Marvell Technology (MRVL) and Flex (FLEX) will join the S&P 500 index, replacing Pool Corp. (POOL) and Campbell’s (CPB), S&P Dow Jones Indices announced late Friday. Roku (ROKU) will join the S&P MidCap 400. Marvell, Flex and Roku all rose after Friday’s close. The changes, part of a quarterly rebalancing of S&P indexes, will take place before the open on…
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