Flex is trading 4.3% up in pre-market at $135.02 as investors react to its recent inclusion in the S&P 500. - The company officially joined the S&P 500 on July 13, 2026, a significant milestone reflecting its rapid growth. - Traders are also continuing to reassess Flex's valuation and AI exposure in light of its planned Cloud and Power Infrastructure spin-off, announced earlier this year. - The stock saw a 4.3% decline on July 13, 2026, amidst a broader technology sector selloff.