NEW YORK (Reuters) -Major U.S. stock indexes declined sharply on Thursday with investors concerned about the impact President Donald Trump's trade policy may have on companies and the broader economy, while Marvell Technology's revenue forecast sparked concerns about spending on artificial intelligence infrastructure. The Nasdaq Composite ended down 10.4% from its record high close on December 16, confirming the tech-heavy index has been in a correction since peaking several months ago. Below are investor comments about the selloff, which also saw the S&P 500 dip below its 200-day moving average for the first time since November 1, 2023.