⚓ How Might Mega-Cap IPOs Affect Markets?
J.P. Morgan Asset Management examines how a wave of mega-cap IPOs could reshape stock indices, noting there are now over 800 venture-backed private companies valued above $1 billion, with some nearing $1 trillion valuations. Because IPOs typically float only a small share of total stock (with lockups often lasting 6+ months), a trillion-dollar listing isn't a trillion-dollar market event on day one. Index providers are adapting differently: Nasdaq 100 and Russell 1000 plan to fast-track inclusion of mega-caps within weeks or months, while the S&P 500 keeps its 12-month seasoning and profitability requirements. The average IPO this decade pops 32% on day one but is down 26% a year later, and the piece warns of potential short-term rebalancing volatility as index weights adjust to growing free float.
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