FTSE Russell Speeds IPO Index Entry Ahead Of SpaceX's $75 Billion Debut

FTSE Russell (LSEG) has shortened the waiting period for mega-cap IPOs to enter its main indexes, allowing firms with investable market capitalizations above the Russell Top 500 cutoff to qualify after five trading days instead of waiting for quarterly reviews. The change, announced May 2026 ahead of SpaceX’s anticipated $75 billion IPO, aligns FTSE Russell with moves by other index providers (Nasdaq cut its inclusion period to 15 days). The faster inclusion could trigger sizeable passive-fund buying if a large IPO is added to benchmarked indexes, potentially amplifying early volatility and reshaping passive flows across the roughly $30+ trillion of assets tied to index rules. The article frames the development as a market-structure shift with material implications for index-tracking funds and IPO price discovery.