Short Answer

Both the model and the market overwhelmingly agree that no IPO by December 31, 2026 is most likely, with only minor residual uncertainty.

1. Market Behavior & Drivers

This contract has been illiquid, with zero volume traded throughout its history. The price has remained range-bound between 1.1% and 1.7%, indicating an extremely low perceived probability that OpenAI's closing market capitalization on its IPO day will be less than $500 billion. The sideways price action reflects a static market with no active participation or price discovery. There have been no significant price movements to analyze, as the minor fluctuations are not supported by any trading activity.
The lack of volume is the defining characteristic of this market. While news of OpenAI's confidential S-1 submission on June 8, 2026, confirmed tangible progress toward an IPO, this development failed to attract any trading interest. This suggests that the market's baseline assumption of a valuation well above $500 billion is so strong that there is no contested view to trade against. The price levels reflect a consensus view, but the zero-volume data shows an absolute lack of conviction or capital committed to that view.
Given the absence of trading, traditional technical levels of support and resistance are not meaningful. The chart's primary insight is into the market's prior belief. The pricing implies near-certainty that OpenAI will command a valuation far exceeding the $500 billion threshold. However, this sentiment remains untested. The market is effectively dormant, pricing an outcome as a foregone conclusion without any capital being put to work.
  • OpenAI likely delays IPO past 2026 due to CEO Altman's $1 trillion valuation target.
  • A $933 billion private valuation positions OpenAI between $750 billion and $1 trillion.

Who Wins and Why

Outcome Market Model Why
No IPO by December 31, 2026 84.0% 87.2% OpenAI may delay its IPO until 2027, seeking a $1 trillion valuation amidst market volatility.

Current Context

OpenAI has formally initiated IPO preparations but lacks a public timeline. The company submitted a confidential S-1 draft to the SEC on June 8, 2026, indicating its intent to pursue a public listing [1][2][3]. Multiple SEC filings from May and June 2026 also reference these preparations [4][5][6][7]. Despite these steps, OpenAI has not yet set a public timeline for its IPO and has not held pre-IPO investor meetings [1][8]. Reports suggest the company is leaning towards postponing its IPO until 2027 [9]. Additionally, existing agreements, such as an equity commitment letter with Amazon, explicitly include a potential future public listing transaction as a condition for certain financial obligations [10]. OpenAI reorganized into a public benefit corporation, OpenAI Group PBC, on October 28, 2025, with the OpenAI Foundation holding a 26% equity stake [11].
OpenAI holds a substantial private market valuation ahead of its listing. As of July 2026, OpenAI's valuation in the private secondary market was approximately $933 billion [12]. This figure provides a baseline for market expectations as the company progresses towards a potential IPO.
Sources (12)
  1. 1Confidential submission of draft S-1 to the SEC | OpenAIopenai.com
  2. 2OpenAI files confidential SEC paperwork for Wall Street debut | AP Newsapnews.com
  3. 3OpenAI plans stock market debut, setting up new race with Anthropicbbc.com
  4. 4https://www.sec.gov/Archives/edgar/data/1892492/000149315226028226/ex99-1.htmsec.gov
  5. 5Press Release, dated May 21, 2026sec.gov
  6. 6Letter from the Investment Company Institutesec.gov
  7. 7Press Release, dated June 4, 2026sec.gov
  8. 8Sources: OpenAI hasn't held pre-IPO meetings or set timeline yetcnbc.com
  9. 9OpenAI Leans Toward Holding Up I.P.O. Until Next Yearnytimes.com
  10. 10Form 8-Ksec.gov
  11. 11Our structure | OpenAIopenai.com
  12. 12OpenAI Has Seen a 'Resurgence' of Interest in Secondary Markets. - Business Insiderbusinessinsider.com

2. Price Chart

Historical Price (Probability)

Outcome probability
Date

3. Market Data

Contract Snapshot

This market resolves YES if OpenAI conducts an IPO by December 31, 2026, 11:59 PM ET, with its first-day closing market capitalization falling within one of the specified ranges. A NO resolution occurs if no IPO takes place by this deadline. Market capitalization is calculated as shares outstanding multiplied by the closing share price, resolving to the higher bracket if the value falls exactly between two ranges. Resolution relies on the primary exchange’s official listing page, with special provisions for trading interruptions.

Available Contracts

Market options and current pricing

Outcome bucket Yes (price) No (price) Last trade probability
No IPO by December 31, 2026 $0.85 $0.16 84%

Market Discussion

Traders are primarily debating whether OpenAI will complete an IPO by the end of 2026, and if so, its closing market capitalization. The strong consensus, at 85%, leans towards no IPO occurring by December 31, 2026, driven by CEO Sam Altman's reported demand for a valuation above $1 trillion, ongoing company restructuring, and a general lack of near-term listing momentum despite a confidential S-1 filing. While significant revenue growth and investor interest suggest a future public listing, current valuation expectations and logistical hurdles are widely believed to push any debut into 2027.

4. Trust Index

Octagon Trust Index Polymarket 60 Caution

Corporate action: boards, bankers, and counsel hold the answer before the announcement

Integrity risk· Information exposure

How it adds up
Integrity80% of score58Caution
Trade quality20% of score66Caution

Includes the cost to trade: a $100 order can't be filled here because the order book is too thin.

Trust score60Caution

Weighted blend with hard caps — a critically weak safety pillar, or a severe trading anomaly, caps the total regardless of the rest. Full methodology · About the Trust Index

Trust profile
Integrity5 screens run · 2 don't apply · 3 awaiting data
Market integrity
74Good

Outcome is hard to influence

Outcome controlStructural risk · high confidence

Settlement is decided by a token-holder vote.

Screened clean
Large tradesNo single trade dominates the tape. Clear
Thin-volume movesMoves carried volume Clear
Size patternsTrade sizes look organic. Clear
1 screen not run
Thin-leg conviction · doesn't apply to this market type
Info fairness
40High Risk
Information exposureStructural risk · medium confidence

Corporate action: boards, bankers, and counsel hold the answer before the announcement

4 screens not run
Move vs. catalyst · data source not connected
Longshot repricing · data source not connected
Pre-broadcast certainty · doesn't apply to this market type
Cross-venue timing · data source not connected
Resolution quality
60Caution

Settlement depends on token voting

No suspicious activity on any screen

Resolution rules read: Clear

Settlement is decided by a token-holder vote.

Liquidity
82Deep

Size fills near the screen price

7 contracts · worst first

500–750B4
Very thin · low confidence

Light recent trading — size may not fill near the screen price.

<500B11
Very thin · low confidence

Light recent trading — size may not fill near the screen price.

750B–1T13
Very thin · low confidence

Light recent trading — size may not fill near the screen price.

1T–1.25T24
Very thin · low confidence

Light recent trading — size may not fill near the screen price.

1.5T+33
Very thin · low confidence

Light recent trading — size may not fill near the screen price.

1.25T–1.5T37
Very thin · low confidence

Light recent trading — size may not fill near the screen price.

No IPO by December 31, 202685
Deep · low confidence

Light recent trading — size may not fill near the screen price.

Move quality
70Stable

No significant moves

7 contracts · worst first

No IPO by December 31, 2026—
No significant move (6h)

Price was stable over the last 6 hours.

750B–1T—
No significant move (7d)

Price was stable over the last 7 days.

1.5T+—
No significant move (3d)

Price was stable over the last 3 days.

<500B—
No significant move (3d)

Price was stable over the last 3 days.

1.25T–1.5T—
No significant move (7d)

Price was stable over the last 7 days.

1T–1.25T—
No significant move (3d)

Price was stable over the last 3 days.

500–750B—
No significant move (3d)

Price was stable over the last 3 days.

Rule clarity
100Clear

Counts toward Resolution quality, not here

7 contracts · worst first

No IPO by December 31, 2026100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
750B–1T100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
1.5T+100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
<500B100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
1.25T–1.5T100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
1T–1.25T100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
500–750B100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Trade quality
66Caution

Order book is thin

Tradable, but expect execution cost beyond small sizes.

Outcome quality 84 (notional-weighted across 7 scored legs)

$100 order: book too thin to fill

$1,000 order: book too thin to fill

$10,000 order: book too thin to fill

No IPO by December 31, 202685Market scoreLiquidity85Move quality–Rule clarity100
Why 85
Liquidity
85 · Deep · low confidence

Light recent trading — size may not fill near the screen price.

Move quality
No significant move (6h)

Price was stable over the last 6 hours.

Rule clarity
100 · Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
750B–1T13Market scoreLiquidity13Move quality–Rule clarity100
Why 13
Liquidity
13 · Very thin · low confidence

Light recent trading — size may not fill near the screen price.

Move quality
No significant move (7d)

Price was stable over the last 7 days.

Rule clarity
100 · Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
1.5T+33Market scoreLiquidity33Move quality–Rule clarity100
Why 33
Liquidity
33 · Very thin · low confidence

Light recent trading — size may not fill near the screen price.

Move quality
No significant move (3d)

Price was stable over the last 3 days.

Rule clarity
100 · Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
<500B11Market scoreLiquidity11Move quality–Rule clarity100
Why 11
Liquidity
11 · Very thin · low confidence

Light recent trading — size may not fill near the screen price.

Move quality
No significant move (3d)

Price was stable over the last 3 days.

Rule clarity
100 · Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
1.25T–1.5T37Market scoreLiquidity37Move quality–Rule clarity100
Why 37
Liquidity
37 · Very thin · low confidence

Light recent trading — size may not fill near the screen price.

Move quality
No significant move (7d)

Price was stable over the last 7 days.

Rule clarity
100 · Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
1T–1.25T24Market scoreLiquidity24Move quality–Rule clarity100
Why 24
Liquidity
24 · Very thin · low confidence

Light recent trading — size may not fill near the screen price.

Move quality
No significant move (3d)

Price was stable over the last 3 days.

Rule clarity
100 · Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
500–750B4Market scoreLiquidity4Move quality–Rule clarity100
Why 4
Liquidity
4 · Very thin · low confidence

Light recent trading — size may not fill near the screen price.

Move quality
No significant move (3d)

Price was stable over the last 3 days.

Rule clarity
100 · Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear

underwriting_v1.4 · computed Sep 20, 2026

5. What Catalysts Could Accelerate an OpenAI IPO Before the 2026 Deadline?

Target IPO Year2027 [1][2][3][4]
Valuation Goal$1 trillion [1][2][3][4]
Prediction Market Confidence (by end of 2026)20-30% [5][6][7][8]
OpenAI currently favors delaying its public offering until 2027. This decision is primarily driven by CEO Sam Altman's objective of achieving a $1 trillion valuation for the company and concerns regarding potential market volatility, particularly in the aftermath of the SpaceX initial public offering [1][2][3][4].
However, several catalysts could accelerate an IPO before 2026. These include the successful introduction of new products, such as GPT-5, and stronger-than-expected revenue growth. Additionally, pressure from major investors, like SoftBank, which holds a $40 billion bridge loan due in March 2027, could prompt an earlier IPO [9]. Conversely, significant challenges could impede a 2026 IPO, including ongoing state attorney general probes, active antitrust scrutiny concerning the Microsoft partnership, and the inherently high capital expenditure required for AI infrastructure development [9].
Prediction markets show low confidence in a 2026 IPO. As of August 2026, prediction markets indicate a confidence level of approximately 20-30% for OpenAI going public by the end of 2026 [5][6][7][8].
Sources (9)
  1. 1OpenAI Leans Toward Holding Up I.P.O. Until Next Yearnytimes.com
  2. 2OpenAI Is Now Considering a 2027 IPO With a $1 Trillion Valuation. Should Investors Expect the Same Volatility as the SpaceX IPO? | The Motley Foolfool.com
  3. 3How SpaceX Split the AI IPO Timeline for OpenAI and Anthropic — NonPublicnonpublic.com
  4. 4Sam Altman Is Waiting for a $1 Trillion OpenAI Valuation. SoftBank Has a $40 Billion Loan Due March 2027. | The Motley Foolfool.com
  5. 5Will Sam Altman-Led OpenAI Go Public This Year? - Benzingabenzinga.com
  6. 6When will OpenAI officially announce an IPO?kalshi.com
  7. 7OpenAI IPO Closing Market Cap Trading Odds & Predictions 2026 | Polymarketpolymarket.com
  8. 8Will OpenAI IPO by December 31 2026?tomorrowodds.com
  9. 9OpenAI IPO 2026: S-1, $800B Valuation & Governanceuseluminix.com

6. What Is the Primary Evidence Supporting a Potential Delay of the OpenAI IPO into 2027?

Polymarket 2026 IPO Probability17.5% (by December 31, 2026) [1]
Previous 2026 IPO Probability75% (last month) [2]
Targeted Valuation$1 trillion [3][4][5]
OpenAI seeks a $1 trillion valuation, delaying its IPO due to market conditions. The primary evidence supporting a potential delay of OpenAI's IPO until 2027 stems from the company's reported ambition to achieve a $1 trillion valuation, with advisers cautioning against current market volatility [3][4][5]. CEO Sam Altman is reportedly driving this valuation push, while advisers suggest that present market conditions may not support such a high figure, thus creating pressure to wait until 2027 to better position the company [4][5]. Advisers have also cited the post-IPO performance of SpaceX as an example of market volatility when advising on the timing [3].
Market skepticism and California initiatives further support a delayed IPO. Market sentiment indicates skepticism regarding a 2026 IPO, with Polymarket assigning only a 17.5% probability to its completion by December 31, 2026 [1]. This reflects a significant drop from the 75% probability observed just last month for a 2026 OpenAI IPO [2]. Separately, the potential passage of the California Oversight of Nonprofit Scientific and Technological Research Organizations Initiative in November 2026 could authorize a board to reverse an organization's conversion from a nonprofit to a for-profit entity, directly impacting OpenAI's October 2025 restructuring into a public benefit corporation [6][7][8]. OpenAI is actively engaged with other proposed initiatives in California's 2026 ballot landscape that specifically target organizations which have converted to for-profit status [6][9][7].
SoftBank's loan repayment offers a contrasting IPO urgency. While SoftBank faces a $40 billion bridge loan repayment due in March 2027, which could create urgency for a public exit, this financial pressure stands in contrast to the internal desire to delay the IPO for valuation reasons [4].
Sources (9)
  1. 1OpenAI IPO date Odds & Prediction Market Analysiscryptoslate.com
  2. 2Chip Stocks Crash, $20B Fund Margin Called, Frontier Labs: SLOW DOWN AI, Mamdani's Grocery Storesyoutube.com
  3. 3OpenAI Is Now Considering a 2027 IPO With a $1 Trillion Valuation. Should Investors Expect the Same Volatility as the SpaceX IPO? | The Motley Foolfool.com
  4. 4Sam Altman Is Waiting for a $1 Trillion OpenAI Valuation. SoftBank Has a $40 Billion Loan Due March 2027. | The Motley Foolfool.com
  5. 5OpenAI Leans Toward Holding Up I.P.O. Until Next Yearnytimes.com
  6. 6Five ballot initiatives filed in California to regulate artificial intelligence and its developers - Ballotpedia Newsnews.ballotpedia.org
  7. 7OpenAI and Common Sense Media announce joint California ballot initiative to regulate use of AI chatbots by minors - Ballotpedia Newsnews.ballotpedia.org
  8. 8California Oversight of Nonprofit Scientific and Technological Research Organizations Initiative (2026) - Ballotpediaballotpedia.org
  9. 9OpenAI and Common Sense Media announce joint California ballot initiative to regulate minors' use of AI chatbots - Ballotpedia Newsnews.ballotpedia.org

7. How Does OpenAI's Path to IPO Compare to Recent Major Tech Listings like ARM and Snowflake?

Sought IPO Valuation$1 trillion [1][2]
Recent Private Valuation$852 billion in mid-2026 [1][2]
Probability of no IPO by Dec 202665-80% [3][4][5][6]
OpenAI weighs a 2027 IPO targeting a $1 trillion valuation. Although the company has confidentially filed for an IPO, it is reportedly considering delaying its public listing until 2027 [1][7][8][2]. This potential delay is attributed to current volatile market conditions and concerns regarding investor sentiment, as OpenAI aims to avoid the significant market fluctuations observed in other major tech debuts [1][2]. Sam Altman, OpenAI's CEO, is reportedly targeting a $1 trillion valuation for the IPO, a figure considerably higher than its most recent private market valuation of $852 billion post-money as of mid-2026 [1][2].
Prediction markets doubt a 2026 IPO given market conditions. As of mid-2026, prediction markets strongly suggest that OpenAI will not complete an IPO by December 31, 2026, with probability estimates frequently exceeding 65-80% [3][4][5][6]. This cautious strategy by OpenAI stands in contrast to the market behavior of other high-profile tech listings like Snowflake in 2020 and ARM in 2023. These companies experienced extreme volatility and significant premiums during their initial public debuts; for instance, Snowflake's stock soared over 130% on its first day of trading [9][10][11].
Sources (11)
  1. 1OpenAI Leans Toward Holding Up I.P.O. Until Next Yearnytimes.com
  2. 2OpenAI Is Now Considering a 2027 IPO With a $1 Trillion Valuation. Should Investors Expect the Same Volatility as the SpaceX IPO? | The Motley Foolfool.com
  3. 3Will Sam Altman-Led OpenAI Go Public This Year? - Benzingabenzinga.com
  4. 4OpenAI IPO Closing Market Cap Trading Odds & Predictions 2026 | Polymarketpolymarket.com
  5. 5OpenAI IPO Closing Market Cap Trading Odds & Predictions 2026 | Polymarketpolymarket.copilot.markets
  6. 6OpenAI IPO Closing Market Cap — 7 Markets, Analytics & Predictions | Accrue | Accrueaccrue.com
  7. 7OpenAI confidentially files for IPO, prepping Wall Street...cnbc.com
  8. 8OpenAI IPO: Everything You Need to Know | Investing.cominvesting.com
  9. 9For retail investors, jumping on Arm's blockbuster IPO is a...reuters.com
  10. 10Snowflake IPO: How the stock is trading on its debutfinance.yahoo.com
  11. 11After its blockbuster IPO, what's next for Snowflake? - SiliconANGLEsiliconangle.com

8. How Will OpenAI's Public S-1 Filing Clarify Its Financial Health and Initial Valuation?

Confidential Draft S-1 SubmissionJune 8, 2026 [1][2][3]
Last Reported Private Valuation$852 billion (March 2026) [4][2]
Aspirational IPO Valuation$1 trillion [5]
OpenAI's S-1 filing remains confidential, obscuring financial details. OpenAI confidentially submitted a draft S-1 registration statement to the SEC on June 8, 2026 [1][2][3]. However, as of August 6, 2026, a public S-1 prospectus has not been released, and the company has not confirmed an initial public offering (IPO) date [6][4][7][5]. Consequently, current publicly available information does not clarify how a public S-1 filing would illuminate OpenAI's financial health and initial valuation.
OpenAI's IPO timing and valuation face market speculation. OpenAI’s last reported private valuation was approximately $852 billion, following a funding round in March 2026 [4][2]. While the company's leadership has reportedly discussed aspirations for a $1 trillion valuation upon going public, there are also suggestions that the IPO might be delayed until 2027 [5]. Prediction markets largely anticipate that an IPO will not occur by December 31, 2026 [8][9].
Sources (9)
  1. 1Confidential submission of draft S-1 to the SECopenai.com
  2. 2OpenAI confidentially files for IPO, prepping Wall Street...cnbc.com
  3. 3OpenAI Just Filed for an IPO. Now What? | The Motley Foolfool.com
  4. 4OpenAI Stock & IPO 2026: Valuation, How to Invest, IPO Datestartuphub.ai
  5. 5OpenAI Leans Toward Holding Up I.P.O. Until Next Yearnytimes.com
  6. 6OpenAI IPO: Everything You Need to Know | Investing.cominvesting.com
  7. 7OpenAI IPO: S-1 Status, Valuation, Timeline, and Risks | TECHitechi.com
  8. 8OpenAI IPO Closing Market Cap Trading Odds & Predictions 2026 | Polymarketpolymarket.com
  9. 9OpenAI IPO Closing Market Cap — Odds & Charts | Prescientprescient.markets

9. What Role Could Microsoft's Strategic Partnership Play in the Timing and Structure of an OpenAI IPO?

Microsoft Equity Stake~27% in OpenAI Group PBC [1][2][3]
Microsoft IP Licensing AccessThrough 2032 [1][2][3]
No IPO by Dec 31, 2026 ProbabilityApproximately 80% (as of July/August 2026) [4][5][6]
Microsoft and OpenAI restructured their partnership to enhance independence for an IPO. In April 2026, the strategic partnership between Microsoft and OpenAI was modified to a non-exclusive model, allowing OpenAI to engage with other cloud providers while maintaining Microsoft as a primary partner [1][7][8][9]. This strategic adjustment was designed to alleviate antitrust concerns, increase OpenAI's operational autonomy, and prepare the company for a potential IPO by reducing reliance-based risks [1][7][8][9].
The partnership's structure involves equity, IP rights, and persistent financial obligations. Microsoft holds an approximate 27% equity stake in OpenAI Group PBC and retains IP licensing access that extends through 2032 [1][2][3]. Revenue-sharing payments from OpenAI to Microsoft are capped and are scheduled to conclude by 2030, meaning these contractual commitments will continue even after an IPO [1][2][3]. OpenAI has listed its relationship with Microsoft as a significant risk factor in documentation provided to potential investors, citing the possibility of adverse impacts if the partnership is altered or terminated, a necessary element for its IPO S-1 filing preparations [1][10][8].
Despite preparations, markets express skepticism regarding a near-term OpenAI IPO. As of July/August 2026, prediction markets assign a high probability, approximately 80%, to "No IPO by December 31, 2026" [4][5][6]. This market sentiment indicates skepticism about the likelihood of a public listing in the near future [4][5][6].
Sources (10)
  1. 1OpenAI IPO: Everything You Need to Know | Investing.cominvesting.com
  2. 2Why OpenAI’s IPO Plans Could Be a Massive Win for Microsoft | Investing.cominvesting.com
  3. 3OpenAI IPO valuation and expected share price: OpenAI IPO: Date, share price, valuation, timing and all details investors need to know - The Economic Timeseconomictimes.indiatimes.com
  4. 4OpenAI IPO Closing Market Cap Trading Odds & Predictions 2026 | Polymarketpolymarket.com
  5. 5What Betting Markets Really Think About the OpenAI, Anthropic, and Databricks IPOs - 24/7 Wall St.247wallst.com
  6. 6OpenAI IPO Closing Market Cap: Will It Land Between $750B and $1T?lines.com
  7. 7Ahead of IPO Push, OpenAI Distances Itself from Microsoft...morningstar.com
  8. 8The prospectus. Where the AI labs' singular governance history meets the auditor. - Thorsten Meyer AIthorstenmeyerai.com
  9. 9Microsoft, OpenAI change terms of deal so startup can court Amazon and others By Reutersau.investing.com
  10. 10OpenAI warns Microsoft ties pose risk ahead of potential IPO: Report - The Economic Timeseconomictimes.indiatimes.com

10. What Could Change the Odds

Key Catalysts

OpenAI, a private company as of August 6, 2026, confidentially submitted a draft S-1 to the SEC on June 8, 2026 [1][2]. The company reportedly leans toward delaying its initial public offering until 2027, citing concerns over market conditions, valuation targets, and the lukewarm reception of the SpaceX IPO [3][4][5][6]. CEO Sam Altman is reportedly holding out for a $1 trillion valuation [3]. Market speculation has indicated a potential valuation of up to $1.75 trillion and proceeds reaching $75 billion [7]. As of October 2025, OpenAI had recapitalized as a public benefit corporation (PBC), with Microsoft holding an approximately 27 percent stake valued at roughly $135 billion [8]. Amazon entered into an agreement in February 2026 to purchase $35 billion in OpenAI Series C Preferred Stock, with a clause requiring the purchase of all remaining commitment shares upon the consummation of an OpenAI public listing transaction [9].
Prediction markets indicate shifting probabilities for OpenAI's public debut. As of late June 2026, Kalshi estimated a 59% probability that an OpenAI IPO would be officially announced by March 1, 2027, increasing to 73% by June 2027 [10]. Concurrently, rival company Anthropic also confidentially filed for an IPO in June 2026 and is expected to go public ahead of OpenAI, potentially as early as October 2026 [11][12].

Key Dates & Catalysts

  • Closes: January 01, 2027
Sources (12)
  1. 1Confidential submission of draft S-1 to the SEC | OpenAIopenai.com
  2. 2OpenAI files confidential SEC paperwork for Wall Street debut | AP Newsapnews.com
  3. 3OpenAI Leans Toward Holding Up I.P.O. Until Next Yearnytimes.com
  4. 4Sources: OpenAI hasn't held pre-IPO meetings or set timeline yetcnbc.com
  5. 5OpenAI Leans Toward Holding Up I.P.O. Until Next Yearnytimes.com
  6. 6OpenAI leans toward a 2027 float after SpaceX's debut went cold. Did Sam Altman blink first?proactiveinvestors.co.uk
  7. 7Letter from the Investment Company Institutesec.gov
  8. 8EX-99.2sec.gov
  9. 9Tm267374d1 8k.htmsec.gov
  10. 10OpenAI IPO timeline delayed, Kalshi predictionscnbc.com
  11. 11What a Delayed OpenAI IPO Would Tell Investors | Morningstarmorningstar.com
  12. 12OpenAI Weighs IPO in 2027 After Expected Anthropic Public Debutnews.bloomberglaw.com