SpaceX slips despite Nasdaq 100 inclusion and index-fund buying

SpaceX shares fell in premarket trading on Tuesday, extending a weeks-long decline even as the company entered the Nasdaq 100, according to The New York Times’ DealBook. The move into the index triggered automatic purchases by funds that track the benchmark, but the buying pressure has not translated into a sustained lift for the stock.

The company, led by Elon Musk and described by DealBook as a rocket and artificial intelligence business, made its trading debut last month. Since then, its share price has languished, surprising some market watchers given the attention the listing has drawn from Wall Street, according to the report.

SpaceX’s admission to the Nasdaq 100 took effect on Tuesday and was made possible by a new fast-track rule, DealBook reported. The Nasdaq 100 is a widely followed index of large technology and growth-oriented companies listed on Nasdaq. Inclusion can matter because many exchange-traded funds and mutual funds seek to mirror the index rather than select individual securities.

That structure creates mechanical demand. When an index provider adds a company, funds designed to replicate that index generally buy the new constituent’s shares and adjust their portfolios so that holdings match the benchmark. DealBook described this as a form of automatic buying by index funds.

For newly added companies, that demand can support the share price, at least around the date of inclusion, because index-tracking vehicles must acquire stock regardless of their own view of valuation or business prospects. DealBook noted that companies often see their shares rise when they become part of a major index for that reason.

SpaceX’s initial market performance has diverged from that pattern. The stock’s continued weakness suggests that index-related demand has so far been outweighed by other selling pressure or investor caution, although the DealBook report did not attribute the decline to a specific cause.

The company’s inclusion also highlights the scale of passive investment in U.S. equities. Index funds can influence trading flows because their mandates are tied to benchmark composition, and a change in an index can require buying or selling that is unrelated to company news. In SpaceX’s case, the expected index effect has not been enough to reverse the post-debut slump reported by DealBook.

The episode leaves investors weighing a familiar distinction: index membership can create near-term demand for shares, but it does not determine how the market prices a company after trading begins. For SpaceX, the Nasdaq 100 milestone has arrived alongside continued pressure on the stock rather than the immediate boost some market participants expected.

This story draws on original reporting from NYT DealBook.