U.S. stocks pared losses heading into final hour of trading Tuesday to cap off a volatile session that has seen the the Dow Jones Industrial Average swing approximately 400 points from peak to trough. The Nasdaq Composite /zigman2/quotes/210598365/realtime COMP -0.52% was down 64 points, or 0.6%, at 11,566, while the S&P 500 /zigman2/quotes/210599714/realtime SPX -0.03% was down 10 points, or 0.3%, at 3,912. The Dow /zigman2/quotes/210598065/realtime DJIA +0.45% was down 150 points, or 0.5%, at 31,170. Only four of 11 S&P 500 sectors were trading in the green: Health-care, industrials, real-estate and utilities. Meanwhile, the communications services sector, a collection of technology, media and telecommunications stocks, was the worst performer, with the Communications Services Select Sector SPDR exchange-traded fund /zigman2/quotes/204079482/composite XLC -0.55% down 1.1%. Market strategists blamed surging Treasury yields for the underperformance in technology stocks as the Nasdaq Composite was on track for a seventh day in the red --- what would be its longest losing streak since November 2016. Meanwhile, the Russell 2000 index /zigman2/quotes/210598147/delayed RUT +0.30% of small-cap stocks was down 16 points, or 0.9%, at 1,793, headed for a seventh day in the red, what would be its longest losing streak since December 2018.