(Reuters) - U.S. stock index futures were mixed in muted trading on Monday as investors awaited fresh economic data and comments from Federal Reserve officials for more clarity on monetary policy.

S&P 500 futures retreated slightly after hitting multiple record highs in the previous week, while the tech-heavy Nasdaq inched up as megacap stocks including Apple, Microsoft and Nvidia rose between 0.2% and 0.6%.

The blue-chip Dow was the only one of the three major indexes to post weekly declines on Friday, while the Nasdaq notched its fifth consecutive record closing high and posted gains of 3.2% for the week.

Some investors, however, have been concerned about the sustainability of the equity rally as megacap growth and technology stocks were behind most of Wall Street's gains this year.

Goldman Sachs still raised its 2024 year-end target for the S&P 500 Index to 5,600 from 5,200 earlier, representing about a 3.1% upside to the index's last close.