Marvell Technology , a chipmaker that makes several different parts and products needed for the artificial intelligence infrastructure boom, is joining the S&P 500 on June 22, becoming the latest semiconductor company to be added to the benchmark. Flex , a contract manufacturer for electronics, will also be added to the index on June 22, according to a press release. The two companies will replace Pool Corp and The Campbell's Company . Marvell stock rose 5% in extended trading. The chipmaker