IPOについて知っておくべきこと

The global initial public offering (IPO) market saw a resurgence in 2025. Proceeds increased 39% to US$171.8 billion across 1,293 listings, the sharpest annual rebound since the post-pandemic boom. 

That momentum is now building into 2026 for what some financial analysts speculate could be the biggest IPO year in history.

A handful of mega-cap private companies, including SpaceX, OpenAI, and Anthropic, are exploring going public this year, with combined valuations that could exceed US$3 trillion.

2025 IPO market data

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Top IPO candidates in 2026

1. SpaceX - US$1.5T valuation

SpaceX revenue reportedly hit US$15 billion in 2025, with analysts projecting an increase to US$22-24 billion in 2026. The company has been cash-flow positive for years, driven largely by its Starlink satellite broadband network.

Following its February 2026 all-stock acquisition of Elon Musk's AI company xAI, the combined entity also encompasses Grok AI and the social media platform X (Twitter).

Leading financial analysts have reported SpaceX is targeting a mid-2026 listing. Its next funding round is estimated to raise around US$50 billion, putting its initial market cap at US$1.5 trillion, which would make it the second-highest IPO valuation of all time. 

This valuation would mean SpaceX would trade at 62–68 times projected 2026 sales. A steep premium that requires massive growth assumptions around Starlink and longer-term space-based AI ambitions.

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2. OpenAI - US$850B valuation

OpenAI, the company behind ChatGPT, now reports more than 800 million weekly active users of its groundbreaking AI product. 

Originally a nonprofit research lab, it has restructured into a for-profit entity developing large language models for consumer, enterprise, and developer applications.

OpenAI is reportedly targeting a Q4 2026 IPO, finalising a US$100 billion-plus funding round (its largest ever), which would put its valuation at US$850 billion. 

However, OpenAI still needs to overcome some near-term hurdles to achieve the potential associated with such a high valuation. 

It projects US$14 billion in losses in 2026 and does not expect profitability before 2029. It is facing intensified competition from Google Gemini and other AI startups cutting into its market share, and Elon Musk has filed a lawsuit against the company seeking up to US$134 billion in damages. 

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3. Anthropic - US$350B valuation

While OpenAI has leaned into consumer products, Anthropic has built its business around enterprise adoption. Roughly 80% of its revenue comes from business customers, and eight of the Fortune 10 are now Claude users.

Anthropic closed a US$30 billion funding round in February 2026 at a US$350 billion valuation, more than double its US$183 billion valuation from five months earlier. 

Anthropic’s annualised revenue has been growing at 10x per year since 2024, well outpacing OpenAI’s growth of 3.4x per year. If this trend continues, Anthropic revenue could pass OpenAI by mid-2026. However, since July 2025, Anthropic’s growth rate has slowed down to 7x per year.

Anthropic has engaged law firm Wilson Sonsini to begin IPO preparations, and the recent appointment of former Microsoft CFO Chris Liddell to its board signals a governance push ahead of a potential late-2026 listing.

The company is not yet profitable, but its enterprise-heavy revenue mix and rapid growth trajectory make it one of the most closely watched IPO candidates this year.

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4. Stripe - US$140B valuation

Stripe processed US$1.4 trillion in total payment volume in 2024, roughly 1.3% of global GDP. Half the Fortune 100 now use Stripe, and recent moves into stablecoins and AI-to-AI "agentic commerce" payments are expanding its addressable market.

Stripe remains one of the most anticipated fintech IPOs globally, but the company has shown a lack of urgency to list in the past. Co-founder John Collison said at Davos in January 2026 that Stripe was "still not in any rush." 

Rather than pursuing an IPO, Stripe has conducted tender offers every six months at rising valuations, providing employee liquidity without surrendering control. 

These frequent tenders effectively function as a private-market alternative to going public. However, a traditional IPO is still on the cards in 2026, with the company's February tender offer valuing it at US$140 billion or more, and profitability since 2024 removing one of the key barriers to listing.

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5. Databricks - US$134B valuation

Databricks completed a US$5 billion funding round in February 2026 at a US$134 billion valuation. 

The company's annualised revenue exceeded US$5.4 billion in January 2026, growing a massive 65% year-on-year, with AI products generating US$1.4 billion. 

CEO Ali Ghodsi has said the company is prepared to go public "when the time is right," with most analysts expecting a H2 2026 listing. At US$134 billion, Databricks is valued at more than twice publicly traded rival Snowflake (~US$58 billion).

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Bottom line

2026 has the potential to be the biggest IPO year by valuation in history. With the most likely candidates, SpaceX and Databricks, matching the total valuation of all 2025 IPOs on their own.

If major AI players like OpenAI and Anthropic, as well as world-leading payment fintech Stripe, also list before the end of the year, 2026 could see over US$3 trillion in total value added to global markets through IPOs alone.