The Dow Jones industrial average fell a fraction to close at 14,865 Friday. In the first four days of the week the Dow rose 300 points.
The Standard & Poor's 500 index fell four points to 1,588. The Nasdaq composite lost five points to 3,294.
All three indexes still ended the week higher.
Oil companies fell after crude dropped $2 to $91 a barrel. OPEC, the International Energy Agency and the U.S. have cut their estimates for oil demand this year.
Three stocks fell for every two that rose on the New York Stock Exchange. Volume was light at 3.2 billion shares.