The S&P 500 Index posted its third consecutive year of gains of at least 15% in 2025, driven largely by specific sectors that performed well - particularly those related to artificial intelligence and hyperscale data centers, according to an analysis by visualcapitalist.com. It tracks the performance of US stocks over the past 12 months, including data from January 5, 2026, based on figures provided by finviz.com. • Google - the year's biggest individual gainer In 2025, Google (Alphabet) was