OpenAI IPO Closing Market Cap

$70K Vol.Closes Dec 31, 2027

1.5T+$18.2K Vol.33%

1T–1.25T$9.7K Vol.16%

1.25T–1.5T$5.5K Vol.14%

No IPO by December 31, 2027$17.3K Vol.14%

750B–1T$7.6K Vol.14%

500–750B$7.5K Vol.4%

<500B$4.2K Vol.2%

View on Polymarket

At a glance

What

OpenAI is preparing for an initial public offering potentially targeting a valuation between $852 billion and over $1 trillion, with a rumored launch date in late 2026 or early 2027.

The Guardian zacks.com

Who

The AI developer behind ChatGPT, backed by major investors including Microsoft, SoftBank, and Nvidia, is the company seeking to list on a US stock exchange.

CNBC zacks.com

Context

The filing follows a massive $122 billion capital raise and coincides with rival Anthropic also moving toward public markets, signaling a broader shift in the AI industry.

The Guardian Reuters

Stakes

Achieving a market cap above $1.5 trillion would require the company to significantly exceed its current $852 billion valuation, representing a massive leap in perceived future revenue and AI adoption.

CNBC zacks.com

Note: While some sources cite a specific planned IPO date of November 27, 2026, OpenAI has officially stated it has not yet determined the timing of its offering, and reports indicate a potential shift to 2027.

Mar 31

OpenAI closed a record-breaking $122 billion funding round at a post-money valuation of $852 billion, setting a high baseline for its IPO valuation.

CNBC openai.com

Jun 8

OpenAI confidentially filed an S-1 IPO prospectus with the US SEC, initiating its process to become a publicly traded company.

The Guardian Reuters

Jun 25

Three individuals familiar with company discussions reported that OpenAI is considering postponing its IPO until 2027 rather than launching in late 2026.

New York Times

Now

Nov 27

OpenAI's IPO is planned to occur on this date, which would establish its first-day market capitalization.

tradingview.com

Dec 1

OpenAI must publicly file its final registration statement if it intends to list in Q4 2026, as the confidential filing alone does not guarantee a year-end launch.

zacks.com smartasset.com

AI-generated briefing. AI can make mistakes. This is not financial advice.

Bull case

OpenAI's official announcement confirmed a $122 billion committed capital round at an $852 billion valuation, providing a massive financial foundation to support rapid growth toward a $1.5 trillion+ cap.
CNBC openai.com
Analysts and media reports suggest the IPO could target a valuation exceeding $1 trillion, with some bullish forecasts indicating the company could eventually reach $1.5 trillion if generative AI adoption accelerates globally.
The Guardian zacks.com
The confidential filing of the S-1 prospectus specifically targets a Q4 2026 public listing with a valuation range of $852 billion to $1 trillion, signaling strong internal confidence in the company's market position.
polymarket.com smartasset.com

AI-generated briefing. AI can make mistakes. This is not financial advice.

Bear case

Reuters reported in late June 2026 that OpenAI is now considering delaying its IPO until 2027, which risks missing the market's December 31, 2027 close date if further delays occur.
New York Times smartasset.com
In early 2026, major reports placed OpenAI's valuation between $730 billion and $852 billion, meaning a jump to $1.5 trillion+ would require nearly doubling its value in a single debut, a historically difficult feat.
zacks.com cmcmarkets.com

At a glance

What

OpenAI is preparing for an initial public offering potentially targeting a valuation between $852 billion and over $1 trillion, with a rumored launch date in late 2026 or early 2027.

The Guardian zacks.com

Who

The AI developer behind ChatGPT, backed by major investors including Microsoft, SoftBank, and Nvidia, is the company seeking to list on a US stock exchange.

CNBC zacks.com

Context

The filing follows a massive $122 billion capital raise and coincides with rival Anthropic also moving toward public markets, signaling a broader shift in the AI industry.

The Guardian Reuters

Stakes

CNBC zacks.com

Mar 31

OpenAI closed a record-breaking $122 billion funding round at a post-money valuation of $852 billion, setting a high baseline for its IPO valuation.

CNBC openai.com

Jun 8

OpenAI confidentially filed an S-1 IPO prospectus with the US SEC, initiating its process to become a publicly traded company.

The Guardian Reuters

Jun 25

Three individuals familiar with company discussions reported that OpenAI is considering postponing its IPO until 2027 rather than launching in late 2026.

New York Times

Now

Nov 27

OpenAI's IPO is planned to occur on this date, which would establish its first-day market capitalization.

tradingview.com

Dec 1

OpenAI must publicly file its final registration statement if it intends to list in Q4 2026, as the confidential filing alone does not guarantee a year-end launch.

zacks.com smartasset.com

AI-generated briefing. AI can make mistakes. This is not financial advice.

Bull case

OpenAI's official announcement confirmed a $122 billion committed capital round at an $852 billion valuation, providing a massive financial foundation to support rapid growth toward a $1.5 trillion+ cap.
CNBC openai.com
Analysts and media reports suggest the IPO could target a valuation exceeding $1 trillion, with some bullish forecasts indicating the company could eventually reach $1.5 trillion if generative AI adoption accelerates globally.
The Guardian zacks.com
The confidential filing of the S-1 prospectus specifically targets a Q4 2026 public listing with a valuation range of $852 billion to $1 trillion, signaling strong internal confidence in the company's market position.
polymarket.com smartasset.com

AI-generated briefing. AI can make mistakes. This is not financial advice.

Bear case

Reuters reported in late June 2026 that OpenAI is now considering delaying its IPO until 2027, which risks missing the market's December 31, 2027 close date if further delays occur.
New York Times smartasset.com
In early 2026, major reports placed OpenAI's valuation between $730 billion and $852 billion, meaning a jump to $1.5 trillion+ would require nearly doubling its value in a single debut, a historically difficult feat.
zacks.com cmcmarkets.com

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