What will OpenAI's market capitalization be at the close of its first day of public trading, in billions of USD?

Timing and Base Assumptions This assessment assumes OpenAI successfully executes an IPO, which is highly likely to occur in mid-to-late 2027. CEO Sam Altman has explicitly ruled out a 2026 listing, calling it "ill-advised" due to ongoing safety work OpenAI IPO will not happen in 2026 amid AI safety fears ...https://thenextweb.com/news/anthropic-ipo-nasdaq-october-listingStocks fall after AI leaders warn industry should slow down. However, CFO Sarah Friar has told employees the company will go public in 2027 OpenAI 'will be a public company in 2027' or sooner, CFO .... Because the listing is likely 9 to 15 months away, the range of possible outcomes remains exceptionally wide, heavily dependent on broader market conditions and the company's ability to sustain its compounding growth. The additional revenue scaling possible over that timeline supports a $1.7 trillion median and somewhat greater weight in the upper half of the distribution.

Private Market Anchors and Downside Risks Our $1.7 trillion median is heavily anchored by reports of early talks for a pre-IPO bridge round valuing OpenAI at approximately $1.4 trillion OpenAI targets $30 billion funding round at $1.4 trillion ...https://aiweekly.co/alerts/openai-in-talks-for-30b-at-14t-ipo-delayed-to-2027. Bankers rarely price IPOs below the most recent private watermark. However, if macroeconomic conditions sour, the $1.4 trillion deal falls through, or AI valuations contract broadly, OpenAI might be forced to list closer to its March 2026 post-money valuation of $852 billion. This aligns with our 10th percentile estimate of $950 billion and 25th percentile estimate of $1.3 trillion. Recent market turbulence—including a mid-October tech sell-off driven by concerns over AI debt and interest rates https://www.cnn.com/2026/10/16/investing/tech-stocks-ai-coreweavehttps://www.cnn.com/2026/10/16/investing/tech-stocks-ai-coreweave—and internal safety controversies, such as the temporary withholding of GPT-6.1 Astra OpenAI targets $30 billion funding round at $1.4 trillion ..., highlight these downside risks.

Revenue Growth and Comparables On the upside, OpenAI's fundamentals are expanding rapidly. The company's annualized revenue run rate approached $50 billion at the end of September 2026, exhibiting exceptional quarter-over-quarter growth OpenAI's September annualized revenue nears $50 billion, ...OpenAI corrects annualized revenue figure to $50 billionhttps://www.euronews.com/2026/10/15/anthropic-revenue-jumps-46-to-168bn-as-ai-firm-eyes-record-2-trillion-ipo-valuation. If this trajectory holds, run-rate revenue could clear $100 billion by a late-2027 listing. At a 15–20x multiple, this easily justifies the upper half of our distribution, including a 75th percentile of $2.25 trillion. Furthermore, Anthropic's looming November IPO serves as the closest comparable. Prospective investors recently valued Anthropic between $1.5 trillion and $2 trillion https://sg.finance.yahoo.com/news/anthropic-targets-mega-ipo-thanksgiving-203657705.htmlInvestors temper Anthropic IPO valuation expectations over ...https://finance.yahoo.com/technology/ai/articles/investors-push-anthropic-cut-ipo-213503694.html. A strong public debut for Anthropic would likely cement a premium valuation for OpenAI.

First-Day Dynamics and Upside Potential Mega-IPOs frequently exhibit strong retail-driven first-day pops, which we factor into the upper percentiles. SpaceX’s June 2026 listing serves as a prime template: it priced at roughly $1.8 trillion and surged 19% to close around $2.1 trillion on its first day SpaceX sheds 35% from post-IPO intraday peak one ...SpaceX stock gains 20% in first full day of trading, even though excitement quickly faded OpenAI Leans Toward Holding Up I.P.O. Until Next Year. Assuming the $1.4 trillion private round closes and serves as a pricing floor, similar first-day retail exuberance combined with robust compounding growth pushes our 75th percentile to $2.25 trillion. Set against related conditional valuations, a 20% probability of a high-value breakthrough model scenario , alongside the expected first-day retail pop, supports a 90th percentile of $2.8 trillion.