**Trader consensus on the OpenAI IPO closing market cap heavily favors no listing by year-end 2026, reflecting executive guidance and the extended regulatory timeline.** OpenAI executives, including President Greg Brockman and CFO Sarah Friar, have explicitly targeted readiness for a 2027 IPO following the confidential S-1 filing in June 2026, citing priorities around AI safety validation, enterprise revenue scaling, and capital markets conditions. The company’s recent $11–15 billion private funding tranche at a $1.25 trillion pre-money valuation provides substantial runway without immediate public-market pressure. With rival Anthropic advancing toward a potential late-2026 debut, OpenAI’s deliberate pacing underscores the multi-month process required for full SEC review, roadshows, and pricing. While strong Q3 revenue growth and enterprise momentum could theoretically accelerate plans, the compressed window to December 31 leaves little room for such a shift absent unforeseen catalysts.