SpaceX’s debut last week sparked a rush among investors, with shares climbing after the launch of its IPO. A wave of retail and institutional buyers rushed in, hoping to stake a claim in the rocket‑maker’s future. The surge set the stage for a new debate on how quickly mega‑IPOs should enter benchmarks.

Index providers like Nasdaq and FTSE Russell have begun adding the company to major benchmarks after as little as five days of trading, cutting the customary seasoning period that can stretch to a year. This acceleration exposes passive funds to an untested business model before long‑term fundamentals settle.

Acadian Asset Management’s Owen Lamont argues that owning a slice of SpaceX shouldn’t unsettle true passive investors, who typically ignore individual company volatility. Yet he warns the rapid inclusion could signal an overvalued market and may not enhance returns compared to broader indices.

For fund managers, the move compels a reassessment of benchmark composition and risk exposure. Investors will need to monitor how early‑listed mega‑IPOs perform once the initial hype fades, as the true test of their value arrives only after a full year of trading.