US stocks close at record highs to end tumultuous 2020

A person with the 2021 sign in Times Square on December 21.
Alexi Rosenfeld/Getty ImagesUS stocks went out with a bang on Thursday, the last trading day of 2020.The Dow Jones industrial average and the S&P 500 both closed at record highs, while the tech-heavy Nasdaq had its best year since 2009, gaining 43% in 2020.Watch major indexes update live here.US stocks closed higher on Thursday to finish 2020.The Dow Jones industrial average and the S&P 500 both closed at record highs, while th