Marvell Technology Set to Join S&P 500, Impacting Market Dynamics

By Patricia Miller

Jun 21, 2026

2 min read

Marvell Technology is joining the S&P 500, replacing Campbell's, which moves to the SmallCap 600. This shift impacts market dynamics.

S&P Dow Jones Indices announced that Marvell Technology will enter the S&P 500 effective before markets open on June 22. This change will replace Campbell’s Soup Company, which will drop down to the S&P SmallCap 600. Following this announcement, Marvell’s shares surged approximately 5% in after-hours trading, signaling positive market sentiment around the inclusion.

#What Changes Are Happening in the Index?

The quarterly rebalancing is not limited to this single move. Flex Ltd., another company in the Information Technology sector, will also join the S&P 500 alongside Marvell. Pool Corporation will exit along with Campbell’s, and both companies will transition to the S&P SmallCap 600 due to their market capitalizations not meeting the requirements for the large-cap index.

#Why Does Index Inclusion Matter for Investors?

The significance of being included in the S&P 500 is substantial. The index is a benchmark for trillions of dollars in index funds and exchange-traded funds (ETFs). When a stock is added to this index, it necessitates that these funds purchase shares to maintain accurate tracking. This creates a strong demand that can elevate share prices, independent of the company's specific financial health at that moment. Conversely, shares of Campbell’s and Pool Corp. may face downward pressure due to the mandated selling by these same passive investment vehicles.

#What Does This Mean for Technology Stocks?

The addition of Marvell and Flex emphasizes the ongoing strength of the technology sector, which already holds a dominant weight in the index. Marvell’s inclusion is particularly indicative of the market's increasing interest in entities involved in artificial intelligence infrastructure. Data center expansions by leading cloud providers have significantly boosted the need for custom semiconductors and high-speed networking solutions, aligning perfectly with Marvell’s offerings.

#How Should Investors React to These Changes?

For investors holding broad market index funds, this transition will be executed automatically by fund managers. Your S&P 500 ETF will liquidate positions in Campbell’s and Pool Corp., subsequently acquiring shares of Marvell and Flex without any action required on your part.

For those participating in active investment trading, it is important to note that following an index inclusion announcement up to the effective date, the stocks in question typically experience a spike in trading volume and price appreciation. Therefore, by the time June 22 arrives for the passive funds to execute their trades, much of the anticipated price movement may already be integrated into the stock prices.

Important Notice And Disclaimer

This article does not provide any financial advice and is not a recommendation to deal in any securities or product. Investments may fall in value and an investor may lose some or all of their investment. Past performance is not an indicator of future performance.