SpaceX Just Joined the Nasdaq-100. Should You Worry About Your Index Fund?

Key points

• SpaceX joined the Nasdaq-100 on July 7th, 2026, forcing index funds that track it to automatically buy shares.
• The Nasdaq changed its own rules, at SpaceX's request, to allow newly public companies to join the index after just 15 days of trading.
• SpaceX holds a market cap above $1.5 trillion, but because less than 5 percent of shares were sold publicly, it's treated as a much smaller company inside the index.
• Economist Burton Malkiel, a founding thinker behind index investing, says SpaceX is not a reason to avoid index funds.
• Larger share releases are expected in mid-August 2026 and could shift SpaceX's weight inside these funds.

Most people who own index funds don't pick the companies inside them. That's the whole point. An index fund, a type of investment that automatically buys a slice of every company in a given list, follows the market without requiring you to guess which stocks will win.

So when SpaceX landed inside the Nasdaq-100, a list of the hundred largest non-financial companies on the Nasdaq stock exchange, a lot of savers suddenly owned a piece of it whether they wanted to or not.

Short version: it probably doesn't put your retirement at serious risk. But the mechanics are worth understanding, and our earlier report on SpaceX shares slipping below their IPO price shows the stock's volatility is already real.

Index funds got popular largely because of a 1973 book called A Random Walk Down Wall Street by economist Burton Malkiel. His core argument: nobody, not even professionals, can reliably predict which individual stocks will beat the market over the long run. Warren Buffett has made the same point, suggesting ordinary investors put 90 percent of their money into a low-cost S&P 500 fund, a list of America's 500 largest public companies. By 2024, money in passive funds like these outpaced money in actively managed funds for the first time.

SpaceX's entry raised two concerns.

First, the Nasdaq quietly changed its rules so that a large enough company can join the Nasdaq-100 just 15 days after going public. Reuters reported that SpaceX requested that rule change. Critics called it queue-jumping.

Second, Musk controls SpaceX almost entirely on his own. Shareholders in most public companies can vote on proposals and, in extreme cases, sue. SpaceX has sharply restricted both rights. The CEO of CalPERS, California's giant public pension fund, and New York's state and city comptrollers all wrote to SpaceX complaining about its governance structure. Ordinary index-fund holders can't vote at all, but the big fund managers who hold shares on their behalf can, and they now hold SpaceX in quantity.

Will this hurt my savings?

Probably not, but there's a genuine watch-out. SpaceX entered the index at a modest weight because the IPO sold less than 5 percent of the company's shares. That changes in mid-August, when employees barred from selling at launch, under what are called lockup periods, can start selling. More shares on the market typically means the company takes up more weight in the index, though selling can also push the price down. The Wall Street Journal has noted that index funds are likely to absorb some of that selling pressure, cushioning the price.

Malkiel's view, reported by The Verge AI, is direct: SpaceX is tremendously overhyped, but that's not an argument against index funds. Markets have overhyped every new technology from railroads to the internet. The funds still delivered long-run returns because a small number of genuine winners carried everything else. "A very small minority of stocks are responsible for the whole return, and experts can't pick them any better than the index as a whole," he told The Verge AI.

Anthropus and OpenAI are both expected to go public later this year. OpenAI's path already looks complicated: as we reported, a trade secrets lawsuit from Apple landed just as it's trying to reach the market. If AI turns out to be a bubble, that concentration could sting. Malkiel's counter is that the market has always been concentrated at the top, and the index still works over time.

The practical answer for now: check how much of your fund tracks the Nasdaq-100 versus a broader index like the S&P 500 or a total-market fund. Broader baskets spread the risk further. Not a panic move. Just good maintenance.