Marvell Technology and Flex to Join S&P 500 on June 22, Replacing Campbell's and Pool Corp

S&P Dow Jones Indices announced on June 5, 2026, that Marvell Technology and Flex will join the S&P 500 effective at the market open on June 22, replacing The Campbell's Company and Pool Corp. The changes are part of the index's quarterly rebalancing.

Marvell Technology's inclusion reflects its significant market capitalization, which far exceeds the $22 billion threshold required for S&P 500 eligibility. The company has benefited from strong demand for chips used in AI infrastructure, particularly custom silicon for hyperscale data centers. Shares of Marvell rose approximately 6 percent in extended trading following the announcement.

Flex, a contract manufacturer for electronics, is being promoted from the S&P MidCap 400 to the S&P 500. The company manufactures products for a wide range of industries, including technology, healthcare, and automotive.

Campbell's Company and Pool Corp are being removed from the index. Campbell's, the soup and snack food company, has faced declining sales as consumer preferences shift. Pool Corp, a distributor of swimming pool supplies, has seen its business slow as the pandemic-era home improvement boom fades.

Index inclusion typically drives significant buying activity from passive funds and ETFs that track the S&P 500, which can push share prices higher in the days leading up to the effective date.

The rebalancing reflects the broader shift in the U.S. economy toward technology and AI-related businesses. Marvell's addition to the S&P 500 follows a period of rapid growth driven by contracts with major cloud providers to design custom AI chips, a market that has expanded dramatically as companies race to build AI infrastructure.

Analysts say Marvell's inclusion in the index will increase its visibility among institutional investors and could attract additional capital to the stock over time.