SpaceX's June 2026 Nasdaq IPO under ticker SPCX triggered immediate inclusion in the Nasdaq-100 via fast-track rules, yet S&P Dow Jones Indices explicitly declined to relax its criteria for mega-cap listings. The 12-month seasoning period alone bars eligibility before June 2027, while GAAP profitability requirements remain unmet given ongoing net losses and a sub-10% public float. These barriers, reaffirmed in S&P's June 4 statement, underpin the 98.5% market-implied odds against 2026 addition. Tail risks include an unforeseen methodology overhaul or rapid profitability turnaround, though both face substantial institutional and regulatory hurdles that traders price as remote.