At the 4:00 PM ET close on July 6, fund managers tracking the Nasdaq-100 bought an estimated $4.3 billion of SpaceX shares. Nobody who owns those funds in a 401(k), an IRA or a brokerage account was asked. The next morning, July 7, SpaceX (Nasdaq: SPCX) became a Nasdaq-100 member, the fastest any company has joined a major US benchmark, and every fund pegged to the index carries a position of roughly 0.5% to 0.7%.
The cause is a rule Nasdaq adopted on May 1, 2026, about six weeks before SpaceX’s June 12 IPO. Critics from Acadian Asset Management to the American Federation of Teachers have called it one of the biggest shifts in index design in a generation.
What the rule says
The old Nasdaq-100 methodology made new listings wait at least three months and keep at least 10% of their shares in public hands. Both conditions are gone for the largest newcomers. Any company whose full market capitalization would rank within the top 40 current members now qualifies after 15 trading days, with as little as five days of notice to the market.
Nasdaq said in a February 2026 consultation document that companies now stay private longer and list “at larger scale” with “more complex ownership and share structures.” Owen Lamont, a senior vice president at Acadian, was blunter: “Bad idea — that’s too short for price discovery to occur.”
Others piled on. George Noble, chief investment officer of a hedge fund, told Kiplinger: “This is the most shameless structural manipulation of a major index I’ve ever seen.” Wall Street Journal columnist Jason Zweig called the rule “arbitrary, unfair and potentially risky,” and the Financial Times’ Robin Wigglesworth suggested the pairing with a mega-IPO could be “the biggest bagholder exercise of all time.”
Emily Spurling, Global Head of Index at Nasdaq Global Indexes, defended the change in a May 8 Q&A. She said the old three-month wait was built for “traditional IPOs”, not for companies that arrive with “institutional-scale investor bases before their first day of trading”, and that a float-based weight cap answers the critics.
Who gains
Three parties come out ahead, on the critics’ reading. The company raises more: research cited by Kiplinger puts the extra at roughly 6%. Its pre-IPO investors get guaranteed buying pressure. Nasdaq gets trading fees from a busier index and a marquee listing. The pension saver and the 401(k) holder pay whatever price the market had reached before the mechanical buying started.
Announced index changes also invite front-running, as algorithmic traders and momentum funds buy the candidate ahead of the rebalancing date. A 15-day window with five days of notice makes that window short and easy to aim at.
The price record fits the worry. SpaceX priced at $135 and raised roughly $85.7 billion, the largest IPO ever and nearly three times Saudi Aramco’s 2019 record. The shares peaked at $225.64 on June 16, then dropped to $147.11 on June 23, a 35% fall. They traded around $162 by the Friday before the rebalance. The inclusion announcement came on June 26. Funds bought about 28% below the peak and 20% above the IPO price.
Only 3% to 5% of SpaceX shares trade publicly. For companies with under 33.3% of shares in public hands, Nasdaq’s method applies a multiplier of up to three times the prevailing float ratio, which roughly triples the demand funds must meet compared with what the thin float would suggest.
The S&P 500 held out
About $6 trillion is benchmarked to the S&P 500, including SPY, Vanguard’s VOO and iShares’ IVV. Those funds were not forced to buy. S&P Dow Jones Indices announced on June 4, after a consultation that ran through May, that it would keep its 12-month seasoning period, its four consecutive quarters of positive GAAP earnings and its minimum 10% public float. FTSE Russell, by contrast, moved to a five-day window.
SpaceX reported a $4.28 billion GAAP net loss in the first quarter of 2026, after a $4.94 billion loss in 2025 on $18.67 billion in revenue. Under S&P’s rules it cannot be considered before mid-2027.
At $1.75 trillion, the market capitalization is above 90 times trailing sales. The AI unit, absorbed through a February 2026 all-stock merger with xAI, lost $6.36 billion at the operating level in 2025 and burned another $2.5 billion in the first quarter of 2026. Morningstar calls the stock “demanding” and points to a “material threat of value destruction” at xAI. New Street Research and Oppenheimer are more upbeat, with price targets of $165 and $190.
What history suggests
Of 35 Nasdaq-100 additions since the start of 2022 that were announced at least 10 days ahead, only 12 rose on their first day as members. The average first-day change was a loss of 1.13%, and the five-day average was a loss of 3.41%, according to data published on Seeking Alpha. Strategy, formerly MicroStrategy, joined in December 2024 after a 358% run that year and was down 68% by the end of 2025.
The next date to watch is August 6. SpaceX is due to report its first quarterly earnings as a public company, and the first insider lockup window opens, freeing roughly 20% of locked shares for sale. A further 10% could unlock if the stock trades at least 30% above its $135 IPO price on five of any ten consecutive trading days.
