SpaceX and OpenAI Target Historic 2026 IPOs Amid Valuation Warnings

SpaceX and OpenAI are reportedly positioning themselves for public market debuts in 2026, potentially setting records for the largest initial public offerings in U.S. history by initial market value. While the prospect of owning shares in these AI and aerospace giants is generating significant interest, analysts warn that extreme valuations may lead to early investor losses. SpaceX, which recently merged with xAI to reach a valuation of $1.25 trillion, is on track to list shares in the third quarter of 2026. The company reported $18 billion in revenue for 2025 but faced a $5 billion loss, resulting in a steep price-to-sales (PS) ratio of 69. OpenAI is eyeing a fourth-quarter 2026 debut with a post-money valuation of $852 billion. Despite a 225% surge in 2025 sales to $13 billion and expectations that revenue will more than double in 2026, the company does not anticipate profitability until 2030. Its current PS multiple stands at 65. For context, only Palantir Technologies currently trades at a higher PS ratio (75) within the S&P 500. This puts both SpaceX and OpenAI in a valuation bracket that has historically been risky for day-one investors. Data from the University of Florida indicates that the 10 largest U.S. IPOs experienced a median decline of 11% within three months and a median drop of 26% within their first year of trading. Given the unprecedented scale of these two upcoming listings, market participants should be wary of the potential for swift reversals following the initial trading surge.