S&P Dow Jones Indices announced that AI infrastructure concept stock Marvell Technology (MRVL.US) and electronics manufacturing services giant Flex Ltd. (FLEX.US) will be officially added to the S&P 500 Index before the market opens tomorrow (June 22). The two will replace Pool Corp. (POOL.US), a pool equipment manufacturer, and Campbell Soup Company (CPB.US). The adjustment is part of S&P Dow Jones Indices’ latest quarterly routine index review. Changes to index constituents typically lead to passive funds concentrating purchases in the short term for the stocks being added. Market participants will focus on how the two shares perform at tomorrow’s open.