What happened
Anthropic has closed a $65 billion Series H funding round, achieving a $965 billion post-money valuation and potentially marking its final private financing before a public offering [6]. The deal vaults Anthropic’s private market valuation past that of its chief rival, OpenAI, which was last valued at $852 billion in March 2026 [1], [6].
The round was co-led by a broad syndicate of investors including Altimeter Capital, Dragoneer, Greenoaks, and Sequoia Capital, with participation from institutional investors like Baillie Gifford, Blackstone, and Fidelity Management & Research [6]. The $65 billion figure includes $15 billion in previously announced commitments from strategic hyperscale partners, such as a $5 billion tranche from Amazon confirmed in April [6]. The new valuation represents a 154% increase from the company’s $380 billion post-money valuation in its February 2026 Series G round [2], [7].
The financing follows a period of historic revenue acceleration for the AI lab. Anthropic’s annualized revenue run-rate surpassed $47 billion in early May 2026 [6]. This is a dramatic escalation from a run-rate of approximately $9 billion at the end of 2025 and $19 billion in March 2026 [1], [2]. The company reportedly projected $10.9 billion in revenue for the second quarter of 2026 alone and anticipates its first-ever quarterly operating profit [4]. This growth is largely attributed to strong enterprise adoption of its products, with more than 1,000 customers now spending over $1 million annually [4].
How the market reacted
The Kalshi event contract on Anthropic’s IPO date, KXIPOANTHROPIC-DATE-26JUN01, which settles based on whether the company lists by June 1, 2026, saw no price change following the news. The contract’s price held steady at $1.00, representing 100% certainty that an IPO would not occur by the contract’s expiration.
The lack of a price move is a function of the market’s prior positioning. Traders had already concluded that a public listing before June 1 was effectively impossible, pricing the contract at its terminal value. The announcement of a major private funding round in late May served only to confirm this widely-held view. While the news is highly material to the company’s valuation and the timing of a future IPO, it had no impact on the already-settled outcome for this near-term contract.
Why it matters for the IPO
This massive pre-IPO funding round materially reshapes the path to a public listing for Anthropic and its primary competitor, OpenAI.
First, the $965 billion valuation establishes a new, formidable benchmark for Anthropic's eventual IPO price, placing it ahead of OpenAI’s last private valuation [1], [6]. The narrative of a preordained OpenAI market leadership has been replaced by a head-to-head race, with prediction markets already assigning a 96% probability that Anthropic’s valuation will exceed OpenAI’s at some point in 2026 [1].
Second, the round strengthens Anthropic's balance sheet ahead of a potential October 2026 public listing target [1], [3]. Described as potentially the company's last private raise, it provides substantial capital for compute infrastructure and research, reducing immediate post-IPO financing pressure [6]. This timing sets up an unprecedented showdown in public markets, as OpenAI confidentially filed its S-1 on May 22, 2026, and is reportedly targeting a Q4 2026 IPO [1], [4]. The prospect of two AI-focused IPOs with a combined valuation exceeding $1.7 trillion landing in the same quarter will be a significant test of institutional investor appetite [3].
Third, the valuation is anchored in tangible financial metrics rather than speculative potential. Investors are pricing the company based on a roughly 20x multiple of its nearly $50 billion forward revenue run-rate [4], [6]. This contrasts with earlier-stage AI valuations and provides a more concrete foundation for public market investors to evaluate.
What changes the market next
The trajectory of Anthropic's IPO is now dependent on several key developments. The most significant catalyst will be the company’s own S-1 filing, whether confidential or public, which would formalize its intent to go public and provide the first audited look at its financials.
The market will also closely watch the performance of OpenAI’s IPO. As the first of the two frontier AI labs expected to list, its reception, pricing, and post-trading performance will heavily influence the environment and valuation expectations for Anthropic’s subsequent offering. The underwriter overlap, with Goldman Sachs and Morgan Stanley advising both companies, adds a layer of complexity, as the banks will need to manage the allocation of institutional capital across two of the largest tech IPOs in history [1].
Finally, investors will look for confirmation of Anthropic’s reported financial momentum in its upcoming quarterly results. Sustaining its hypergrowth and achieving the projected Q2 operating profit will be critical to justifying its near-trillion-dollar valuation [4]. Any developments in its ongoing dispute with the U.S. Department of Defense, which designated the company a supply chain risk, could also materially affect its future revenue outlook and investor sentiment [5].
