign a 95% probability to Anthropic officially announcing an IPO by the end of 2026. Kalshi defines such an announcement as the Securities and Exchange Commission declaring the S-1 effective, the company pricing its offering, or an exchange assigning a ticker to its shares.
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The company is reportedly aiming to begin trading during the week of November 16, according to The Wall Street Journal. Kalshi traders put the probability of trading beginning before that week at just 14%, while traders on Polymarket assign a 69% chance that Anthropic will list on a public exchange and begin trading by November 20.
These probabilities reflect traders’ expectations rather than confirmed milestones. Filing an S-1 does not, by itself, establish that an IPO will occur on a particular date. The offering must progress through the relevant regulatory and commercial steps before shares can begin trading.
Anthropic’s filing places its dispute with the US government among the risks prospective shareholders will need to assess. The company warned that continuing tensions with the Trump administration and the Department of Defense could result in “material revenue losses or business disruptions.”
The dispute centers on the Pentagon’s designation of Anthropic as a “supply chain risk to national security.” In February, President Donald Trump also ordered the US government to stop using the company’s models, according to the account in the filing.
The conflict has created uncertainty around Anthropic’s access to government business and the broader implications of its relationship with federal agencies. For prospective investors, the issue extends beyond a single contract or customer: government restrictions could affect revenue, commercial relationships and the company’s ability to compete for certain public-sector opportunities.
In March, Anthropic filed a complaint in the US District Court for the Northern District of California challenging the supply-chain designation as illegal. It also filed a petition for review with the US Court of Appeals for the District of Columbia Circuit.
The California federal court ruled in Anthropic’s favor, finding that the Pentagon’s actions were “retaliatory acts meant to punish” the company. The court also found that the actions violated Anthropic’s First Amendment rights and its Fifth Amendment right to due process, according to the company’s IPO filing.
The D.C. Circuit Court of Appeals, however, ruled in favor of the Department of Defense, concluding that the designation was permitted under the Federal Acquisition Supply Chain Security Act.
The conflicting outcomes leave Anthropic facing continued legal uncertainty as it prepares to approach public-market investors. The company said in its filing that it was “evaluating its next steps” following the D.C. Circuit decision and has asked the full appeals court to rehear the case.
On Monday, the US government also filed a notice of appeal seeking to invalidate the Northern California district court’s ruling in Anthropic’s favor. That move adds another layer to the legal dispute, increasing the possibility that the company’s government relationships and access to public-sector business will remain contested during the IPO process.
The case presents investors with a difficult distinction between legal risk and commercial performance. Anthropic may continue expanding its private-sector business even if restrictions affect government relationships.
Anthropic’s S-1 filing also marks a transition from private-market fundraising towards the disclosure requirements and scrutiny associated with being a public company. Investors will be able to assess the company’s business, financial position, risks and growth plans through its registration documents, rather than relying primarily on private funding announcements and management statements.
The IPO would arrive at a time when the AI industry faces growing questions about the cost of developing and operating advanced models, the sustainability of revenue growth and the capital required to secure computing infrastructure. Public investors will have to evaluate whether Anthropic can turn demand for Claude into durable earnings while managing substantial technology and infrastructure commitments.
But the government dispute adds a separate variable to that assessment. Even a company with strong commercial demand can face financial uncertainty if regulatory or legal decisions restrict access to important customers or markets. Conversely, a favorable resolution could reduce one source of uncertainty, although it would not eliminate the competitive and financial risks inherent in the AI industry.
The proposed “ANT” ticker and the reported target of trading in the week of November 16 suggest that preparations are advancing. Yet the legal proceedings underscore why the distinction between an S-1 filing and a completed IPO matters. The company still faces regulatory requirements, offering decisions, and the possibility that developments outside its control could affect the timetable.
However, Anthropic’s public-market debut is expected to offer investors a new opportunity to evaluate one of the leading AI developers through public disclosures. But the filing also makes clear that the investment case will involve more than expectations for AI adoption.