Thursday's trading session has presented significant movements among stocks, particularly within the mega-cap and large-cap segments. Market participants have witnessed notable declines in heavyweight stocks like UnitedHealth Group (UNH) and Tesla Motors (NASDAQ:TSLA),

U.S. stock markets experienced a downturn on Thursday, with the Nasdaq Composite shedding over 170 points and ending the day at 19,338.29.

U.S. stock indexes drifted lower Thursday following a mixed set of earnings reports from Morgan Stanley, UnitedHealth Group and other big companies. The S&P 500 slipped 0.2% after flipping between small gains and losses through the day.

S&P 500 slides 0.6% as Palantir drops 4% and Moderna tumbles 23%. Rising Treasury yields and upcoming CPI data keep traders on edge.

U.S. stocks erased a modest early gain, with the S&P 500 struggling to tally a fourth-straight advance. The index was marginally lower in recent trading, although it was outperforming both the Nasdaq Composite and the Dow.

NEW YORK — U.S. stock indexes drifted lower Thursday following a mixed set of earnings reports from Morgan Stanley, UnitedHealth Group and other big companies.