Dow Jones opened down 31.20 points (-0.06%) at 51,971.21 on Monday, Oct. 19; S&P 500 opened up 43.09 points (+0.56%) at 7,702.53; Nasdaq Composite opened up 267.06 points (+1.02%) at 26,407.10.

Monday morning Gulf stocks were subdued after a tanker explosion in the Strait of Hormuz and continued uncertainty over when the shipping lane will reopen. Saudi Arabia’s TASI fell 0.3%, weighed by a 1.7% drop in a major mining stock and a 0.8% decline in Saudi National Bank. Dubai’s DFMGI was flat. Abu Dhabi’s FTFADGI slipped 0.2%. Qatar’s QSI fell 0.5% to its lowest level in more than six years.

US 6-month Treasury auction stop-out yield 4.22% on Oct. 19; prior 4.20%.