U.S. markets open lower.

U.S. stocks pulled back from a six-week high, though major indexes pared losses as Amazon and Netflix led gains in big technology shares. Oil plunged in New York and the dollar gained.

The S&P 500 cut a drop of nearly 2% by three-quarters. The Nasdaq indexes turned positive, with chipmakers joining in on gains among the bigger names. Chevron and Exxon weighed on the Dow Jones Industrial Average, as West Texas oil futures expiring Tuesday plunged, primarily because the May contract end forces physical receipt at a time when storage capacity is low. June prices fell below $23 a barrel, more than double the May one.