The S&P 500 index has achieved its best first quarter performance since 2019, with gains of 10% without dividends and 10.56% with dividends. This marks the first back-to-back double-digit quarterly percentage gains in 12 years. The Dow Jones Industrial Average also closed at a record high. The stock market posted its biggest Q1 gain in five years, with both the S&P 500 and Dow Jones indexes closing at records.