The S&P 500 index is set to welcome chipmaker Marvell Technology and electronics manufacturer Flex Ltd, a move that will further increase the weighting of the information technology sector within the benchmark.
Index operator S&P Dow Jones Indices announced the changes after the market closed last Friday. Following the news, shares of Marvell rose 6% in after-hours trading, while Flex gained 4%. The adjustments will take effect at the start of trading on Monday, June 22, at which time Campbell's and Pool Corp will be removed from the index.
Inclusion in the S&P 500 means the stocks of these companies will reach a broader investor base, including passive funds that track the index and actively managed funds with investment restrictions. This milestone carries significant implications for the stock liquidity and valuation of the involved firms.
Marvell's Inclusion Seen as Inevitable
Marvell's selection is widely viewed as a natural progression. The company's market capitalization has climbed to $230 billion, far exceeding the S&P 500's minimum market cap requirement of $22 billion and also well above that of other competitive candidates, such as clean energy firm Bloom Energy, which has a market cap of approximately $7.5 billion.
As noted by Stephens analyst Melissa Roberts, Marvell's average market cap over the past year has consistently remained above $50 billion, strongly indicating that its valuation growth is not a short-term phenomenon.
Additionally, while social media company Reddit, with a market cap of around $33 billion, was also considered a potential candidate, it ultimately was not selected.
Strengthening the Tech Sector and Anticipating IPOs
Flex, a manufacturer deeply involved in the data center market, already held significant weight in the S&P MidCap 400 index, making its promotion to the large-cap index largely anticipated.
The broader context is that information technology companies hold a lower overall weighting in the S&P 500 compared to their representation in the broader S&P Total Market Index.
With expectations rising for initial public offerings from giants like SpaceX, Anthropic, and OpenAI, there was external speculation that the index committee might preemptively add more tech companies to address this gap.
However, these tech giants remain ineligible for the S&P 500 in the near term. S&P Dow Jones Indices announced last Thursday that it would maintain its current inclusion policy and not revise the relevant rules. Had the rules been changed, companies like SpaceX could have applied for inclusion six months after going public and been exempt from profitability requirements.
The current rules require a company to be public for one year and meet profitability criteria. SpaceX recorded a substantial net loss last year.
Quarterly Rebalancing and Committee Discretion
The S&P 500 index undergoes a quarterly review to assess potential changes to its constituents. Not every review results in adjustments—for instance, the index committee made no replacements during the same period last year.
Beyond the market capitalization threshold, candidate companies must also meet hard criteria such as free float and profitability.
Once a company satisfies these objective requirements, the index committee retains a degree of subjective discretion, allowing it to make a final decision by considering factors like sector weighting. Furthermore, S&P Dow Jones Indices may also make unscheduled adjustments, such as when an existing constituent is acquired.
Comments