SpaceX's latest price is about $192.50, with the previous trading day's closing price at about $161.01, representing a single-day gain of about 19.6%. SpaceX's IPO issue price was $135, corresponding to a valuation of about $1.77 trillion. Based on this, the total number of shares is estimated to be about 13.11 billion. So, from $161.01 to $192.50, the increase in the U.S. stock market capitalization is approximately:

$31.49 × 13.11 billion shares ≈ $412.9 billion.

Meanwhile, the Forbes real-time rich list shows that Warren Buffett's net worth as of June 15, 2026, is about $146.6 billion. Therefore, the one-day increase in SpaceX's market value is roughly equivalent to:

$412.9 billion ÷ $146.6 billion ≈ 2.8 Buffetts.