U.S. Equities Mega IPOs: What's next for markets and investors?

SpaceX kicked off its initial public offering ahead of pending listings from high-profile AI firms Anthropic and OpenAI, among others. How should investors approach these deals, especially in the context of index inclusion, market concentration and portfolio construction?

 

Zooming out on some of the largest U.S.-listed tech IPOs since 2004 shows that after the initial first-day return, many struggled in the weeks that followed. This reflects a period of price discovery, as some investors take profits while others build positions. Over time, however, shares tend to track earnings potential and better reflect the value of the underlying business.

High profile tech listings tend to be volatile in the short term

A line chart shows cumulative price returns during the first two years following the IPO or direct listing for several technology companies (Palantir, Google/Alphabet, Snowflake, Uber, Tesla, Arm Holdings and Facebook/Meta), with outcomes ranging from early gains to significant declines. Results vary widely over this period, with some companies falling sharply before stabilizing and others rising more steadily. A table alongside the chart shows that longer-term outcomes differ significantly, with lifetime annualized returns ranging from roughly 1 percent to nearly 100 percent.

Sources: Capital Group, FactSet, company filings. Data shown represent cumulative price returns from the opening price on each company’s first day of trading over the first two years following its IPO or direct listing. Companies shown are selected examples of widely followed technology listings since the early 2000s, included to illustrate a range of industries, listing types and post-listing outcomes. Returns are shown for illustrative purposes only. Major lockup expirations shown reflect initial or significant subsequent expiration dates for insider share sale restrictions following each listing, based on company filings and publicly reported lockup schedules. Lifetime annualized returns are calculated from each company’s first day of trading: Google (now Alphabet, August 19, 2004), Tesla (September 29, 2010), Facebook (now Meta Platforms, May 18, 2012), Uber (May 10, 2019), Snowflake (September 16, 2020), Palantir (September 30, 2020) and Arm Holdings (September 14, 2023), all through May 31, 2026. Returns are based on Class A shares where applicable. Price returns exclude the reinvestment of dividends and capital distributions. Past results are not predictive of results in future periods.

What makes this current wave of mega IPOs unique is that some index providers have altered their inclusion rules to accommodate large IPOs to join more quickly, such as Nasdaq and Russell 1000.

 

Near-term, we expect SpaceX’s index inclusion will generate some sustained buying interest in the days following the company’s addition. At the same time, some existing index constituents may face modest selling pressure to create room for a new entrant. These effects are likely to be relatively mild and short-lived.

 

Evaluating a vast range of IPOs relies on thorough research that assesses the long-term fundamental case for a stock affecting various industries. That framework does not change because an index does.

 

The AI boom has generated widespread retail and institutional interest, which is expected to increase further as large IPOs come to market. At the same time, companies have experienced rapid valuation gains, bringing market concentration into sharper focus. While the long-term earnings trajectory remains uncertain, periods of valuation adjustment and volatility are a natural part of aligning expectations with realized outcomes.

 

AI can support long-term return potential and represent a credible allocation within portfolios. However, exposure should be balanced, with no single theme dominating overall risk.

 

Recent dispersion within the Magnificent Seven highlights this dynamic. Despite strong interest in AI, stock performance has diverged this year, reinforcing the need for selective exposure, particularly as new IPOs come to market.

David Polak is an investment director with 42 years of investment industry experience (as of 12/31/2025). He holds a bachelor’s degree in economics from University College London.

Marc E. Nabi is an equity investment director and portfolio strategy manager with 37 years of investment industry experience (as of 12/31/2025). He holds an MBA in finance from New York University and a bachelor’s degree in accounting from the University of Michigan.

The Magnificent Seven stocks consist of Alphabet, Amazon, Apple, Meta, Microsoft, NVIDIA and Tesla.

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