Check out the companies making the biggest moves before the bell: Confluent – The Wall Street Journal published a report on Sunday that IBM is in advanced talks to seal an $11 billion deal to acquire data-infrastructure company Confluent, boosting the latter company’s shares by 27%. Broadcom — The chipmaker rose more than 2% after The Information reported Microsoft was in talks of moving its custom chips business to Broadcom from Marvell Technology . Shares of Marvell shed 6%. Lumentum Holdings — The optical and photonic product manufacturer’s stock added 4% after it announced an extension of its strategic agreement with IQE, a British semiconductor company. Carvana , CRH — Ireland-based manufacturer CRH and automobile e-commerce platform Carvana will join the S & P 500, S & P Dow Jones Indices announced Friday. The changes will be reflected prior to the open of Dec. 22. CRH gained 7%, while Carvana rose nearly 9%. Berkshire Hathaway — Warren Buffett’s conglomerate…